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llc current - resonant off - line switching controller SSC3S900 series data sheet SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 1 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 description the SSC3S900 series is a controller with smz* method for llc current resonant switch ing power supplies , incorporating a floating drive circuit for a high - side power mosfet. the product includes useful functions su ch as standby mode change, overload protection with input voltage compensation , automatic dead time adjustment, and capacitive mode detection. the product realizes high performance - to - cost power supply system, downsized by high efficiency and low noise. *s mz: s oft - switched m ulti - resonant z ero current switch, achieved soft switching operation during all switching periods features standby mode change function ? output power at light load: p o = 100 mw (p in = 0.27 w, as a reference with discharge resistor of 1m for across the line capacitor) ? burst operation in standby mode ? soft - on/soft - off function: reduces audible noise realizing power supply with universal mains input voltage floating drive circuit: drives a high - side power mosfet directly soft - start function capacitive mode detection function reset detection function automatic dead time adjustment function brown - in and brown - out f unction built - in startup circuit input electrolytic capacitor discharge function protection s ? high - side driver uvlo ? overcurrent protection (ocp): peak drain current detection, 2 - step detection ? overload protection (olp) with input voltage compensation ? overvoltage protection (ovp ) ? thermal shutdown (tsd) typical application package sop18 not to scale lineup product protection operation uvlo / ocp olp / ovp / tsd ssc3s901 auto restart auto restart ssc3s902 auto restart latch shutdown application switching power supplies for electronic devices such as: digital appliances: lcd television and so forth office automation (oa) equipment : server, multi - function printer, and so forth industrial apparatus communication facilities v a c v s p l v s e n v c c f b s t n c v g h v s v b n c r e g c s s c l p l v g l g n d r c s b s t a n d b y v o u t 2 g n d v o u t 1 t 1 p c 1 p c 2 p c 1 p c 2 1 1 5 1 6 1 7 1 8 4 3 2 u 1 s s c 3 s 9 0 0 7 6 5 1 2 1 3 1 4 9 8 1 0 1 1
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 2 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 contents description -------------------------------- -------------------------------- -------------------------------- ------ 1 contents -------------------------------- -------------------------------- -------------------------------- ---- 2 1. absolute maximum ratings -------------------------------- -------------------------------- ------------- 3 2. electrical characteristics -------------------------------- -------------------------------- ---------------- 4 3. block diagram -------------------------------- -------------------------------- ----------------------------- 7 4. pin configuration definitions -------------------------------- -------------------------------- ----------- 7 5. typical application -------------------------------- -------------------------------- ----------------------- 8 6. external dimensions -------------------------------- -------------------------------- ---------------------- 9 7. marking diagram -------------------------------- -------------------------------- ------------------------- 9 8. operational description -------------------------------- -------------------------------- --------------- 10 8.1 resonant circuit operation -------------------------------- -------------------------------- ----- 10 8.2 startup operation -------------------------------- -------------------------------- ----------------- 13 8.3 undervoltage lockout (uvlo) -------------------------------- -------------------------------- 13 8.4 bias assist function -------------------------------- -------------------------------- --------------- 13 8.5 soft start function -------------------------------- -------------------------------- ---------------- 14 8.6 minimum and maximum switc hing frequency setting -------------------------------- --- 14 8.7 high - side driver -------------------------------- -------------------------------- ------------------- 14 8.8 constant voltage control operation -------------------------------- -------------------------- 15 8.9 standby function -------------------------------- -------------------------------- ------------------ 15 8.9.1 standby mode changed by external signal -------------------------------- ----------- 16 8.9.2 burst oscillation operation -------------------------------- ------------------------------- 16 8.10 automatic dead time adjustment function -------------------------------- ---------------- 17 8.11 brown - in and brown - out function -------------------------------- --------------------------- 17 8.12 capacitive mode detection function -------------------------------- -------------------------- 18 8.13 input el ectrolytic capacitor discharge function -------------------------------- ----------- 19 8.14 reset detection function -------------------------------- -------------------------------- -------- 19 8.15 overvoltage protection (ovp) -------------------------------- -------------------------------- -- 21 8.16 overcurrent protection (ocp) -------------------------------- -------------------------------- - 21 8.17 overload protection (olp) with input voltage compensation -------------------------- 22 8.17.1 overload protection (olp) -------------------------------- -------------------------------- 22 8.17.2 olp input voltage compensation function -------------------------------- ----------- 24 8.18 thermal shutdown (tsd) -------------------------------- -------------------------------- ------- 25 9. design notes -------------------------------- -------------------------------- ------------------------------ 26 9.1 exter nal components -------------------------------- -------------------------------- ------------ 26 9.1.1 input and output electrolytic capacitors -------------------------------- ---------------- 26 9.1.2 resonant transformer -------------------------------- -------------------------------- ------ 26 9.1.3 current detection resistor, r ocp -------------------------------- -------------------------- 26 9.1.4 current r esonant capacitor, ci -------------------------------- --------------------------- 26 9.1.5 gate pin peripheral circuit -------------------------------- ------------------------------- 26 9.2 pcb trace layout and component placement -------------------------------- ------------- 26 10. pattern layout example -------------------------------- -------------------------------- --------------- 28 11. reference design of power supply -------------------------------- -------------------------------- -- 29 important notes -------------------------------- -------------------------------- --------------------- 32
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 3 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 1. absolute maximum ratings the polarity value for current specifies a sink as "+ , " and a source as "? , " referencing the ic. unless otherwise specified, t a is 25c characteristic symbol pins rating unit vsen pin sink current i sen 1 ? v cc 2 ? ? v fb 3 ? ? i spl 4 ? css 5 ? ? cl 6 ? ? rc 7 ? ? pl 8 ? ? sb 9 ? gl 11 ? ? reg +0.3 v reg pin source current i reg 12 ? ? b ? s 14 ? ? s 15 ? ? gh 16 ? s ? b +0.3 v st pin voltage v st 18 ? ? op ? ? stg ? ? j ?
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 4 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 2. electrical characteristics the polarity value for current specifies a sink as "+ , " and a source as "? , " referencing the ic. unless otherwise specified, t a is 25 c, v cc is 19 v characteristic symbol conditions pins min. typ. max. unit notes start circuit and circuit current operation start voltage v cc(on) 2 ? cc(off) 2 ? cc(bias) 2 ? cc(on) 2 ? ? ? 10.0 ma circuit current in non - operation i cc(off) v cc = 9v 2 ? cc(st) 2 ? ( 1 ) v cc(p.off) 2 ? ssc3s901 vcc pin latch protection circuit release threshold voltage ( 2 ) v cc ( l.off ) 2 ? ssc3s902 circuit current in protection i cc(p) v cc = 11v 2 ? ? oscillator minimum f requency f (min) 11 C ? (max) 11 C ? d(min) 11 C ? d(max) 11 C ? (min)adj r css = 30k 11 C ? feedback control fb p i n oscillation start threshold voltage v fb(on) 3 C fb(off) 3 C fb(max) v fb = 0v 3 C ? ? ? soft - start css pin charging current i css(c) 5 C ? ? ? css(r) v cc = 9v 5 C (max)ss 11 C ? standby sb pin standby threshold voltage v sb(stb) 9 C sb(on) 9 C ( 1 ) v cc ( p. off) = v cc(off) < v cc(bias) always. ( 2 ) v cc ( l. off) < v cc(off) < v cc(bias) always.
