View IR11672AS-15_8243327.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ir11672a s 1 www.irf.com ? 20 13 international rectifier nov 6 , 2013 advanced smartrectifier tm control ic features ? secondary side high speed sr controller ? dcm, crcm flyback and resonant half - bridge topologies ? 200 v proprietary ic technology ? max 500 khz switching frequency ? anti - bounce logic and uvlo protection ? 7 a peak turn off drive current ? micropower start - up & ultra low quiescent current ? 10.7 v gate drive clamp ? 50ns turn - off propagation delay ? vcc range from 11.3 v to 20 v ? direct sensing of mosfet drain voltage ? enable function synchronized with mosfet vds transition ? cycle by cycle mot check circuit prevents multiple false trigger gate pulses ? lead - free ? compatible with 0.3 w standby, energy star, cecp, etc. typical applications ? lcd & pdp tv, teleco m smps, ac - dc adapters, atx smps, server smps product summary topology flyback, resonant half - bridge vd 200 v v out 10.7 v i o+ & i o - (typ .) +2 a & - 7 a turn on propagation delay (typ.) 60 ns turn off propagation delay (typ.) 50 ns package options 8 - lead soic ordering information base part number package type standard pack complete part number form quantity ir116 7 2 a s soic8 n tube/bulk 95 ir 1167 2 a spbf tape and reel 25 00 ir 1167 2 a strpbf
ir11672a s 2 www.irf.com ? 20 13 international rectifier nov 6 , 2013 typical connection diagram ir11672as rmot cdc rg vd 5 vs 6 mot 3 ovt 2 en 4 gnd 7 vgate 8 vcc 1 u1 ir11671 q1 xfm co load rdc vin rtn ci rs cs
ir11672a s 3 www.irf.com ? 20 13 international rectifier nov 6 , 2013 table of contents page ordering information 1 description 4 absolute maximum ratings 5 e lectrical characteristics 6 functional block diagram 8 input / output pin equivalent circuit diagram 9 lead definitions 1 0 lead assignments 1 0 detailed pin description 11 application information and additional details 1 2 package details 2 3 tape and reel details 2 4 part marking information 2 5 qualification information 2 6
ir11672a s 4 www.irf.com ? 20 13 international rectifier nov 6 , 2013 description ir11672a is a smart secondary - side driver ic designed to drive n - channel power mosfets used as synchronous rectifiers in isolated flyback and resonant half - bridge converters. the ic can control one or more paralleled n - mosfets to emulate the behavior of schottky diode rectifi ers. the drain to source voltage is sensed differentially to determine the polarity of the current and turn the power switch on and off in proximity of the zero current transition. the cycle - by - cycle mot protection circuit can automatically detect no load condition and turn off gate driver output to avoid negative current flowing through the mosfets. ruggedness and noise immunity are accomplished using an advanced blanking scheme and double - pulse suppression which allow reliable operation in all operating m odes.
