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?2005 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.0 features ? floating channel designed for bootstrap operation to +600v. ? lower di/dt gate driver for better noise immunity ? driver current capability: 250ma/500ma ? low start-up and operating current : 120 a, 6.4ma ? under voltage lock out (uvlo) with 1.8v of hysteresis ? programmable preheat time and frequency ? programmable run frequency ? protection from failure to strike ? lamp filament sensing and protection ? automatic restart for lamp exchange ? high accuracy oscillator ? 16-pin sop typical application ? general purpose ballast ic descriptions the fan7532 provides simple and high performance elec- tronic ballast control functions. optimized for an electronic ballast, the fan7532 requires a minimum board area, and reduces component counts. the fan7532 is intended to drive two power mosfets in the classical half-bridge topology with all the features needed to properly drive and control a fluorescent lamp. the fan7532 has many compre- hensive protection features that work through filament fail- ure, failure of a lamp to strike, and automatic restarts. a dedicated timing section in the fan7532 allows the user to set the necessary parameters to preheat, ignite, and run the lamp properly. gnd latch 1.8v c ph vcc r ph r t ho uvlo 11.8v 7 8 5 16 frequency divider & driving logic r q s 6 1.70v 5.15v 6.2i ct ict irt=vref/rt c t lo iph=vref/rph current source current source 2.9v 2.9v irt 5v iph - irt 5v shutdown signal bias current 9v vsup tsd 11 vz 4 10 1.5 hvg driver level shift 1 2.1 s q r q 13 ovp 2v v cph 5v olp 2v vcc 9 10 vb 1 vs 15 olp olp 12 pgnd olp olp : open lamp protection 15.6v fan7532 ballast control ic 16-sop 1
fan7532 2 pin assignments pin definitions pin number pin name pin function description 1 vb high side floating supply voltage 2 n.c. no connection 3 n.c. no connection 4 gnd ground 5 cph preheat time set capacitor 6 ct oscillator frequency set capacitor 7 rph preheat frequency set resistor 8 rt oscillator frequency set resistor 9 ovp over voltage protection, latch mode 10 olp open lamp protection, only output disable mode 11 vcc supply voltage 12 pgnd power ground 13 lo low side gate driver output 14 n.c. no connection 15 vs high side floating supply return 16 ho high side gate driver output 1 2 3 4 16 15 14 13 gnd nc nc vb ho vs nc lo fan7532 5 6 7 8 12 11 10 9 pgnd vcc olp ovp cph ct rph rt
fan7532 3 absolute maximum ratings caution: you must not supply a low impedance voltage source to the internal clamping zener diode that is between the gnd and th e v cc pin of this device. recommended operating conditions temperature characteristics (-25 c ta 125 c) esd level note: esd immunity for all pins , except for condition noted above, is guaranteed up to 2000v (human body model) and 300v (machine model). parameter symbol value unit supply current ( see caution below) i cc 25 ma high side floating supply offset voltage v s v b -25 to v b +0.3 v high side floating supply voltage v b -0.3 to 625 v high side floating output voltage, ho v ho v s -0.3 to v s +0.3 drive output source current i oh 250 ma drive output sink current i ol 500 ma cph, ct, rt, and rph pins input voltage v in -0.3 to 6 v allowable offset voltage slew rate dv s /dt 50 v/ns operating temperature range topr -25 to 125 c storage temperature range tstg -65 to 150 c power dissipation 16-sop pd 0.94 w thermal resistance (junction-to-air) r ja 100 c/w parameter symbol value unit supply voltage vcc 11 to v cl v high side floating offset supply voltage v s 600 v high side floating supply voltage v b v s +11 to v s +20 v high side floating output voltage, ho v ho v s to v b v parameter symbol value unit temperature stability for operating frequency (fos) ? fos(typ) 3 % parameter reference pins conditions level unit human body model (hbm) gnd, cph, ct, rph, rt, ovp, olp, lo vb, vs, ho r=1.5k ? , c=100pf 1000 v machine model (mm) gnd lo c=200pf +250