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 5 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 characteristic symbol conditions pins min. typ. max. unit notes sb pin oscillation stop threshold voltage v sb(off) 9 C 10 0.4 0.5 0.6 v sb pin clamp voltage v sb(clamp) 9 C 10 6.1 6.7 7.4 v sb pin source current i sb(src) 9 C 10 ? 20 ? 10 ? 4 a sb pin sink current i sb(snk) 9 C 10 4 10 20 a overload protection (olp) with input voltage compensation cl pin threshold voltage (1) v cl1 v spl = 1v 6 C 10 4.40 4.69 4.88 v cl pin threshold voltage (2) v cl2 v spl = 2v 6 C 10 3.05 3.43 3.65 v cl pin threshold voltage (3) v cl3 v spl = 4v 6 C 10 1.60 1.83 2.05 v cl pin threshold voltage (4) v cl4 v spl = 5v 6 C 10 1.05 1 . 29 1.55 v cl pin source current i cl 6 C 10 ? 29 ? 17 ? 5 a brown - in and brown - out vsen pin threshold voltage (on) v sen(on) 1 C 10 1.248 1.300 1.352 v vsen pin threshold voltage (off) v sen(off) 1 C 10 1.070 1.115 1.160 v vsen pin clamp voltage v sen (clamp) 1 C 10 10.0 C C v vspl pin clamp voltage v spl (clamp) 4 C 10 10.0 C C v reset detection maximum reset time t rst(max) 11 C 10 16 ? 15 4.0 5.0 6.0 s driver circuit power supply vreg pin output voltage v reg 12 C 10 9.6 10.4 11.2 v high - side driver high - side driver operation start voltage v buv(on) 14 C 15 6.3 7.3 8.3 v high - side driver operation stop voltage v buv(off) 14 C 15 5.5 6.4 7.2 v driver circuit vgl,vgh pin source current 1 i gl(src)1 i gh(src)1 v reg = 10.5v v b = 10.5v v gl = 0v v gh = 0v 11 C 10 16 ? 15 C C 540 C a vgl,vgh pin sink current 1 i gl(snk)1 i gh(snk)1 v reg = 10.5v v b = 10.5v v gl = 10.5v v gh = 10.5v 11 C 10 16 ? 15 C 1.50 C a vgl,vgh pin source current 2 i gl(src)2 i gh(src)2 v reg = 12v v b = 12v v gl = 10.5v v gh = 10.5v 11 C 10 16 ? 15 ? 140 ? 90 ? 40 ma vgl,vgh pin sink current 2 i gl(snk)2 i gh(snk)2 v reg = 12v v b = 12v v gl = 1.5v v gh = 1.5v 11 C 10 16 ? 15 140 250 360 ma current resonant and overcurrent protection(ocp) capacitive mode detection voltage 1 v rc1 7 C 10 0.02 0.10 0.18 v ? 0.18 ? 0.10 ? 0.02 v
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 6 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 characteristic symbol conditions pins min. typ. max. unit notes capacitive mode detection voltage 2 v rc2 7 C 10 0.35 0.50 0.65 v ? 0.65 ? 0.50 ? 0.35 v rc pin threshold voltage (low) v rc(l) 7 C 10 1.42 1.50 1.58 v ? 1.58 ? 1.50 ? 1.42 v rc pin threshold voltage (high speed) v rc(s) 7 C 10 2.15 2.30 2.45 v ? 2.45 ? 2.30 ? 2.15 v css pin sink current (low) i css(l) 5 C 10 1.2 1.8 2.4 ma css pin sink current (high speed) i css(s) 5 C 10 13.0 20.5 28.0 ma overvoltage protection (ovp) vcc pin ovp threshold voltage v cc(ovp) 2 C 10 29.5 32.0 34.5 v thermal shutdown (tsd) thermal shutdown temperature t j(tsd) ? 140 C C c thermal resistance junction to ambient thermal resistance j - a ? ? ? 95 c /w
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 7 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 3. block diagram 4. pin configuration definitions number name function 1 v sen t he mains input voltage detection signal input 2 v cc s upply voltage input for the ic, and over voltage protection (ovp) signal input 3 fb f eedback signal input for constant voltage control 4 vspl the input voltage detection signal input for olp input voltage compensation 5 c ss soft - start capacitor connection 6 cl olp input voltage compensation capacitor connection 7 rc resonant current detection signal input, and overcurrent protection (ocp) signal input 8 pl resonant current detection signal input for olp input voltage compensation 9 sb standby mode change signal input 10 gnd ground 11 vgl low - side gate drive output 12 r eg supply voltage output for gate drive circuit 13 (nc) ? 14 vb supply voltage input for high - side driver 15 vs floating ground for high - side driver 16 vgh high - side gate drive output 17 (nc) ? 18 st startup current input s t a r t u p s t a r t / s t o p / r e g / b i a s / o v p m a i n i n p u t s e n s e s t a n d b y c o n t r o l f b c o n t r o l f r e q . c o n t r o l d e a d t i m e u v l o l e v e l s h i f t o c d e t e c t o r d v / d t d e t e c t o r r c d e t e c t o r p l d e t e c t o r / o l p f r e q . m a x s o f t - s t a r t / o c / f m i n a d j v c c g n d s t 1 8 2 1 0 1 9 3 5 1 4 1 6 1 5 7 6 8 4 1 1 1 2 v c c g n d v s e n s b f b c s s v b v g h v s r e g v g l r c c l p l v s p l h i g h s i d e d r i v e r b d _ s s c 3 s 9 0 0 _ r 2 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 vcc fb vspl css cl rc pl sb st ( nc ) vgh vs vb ( nc ) reg vgl gnd vsen
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 8 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 5. typical application v s p l v s e n v c c f b s t n c v g h v s v b n c r e g c s s c l p l v g l g n d r c s b s t a n d b y v o u t 2 g n d v o u t 1 t 1 p c 1 p c 2 p c 1 p c 2 1 1 5 1 6 1 7 1 8 4 3 2 u 1 s s c 3 s 9 0 0 7 6 5 1 2 1 3 1 4 9 8 1 0 1 1 b r 1 c 1 r 2 r 3 r 4 c 4 c 5 r 5 c 6 c 7 c 8 r o c p r 6 r 7 r 8 r 1 r 1 0 r 1 1 r 1 2 r 1 3 r 1 4 r 1 5 r 1 6 r 1 7 q 1 q ( h ) q ( l ) c 2 c 3 c 9 c 1 0 c 1 1 c 1 2 d 1 d 3 d 4 d 5 d 6 c i c v d 5 1 d 5 2 d 5 3 d 5 4 c 5 1 c 5 2 c 5 3 c 5 4 c 5 5 r 5 1 r 5 2 r 5 3 r 5 4 r 5 6 r 5 5 r 5 7 r 5 8 r 5 9 q 5 1 v a c m a i n i n p u t r 1 5 r 1 6
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 9 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 6. external dimensions sop18 notes: dimension is in millimeters pb - free. device composition compliant with the rohs directive 7. marking diagram 1 1 8 p a r t n u m b e r s s c 3 s 9 0 x x x x s a n k e n c o n t r o l n u m b e r l o t n u m b e r y i s t h e l a s t d i g i t o f t h e y e a r ( 0 ~ 9 ) m i s t h e m o n t h ( 1 ~ 9 , o , n o r d ) d i s a p e r i o d o f d a y s ( 1 ~ 3 ) : 1 : 1 s t ~ 1 0 t h 2 : 1 1 t h ~ 2 0 t h 3 : 2 1 t h ~ 3 1 s t s k y m d
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 10 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 8. operational description all of the parameter values used in these descriptions are typical values, unless they are specified as minimum or maximum. with regard to current direction, "+" indicates sink current (toward the ic) and " C " indicates source current (from the ic). q (h) and q (l) indicate a high - side power mosfet and a low - side power mosfet respectively. ci, and c v indicate a current resonant capacitor and a voltage resonant capacitor respectively. 8.1 resonant circuit operation figure 8 - 1 shows a basic rlc s eries resonant circuit. figure 8 - 1 rlc series resonant circuit the impedance of the circuit, ? , is as the following equation . is angular frequency and = 2f . ? becomes minimum value (= r) at 2 fl = 1/2 fc, and then is calculated by equation ( 3 ) . ? becomes minimum value is the resonant frequency, f 0 . t he higher frequency area than f 0 is the inductance area, and the lower frequency area than f 0 is the capacitance area. f rom equation ( 3 ) , f 0 is as follows; (h) and q (l) are connected in series with v in . the series resonant circuit and the v oltage resonant capacitor c v are connected in parallel with q (l) . the series resonant circuit is comprised of a resonant inductor l r , a primary winding p of a transformer t1 and a curr ent resonant capacitor c i . in the resonant transformer t1, the coupling between primary winding and secondary winding is designed to be poor so that the leakage inductance increases. by using it as lr, the series resonant circuit can be down sized. the do tted mark in t1 shows the winding polarity, the secondary windings s1 and s2 are connected so that the polarities are set to the same position shown in figure 8 - 3 , and the winding numbers of each other are equal. from equation ( 1 ) , the impedance of current resonant power supply is calculated by equa tion ( 5 ) . from equation ( 4 ) , the resonant frequency, f 0 , is calculated by equation ( 6 ) . r : the inductance of the resonant inductor l p : the inductance of the primary winding p ci: the capacitance of current resonant capacitor figure 8 - 3 current resonant power supply circuit r l c f 0 f r e q u e n c y i n d u c t a n c e a r e a c a p a c i t a n c e a r e a i m p e d a n c e r c v c i l r q ( h ) p s e r i e s r e s o n a n t c i r c u i t t 1 s 1 s 2 v o u t ( + ) ( ? ) v i n v g h v g l q ( l ) v d s ( l ) v d s ( h ) v c i i d ( h ) i d ( l ) i c i i s 2 i s 1 l p
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 11 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 in the current resonant power supply, q (h) and q (l) are alternatively turned on and off. the on time and off time of them are equa l. there is a dead time between q (h) on period and q (l) on period . during the dead time, both q (h) and q (l) are in off status. the current resonant power supply is controlled by the frequency control. when the output voltage decreases , the ic makes the swi tching frequency low so that the output power is increased and the output voltage is kept constant. this control must operate in the inductance area ( f sw > f 0 ). since the winding current is delayed from the winding voltage in the inductance area, the turn - on operation is z cs (zero current switching) and the turn - off operation is zvs (zero voltage switching) . thus, the switching loss of q (h) and q (l) is nearly zero, in the capacitance area ( f sw < f 0 ), the current resonant power supply operat es as follows. when t he output voltage decreases, the switching frequency is decreased, and then the output power is more decreased. thus, the output voltage cannot be kept c onstant . since the winding current goes ahead of the winding voltage in the capaci tance area, the operation with hard switching occurs in q (h) and q (l ) . thus, the power loss increase s. this operation in the capacitance area is called the capacitive mode operation. the current resonant power supply must be operated without the c apacitive mode operation (refer to section 8.12 about detail s of it). figure 8 - 4 shows the basic operation waveform of current resonant power supply (see figure 8 - 3 a bout the symbol in figure 8 - 4 ). the current resonant waveforms in normal operation are divide d a period a to a period f . the current resonant power sup ply operates in the each period as follows. in following description , i d(h) is the current of q (h) , i d(l) is the current of q (l) , v f(h) is the forwerd voltage of q (h) , v f( l ) is the forwerd voltage of q ( l ) , i l is the current of l r , v in is an input voltage , v ci is ci voltage , and v cv is c v voltage . 1) period a when q (h) is on, energy is stored into the series resonant circuit by i d(h) flow ing through the resonant circuit and the transformer as shown in figure 8 - 5 . at the same time, the e nergy is transferred to the secondary circuit. when the primary winding voltage can not keep the secondary rectifier on, the energy to the secondary circuit is stopped . 2) period b after the secondary side current becomes zero, the resonant current flows to the primary side only as shown in figure 8 - 6 and ci is charged by it. figure 8 - 4 the basic operation waveforms of current resonant power supply figure 8 - 5 operation in period a figure 8 - 6 operation in period b i d ( l ) i d ( h ) i s 1 v g l v g h v d s ( l ) i c i v c i i s 2 a b c d e f v i n + v f ( h ) v d s ( h ) v i n c v c i l r q ( h ) q ( l ) l p o n o f f i d ( h ) v i n s 1 s 2 i s 1 v c v v c i c v c i l r q ( h ) q ( l ) l p o n o f f i d ( h ) v i n s 1 s 2