ir11672a s 5 www.irf.com ? 20 13 international rectifier nov 6 , 2013 absolute maximum ratings absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. all voltage parameters are absolute voltages referenced to com, all currents are defined positive into any lead. the thermal resistance and power dissipation ratings are measured under board mounted and still air conditions. parameters symbol min. max. units remarks supply voltage v cc - 0.3 20 v enable voltage v en - 0.3 20 cont. drain sense voltage v d - 3 200 pulse drain sense voltage v d - 5 200 source sense voltage v s - 3 20 gate voltage v gate - 0.3 20 v cc =20v, gate off operating junction temperature t j - 40 150 c storage temperature t s - 55 150 thermal resistance r 128 c/w soic - 8 package power dissipation p d 970 mw soic - 8, t amb =25c switching frequency fsw 500 khz recommended operating conditions for proper operation the device should be used within the recommended conditions. symbol definition min. max. units v cc supply voltage 11.4 18 v v d drain sense voltage - 3 200 t j junction temperature - 25 125 c fsw switching frequency --- 500 khz recommended component values symbol component min. max. units r mot mot pin resistor value 5 75 k :
ir11672a s 6 www.irf.com ? 20 13 international rectifier nov 6 , 2013 electrical characteristics v cc =15 v and t a = 25 c unless otherwise specified. the output voltage and current (v o and i o ) parameters are referenced to gnd (pin7). supply section parameters symbol min. typ. max. units remarks supply voltage operating range v cc 11.4 18 v gbd v cc turn on threshold v cc on 9.8 10.5 5 11.3 v cc turn off threshold v cc uvlo 8.4 9 9.7 (under voltage lock out) v cc turn on/off hysteresis v cc hyst 1.55 operating current i cc 8.5 10 ma c load =1nf, f sw = 400khz 50 65 c load =10nf, f sw = 400khz quiescent current i qcc 1.8 2.2 start - up current i cc start 100 200 a v cc =v cc on - 0.1v sleep current i sleep 150 200 v en =0v, v cc =15v enable voltage high v enhi 2.1 5 2.70 3.2 v enable voltage low v enlo 1.2 1.6 2.0 enable pull - up resistance r en 1.5 m : gbd comparator section parameters symbol min. typ. max. units remarks turn - off threshold v th1 - 7 - 3.5 0 mv ovt = 0v, v s =0v - 14 - 9 .5 - 6 ovt floating, v s =0v - 22 - 18 - 14 ovt = vcc, v s =0v turn - on threshold v th2 - 150 - 50 hysteresis v hyst 55 input bias current i ibias1 1 7.5 a v d = - 50mv i ibias2 30 100 v d = 200v comparator input offset v offset 2 mv gbd input cm voltage range v cm - 0.15 2 v one - shot section parameters symbol min. typ. max. units remarks blanking pulse duration t blank 9 17 25 s reset threshold v th3 2.5 v v cc =10v C gbd 5.4 v cc =20v C gbd hysteresis v hyst3 40 mv v cc =10v C gbd
ir11672a s 7 www.irf.com ? 20 13 international rectifier nov 6 , 2013 electrical characteristics v cc =15 v and t a = 25 c unless otherwise specified. the output voltage and current (v o and i o ) parameters are referenced to gnd (pin7). minimum on time section parameters symbol min. typ. max. units remarks minimum on time t o n min 190 240 290 ns r mot =5k : v cc =12v 2.48 3 .1 3.72 s r mot =75k : v cc =12v gate driver section parameters symbol min. typ. max. units remarks gate low voltage v glo 0.3 0.5 v i gate = 200ma gate high voltage v gth 9.0 10.7 12.5 v cc =12v - 18v (internally clamped) rise time t r1 18 ns c load = 1nf, v cc =12v t r2 125 c load = 10nf, v cc =12v fall time t f1 10 c load = 1nf, v cc =12v t f2 30 c load = 10nf, v cc =12v turn on propagation delay t don 60 95 v ds to v gate - 100mv overdrive turn off propagation delay t doff 5 0 75 v ds to v gate - 100mv overdrive pull up resistance r up 4 : i gate = 1a C gbd pull down resistance r down 0.7 i gate = - 200ma output peak current (source) i o source 2 a c load = 10nf C gbd output peak current (sink) i o sink 7