fan7532 4 electrical characteristics v cc =v bs =14v, ta=25c unless otherwise specified . parameter symbol conditions min. typ. max. unit supply voltage section start threshold voltage v th(st) v cc increasing 11 11.8 12.6 v uvlo hysteresis hy(st) - 0.8 1.8 2.8 v supply clamping voltage v cl icc=12ma 14.7 15.6 16.5 v start-up supply current i st v cc = 10v - 120 180 a operating supply current i cc output not switching - 6.4 9.5 ma dynamic operating supply current: (i cc +i qbs ) i dcc 50khz, c l =1nf - 8.2 10.5 ma oscillator section cph pin charging current 1 i cphl v cph =2v 1 1.5 2 a cph pin charging current 2 i cphh v cph =4v 7.7 10 12.3 a cph pin clamp voltage v clamp - 5.1 5.65 6.2 v preheating frequency f ph v cph =0v, rph=20k ? , ct=1nf 75 85 95 khz preheating dead time t pd v cph =0v, rph=20k ? , ct=1nf 0.75 1.20 1.55 s operating frequency f osc v cph =open, rt=18k ? , ct=1nf 48 50 52 khz operating dead time t od v cph =open, rt=18k ? , ct=1nf 1.5 2 2.3 s differential threshold voltage on ct ? v ct - 3 3.45 4 v ct charging current ich v ct =1.5v 400 460 510 a ct discharging current idisch v ct =5.5v 1.95 2.4 2.8 ma voltage stability ? f/ ? v 12.7v v cc v cl --3% output section low side driver source current i lo1 v lo =vcc 200 250 - ma low side driver sink current i lo2 v lo =gnd 400 500 - ma high side driver source current i ho1 v ho =v b 200 250 - ma high side driver sink current i ho2 v ho =v s 400 500 - ma high/low side rising time tr c l =1nf - 90 150 ns high/low side falling time tf c l = 1nf - 40 100 ns high voltage section offset supply leakage current i lk vb=vs=600v - - 10 a quiescent v bs supply current i qbs -104890 a
fan7532 5 electrical characteristics (continued) vcc=v bs =14v, ta=25c unless otherwise specified. parameter symbol conditions min. typ. max. unit protection section ovp/olp comparator threshold voltage vth_com - 1.8 2 2.3 v olp comparator hysteresis voltage vhy_com - 0.6 0.92 1.3 v latch mode quiescent current ilatch - - 0.35 0.45 ma thermal shutdown junction temperature t sd - - 150 - c
fan7532 6 typical characteristics figure 1. preheating frequency vs. temperature figure 2. operating frequency vs. temperature figure 3. start - up current vs. temperature figure 4. v bs quiescent current vs. temperature figure 5. operating current vs. temperature figure 6. dynamic operating current vs. temperature
fan7532 7 typical characteristics (continued) 5 1015202530354045 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 frequency [khz] rt [kohm] ct=1 nf ct=470 pf 5 1015202530354045 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 frequency [khz] rt [kohm] ct=1 nf ct=470 pf 01 2345 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 frequency [khz] vcph [v] rph=20 kohm rph=10 kohm 01 2345 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 frequency [khz] vcph [v] rph=20 kohm rph=10 kohm figure 7. latch mode current vs. temperature figure 8. ovp detection voltage vs. temperature figure 10. preheating frequency vs. rph figure 9. olp detection voltage vs. temperature figure 11. run frequency vs. rt and ct ct=1nf ct=470pf rph=20k ? rph=10k ?