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 12 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 3) period c pireod c is the dead - time. both q (h) and q (l) are in off - state. when q (h) turns off, i l is flowed by the energy st ored in the series resonant circuit as shown in figure 8 - 7 , and c v is discharged. when v cv decreases to v f(l) , ? i d(l) flows through the body diode of q (l) and v cv is clamped to v f(l) . after that, q (l) turns on. since v ds(l) is nearly zero at the point, q (l) operates in zvs and zcs. t hus, switching loss is nearly zero. 4) period d when q (l) turns on , i d(l) flows as shown in figure 8 - 8 and the primary winding voltage of the transformer adds v ci . at the same time, e nergy is transferred to the secondary circuit. when the primary winding voltage can not keep the secondary rectifier on, the energy to the secondary circuit is stopped. 5) period e after the secondary side current becomes zero, the resonant current flows to the primary side only as shown in figure 8 - 9 and ci is charged by it. 6) period f this pireod is the dead - time. both q (h) and q (l) are in off - state. when q ( l ) turns off, ? i l is flowed by the energy stored in th e series resonant circuit as shown in figure 8 - 10 . c v is discharged. when v cv decreases to v in + v f(h) , ? i d( h ) flows through body diode of q ( h ) and v cv is clamped to v in + v f(h) . after that, q ( h ) turns on. since v ds( h ) is nearly zero at the point, q ( h ) operates in zvs and zcs. t hus, the switching loss is nearly zero. 7) after the period f then , i d( h ) flows and the operation returns to the period a. the above operation is repeated, the energy is transferred to the secondary side from the resonant circuit. figure 8 - 7 operation in period c figure 8 - 8 operation in period d figure 8 - 9 operation in period e figure 8 - 10 operation in period f c v c i l r q ( h ) q ( l ) l p o f f o f f i l v i n - i d ( l ) v c v c v c i l r q ( h ) q ( l ) l p o f f o n v i n i d ( l ) i s 2 s 1 s 2 v c i c v c i l r q ( h ) q ( l ) l p o f f o n v i n i d ( l ) s 1 s 2 c v c i l r q ( h ) q ( l ) l p o f f o f f - i l v i n - i d ( h ) v c v
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 13 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 8.2 startup operation figure 8 - 11 shows the vcc pin peripheral circuit. when the following all conditions are fulfilled, the ic starts the startup operation: the mains input voltage is provided, and the vsen pin voltage incre ases to the on - threshold voltage, v sen(on) = 1.300 v, or more. t he s tartup c urrent, i cc(st) , which is a constant current of 6.0 ma, is provided from the ic to capacitor c2 connected to the vcc pin, c2 is charged , and the vcc pin voltage increases to the operation start voltage, v cc(on) = 14.0 v, or more. the fb pin voltage increases to the oscillation start threshold voltage, v fb(on) = 0.30 v, or more. after that, the startup circuit stops automatically, in order to eliminate its own power consumption. figure 8 - 11 vcc pin peripheral circuit during the ic operation, the rectified voltage from the auxiliary winding voltage, v d , of figure 8 - 11 is a power sour ce to the vcc pin. the winding turns of the winding d should be adjusted so that the vcc pin voltage is applied to equation ( 7 ) within the specification of the mains input voltage range and output load range of the power supply. the target voltage of the winding d is about 1 9 v. ? cc < 32.0 (v) ( 7 ) the startup time, t s tart , is determined by the value of c2 and c6 connected to the css pin. since the startup time for c6 is much smaller than that for c2, the startup time is approximately given as below: start is the startup time in s, v cc(int) is the initial voltage of the vcc pin in v , and i cc(st) is the startup current, 6.0 ma 8.3 undervoltage lockout (uvlo) figure 8 - 12 shows the relationship of v cc and i cc . after the ic starts operation, when the vcc pin voltage decreases to v cc(off) = 9.8 v, the ic stops switching operation by the undervoltage lockout (uvlo) function and rever ts to the state before startup again. figure 8 - 12 v cc versus i cc 8.4 bias assist function figure 8 - 13 shows the vcc pin voltage behavior during the startup period. figure 8 - 13 v cc pin voltage during startup period when the conditions of section 8.2 are fulfilled, the ic starts operation. thus, the circuit current, i cc , increases, and the vcc pin voltage begins dropping. at the same time, the auxiliary winding voltage, v d , increases in proportion to the output voltage rise. thus, the vcc pin voltage is set by the balance between dropping due to the increase of i cc and rising due to the increase of the auxiliary winding voltage, v d . when the vcc pin voltage decreases to v cc(off) = 9.8 v , the ic stops switching operation and a startup failure occurs. in order to prevent thi s, when the vcc pin voltage decreases to the s tartup c urrent t hreshold b iasing v oltage, v cc(bias) = 11.0 v, the bias assist f unction is activated . 5 1 0 2 c s s v c c g n d u 1 r 4 v s p l c 4 r 2 r 3 r 5 c 2 c 6 c 1 4 v s e n s t d 1 1 8 1 v d r 1 i c c v c c o f f v c c o n v c c p i n v o l t a g e s t a r t s t o p i c s t a r t u p v c c p i n v o l t a g e v c c ( o n ) v c c ( b i a s ) v c c ( o f f ) s t a r t u p f a i l u r e s t a r t u p s u c c e s s t a r g e t o p e r a t i n g v o l t a g e t i m e b i a s a s s i s t p e r i o d i n c r e a s i n g b y o u t p u t v o l t a g e r i s i n g
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 14 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 while the bias assist f unction is activated, any decrease of the vcc pin voltage is counteracted by providing the s tartup c urrent, i cc(st) , from the startup circuit. it is necessary to check the startup process based on actual operation in the application, and a djust the vcc pin voltage, so that the startup failure does not occur. if vcc pin voltage decreases to v cc(bias) and the bias assist function is activated, the power loss increases. thus, vcc pin voltage in normal operation should be set more than v c c(bias) by the following adjustments. t he turns ratio of the auxiliary winding to the secondary - side winding is increased. the value of c2 in figure 8 - 11 is increased and/or the value of r1 is reduced. during all protection operation, the bias assist function is disabled. 8.5 soft start function figure 8 - 14 shows the soft - start operation waveforms. figure 8 - 14 soft - start operation the ic has soft start function to redu ce stress of peripheral component and prevent the c apacitive mode operation . during the soft start operation , c 6 connected to the css pin is charged by the css pin charge current, i css(c) = ? 105 a . the o scillation frequency is varied by the css pin voltage. the switching frequency gradually decreases from f (max)ss 1 = 500 khz at most, according to the css pin voltage rise. at same time, output power increase s . when the output voltage increases, the ic is operated with an oscillation frequency controlled by feedback. 1 the maximum frequency during normal operation is f (max) = 300 khz. when the ic becomes any of the following conditions, c 6 is discharged by the css pin reset current, i css(r) = 1.8 ma. the vcc pin voltage decreases to the operation stop voltage, v cc(off) = 9.8 v, or less. the vsen pin voltage decreases to the off - threshold voltage, v sen(off) = 1.0 v, or less. any of protection operations in protection mode (ovp, olp or tsd) is activated. 8.6 minimum and maximum switching frequency setting the minimum switching frequency is adjustable by the value of r5 (r css ) connected to the css pin. the relationship of r5 (r css ) and the externally adjusted minimum frequency, f (min)adj , is shown in figure 8 - 15 . the f (min)adj should be adjusted to more than the resonant frequency, f 0 , under the condition of the minimum mains input voltage and the maximum output power. the maximum switching frequency, f max , is determined by the inductance and the capacitance of the res onant circuit. the f max should be adjusted to less than the maximum frequency, f (max) = 300 khz. figure 8 - 15 r5 (r css ) versus f (min)adj 8.7 high - side driver figure 8 - 16 shows a bootstrap circuit. the bootstrap circuit is for driving to q (h) and is made by d 3 , r 12 and c 12 between the reg pin and the vs pin. when q (h) is off state and q (l) is on state, the vs pin voltage becomes about ground level and c 12 is charged from the reg pin. when the voltage of between the vb pin and the vs pin, v b - s , increases to v buv(on) = 7.3 v or more, an internal high - side drive circuit starts operation. when v b - s decreases to v buv(off) = 6.4 v or less, its drive circuit stops operation. in case the both ends of c 12 and 40 50 60 70 80 90 20 30 40 50 60 70 f (m(n)adj (khz) r css (k ) c s s p i n v o l t a g e p r i m a r y - s i d e w i n d i n g c u r r e n t 0 0 o c p l i m i t c 6 i s c h a r g e d b y i c s s ( c ) t i m e t i m e s o f t - s t a r t p e r i o d o c p o p e r a t i o n p e r o p d f r e q u e n c y c o n t r o l b y f e e d b a c k s i g n a l