ir11672a s 8 www.irf.com ? 20 13 international rectifier nov 6 , 2013 functional block diagram u v l o & r e g u l a t o r v d v c c v t h 1 g n d e n v g a t e v s v t h 3 v t h 1 v t h 2 v t h 3 v g a t e v d s m o t o v t v c c m i n o f f t i m e r e s e t m i n o n t i m e r e s e t d r i v e r v c c c y c l e b y c y c l e m o t c h e c k c i r c u i t
ir11672a s 9 www.irf.com ? 20 13 international rectifier nov 6 , 2013 i/o pin equivalent circuit diagram v c c g n d m o t o v t e s d d i o d e e s d d i o d e r e s d v c c g n d e n e s d d i o d e e s d d i o d e r e s d v d g n d e s d d i o d e 2 0 0 v d i o d e r e s d v c c g n d g a t e e s d d i o d e e s d d i o d e
ir11672a s 10 www.irf.com ? 20 13 international rectifier nov 6 , 2013 lead definitions pin# symbol description 1 v cc supply voltage 2 ovt offset voltage trimming 3 mot minimum on time 4 en enable 5 vd fet drain sensing 6 vs fet s o urce sensing 7 gnd ground 8 v gate gate drive output lead assignments v d g n d v g a t e v s v c c m o t e n o v t 4 3 2 1 5 6 7 8 i r 1 1 6 7 2 s
ir11672a s 11 www.irf.com ? 20 13 international rectifier nov 6 , 2013 detailed pin description vcc: power supply this is the supply voltage pin of the ic and it is monitored by the under voltage lockout circuit. it is possible to turn off the ic by pulling this pin below the minimum turn off threshold voltage, without damage to the ic. to prevent noise problems, a bypass ceramic capacitor connected to vcc and com should be placed as close as possible to the ir1167 2a . this pin is internally clamped. ovt: offset voltage trimming the ovt pin will program the amount of input offset voltage for the turn - off threshold v th1 . the pin can be optionally tied to ground, to vcc or left floating, to select 3 ranges of input offset trimming. this programming feature allows for accommodating different r d s on mosfets. mot: minimum on time the mot programming pin controls the amoun t of minimum on time. once v th2 is crossed for the first time, the gate signal will become active and turn on the power fet. spurious ringings and oscillations can trigger the input comparator off. the mot blanks the input comparator keeping the fet on for a minimum time. the mot is programmed between 200ns and 3us (typ.) by using a resistor referenced to com. en: enable this pin is used to activate the ic sleep mode by pulling the voltage level below
ir11672a s 12 www.irf.com ? 20 13 international rectifier nov 6 , 2013 application information and additional details state diagram uvlo/sleep mode the ic remains in the uvlo condition until the voltage on the vcc pin exceeds the vcc turn on threshold voltage, v cc on . during the time the ic remains in the uvlo state, the gate drive circuit is inactive and the ic draws a quiescent current of i cc start . the uvlo mode is accessible from any other state of operation whenever the ic supply voltage condition of vcc < v cc uvlo occurs. the sleep mode is initiated by pulling the en pin below 1.6 v (typ). in this mode the ic is essentially shut down and draws a very low quiescent supply current. normal mode and synchronized enable function the ic enters in normal operating mode once the uvlo voltage has been exceeded and the en voltage is above v enhi threshold . when the ic enters the normal mode from the uvlo mode , the gate output is dis a bled (stays low) un til v ds exceeds v th3 to activate the gate. this ensure s that the gate output is not e nabled in the middle of a switching cycle. this logic prevents any reverse currents across the device due to the minimum on time function in the ic. the gate will continuously drive the sr mosfet after this one - time activation. the cycle by cycle mot protection circuit is ena bled in normal mode. mot protection mode if the secondary current conduction time is shorter than the mot (minimum on time) setting, the next driver output is disabled. this function can avoid reverse current that occurs when the system works at very low duty - cycles or at very light/no load condi tions and reduce system standby power consumption by disabling gate outputs. the cycle by cycle mot check circuit is always activated under normal mode and mot protection mode, so that the ic can automatically resume normal operation once the load increase s to a level and the secondary current conduction time is longer than mot. p o w e r o n g a t e i n a c t i v e u v l o m o d e v c c < v c c o n g a t e i n a c t i v e i c c m a x = 2 0 0 u a n o r m a l g a t e a c t i v e g a t e p w