fan7532 8 application information start-up circuit the start-up current is supplied to the ic through the start-up resistor (rst). to reduce the power dissipation in rst, rst is connected to the full-wave, rectified output voltage. the size of rst can be determined by equations (1) and (2). the size of supply capacitor (cs) is normally determined by the start-up time and the operating current which is built up by the auxiliary operating current source. the turn-off snub- ber capacitor (cq) and two diodes (d1, d2) constitute the auxiliary operating current source for the ic. the charging current through the cq flows into the ic and charges the supply capacitor. if the size of cq is increased, the v cc volt- age on the cs is also increased. under voltage lock out (uvlo) the uvlo mode of the fan7532 is designed to maintain an ultra low supply current of less than 120 a, and to guarantee that the ic is fully functional before two output drivers are activated . oscillator the gate drive output frequency is half that of the triangular waveform on timing capacitor (ct) at pin #6. in normal operating mode, the timing capacitor charging current is 4*irt(=vref/rt). the discharging current is 6.2 times the charging current (5.2*4*irt). during the charging period of the timing capacitor (ct), the mosfet alternatively turns on. during the discharging period of the timing capacitor (ct), both mosfets are off. operating modes the fan7532 has three operating modes according to v cph as shown in figure 14. dc 400v rectifier output cs rst g1 g2 v cc m1 m2 cq d1 d2 zd1 figure 12. start-up circuit r st v in ac () 2 v th st () max , ? i st max , --------------------------------------------------------------------------- = (1) 85 2 12.4 ? 0.18 10 3 ? ------------------------------------- - 599 k ? [] = = r st v in ac max , () 2 v cc ? () 2 r st -------------------------------------------------------------------------- - 0.5 w [] = 2 () r st 2v in ac max , () 2 v cc ? () 2 r st 260 k ? [] 260k r st 599k ? v ct lo ho charging period( ? ? ? ? t ch ) discharging period( ? ? ? ? t dis ) i ch i dis =5.217*i ch 3.5v vref i ch i dis ct dead time figure 13. ct & output waveforms vcc t f pre f run f ign preheating ignition run vth(st) v cph 2.9v 5v f t t f run f pre t ph t sw i cphl =1.5 a i cphh =10 a figure 14. operating modes
fan7532 9 1) preheating mode the preheating mode is defined as the ic?s internal status when the v cph is between 0v and 2.9v. during preheating, the current that flows through the ballast circuit heats the lamp filaments. this is necessary for maximizing lamp life and reducing the required ignition voltage. when the v cc exceeds the uvlo high threshold, the preheating time set-up capacitor, cph, starts being charged by the internal 1.5 a current source until the v cph reaches 2.9v. until the vcph reaches 2.9v the switching frequency throughout the pre- heating mode is determined by ct and rph. the preheating time is determined by the cph and the 1.5 a current source. therefore, the preheating time is determined by equation (3): the preheating frequency is determined by the amount of charging and discharging current to the ct capacitor. the charging and discharging current during preheating mode is decided by equation (4): additionally, the charging and discharging time of the ct capacitor during preheating mode is decided by equation (5): finally, the fan7532?s preheating frequency in the preheat- ing period is determined by equation (6): 2) ignition mode the ignition mode is defined as the ic?s internal status when v cph is approximately between 2.9v and 5v. during igni- tion, the operating frequency is decreased to a pre-deter- mined value. at the same time, a very high voltage for igniting the lamp is established across the lamp. when the v cph exceeds 2.9v, the fan7532 enters the ignition mode. once v cph exceeds 5v, the device enters the run mode described in the following section. in the ignition period, the internal 10ma current source charges the external preheating timing capacitor (cph) in order to increase noise immunity with the sharp slope of the v cph . the ignition time is determined by the cph and inter- nal 