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 15 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 d4 are short, the ic is protected by v buv(off) . d4 for protection against negative voltage of the vs pin d3 d3 shoul d be an ultrafast recovery diode of short recovery time and low reverse current. as for sankens diode lineup, ag01a ( v rm = 600 v ) of ufrd series is recommended for the specification that the maximum mains input voltage is 265vac. c11, c12, and r12 the va lues of c11, c12, and r12 are determined by total gate charge, qg, of external mosfet and voltage dip amount between the vb pin and the vs pin in the burst mode of the standby mode change. c11, c12, and r12 should be adjusted so that the voltage between th e vb pin and the vs is more than v buv( on ) = 7.3 v by measuring the voltage with a high - voltage differential probe. t he reference value of c11 is 0.47 f to 1 f. the time constant of c12 and r12 should be less than 500 ns. the values of c12 and r22 are 0.047 f to 0.1 f, and 2.2 to 10 . c11 and c1 2 should be a film type or ceramic capacitor of low esr and low leak age current . d4 d4 should be a schottky diode of low forward voltage, v f , so that the voltage between the vb pin and the vs pin must not decrease to the absolute maximum ratings of ? 0.3 v or less. figure 8 - 16 bootstrap circuit 8.8 constant voltage control operation figure 8 - 17 shows the fb pin peripheral circuit. the fb pin is sunk the feedback current by the photo - coupler , pc1, connected to fb pin. as a result, since the oscillation frequency is controlled by the fb pin, the output voltage is controlled to constant voltage (in inductance area). the feedback current increases under slight load condition , and thus the fb pin volta ge decreases. while the fb pin voltage decreases to the oscillation stop threshold voltage, v fb(off) = 0.20 v, or less, the ic stops switching operation. this oper ation reduces switching loss , and prevents the increasing of the secondary output voltage. in figure 8 - 17 , r8 and c9 are for phase compensation adjustm ent, and c5 is for high frequency noise rejection. the secondary - side circuit should be designed so that the collector current of pc1 is more than 195 a which is the absolute value of the maximum source current, i fb(max) . especially the current transfer ratio, ctr, of the photo coupler should be taken aging degradation into consideration. figure 8 - 17 fb pin peripheral circuit 8.9 standby function the ic has the standby function in order to increase circuit efficiency in light load. when the standby function is activated, the ic operates in the burst oscillation mode as shown in figure 8 - 18 . the burst oscillation has periodic non - switching intervals . thus, the b urst mode reduces switching losses . generally, to improve efficiency under light load conditions, the frequency of the burst mode becomes just a few kilohertz. in addition , the ic has the soft - on and the soft - off function in order to suppress rapid and sharp fluctuation of the drain current during the burst mode. thus, the audible noises can be reduced (refer to section 8.9.2 ). the operation of the ic changes to the standby operation by the external signal (refer to section 8.9.1 ). figure 8 - 18 standby waveform v g h v s v b r e g v g l g n d t 1 1 5 1 6 u 1 1 2 1 4 1 0 1 1 r 1 2 d 3 c 1 1 c 1 2 d 4 b o o t s t r a p c i r c u i t q ( h ) q ( l ) c v c i 3 10 fb gnd u 1 c 5 pc 1 c 9 r 8 t i m e p r i m a r y - s i d e m a i n w i n d i n g c u r r e n t n o n - s w i t c h i n g p e r i o d s w i t c h i n g p e r i o d s o f t - o n s o f t - o f f
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 16 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 8.9.1 standby mode changed by external signal figure 8 - 19 shows the standby mode change circuit with extern al signal. figure 8 - 20 shows the standby change operation waveforms. when the standby terminal of figure 8 - 19 is provided with the l signal, q1 turns off, c10 connected to the sb pin is discharged by the sink current, i sb(snk) = 10 a, and the sb pin voltage decreases. when the sb pin voltage decrease to the sb pin oscillation stop threshold voltage , v sb(off) = 0.5 v, t he operation of the ic is changed to the standby mode. when sb pin voltage is v sb(off) = 0.5 v or le ss and fb pin voltage is oscillation stop threshold voltage v fb(off) = 0.20 v or less, the ic stops switching operation. when the standby terminal is provided with the h signal and the sb pin voltage increases to standby threshold voltage v sb(stb) = 5.0 v or more, the ic returns to normal operation. figure 8 - 19 standby mode change circuit figure 8 - 20 standby change operation waveforms 8.9.2 burst oscillation operation in standb y operation, the ic operates burst oscillation where the peak drain current is suppressed by soft - on /soft - off function in order to reduce audible noise from transformer. during burst oscillation operation, the switching oscillation is controlled by sb pin voltage. figure 8 - 21 shows the burst oscillation operation waveforms. figure 8 - 21 burst oscillation operation waveforms when the sb pi n voltage decreases to v sb(off) = 0.5 v or less and the fb pin voltage decreases to v fb(off) = 0.20 v or less, the ic stops switching operation and the output voltage decreases. since the output voltage decreases, the fb pin voltage increases. when the fb pin voltage increases to the oscillation start threshold voltage , v fb(on) = 0.30 v, c10 is charged by i sb(src) = ? 10 a , and the sb pin voltage gradually increases. when the sb pin voltage increases to the oscillation start threshold voltage, v sb(on) = 0.6 v, the ic resumes switching operation, controlling the frequency control by the sb pin voltage. thus, the output voltage increases (soft - on). after that, when fb pin voltage decrease to o scillation s top t hreshold v oltage , v fb(off) = 0.20 v, c10 is discharged by i sb(snk) = 10 a and sb pin voltage decreases. when the sb pin voltage decreas es to v sb(off) again, the ic stops switching operation. thus, the output voltage decreases (soft - off) . t he sb pin discharge time in the soft - on and soft - off function depends on c10. when the value of c10 increases, the soft - on/soft - off function makes the p eak drain current suppressed, and makes the burst period longer. t hus, the output ripple voltage may increase and/or the vcc pin voltage may decrease. s t a n d b y u 1 g n d r e g s b f b p c 1 p c 2 p c 2 q 1 r 1 6 r 1 7 r 1 5 r 8 c 9 c 1 0 c 5 r 5 8 r 5 9 q 5 1 c 1 1 1 2 9 3 t i m e s t a n d b y s b p i n v o l t a g e p r i m a r y - s i d e m a i n w i n d i n g c u r r e n t v s b ( s t b ) s t a n d b y o p e r a t i o n 0 0 0 f b p i n v o l t a g e v f b ( o f f ) 0 s w i t c h i n g s t o p d i s c h a r g i n g b y i s b ( s n k ) v s b ( o f f ) h l h t i m e o u t p u t v o l t a g e s b p i n v o l t a g e p r i m a r y - s i d e m a i n w i n d i n g c u r r e n t 0 0 0 f b p i n v o l t a g e v f b ( o f f ) 0 d i s c h a r g e d b y i s b ( s n k ) v f b ( o n ) v s b ( o f f ) v s b ( o n ) o u t p u t c u r r e n t 0 c h a r g e d b y i s b ( s r c ) s o f t - o f f s o f t - o n
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 17 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 if the vcc pin voltage decreases to v cc(bias) = 11.0 v , the bias assist f unction is always activated , and it results in the increase of power loss (refer to section 8.4 ) . thus, it is necessary to adjust the value of c10 while checking the input power, the output ripple voltage, and the vcc pin voltage. the reference value of c10 is about 0.0 01 f to 0.1 f. 8.10 automatic dead time adjustment function the dead time is the period when both the high - side and the low - side power mosfets are off. as shown in figure 8 - 22 , if the dead time is shorter than the volta ge resonant period, the power mosfet is turned on and off during the voltage resonant operation. in this case, the power mosfet turned on and off in hard switching operation , and t he switching loss increase s . the automatic dead time adjustment function is the function that t he zvs (zero voltage switching) operation of q (h) and q (l) is controlled automatically by the voltage resonant period detection of ic . the voltage resonant period is varied by the power supply specifications (input voltage and output pow er, etc . ). however, the power supply with this function is un necessary to adjust the dead time for each power supply specification. figure 8 - 22 zvs failure operation waveform as shown in figure 8 - 23 , the vs pin detects the dv/dt period of rising and falling of the voltage between drain and source of the low - side power mosfet , v ds(l) , and the ic sets its dead time to that period. this function controls so that the high - side and the low - side power mosfets are automatically switched to zero voltage switching (zvs) operation. this function operates in the period from t d(min) = 0.35 s to t d(max) = 1.65 s. i n minimum output power at maximum input voltage and maximum output power at minimum input voltage, the zcs (zero current switching) operation of ic ( the drain current flows through the body diode is about 1 s as shown in figure 8 - 24 ) , should be checked based on actual operation in the application. figure 8 - 23 vs pin and dead t ime period figure 8 - 24 zcs check point 8.11 brown - in and brown - out function figure 8 - 25 shows the vsen pin peripheral circuit. this function detects the mains input voltage, and stops switching operation during low mains input voltage, to prevent exceeding input current and over heating. r2 to r4 set the detection voltage of this function. when the vcc pin voltage is higher than v cc(on) , t his function operates depending on the vsen pin voltage as follows: when the vsen pin voltage is more than v sen (on) = 1.300 v, the ic starts. when the vsen pin voltage is less than v sen (off) = 1.0 v, the ic st ops switching operation. figure 8 - 25 vsen pin peripheral circuit q ( h ) d - s v o l t a g e , v d s ( h ) v g l v g h v o l t a g e r e s o n a n t p e r i o d l o s s i n c r e a s e b y h a r d s w i t c h i n g o p e r a t i o n d e a d t i m e t 1 c v c i v s v g l v g h g n d u 1 1 5 1 1 1 0 1 6 m a i n r v d e t e c t o r d v d t d t o n o n o f f v d s ( l ) l o w - s i d e , v d s ( l ) d e a d t i m e p e r i o d q ( h ) d r a i n c u r r e n t , i d ( h ) f l o w s t h r o u g h b o d y d i o d e a b o u t 1 s 1 0 g n d u 1 r 4 v s e n c 4 r 2 r 3 c 1 1 v a c v s p l 4 v d c