ir11672a s 13 www.irf.com ? 20 13 international rectifier nov 6 , 2013 general description the ir1167 2a smart rectifier ic can emulate the operation of diode rectifier by properly driving a synchronous rectifier (sr) mosfet. the direction of the re ctified current is sensed by the input comparator using the power mosfet r d s on as a shunt resistance and the gate pin of the mosfet is driven accordingly. internal blanking logic is used to prevent spurious transitions and guarantee operation in continuous (ccm), discontinuous (dcm) and critical (crcm) conduction mode. ir11672a is suitable for flyback and resonant half - bridge topologies. figure 1 : input comparator thresholds flyback application the modes of operation for a flyback circuit differ mainly for the turn - off phase of the sr switch, while the turn - on phase of the secondary switch (which corresponds to the turn off of the primary side switch) is identical. turn - on phase when the conduction phase of the sr fet is initiated, current will start flowing through its body diode, generating a negative v ds voltage across it. the body diode has generally a much higher voltage drop than the one caused by the mosfet on resistance and therefore will trigger the turn - on threshold v th2 . at that point the ir1167 2a will drive the gate of mosfet on which will in turn cause the conduction voltage vds to drop down. this drop is usually accompanied by some amount of ringing, that can trigger the input comparator to turn off; hence, a minimum on time (mot ) blanking period is used that will maintain the power mosfet on for a minimum amount of time. the programmed mot will limit also the minimum duty cycle of the sr mosfet and, as a consequence, the max duty cycle of the primary side switch. dcm/crcm turn - o ff phase once the sr mosfet has been turned on, it will remain on until the rectified current will decay to the level where v ds will cross the turn - off threshold v th1 . this will happen differently depending on the mode of operation. in dcm the current wil l cross the threshold with a relatively low di/dt. once the threshold is crossed, the current will start flowing again thru the body diode, causing the v ds voltage to jump negative. depending on the amount of residual current, v ds may trigger once again the turn on threshold: for this reason v th2 is blanked for a certain amount of time (t blank ) after v th1 has been triggered. the blanking time is internally set. as soon as v ds crosses the positive threshold v th3 also the blanking ti me is terminated and the ic is ready for next conduction cycle. v gate v th 1 v th 2 v th 3 v ds
ir11672a s 14 www.irf.com ? 20 13 international rectifier nov 6 , 2013 figure 2 : primary and secondary currents and voltages for dcm mode figure 3 : primary and secondary currents and voltages for crcm mode ccm turn - off phase in ccm mode the turn off transition is much steeper and di/dt involved is much higher. the turn on phase is identical to dcm or crcm and therefore wont be repeated here. i prim i sec v sec v prim time time t 1 t 2 t 3 i prim i sec v sec v prim time time t 1 t 2
ir11672a s 15 www.irf.com ? 20 13 international rectifier nov 6 , 2013 figure 4 : primary and secondary currents and voltages for ccm mode the operation waveforms of ir11672a i n a flyback converter under ccm mode and dcm/crcm were shown in figure 5 and figure 6 respectively. figure 5 : s econdary side ccm operation i prim i sec v sec v prim time time t 1 t 2 i sec v ds time time t 1 t 2 v th 1 v th 2 v th 3 blanking mot time gate drive