10ma current source (dtign=cph*dvcph/icphh). -in this mode, the switching frequency is determined by ct, rph and rt. therefore, the charging and discharging currents change according to v cph are determined by equation (7): 3) run mode after the lamp has successfully ignited, the fan7532 enters run mode. the run mode is defined as the ic?s internal status when v cph is higher than 5v. in this mode, the lamp is being driven with a normal power level after the lamp is dis- charged. the run mode switching frequency is determined by the timing resistor rt and the timing capacitor ct. when the v cph exceeds 5v, the protection-masking mode is disabled and the ic can enter the protection mode. the running fre- quency is determined by the amount of charging and dis- charging current to ct capacitor. the charging and discharging currents during preheating mode are decided by the equation (8): the charging and discharging time of the ct capacitor dur- ing preheating mode is determined by the equation (9): 0v v cph 2.9v << preheating frequency ; i ct i rt i ph i rt ? 5v 2.9v ? () ------------------------------ - 5v 2.9v ? () i ph = + = 2.9v v cph 5v ; frequency sweep << i ct i rt i ph i rt ? 5v 2.9v ? () ------------------------------ - 5v v cph ? () + = v cph 5v run frequency ; i ct i rt = t pre cph = v cph i ch ing arg -------------------------- - (3) i pre_ch 4 v ref r ph ----------- = (4) i pre_disch 4 v ref 6.25 r ph ----------------------------- vref 4v: constant = = i pre_ch c t dv ct i pre_ch ------------------- - = (5) t pre_disch c t dv ct i pre_disch --------------------------- dvct 3.45v: constant = = f pre 1 2t pre_ch t pre_disch + () -------------------------------------------------------------------- - = (6) i ct i rt i rph i rt ? 21 ? ------------------------------- 5v v cph ? () + = 7 () i run_ch 2 v ref r t ----------- = (8) i run_disch 2 v ref 6.25 r t ----------------------- - vref 4v: constant = =
fan7532 10 finally, the preheating frequency in the preheating period using the fan7532 is determined by the equation (10) : protection modes the fan7532 has two types of protection modes. 1) over voltage protection (ovp) mode the ovp pin is normally connected to the external compo- nents that detect lamp voltage between a lamp?s cathodes. this voltage is always maintained under 2v in normal opera- tion. if the lamp enters the end of lamp life or abnormal con- dition, the lamp will not turn on even if there is enough voltage supplied between two cathodes. normally, this con- dition means that one of the cathodes is broken, deactivated, or the lamp is deeply blackened around the cathodes. in this state, the ballast constantly generates very high voltage between two cathodes to ignite according to a specific proce- dure in the control ic. when the voltage of ovp pin exceeds 2v, the ic instantly enters the protection mode. to exit this mode, the v cc must be recycled below the uvlo low threshold. t run_ch c t dv ct i run_ch ------------------- - = (9) t run _disch c t dv ct i run _disch --------------------------- - dvct 3.45v: constant = = f run 1 2t run_ch t run_disch + () -------------------------------------------------------------------- - = 10 () vcc v cph freq v lamp v uvlo+ v uvlo- 5v 2.9v f ph f osc 15.6v ovp ignition fail latched shutdown preheating ignition uvlo preheating ignition run ignition fail level latched shutdown mode is removed after vcc goes down to the uv lo- figure 15. timing diagram (ovp) mode)
fan7532 11 2) open lamp protection (olp) mode after the lamp has successfully ignited, the fan7532 enters run mode. in this mode, if one of the cathodes isn?t correctly connected to the ballast, the ballast should stop operation for safety until the lamp is changed and a new one is connected between the lamp and the ballast. as soon as the voltage of olp pin exceeds 2v, the ic enters the protection mode instantly. however, the fan7532 outputs are only disabled in this mode. to exit protection mode, the lamp must be replaced or correctly connected to the ballast. pcb layout guides component selection and placement on the pcb is very important when using power control ics. bypass the v cc to gnd as close