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 18 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 given, the dc input voltage when the ic starts as v in(on) , the dc input voltage when the switching operation of the ic stops as v in(off) . v in(on) is calculated by equation ( 9 ) . v in( off ) is calculated by equation ( 10 ) . thus, t he relationship between v in(on) and v in(off) is equation ( 11 ) . select a res istor designed against electromigration according to the requirement of the application, or use a combination of resistors in series for that to reduce each applied voltage the reference value of r2 is about 10 m . c 4 shown in figure 8 - 25 is for reducing ripple voltage of detection voltage and making delay time. the value is 0.1 f or more, and the reference value is about 0.47 f. the value of r 2, r3 and r 4 and c 4 should be selected based on actual operation in the application. 8.12 capacitive mode detection function the resonant power supply is operated in the inductance area shown in figure 8 - 26 . in the capacitance area, the power supply becomes the c apacitive m ode operation (refer to section 8.1 ). in order to prevent the operation , the minimum oscillation frequency is needed to be set higher than f 0 on each power supply specification . however, the ic has the c apacitive mode operatio n detection function kept the frequency higher than f 0 . thus, the minimum oscillation frequency setting is unnecessary and the power supply design is easier. in addition, the ability of transformer is improve d because the operating frequency can operate cl ose to the resonant frequency, f 0 . figure 8 - 26 operating area of resonant power supply the resonant current is detected by the rc pin, and the ic prevents the capacitive mode operation. when the capacitive mode is detected, the c7 connected to cl pin is charged by i cl(src) = ? 17 a. when the cl pin voltage increases to v cl(olp) , the olp is activated and the switching operation stops. during the olp operation, the intermittent operation by uvlo is repeated (refer to section 8.17 ). the detection voltage is changed to v rc1 = 0.10 v or v rc2 = 0.50 v depending on the load as shown in figure 8 - 28 and figure 8 - 29 . the capaciti ve mode o peration d etection f unction operations as follows: period in which the q (h) is on figure 8 - 27 shows the rc pin waveform in the inductance area, and figure 8 - 28 and figure 8 - 29 shows the rc pin waveform in the capacitance area. in the inductance area , the rc pin voltage doesn t cross the plus side detection voltage in the downward direction during the on period of q (h) as shown in figure 8 - 27 . on the contrary, in the capacitance are a, the rc pin voltage c rosses the plus side detection voltage in the downward direction. at this point, the capacitive mode operation is detected. thus, q (h) is turned off, and q (l) is turned on , as shown in figure 8 - 28 and figure 8 - 29 . period in which the q (l) is on contrary to the above of q (h) , in the capacitance are a, the rc pin voltage crosses the minus side detection voltage in the upward directiont during the on period of q ( l ) at this point, the capacitive mode operation is detected. thus, q ( l ) is turned off and q ( h ) is turned on . as above, since the c apacitive mode operation is detected by pulse - by - pulse and the operating frequency is synchronized with the frequency of the c apacitive f 0 c a p a c i t a n c e a r e a i n d u c t a n c e a r e a o p e r a t i n g a r e a i m p e d a n c e r e s o n a n t f r e s u e n c y h a r d s w i t c h i n g s i f t s w i t c h i n g u n c o n t r o l l a b l e o p e r a t i o n
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 19 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 mode operation, and the c apacitive mode operation is prevented. i n addition to the adjusting method of r ocp , c3, and r6 in section 8.16 , r ocp , c3, and r6 should be adjusted so that the absolute value of the rc pin voltage increases to more than |v rc2 | = 0.50 v under the condition caused the capacitive mode operation easily, such as startup, turning off the mains input voltage, or output shorted. the rc pin voltage must be within th e absolute maximum ratings of ? 6 to 6 v figure 8 - 27 rc pin voltage in inductance area figure 8 - 28 high side c apacitive mode detection in light load figure 8 - 29 high side c apacitive mode detection in heavy load 8.13 input electrolytic capacitor discharge function figure 8 - 30 shows an application that residual voltage of the input capacitor, c1, is reduced after turning off the mains input voltage. r2 is connected to the ac input lines through d7 and d8. just after turning off the mains input voltage, the vsen pin voltage decr eases to v sen(off) = 1.0 v according to a short time of the time constant with r2 to r4 and c4, and c1 is discharged by the equivalent to i cc(st) = 6.0 ma. figure 8 - 30 input capacitor discharge 8.14 reset detection function the magnetizing current means the circulating current applied for resonant operation, and that flows only into the primary - side circuit. during the startup period when the feedback control for the output voltage is inactive, if the magnetizing current cannot be reset in the on - period because of unbalanced operation, negative current may flows just before a power mosfet turns off, and hard switching may occur, and stresses of power mosfet may increase. to prevent this hard switching, the ic incorporates the re set detection function. figure 8 - 32 shows the high - side operation and drain current waveform examples in normal resonant operation and reset failure op eration. figure 8 - 31 shows the reset detection operation example at the high - side on - period. figure 8 - 31 reset detection operation example at high - side on - period 0 + v r c v d s ( h ) o n o f f r c p i n v o l t a g e v d s ( h ) 0 0 c a p a c i t i v e m o d e o p e r a t i o n d e t e c t i o n o n o f f + v r c 2 r c p i n v o l t a g e + v r c 1 v d s ( h ) 0 0 c a p a c i t i v e m o d e o p e r a t i o n d e t e c t i o n o n o f f + v r c 2 r c p i n v o l t a g e + v r c 1 1 0 g n d u 1 r 4 v s e n r 2 r 3 c 1 4 v s p l 1 m a i n i n p u t o f f d 7 d 8 s t 1 8 6 m a ( i c c ( s t ) ) 0 v r c = + 0 . 1 v e x p a n d e d o n - p e r i o d i d ( h ) v g l p i n v o l t a g e l o w h i g h n o r m a l o n - p e r i o d t r s t ( m a x ) = 5 s r e s e t f a i l u r e w a v e f o r m v g h p i n v o l t a g e t u r n i n g - o n i n n e g a t i v e d r a i n c u r r e n t l o w h i g h
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 20 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 the reset detection function extend s the on - period until the absolute value of rc pin voltage, |v rc1 |, increases to 0.10 v or more. thus, this function prevents the hard switching operation. when the on - period reaches the maximum reset time, t rst(max) = 5.0 s, the on - period expires at that moment, and the power mosfet turns off (refer to figure 8 - 31 ). figure 8 - 32 high - side operation and drain current waveform examples in normal resonant operation and in reset failure operation i d ( h ) c v c i l r q ( h ) q ( l ) l p c v c i l r l p c v c i l r l p c v c i l r l p c v c i l r l p c v c i l r l p a b c e f 0 m a g n e t i z i n g c u r r e n t v d s ( h ) = 0 v v d s ( h ) = 0 v t u r n i n g o n a t v d s ( l ) = 0 v r e s u l t s i n s o f t - s w i t c h i n g v d s ( h ) = 0 v v d s ( h ) = 0 v t u r n i n g o n a t v d s ( l ) > > 0 v r e s u l t s i n h a r d - s w i t c h i n g r e c o v e r y c u r r e n t o f b o d y d i o d e p o i n t a p o i n t b p o i n t c p o i n t d p o i n t e p o i n t f o f f o f f o n o f f o f f o f f o f f o f f o n o f f o f f o n d i d ( h ) q ( h ) q ( l ) q ( h ) q ( l ) q ( h ) q ( l ) q ( h ) q ( l ) q ( h ) q ( l ) i d ( h ) i d ( h ) i d ( h ) i d ( h ) i d ( h ) n o r m a l r e s o n a n t o p e r a t i o n r e s e t f a i l u r e o p e r a t i o n
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 21 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 8.15 overvoltage protection (ovp) when the voltage between the vcc pin and the gnd pin is applied to the ovp t hreshold v oltage , v cc(ovp) = 32.0 v , or more, the overvoltage protection (ovp) is activated. the ic has two operation types of ovp. one is the auto restart . t he other is latched shutdown. when the auxiliary winding supplies the vcc pin voltage, the ovp is able to detect an excessive output voltage, such as when the detection circuit for output control is open in the secondary - side circuit because the vcc pin voltage is proportional to the output voltage. the output voltage of the secondary - side circuit at ovp operation, v out(ovp) , is approximately given as below : out(normal) : output voltage in normal operation v cc(normal) : vcc pin voltage in normal operatio n auto restart type: ssc3s901 figure 8 - 33 shows the o v p operation waveforms of auto restart type. when the ovp is activated, the ic stops switching ope ration and vcc pin voltage decreases . when vcc pin voltage decrease s to v cc(p.off) = 9.8 v, the ovp operation is released and the startup circuit is activated. when vcc pin voltage is increased to v cc(on) = 14.0 v by startup current, the ic starts the switching operation. during the ovp operation, the intermittent operation by uvlo is repeated . when the fault condition is removed, the ic returns to normal operation automatically. figure 8 - 33 a uto r estart t ype o v p operation waveforms latched shutdown t ype: ssc3s902 figure 8 - 34 shows the o v p operation waveforms of l atched s hutdown type . when the ovp is activated, the ic stops switching operation at the latched state and vcc pin voltage decreases . when vcc pin voltag e decrease s to v cc(off) = 9.8 v, the startup circuit is activated. when vcc pin voltage is increased to v cc(on) = 14.0 v by startup current, the startup circuit is turned off and vcc pin voltage decreases. during the ovp operation, the latch state is kept by turning on/off of the startup circuit. the latched state is release d by following condition : vcc pin voltage is decreased to v cc(l.off) = 7.8 v or less by turning off the input voltage , or vsen pin voltage is decreased to v sen(off) = 1.0 v or less . figure 8 - 34 l atched s hutdown type o v p operation waveforms 8.16 overcurrent protection (ocp) the overcurrent protection (ocp) detects the drain current, i d , on pulse - by - pulse basis, and limits output power. in figure 8 - 35 , this circuit enables the value of c3 for shunt capacitor to be smaller than the va lue of ci for current resonant capacitor, and the detection current through c3 is small. thus, the loss of the detection resistor, r ocp , is reduced, and r ocp is a small - sized one available. t here is no convenient method to calculate the accurate resonan t c urrent value according to the mains input and output conditions , and others . thus, r ocp , c3, and c6 should be adjusted based on actual operation in the application. the following is a reference adjusting method of r ocp , c3, r6, and c8: c 3 and r ocp c 3 is 10 0pf to 330pf ( around 1 % of ci value ). r ocp is around 100 . given the current of the high side power mosfet at on state as i d(h) . r ocp is calculated equation ( 14 ) . the detection voltage of r ocp is used the detection of the c apacitive m ode o peration (refer to section 8.12 ). therefore, setting of r ocp and c 3 should be taken account of both ocp and the c apacitive m ode o peration. v c c p i n v o l t a g e v g h / v g l 0 0 v c c ( p . o f f ) v c c ( o n ) v c c ( o v p ) v c c p i n v o l t a g e v g h / v g l 0 0 v c c ( o f f ) v c c ( o n ) v c c ( o v p ) v c c ( l . o f f ) i n p u t v o l t a g e t u r n o f f r e l e a s e l a t c h m o d e
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 22 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 r 6 and c 8 are for high frequency noise reduction. r 6 is 100 to 470 . c 6 is 100 pf to 1000 pf. figure 8 - 35 rc pin peripheral circuit the ocp operation has two - step thres hold voltage as follows: step i, rc pin threshold voltage (low), v rc(l) : this step is active first. when the absolute value of the rc pin voltage increases to more than |v oc(l) | = 1.50 v, c6 connected to the css pin is discharged by i c ss(l) = 1.8 ma. thus, the switching frequency increases, and the output power is limited. during discharging c6, when the absolute value of the rc pin voltage decre ases to |v rc(l) | or less, the discharge stops. step ii, rc pin thr e shold voltage (high - speed), v rc(s) : this step is active second. when the absolute value of the rc pin voltage increases to more than |v rc(s) | = 2.30 v, the high - speed ocp is activated, and power mosfets reverse on and off. a t the same time, c6 is discharged by i css(s) = 20.5 ma. thus, the switching frequency quickly increases, and the output power is quickly limited. this step operates as protections for exceeding overcurrent, such as the output shorted. when the absolute value of the rc pin voltage decreas es to |v rc(s) | or less, the operation is changed to the above step i. when olp input voltage compensation is used, cl pin voltage is needed to reach the threshold voltage of overload protection (olp), v cl(olp) , in the state that rc pin voltage is less than v rc(l) . therefore , when output power increases, the olp is activated (refer to section 8.17 ). when the input voltage is constant like pfc output, olp input voltage compensation is unnecessary. therefore , when output power increases, the above ocp operation (step i and step ii ) is a ctivated. 8.17 overload protection (olp) with input voltage compensation 8.17.1 overload protection (olp) when cl pin voltage becomes the threshold voltage of overload protection (olp), v cl(olp) , the olp is activated and the switching operation stops. v cl(olp) is depe nded on the input voltage by olp input voltage compensation function as shown in section 0 . the trigger of olp is d i f f erent according to the c ase with olp input voltage compensation function or without it. without olp input voltage compensation function figure 8 - 36 shows the olp operation wav eforms. when the absolute value of rc pin voltage increases to |v rc(l) | = 1.50 v by increasing of output power, the overcurrent protection (ocp) is activated . after that, the c7 connected to cl pin is charged by i cl = ? 17 a. when the ocp state continues and cl pin voltage increases to v cl(olp) , the olp is activated. with olp input voltage compensation function cl pin voltage is needed to reach v cl(olp) in the st ate that rc pin voltage is less than v rc(l) . when cl pin voltage reaches v cl(olp) in one of the following condition, the olp is activated as shown in figure 8 - 37 . 1) the output power increases, cl pin voltage increase s to v cl(olp) which is constant. 2) the input voltage increases, v cl(olp) depending on olp input voltage compensation decreases to cl pin voltage. figure 8 - 36 olp operation waveform without olp input voltage compensation function t 1 p l r 6 c v c i c 3 c 8 v s v g l v g h g n d c s s u 1 1 5 1 1 5 7 8 1 0 1 6 i ( h ) r c c 6 r o c p r 7 r 5 q ( h ) q ( l ) v g h / v g l 0 r c p i n v o l t a g e c l p i n v o l t a g e v r c ( l ) v r c ( l ) v c l ( o l p ) c h a r g e d b y i c l 0 0
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 23 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 figure 8 - 37 olp operation waveform with olp input volt age compensation function the ic series has two operation types of o lp . one is the auto restart . t he other is latched shutdown. auto restart type: ssc3s901 figure 8 - 38 shows the auto restart type olp operatio n waveforms in the case without olp input voltage compensation function. when the o l p is activated, the ic stops switching operation . during the olp operation, the intermittent operation by uvlo is repeated (refer to section 8.15 ). when the fault condition is removed, the ic returns to normal operation automatically. latched shutdown t ype: ss c3s902 figure 8 - 39 shows the l atched s hutdown type o l p operation waveforms in the case without olp input compensation function. when the o l p is activa ted, the ic stops switching operation at the latched state . during the olp operation, the latch state is kept by turning on/off of the startup circuit (refer to section 0 ). the latched state is released by following condition : vcc pin voltage is decreased to v cc(l.off) = 7.8 v or less by turning off the input voltage , or vsen pin voltage is decreased to v sen(off) = 1.0 v or less . figure 8 - 38 auto restart type olp waveform without olp input voltage compensation function figure 8 - 39 l atched s hutdown typ e olp waveform without olp input voltage compensation function v g h / v g l 0 r c p i n v o l t a g e c l p i n v o l t a g e v r c ( l ) v r c ( l ) v c l ( o l p ) i n p u t v o l t a g e v c l ( o l p ) d e c r e a s e s t o c l p i n v o l t a g e . 0 0 0 c a s e 1 ) c a s e 2 ) v c c p i n v o l t a g e v g h / v g l 0 0 v c c ( p . o f f ) v c c ( o n ) r c p i n v o l t a g e c l p i n v o l t a g e v r c ( l ) v r c ( l ) v c l ( o l p ) 0 0 v c c p i n v o l t a g e v g h / v g l 0 0 v c c ( o f f ) v c c ( o n ) r c p i n v o l t a g e c l p i n v o l t a g e v r c ( l ) v r c ( l ) v c l ( o l p ) 0 0 v c c ( l . o f f ) i n p u t v o l t a g e t u r n o f f r e l e a s e l a t c h m o d e
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 24 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 8.17.2 olp input voltage compensation function in the case without olp input voltage compensation function, when the absolute value of rc pin volta ge increases to |v rc(l) | = 1.50 v, the capacitor connected to cs pin is charged. w hen cs pin voltage increases to v cl(olp) , the olp is activated (refer to figure 8 - 36 ). in the constant voltage control of current resonant topology , when the input voltage increases, the resonant frequency increases, and the peak drain current decreases. since |v rc(l) | is a fixed value, when output power increases at the constant rate, there are the output power difference at olp operation in high and low input voltages as shown in figure 8 - 40 .in the universal mains input voltage, the output power at olp operation is very large in the maximum input voltage, and component stresses are increased by heating. therefore, the ic has olp input voltage compensation function that the output power difference at olp operation is limited in input voltages, and can realize power supply of universal mains input voltage (85 vac to 265vac). as shown in figure 8 - 41 , this function compensat es the olp threshold voltage, v cl(olp) , depending on input voltage, and is used so that cl pin voltage reaches v cl(olp) in the state that rc pin vo ltage is less than v rc(l) . figure 8 - 40 olp operation waveforms according to input voltage (without olp input voltage compensation) figure 8 - 41 olp operation waveforms according to input voltage (with olp input voltage compensation) pl pin and cl pin setup: the primary - side winding current as shown in figure 8 - 42 includes the mag netizing current not transferred to the secondary - side circuit, and the load current proportional to the output current. the current separated from the primary - side winding current by c3 flows to the pl pin. as shown in figure 8 - 43 , the primary - side winding current flows to the c7 connected to cl pin during the high side power mosfet turning on. the magnetizing current becomes zero by charging and discharging. only the load current is charged to c7. as a result, the cl pin voltage is proportional to the output current. on actual operation of the application, c7 connected to the cl pin should be adjusted so that ripple voltage of the cl pin reduces. r7 connected to the pl pin should be adjusted so that the olp at the minimum mains input voltage is activated before the ocp limited by the low threshold voltage of ocp, v rc(l) . the pl pin voltage and the cl pin voltage must be within the absolute maximum ratings of ? 0.3 to 6 v, by adjusting r7, in the ocp operation point at the minimum mains input voltage. vspl pin setup: the vspl pin detects the mains input voltage. both v spl and the setting voltage in section 8.11 brown - in and brown - out function are determined by r2, r3, and r4. both of them should be adjusted based on actual operation in the application. v g h / v g l 0 r c p i n v o l t a g e c l p i n v o l t a g e v r c ( l ) v r c ( l ) v c l ( o l p ) i n p u t v o l t a g e o u t p u t p o w e r o u t p u t p o w e r d i f f e r e n c e t h a t o c c u r s b y i n p u t v o l t a g e a c 8 5 v a c 2 6 5 v 0 0 0 0 o l p a c t i v e o l p a c t i v e v g h / v g l 0 r c p i n v o l t a g e c l p i n v o l t a g e v r c ( l ) v r c ( l ) v c l ( o l p ) i n p u t v o l t a g e o u t p u t p o w e r a c 8 5 v a c 2 6 5 v 0 0 0 0 o u t p u t p o w e r d i f f e r e n c e t h a t o c c u r s b y i n p u t v o l t a g e o l p a c t i v e o l p a c t i v e