ir11672a s 16 www.irf.com ? 20 13 international rectifier nov 6 , 2013 figure 6 : s econdary side d cm /crcm operation resonant half - bridge application the typical application circuit of ir11672a in llc half - bridge is shown in figure 7. figure 7: resonant half - bridge application circuit in resonant half - bridge converter, the turn - on phase and turn - off phase is similar to flyback except the current shape is sinusoid. the typical operation waveform can be found below. gate drive i sec v ds blanking time time t 1 t 2 v th 1 v th 2 v th 3 10 us blanking mot rmot2 cvcc2 rcc2 rmot1 cvcc1 rcc1 vcc 1 ovt 2 mot 3 en 4 gate 8 gnd 7 vs 6 vd 5 ir11672a lr t1 cout m2 lm m1 vin cr rtn m3 m4 rg1 vout vcc 1 ovt 2 mot 3 en 4 gate 8 gnd 7 vs 6 vd 5 ir11672a rg2
ir11672a s 17 www.irf.com ? 20 13 international rectifier nov 6 , 2013 figure 8: resonant half - bridge operation waveform mot protection mode the mot protection prevents reverse current in sr mosfet which could happen at light load if the mot time is set very long. the ic disables the gate output in the protection mode and automatically resume to normal operation as the load increasing to a leve l where the sr current conduction time is longer than mot. this function works in both flyback and resonant half - bridge topologies. figure 9 is an example in flyback converter. figure 9: mot protection mode g a t e d r i v e v d s b l a n k i n g t i m e t 1 t 2 v t h 1 v t h 2 v t h 3 m o t t b l a n k i d s t i m e i s e c v d s g a t e d r i v e m o t s e n s e d v d > v t h 1 a t t h e e n d o f m o t d i s a b l e t h e n e x t g a t e o u t p u t
ir11672a s 18 www.irf.com ? 20 13 international rectifier nov 6 , 2013 synchronized enable function sync enable function guarantees the vgate always starts switching at the beginning of a switching cycle. this function works in both flyback and resonant half - bridge topologies. figure 10 is an example in resonant half - bridge converter. figure 10: synchronized enable function (resonant half - bridge) general timing waveform figure 11: vcc uvlo figure 12 a : timing waveform v d s i d r a i n v g a t e u v l o & e n i c a c t i v a t e d i n t h e m i d d l e o f a c o n d u c t i o n c y c l e , v g a t e s t a y s l o w . v g a t e h a s o u t p u t f r o m t h e n e x t c y c l e v t h 3 v d > v t h 3 , g a t e a c t i v a t e d t vcc vcc on uvlo vcc uvlo normal uvlo 10 % 90 % t rise v th 2 t fall v th 1 t doff t don 50 % v ds v gate
ir11672a s 19 www.irf.com ? 20 13 international rectifier nov 6 , 2013 figure 12b: enable timing waveform v e n e n p o s i t i v e p u l s e w i d t h v e n h i v e n l o e n n e g a t i v e p u l s e w i d t h
ir11672a s 20 www.irf.com ? 20 13 international rectifier nov 6 , 2013 figure 13: supply current vs. supply voltage figure 14: undervoltage lockout vs. temperature figure 15: icc quiescent cur rent vs. temperature figure 16: icc supply currrent @1nf load vs. temperature 0.01 0.1 1 10 5 v 10 v 15 v 20 v i supply (ma) supply voltage 8.0 v 8.5 v 9.0 v 9.5 v 10.0 v 10.5 v 11.0 v -50 c 0 c 50 c 100 c 150 c vcc uvlo thresholds temperature vcc on vcc uvlo 1.0 1.2 1.4 1.6 1.8 2.0 -50 c 0 c 50 c 100 c 150 c i cc supply current (ma) temperature i qcc 7.5 7.7 7.9 8.1 8.3 8.5 -50 c 0 c 50 c 100 c 150 c i cc supply current (ma) temperature icc @400khz, c load =1nf
ir11672a s 21 www.irf.com ? 20 13 international rectifier nov 6 , 2013 figure 17: v th1 vs. temperature figure 18: v th2 vs. temperature figure 19: comparator hysteresis vs. temperature figure 20: v th1 vs. temperature and common mode (ovt=floating) -30.0 -25.0 -20.0 -15.0 -10.0 -5.0 0.0 -50 c 0 c 50 c 100 c 150 c v th1 threshold (mv) temperature ovt=gnd ovt=floating ovt=vcc -150.0 -100.0 -50.0 0.0 -50 c 0 c 50 c 100 c 150 c v th2 thresholds (mv) temperature 0.0 25.0 50.0 75.0 100.0 -50 c 0 c 50 c 100 c 150 c comparator hysteresis v hyst (mv) temperature -11.2 -11.0 -10.8 -10.6 -10.4 -10.2 -10.0 -9.8 -9.6 -9.4 -9.2 -9.0 -50 c 0 c 50 c 100 c 150 c v th1 threshold (mv) temperature vs=-150mv vs=0v vs=+2v