to the ic terminals as possible with a low esr/esl capacitor, as shown in figure 17. this bypassed capacitor can reduce the noise from the power supply parts such as a startup resistor and a charge pump. the gnd lead should be directly connected to the low side power mosfet using an individual pcb trace. in addition, the ground return path of the timing components (cph, ct, rph, rt) and v cc decoupling capacitor should be connected directly to the ic gnd lead and not via separate traces or jumpers to other ground traces on the board. these connection techniques prevent high current ground loops from interfering with sen- sitive timing component operations and allow the entire con- trol circuit to reduce common-mode noise due to output switching. v cph freq v lamp v uvlo+ v uvlo- 5v 2.9v f ph f osc 15.6v olp open lamp run open lamp reset when open lamp only gate driver is disabled preheating ignition preheating ignition run reset when open lamp open lamp only gate driver is disabled open lamp run figure 16. timing diagram (olp mode) figure 17. pcb layout
fan7532 12 typical application circuit f1 ac input 5 6 7 8 out vcc gnd idet inv ea_out mult cs fan7527b 1234 tnr cx1 cy1 cy2 lf1 cx2 ntc d10 c1 r1 r2 c5 c3 r3 r4 l1 c6 r7 r5 r8 d1 r9 c2 m1 d12 d11 d13 dc_400v r6 vr1 r11 1 1 1 1 1 1 1 r12 d2 r10 c4 1 5 3 4 rt ct r51 c52 cph r53 r50 c100//c101 d51 c200//c201 c102 c202 c54 m50 m51 c50 rph l100 l200 dc_400v dc_400v d50 c51 r52 r54 r55 r56 r102 r100, r101 r200, r201 r202 r203 r103 c55 c203 c103 d200 d100 2 2 2 2 2 2 2 2 open lamp detection circuit 15 15 1 1 2 2 2 2 zd51 r57 r104, r105 r106 r204, r205 r206 d101 d201 c57 d3 r13 ignition fail detection circuit r14 d4 zd50 c54 c56 fan7532 gnd vb ho vs lo cph ct rph pgnd vcc olp rt ovp 1 16 15 4 13 5 12 6 11 7 10 8 9 d52 u2 u1
fan7532 13 components list (for wide-range 32w 2 lamps application) part number value note manufacturer input part f1 250v, 3a fuse - cx1 47nf, 275vac box-cap - cx2 150nf, 275vac box-cap - cy1, cy2 2200pf, 3000v y-cap - tnr 470v 471 - ntc 10 ? 10d09 - d10, d11, d12, d13 400v, 1a 1n4004 fairchild lf1 45mh pfc part r1, r2, r8 910k ? ceramic, 1206 - r3 22k ? ceramic, 1206 - r4 22k ? ceramic, 1206 - r5 10 ? ceramic, 1206 - r6 22k ? ceramic, 1206 - r7 0.47 ? 1w - r9 100k ? ceramic, 1206 - r10 2.2k ? ceramic, 1206 - r11 220k ? 1w - r12 150k ? 1w r13 4.7 ? ceramic, 1206 r14 0 ? ceramic, 1206 vr1 10k ? variable resistor - c1 0.22 f, 630v miller-cap - c2 47 f, 450v electrolytic - c3 10 f, 50v electrolytic - c4 105 ceramic, 0805 - c5 102 ceramic, 0805 - c6 105 ceramic, 0805 - l1 0.9mh(80t:6t) ei2820 d1, d4 600v, 1a, ultrafast uf4005 fairchild d2 schottky diode mbr0540 fairchild d3 small signal diode fdll4148 fairchild m1 500v, 6a, power mosfet fqp6n50c, fqpf6n50c fairchild u1 pfc ic fan7527b fairchild
fan7532 14 components list (continued) ballast part part number value note manufacturer r50 390k ? 1w - r51, r53 39 ? ceramic, 1206 - r52, r54 47k ? ceramic, 1206 - r55 5.6 ? 1w - r56, r57 68k ? ceramic, 0805 - rph 27k ? ceramic, 1206 1% rt 18k ? ceramic, 1206 1% r100, r104, r200, r204 910k ? ceramic, 1206 - r101, r105, r201, r205 300k ? ceramic, 1206 - r102, r202 5.1k ? ceramic, 1206 - r103, r203 68k ? ceramic, 1206 - r106, r206 30k ? ceramic, 1206 c50 10 f, 50v electrolytic - c51 105 ceramic, 0805 - c52 104 ceramic, 1206 - c53 681, 630v miller-cap - c54, c55, c56, c57,c103,c203 104 ceramic, 0805 - ct 1nf ceramic, 0805 5% cph 680nf ceramic, 0805 - c100, c101, c200, c201 6.8nf, 630v miller-cap - c102, c202 3.3nf, 1000v miller-cap - l100, l200 3.2mh(120t) ee2820 - m50, m51 500v, 5a, power mosfet fqp5n50c, fqpf5n50c fairchild zd50,zd51 zener diode 1n5245 fairchild d50,d51,d52 600v,1a,ultrafast uf4005 fairchild d100, d101, d200, d201 small signal diode fdll4148 fairchild u2 ballast ic fan7532 fairchild
fan7532 15 mechanical dimensions package dimensions in millimeters/inches 16-sop-225
fan7532 10/28/05 0.0m 001 stock#dsxxxxxxxx ? 2005 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. ordering information product number package operating temperature packing FAN7532M 16-sop -25 c ~ +125 c tube FAN7532Mx tape & reel

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