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 25 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 figure 8 - 42 the peripheral circuit of vspl, pl, cl pin figure 8 - 43 the waveforms of cl pin relation ship b etween v cl(olp) and v spl : v cl(olp) is olp threshold voltage of cl pin. v spl is vspl pin voltage. there are relationship b etween v cl(olp) and v spl as shown in figure 8 - 44 . figure 8 - 44 vspl pin voltage versus typical olp threshold voltage, v cl(olp) without olp input voltage compensation func - tion: figure 8 - 45 shows the circuit that olp input voltage compensation function is canceled . the resistance of between pl pin and gnd pin is about 100 k . the fixed vspl pin voltage is about 3v, and should be adjusted by checking the heating of component in olp operation. figure 8 - 45 the ic peripheral circuit without olp input voltage compensation function 8.18 t hermal shutd o wn (tsd) when the junction temperature of the ic reach to the thermal shutdown temperature t j(tsd) = 140 c (min.), thermal shutd o wn (tsd) is activated . auto restart type: ssc3s901 when the tsd is activated, the ic stops switching operation . when the vcc pin voltage is decreased to v cc ( p.off ) = 9.8 v or less and the junction temperature of the ic is decreased to less than t j(tsd) , the ic restarts . during the protection mode, restart and stop are repeated. when the fault condition is removed , the ic returns to normal operation automatically. latched shutdown t ype: ssc3s902 when the tsd is activated, the ic stops switching operation at the latched state . during the tsd operation, the latch state is kept by turning on/off of the startup circui t (refer to section 0 ). the latched state is released by following condition : vcc pin voltage is decreased to v cc(l.off) = 7.8 v or less by turning off the input voltage , or vsen pin voltage is decreased to v sen(off) = 1.0 v or less . t 1 p l r 6 c v c i c 3 c 8 v s v g l v g h g n d u 1 1 5 1 1 7 8 1 0 1 6 r c r o c p r 7 q ( h ) q ( l ) c l 6 c 7 r 4 v s e n r 2 r 3 c 1 4 v s p l 1 v s p l m a i n s i n p u t o u t p u t c u r r e n t l o a d c u r r e n t m a g n e t i z i n g c u r r e n t c l p i n v o l t a g e c l p i n s o u r c e c u r r e n t r o c p v o l t a g e v g h p i n v o l t a g e 0 v 0 a 0 v p r o p o r t i o n a l v o l t a g e t o o u t p u t c u r r e n t l o a d c u r r e n t m a g n e t i z i n g c u r r e n t 0 1 2 3 4 5 0 1 2 3 4 5 6 v cl(olp) (v) v spl (v) t 1 p l r 6 c v c i c 3 c 8 v s v g l v g h g n d u 1 1 5 1 1 7 8 1 0 1 6 r c r o c p a b o u t 1 0 0 k q ( h ) q ( l ) c l 6 c 7 v s p l 4 a b o u t 3 v
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 26 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 9. design notes 9.1 external components take care to use the proper rating and proper type of components. 9.1.1 input and ou tput electrolytic capacitor s apply proper derating to ripple current, voltage, and temperature rise. the e lectrolytic c apacitor of high ripple current and low impedance types, designed for switch mode power supplies, is recommended to use . 9.1.2 resonant transformer the resonant power suppl y uses the leakage inductance of transformer. therefore, in order to reduce the effect of the eddy current and the skin effect, the wire of transformer should be used a bundle of fine litz wires. 9.1.3 current detection resistor, r ocp choose a type of low internal inductance because a high frequency switching current flows to r ocp , and of properly allowable dissipation. 9.1.4 current resonant capacitor, ci since large current flows into ci, choose a capacitor of low loss and high allowable ripple current, such as polypropylene capacitor. in addition, ci must be considered its frequency characteristic in order to flow high frequency current. 9.1.5 gate pin peripheral circuit the vgh pin and the vgl pin are gate drive output pins for external power mosfets. the peak sourc e current of both of them is C 540 ma, and the peak sink current is 1.50 a. d s of figure 9 - 1 makes a turn - off speed faster. r a , r b and ds should be adjusted considering power loss es of power mosfet s , gate waveform s (reduction of ringing caused by pattern layout and others) , and emi noise. r a is about 33 to 33 0 . r b is about 10 . r gs prevents malfunctions caused by steep d v /dt at turning off power mosfet. r gs is recommended to be a resistor of 10 k to 100 k close to the g ate and the s ource of power mosfet . when the gate resistances are adjusted, the gate waveforms should be checked that the dead time is ensur ed as shown in figure 9 - 2 . figure 9 - 1 power mosfet peripheral circuit figure 9 - 2 dead time confirmation 9.2 pcb trace layout and component placement the switching power supply circuit has the high frequency and high voltage trace s. since the pcb circuit design and the component layout significantly affect the power supply operation, emi noise, and power dissipation, the high frequency trace of pcb shown in figure 9 - 3 should be designed low impedance by small loop and wi de trace. figure 9 - 3 high frequency current loop (hatched areas) d s r a r g s d r a i n s o u r c e g a t e r b h i g h - s i d e g a t e l o w - s i d e g a t e v t h ( m i n . ) v t h ( m i n . ) d e a d t i m e d e a d t i m e
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 27 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 in addition, the pcb circuit design should be taken account as follows: figure 9 - 4 shows the circuit design example. 1) main circuit trace layout this is the main trace containing switching currents, and thus it should be as wide trace and small loop as possible. 2) control groun d trace layout when large current flows into the control ground trace, the operation of ic might be affected by it. the control ground trace should be separate from the main circuit trace, and should be connected at a single point grounding as close to the gnd pin as possible. 3) vcc trace layout this is the trace for supplying power to the ic, and thus it should be as small loop as possible. if c 3 and the ic are distant from each other, placing a film capacitor c f (about 0.1 f to 1.0 f) close to the vcc pi n and the gnd pin is recommended. 4) peripheral components for the ic control these components should be placed close to the ic, and be connected to the ic pin as short as possible. 5) bootstrap circuit components these components should be connected to the ic p in as short as possible, and the loop for these should be as small as possible. 6) secondary side rectifier smoothing circuit trace layout this is the trace of the rectifier smoothing loop, carrying the switching current, and thus it should be as wide trace a nd small loop as possible. figure 9 - 4 peripheral circuit trace example around the ic v a c t 1 v s p l v s e n v c c f b c s s c l p l r c s b s t n c v g h v s v b n c r e g v g l g n d 1 1 5 1 6 1 7 1 8 4 3 2 u 1 s s c 3 s 9 0 0 7 6 5 1 2 1 3 1 4 9 8 1 0 1 1 p c 1 b r 1 c 1 r 2 r 3 r 4 c 4 c f c 5 c 9 r 8 c 6 r 5 c 7 c 8 r o c p r 6 r 7 c 1 0 r 1 5 c 2 r 1 d 1 c 1 1 d 3 r 1 2 c 1 2 d 4 d 5 r 1 0 r 1 1 q ( h ) q ( l ) d 6 r 1 3 r 1 4 c v c i c 3 d 5 3 d 5 4 c 5 2 c y a r 1 6 r 1 5 ( 1 ) m a i n t r a c e s h o u l d b e w i d e a n d s h o r t ( 3 ) l o o p o f v c c a n d c 2 s h o u l d b e s h o r t ( 2 ) g n d t r a c e f o r i c s h o u l d b e c o n n e c t e d a t a s i n g l e p o i n t ( 4 ) p e r i p h e r a l c o m p o n e n t s f o r i c c o n t r o l s h o u l d p l a c e n e a r i c ( 5 ) b o o t s t r a p t r a c e s h o u l d b e s m a l l l o o p ( 6 ) m a i n t r a c e o f s e c o n d a r y s i d e s h o u l d b e w i d e a n d s h o r t
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 28 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 10. pattern layout example the following show the pcb pattern layout example and the schematic of circuit using SSC3S900 . t he above circuit symbols correspond to these of figure 10 - 1 . figure 10 - 1 pcb circuit trace layout example figure 10 - 2 circuit schematic for pcb circuit trace layout lp d (1)main trace should be wide and short (6)main trace of secondary side should be wide and short (5)boot strap trace should be small loop (4)peripheral components for ic control should place d near ic (2)gnd trace for ic should be connected at a single point (3)loop of vcc and c2 should be short s1 - 1 s1 - 2 s 2 - 1 s 2 - 2 v r 1 0 1 c x 1 0 1 c n 1 f 1 0 1 d 2 0 2 r 2 1 3 c 2 0 3 c 1 0 4 r 2 0 1 r 2 0 2 r 2 0 3 r 2 0 4 r 2 0 5 c 2 0 4 r 2 0 9 c 2 0 5 c 2 0 6 c 2 0 7 r 2 1 2 d 2 0 5 r 2 2 5 r 2 2 1 d 2 0 1 c 2 0 1 c 2 1 2 c 2 1 4 c 2 1 5 c 1 0 3 d 2 0 3 d 2 0 4 r 2 1 5 d 2 0 6 c 2 2 5 c 2 0 9 c 2 0 8 r 2 0 8 r 2 0 7 r 2 0 0 c 2 1 0 q 2 0 4 r 2 1 8 r 2 1 7 d 2 0 7 d 2 0 8 c 2 1 3 p c 2 0 1 p c 2 0 2 c 2 1 6 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 1 2 3 4 5 6 7 8 9 t h 1 0 1 t 1 l 1 0 1 c 2 1 7 q 2 0 1 q 2 0 2 r 2 0 6 r 1 0 1 r 1 0 2 r 1 0 3 l 1 0 2 c x 1 0 2 c 1 0 2 c 1 0 1 c 2 1 8 c 2 0 2 r 2 1 9 r 2 1 4 r 2 1 1 r 2 3 0 c 2 1 1 p d 1 3 6 4 p s a 5 0 1 1 2 _ r e v . 1 . 1 c n 6 0 1 r 6 0 9 c 3 0 1 c 3 0 8 r 3 0 2 r 3 0 1 r 3 0 6 r 3 0 7 r 3 1 0 r 3 0 3 c 3 0 5 p c 2 0 1 q 3 0 1 r 3 0 4 c 6 0 5 q 6 0 1 p c 2 0 2 d 6 0 1 r 6 0 1 r 6 0 2 r 6 1 0 p o w e r _ o n / o f f c 3 0 4 1 2 v c n 4 0 1 q 6 0 6 r 6 1 4 r 6 1 6 r 6 1 5 c 6 0 6 s 1 s 2 1 0 8 , 9 7 r 6 0 4 r 3 0 5 q 6 0 2 d 3 0 1 d 3 0 2 c n 6 0 2 r 6 1 3 c 3 0 2 c 3 0 9 c 6 0 4 2 4 v s 3 s 4 d 3 0 4 d 3 0 3 1 4 1 3 1 2 d 6 0 2 r 6 0 5 r 6 0 6 r 6 0 3 r 3 0 9 r 3 0 8 j 2 j 5 / / j 7 j 3 / / j 8 j 1 3 r 2 1 0 j 1 4 j 1 8 t r 1 j 1 5 r 2 1 6 j 6 j 1 j 9 j 2 3 j 1 1 r 2 2 0 j 1 2 j 2 4 j 3 3 j 2 4 j 3 3 c 6 0 1 j 2 6 j 2 0 , j 3 0 , j 3 2 c 3 0 3 j 2 1 j 2 7 j 3 1 j 2 9 j 2 8 v s e n c l r c v c c f b v s p l c s s p l s b i c 2 0 1 s s c 3 s 9 0 0 s t n c r e g n c v g h v s v b v g l g n d
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 29 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 11. reference design of power supply as an example, the following show the power supply specification, the circuit schematic, the bill of materials, and the transformer specification. the values in bill of materials are reference design. t hey are necessary to be adjusted based on actual operatio n in the application. power supply specification ic ssc3s901 input voltage (output of pfc) dc 390 v maximum output power 227.1 w output 1 13 v / 6.7 a output 2 100 v / 1.4a circuit schematic bill of materials symbol part type rating recommended sanken parts c103 electrolytic 450 v, 120 f, 2012 f, 2012 f, 2012 f, 2012 f, 2012 f, f f p f c o u t d 2 0 2 r 2 1 3 c 2 0 3 c 1 0 4 r 2 0 1 r 2 0 2 r 2 0 3 r 2 0 4 r 2 0 5 c 2 0 4 r 2 0 9 c 2 0 5 c 2 0 6 c 2 0 7 r 2 1 2 d 2 0 5 r 2 2 5 r 2 2 1 c 2 0 1 c 2 1 2 c 2 1 4 c 2 1 5 c 1 0 3 d 2 0 3 d 2 0 4 r 2 1 5 d 2 0 6 c 2 2 5 c 2 0 9 r 2 0 8 r 2 0 0 c 2 1 0 q 2 0 4 r 2 1 8 r 2 1 7 p c 2 0 1 p c 2 0 2 c 2 1 6 t 1 c 2 1 7 q 2 0 1 q 2 0 2 r 2 0 6 c 2 1 8 c 2 0 2 r 2 1 9 r 2 1 4 r 2 1 1 r 2 3 0 c 2 1 1 p d 1 3 6 4 c n 6 0 1 r 6 0 9 c 3 0 1 c 3 0 8 r 3 0 2 r 3 0 1 r 3 0 6 r 3 0 7 r 3 1 0 r 3 0 3 c 3 0 5 p c 2 0 1 q 3 0 1 r 3 0 4 c 6 0 5 q 6 0 1 p c 2 0 2 d 6 0 1 r 6 0 1 r 6 0 2 r 6 1 0 p o w e r _ o n / o f f c 3 0 4 1 3 v c n 4 0 1 q 6 0 6 r 6 1 4 r 6 1 6 r 6 1 5 c 6 0 6 s 1 s 2 1 0 8 , 9 7 r 6 0 4 r 3 0 5 q 6 0 2 d 3 0 1 d 3 0 2 c n 6 0 2 r 6 1 3 c 3 0 2 c 3 0 9 c 6 0 4 1 0 0 v s 3 s 4 d 3 0 4 d 3 0 3 1 4 1 3 1 2 d 6 0 2 r 3 0 9 r 3 0 8 j 5 / / j 7 j 3 / / j 8 j 1 3 r 2 1 0 j 1 4 j 1 8 r 2 1 6 j 6 j 1 j 9 j 2 3 j 1 1 r 2 2 0 j 1 2 j 2 4 j 3 3 j 2 4 j 3 3 j 2 6 j 2 0 , j 3 0 , j 3 2 c 3 0 3 j 2 1 j 2 7 j 3 1 j 2 9 j 2 8 v s e n c l r c v c c f b v s p l c s s p l s b i c 2 0 1 s s c 3 s 9 0 0 s t n c r e g n c v g h v s v b v g l g n d 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 1 2 3 4 5 6 7 8 9
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 30 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 symbol part type rating recommended sanken parts c304 chip open c305 chip 50 v, 0.22 f, 2012 c308 electrolytic 35 v, 2200 f c309 electrolytic open c604 electrolytic open c605 electrolytic open c606 chip open d202 schottky 40 v, 1 a, sjp sjpb - d4 d203 schottky 40 v, 1 a, sjp sjpb - d4 d204 fast recovery 600 v, 0.5 a, axial ag01a d205 schottky 40 v, 1 a, sjp sjpb - d4 d206 fast recovery 200 v, 1 a, axia l al01z d301 schottky 150 v, 30 a, to220f fmen - 230a d302 schottky 150 v, 30 a, to220f fmen - 230a d303 fast recovery 200 v, 5 a, to220f fml - 14s d304 fast recovery 200 v, 5 a, to220f fml - 14s d601 schottky 40 v, 1 a, sjp sjpb - d4 d602 chip 0 5 %, 1/8 w, 2012 ic201 ic ssc3s901 pc201 photo - coupler pc123 or equiv pc202 photo - coupler pc123 or equiv q201 power mosfet 10 a, 600 v, to220 q202 power mosfet 10 a, 600 v, to220 q204 pnp transistor C 600 m a, C 60 v, sot23 kst2907a q301 shunt regulator v ref = 2.50 v (tl431 or equiv ) q601 pnp transistor 0.6a, C 60v, sot23 q602 npn transistor 0.6 a, 40 v, sot23 q606 npn transistor 0.8 a, 60 v sot - 23/to - 92 r200 chip 47 k 5 %, 1/4 w, 3216 r201 * chip 1.0 m 5 %, 1/4 w, 3216 r202 * chip 1.0 m 5 %, 1/4 w, 3216 r203 * chip 1.0 m 5 %, 1/4 w, 3216 r204 * chip 910 k + 47 k 5 %, 1/4 w, 3216 r205 chip 680 5 %, 1/8 w, 2012 r206 chip 0 5 %, 1/4 w, 3216 r20 8 chip 22 k 5 %, 1/8 w, 2012 r209 chip 47 k 5 %, 1/8 w, 2012 r210 chip 100 5 %, 1/8 w, 2012 r211 chip 2.2 5 %, 1/8 w, 2012 r212 chip 33 k 5 %, 1/8 w, 2012 r213 chip 100 5 %, 1/8 w, 2012 r214 chip 10 k 5 %, 1/8 w, 2012 r215 chip 2.2 5 %, 1/8 w, 2012 r216 chip 47 k 5 %, 1/8 w, 2012 r217 chip 22 k 5 %, 1/8 w, 2012 r218 chip 100 k 5 %, 1/8 w, 2012 r219 chip 2.2 5 %, 1/8 w, 2012 r220 chip 10 k 5 %, 1/8 w, 2012 r221 chip 100 k 5 %, 1/8 w, 2012 r225 chip 150 5 %, 1/8 w, 2012 r230 chip 100 5 %, 1/8 w, 2012 * resistors applied high dc voltage and of high resistance are recommended to select resistors designed against electromigration or use combinations of resistors in series for that to reduce each applied voltage, according to the requirement of the application.
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 31 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 symbol part type rating recommended sanken parts r301 chip 5.6 k 5 %, 1/8 w, 2012 r302 chip 4.7 k 5 %, 1/8 w, 2012 r303 chip 10 k 5 %, 1/8 w, 2012 r304 chip 2.2 k 5 %, 1/8 w, 2012 r305 chip open r306 chip 22 k 5 %, 1/8 w, 2012 r307 chip 20 k 5 %, 1/8 w, 2012 r308 * chip open r309 * chip open r310 chip 1 5 k 5 % , 1/8 w, 2012 r601 chip 1 k 5 %, 1/10 w, 2012 r602 chip 2.2 k 5 %, 1/8 w, 2012 r604 chip 4.7k 5 %, 1/8 w, 2012 r609 chip open r610 chip open r613 * chip open r614 chip 22 k+4.7 k 5 %, 1/8 w, 2012 r615 chip open r616 chip 0 5 %, 1/8 w, 2012 t1 see the specification * resistors applied high dc voltage and of high resistance are recommended to select resistors designed against electromigration or use combinations of resistors in series for that to reduce each applied voltage, according to the requirement of the applicat ion. transformer specification primary inductance, l p : 250 h leakage inductance, lr : 80 h core size : eer - 42 winding specification winding symbol number of turns (t) wire diameter (mm) construction primary winding lp 33 litz 0.1 tiw 0.2 0.1 0.1 0.1 0.1 b o b b i n d s 2 - 1 l p ( 1 ) ( 3 ) ( 4 ) s 2 - 2 : s t a r t a t t h i s p i n c r o s s - s e c t i o n v i e w b o b b i n d l p p r i m a r y s i d e s e c o n d a r y s i d e s 1 - 1 , s 1 - 2 s 2 - 1 , s 2 - 2 c o r e s i d e ( 2 ) ( 1 2 ) ( 1 1 ) ( 1 1 ) ( 1 0 ) s 1 - 1 s 1 - 2 ( 8 ) ( 7 ) ( 6 ) ( 5 ) v s c 2 1 5 / / c 2 1 7 v c c g n d v o u t 1 ( + ) v o u t 1 ( + ) v o u t 1 ( - ) v o u t 1 ( - ) v o u t 2 ( + ) v o u t 2 ( + ) v o u t 2 ( - ) v o u t 2 ( - ) c o r e s i d e
SSC3S900 series SSC3S900 - dsj rev. 2.4 sanken electric co.,ltd. 32 apr. 01, 2 01 6 http://www.sanken - ele.co.jp ? s anken e lectric c o ., l td. 2013 important notes all data, illustrations, graphs , tables and any other information included in this document as to sanken s products listed herein (the sanken products) are current as of the date this document is issued . all contents in this document are subject to any change without notice due to improvement of the sanken products , etc. please make sure to confirm with a sanken sales representative that the contents set forth in this document reflect the latest revisions before use. the sanken products are intended for use as components of general purpose electronic equipment or apparatus (such as home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). prior to use of the sanken product s, please put your signature, or affix your name and seal, on the specification documents of the sanken products and return them to sanken. when considering use of the sanken products for any applications that require high er reliability (such as transporta tion equipment and its control systems, traffic signal control systems or equipment , disaster/crime alarm systems, various safety devices, etc.), you must contact a sanken sales representative to discuss the suitability of such use and put your signature, or affix your name and seal, on the specification documents of the sanken products and return them to sanken, prior to the use of the sanken products. the sanken products are not intended for use in any applications that require extremely high reliability such as: aerospace equipment; nuclear power control systems; and medical equipment or systems, whose failure or malfunction may result in death or serious injury to people, i.e., medical devices in class iii or a higher class as defined by relevant laws of japan (collectively, the specific applications). sanken assumes no liability or responsibility whatsoever for any and all damages and losses that may be suffered by you, users or any third party, resulting from the use of the sanken products in the spec ific applications or in manner not in compliance with the instructions set forth herein. in the event of using the sanken p roducts by either (i) combining other products or materials therewith or (ii) physically, chemically or otherwise processing or treat ing the same , you must duly consider all possible risks that may result from all such uses in advance and proceed therewith at your own responsibility. although sanken is making efforts to enhance the quality and reliability of its products, it is impossible to completely avoid the occurrence of any failure or defect in semiconductor products at a certain rate. you must take, at your own responsibility , preventative measures including using a sufficient safety design and confirming safety of a ny equipment or systems in/for which the sanken products are used, upon due consideration of a failure occurrence rate or derating, etc., in order not to cause any human injury or death, fire accident or social harm which may result from any failure or malfunction of the sanken products. please refer to the relevant specification documents and sanken s official website in relation to derating. no a nti - radioactive ray design ha s been adopted for the sanken p roducts. no contents in this document can be transcribed or copied without sankens prior written consent. the c ircuit constant , operation examples, circuit examples, pattern layout examples, design examples , recommended examples , all information and evaluation result s based thereon, etc., de scribed in this document are presented for the sole purpose of reference of use of the sanken products and sanken assume s no responsibility whatsoever for any and all damages and losses that may be suffered by you, users or any third party, or any possible infringement of any and all property rights including intellectual property rights and any other rights of you, u sers or any third party , result ing from the foregoing . all technical information described in this document (the technical information) is presen ted for the sole purpose of reference of use of the sanken products and no license, express, implied or otherwise, is granted hereby under any intellectual property rights or any other rights of sanken. unless otherwise agreed in writing between sank en and you, sanken makes no warranty of any kind, whether express or implied, including, without limitation, any warranty (i) as to the quality or performance of the sanken products (such as implied warr anty of merchantability, or implied warranty of fitne ss for a particular purpose or special environment), (ii) that any sanken product is delivered free of claims of third parties by way of infringement or the like, (iii) that may arise from course of performance , course of dealing or usage of trade, and (iv ) as to any information contained in this document (including its accuracy, usefulness, or reliability). in the event of using the sanken products, you must use the same after carefully examining all applicable environmental laws and regulations that regul ate the inclusion or use of any particular controlled substances, including , but not limi ted to , the eu rohs directive , so as to be in strict compliance with such applicable laws and regulations . you must not use the sanken products or the technical inform ation for the purpose of any military applications or use, including but not limited to the development of weapons of mass destruction. in the event of exporting the sanken products or the technical information, or providing them for non - residents, you mus t comply with all applicable export control laws and regulations in each country including the u.s. export administration regulations (ear) and the foreign exchange and foreign trade act of japan , and follow the procedures required by such applicable laws and regulations. sanken assumes no responsibility for any troubles, which may occur during the transportation of the sanken products including the falling thereof, out of sankens distribution network. although sanken has prepared this document with its due care to pursue the accuracy thereof, sanken does not warrant that it is error free and sanken assumes no liability whatsoever for any and all damages and losses which may be suffered by you resulting from any possible error s or omissions in connection with the contents included herein . please refer to the relevant specification documents in relation to particular precautions when using the sanken products, and refer to our official website in relation to general instructions and directions for us ing the sanken products. dsgn - 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