ir11672a s 22 www.irf.com ? 20 13 international rectifier nov 6 , 2013 figure 21 : v th2 vs. temperature and common mode figure 22 : mot vs temperature figure 23 : enable threshold vs. temperature figure 2 4 : turn - on and turn - off propagation delay vs. temperature -90.0 -85.0 -80.0 -75.0 -70.0 -65.0 -60.0 -55.0 -50.0 -50 c 0 c 50 c 100 c 150 c v th1 threshold (mv) temperature vs=-150mv vs=0v vs=+2v 0 us 1 us 2 us 3 us 4 us -50 c 0 c 50 c 100 c 150 c minimum on time (us) temperature rmot=5k rmot=75k 1.0 v 1.5 v 2.0 v 2.5 v 3.0 v -50 c 0 c 50 c 100 c 150 c enable thresholds temperature ven hi ven lo 35 ns 40 ns 45 ns 50 ns 55 ns 60 ns 65 ns 70 ns 75 ns 80 ns -50 c 0 c 50 c 100 c 150 c propagation delay temperature turn-on propagation delay turn-off propagation delay
ir11672a s 23 www.irf.com ? 20 13 international rectifier nov 6 , 2013 package details: soic8n
ir11672a s 24 www.irf.com ? 20 13 international rectifier nov 6 , 2013 tape and reel details: soic 8n e f a c d g a b h note : controlling dim ension in m m loaded tape feed direction a h f e g d b c carrier tape dimension for 8soicn code min max min max a 7.90 8.10 0.311 0.318 b 3.90 4.10 0.153 0.161 c 11.70 12.30 0.46 0.484 d 5.45 5.55 0.214 0.218 e 6.30 6.50 0.248 0.255 f 5.10 5.30 0.200 0.208 g 1.50 n/a 0.059 n/a h 1.50 1.60 0.059 0.062 metric imperial reel dimensions for 8soicn code min max min max a 329.60 330.25 12.976 13.001 b 20.95 21.45 0.824 0.844 c 12.80 13.20 0.503 0.519 d 1.95 2.45 0.767 0.096 e 98.00 102.00 3.858 4.015 f n/a 18.40 n/a 0.724 g 14.50 17.10 0.570 0.673 h 12.40 14.40 0.488 0.566 metric imperial
ir11672a s 25 www.irf.com ? 20 13 international rectifier nov 6 , 2013 part marking information n o n - l e a d f r e e r e l e a s e d 1 1 6 7 2 a i r l o g o y w w ? p a r t n u m b e r d a t e c o d e p i n 1 i d e n t i f i e r l o t c o d e ( p r o d m o d e C a s s e m b l y s i t e c o d e p e r s c o p 2 0 0 - 0 0 2 c x x x x m a r k i n g c o d e l e a d f r e e r e l e a s e d ? p
ir11672a s 26 www.irf.com ? 20 13 international rectifier nov 6 , 2013 qualification information ? qualification level industrial ?? &rpphqwv 7klv idplo\ ri ,&v kdv sdvvhg-('(&?v,qgxvwuldo txdolilfdwlrq ,5?v &rqvxphu txdolilfdwlrq ohyho lv judqwhg e\ extension of the higher industrial level. moisture sensitivity level msl2 ??? 260c (per ipc/jedec j - std - 020) esd machine model class b (per jedec standard jesd22 - a115) human body model class 2 (per eia/jedec standard eia/jesd22 - a114) ic latch - up test class i, level a (per jesd78) rohs compliant yes ? 4xdolilfdwlrqvwdqgdugvfdqehirxqgdw,qwhuqdwlrqdo5hfwlilhu?vzhevlwh http://www.irf.com/ ?? higher qualification ratings may be available should the user have such requirements. please contact your international rectifier sales representative for further information. ??? higher msl ratings may be available for the specific package types listed here. please contact your international rectifier sales representative for further information. the information provided in this document is believed to be accurate and reliable. however, international rectifier assumes n o responsibility for the consequences of the use of this information. international rectifier assumes no responsibility for any in fringement of patents or of other rights of third parties which may result from the use of this information. no license is granted by implication or oth erwise under any patent or patent rights of international rectifier. the specifications mentioned in t his document are subject to change without notice. this document supersedes and replaces all information previously supplied. )ruwhfkqlfdovxssruwsohdvhfrqwdfw,5?v7hfkqlfdo$vvlvwdqfh&hqwhu http://www.irf.com/technical - info/ world headquarters: 233 kansas st., el segundo, california 90245 tel: (310) 252 - 7105

▲Up To Search▲

Price & Availability of IR11672AS-15

	To Download IR11672AS-15 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .