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? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 dual-output, critical conduction mode pfc controller february 2007 fan7528 rev. 1.0.6 fan7528 dual-output, critical cond uction mode pfc controller features ? low total harmonic distortion (thd) ? dual output voltage control ? precise adjustable output over-voltage protection ? open-feedback protection and disable function ? zero current detector ? 160s internal start-up timer ? mosfet over-current protection ? under-voltage lockout with 3.5v hysteresis ? low start-up (40a) and operating current (1.5ma) ? totem-pole output with high state clamp ? 400ma peak gate drive current ? 8-pin dip or 8-pin sop applications ? adapter related application notes ? an-6012 : design of power factor correction circuit using fan7528 description the fan7528 is an active power factor correction (pfc) controller for boost pfc applications that operates in critical conduction mode (crm). it uses voltage mode pwm that compares an internal ramp signal with the error amplifier output to generate mosfet turn-off sig- nal. because the voltage mode crm pfc controller does not need the rectified ac line voltage information, it can save the power loss of the input voltage sensing network necessary for the current mode crm pfc controller. the fan7528 provides the dual-output voltage control function without the ac li ne voltage sensing for adapter applications. it changes the pfc output voltage accord- ing to the ac line voltage. it provides protection functions such as over-voltage pro- tection, open-feedback protec tion, over-current protec- tion, and under-voltage lockout protection. the fan7528 can be disabled if the inv pi n voltage is lower than 0.45v and the operating current decreases to 65a. using a new variable on-time contro l method, thd is lower than the conventional crm boost pfc ics. ordering information part number operating temp. range pb-free package packing method marking code fan7528n -40 c to +125 c yes 8-dip rail fan7528 fan7528m -40 c to +125 c yes 8-sop rail fan7528 FAN7528MX -40 c to +125 c yes 8-sop tape & reel fan7528
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 2 typical appli cation diagrams figure 1. typical boost pfc application internal block diagram figure 2. functional block diagram of fan7528 gnd zcd inv v cc ac in v o comp fan7528 cs mot r1 r2 ld c o n aux v aux r zcd fan7528 rev. 1.01 inv error amplifier ovp comp 8pf 40k 2.5v ref internal bias 160 s timer v cc zcd cs uvlo 6.7v 12v 8.5v 2.66v 2.55v ocp comparator 1v offset mot gnd sawtooth generator zero current detector r s q 3 6 4 5 2 1 8 dual-output reference generator 1.5v/2.5v gm v ref 0.8v disable 0.45v 0.35v disable 1.5v 1.4v 7 vcc out drive output 13v v cc =8.5v reference set v cc =4.5v reference reset ramp signal 1v ~ 5v range fan7528 rev. 1.00
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 3 pin assignments figure 3. pin configuration (top view) pin definitions pin # name description 1inv this pin is the inverting input of the error am plifier. the output voltage of the boost pfc converter should be resistively divided to 2.5v at the high line condition and connected to this pin. if this pin voltage is co ntrolled to be lower than 0.45v, the device is disabled. 2comp this pin is the output of t he transconductance error amplifier. some components for the output voltage compensation should be connected between this pin and gnd. 3mot this pin is used to set the slope of the internal ramp. the voltage of this pin is maintained to be 1v. if a resistor is connected between this pin and gnd, current flows out of the pin and the slope of the internal ramp is proportional to this current. 4cs this pin is the input of the over-current protection comparator. the mosfet current is sensed using a sensing resistor and the resulting voltage is applied to this pin. an internal rc filter is included to filter sw itching noise. this pin is sensitive to the negative voltage below -0.3v. for proper oper ation, the stray inductance in the sensing path and the inductance of the sensing resistor must be minimized. 5zcd this pin is the input of the zero current de tection block. if the voltage of this pin goes higher than 1.5v, then lower than 1.4v, the mosfet is turned on. 6gnd this pin is used for the ground potential of al l the pins. for proper operation, the signal ground and the power ground should be separated. 7out this pin is the gate drive output. the p eak sourcing and sinking current level is 400ma. for proper operation, the stray inductance in the gate driving path must be minimized. 8v cc this pin is the ic supply pin. ic current and mosfet drive current are supplied using this pin. fan7528 6 5 8 7 v cc out gnd zcd 1 2 3 4 comp cs mot inv www fan7528 rev. 1.00
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 4 absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be opera- ble above the recommended operating conditions and stressing the parts to these levels is not recommended. in addi- tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. t a = 25c unless otherwise specified. thermal impedance note: 1. regarding the test environment and pcb type, please refer to jesd51-2 and jesd51-10. symbol parameter value unit v cc supply voltage 23 v i oh , i ol peak drive output current 400 ma i clamp driver output clamping diodes v o > v cc or v o < -0.3v 10 ma i det detector clamping diodes 10 ma v in error amp, mot, cs input voltages -0.3 to 6 v t j operating junction temperature 150 c t a operating temperature range -40 to 125 c t stg storage temperature range -65 to 150 c esd human body model 2.0 kv machine model 300 v symbol parameter value unit ja thermal resistance, junction-to-ambient 8-dip 110 c/w 8-sop 150 c/w
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 5 electrical characteristics v cc = 14v, t a = -40 c~125 c, unless otherwise specified. symbol parameter condition min. typ. max. unit under-voltage lockout section v th(start) start threshold voltage v cc increasing 11 12 13 v v th(stop) stop threshold voltage v cc decreasing 8.0 8.5 9.0 v hy(uvlo) uvlo hysteresis 3.0 3.5 4.0 v supply current section i st start-up supply current v cc = v th(start) ? 0.2v 40 70 a i cc operating supply current ou tput no switching 1.5 3.0 ma i dcc dynamic operating supply current 50khz, c l =1nf 2.5 4.0 ma i cc(dis) operating current at disable v inv = 0v 40 65 90 a error amplifier section v ref1 voltage feedback input threshold1 t a = 25 c 2.465 2.500 2.535 v 2.435 2.500 2.565 v v ref2 voltage feedback input threshold2 1.45 1.50 1.55 v v ref1 line regulation v cc = 14v~23v 0.1 10.0 mv v ref3 temperature stability of v ref1 (1) 20 mv i b(ea) input bias current v inv = 1v~4v -0.5 0.5 a i source output source current v inv = 2.4v -12 a i sink output sink current v inv = 2.6v 12 a v eao(h) output upper clamp voltage 4.5 5.5 6.5 v v eao(z) zero duty cycle output voltage 0.7 1.0 1.3 v gm transconductance (1) 90 115 140 mho v th(in) output voltage selection threshold t a = 25 c 1.24 1.30 1.36 v v th(reset) output voltage reset threshold (1) 3.0 4.5 6.0 v maximum on-time section v mot maximum on-time voltage r mot = 13.7k 0.95 1.00 1.05 v t on -max maximum on-time programming r mot = 13.7k, t a = 25 c 18.0 22.5 27.0 s current sense section v cs(limit) current sense input threshold voltage limit 0.7 0.8 0.9 v i b(cs) input bias current v cs = 0v~1v -1.0 -0.1 1.0 a t d(cs) current sense delay to output (1) 350 500 ns
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 6 electrical characteristics (continued) v cc = 14v, t a = -40 c~125 c, unless otherwise specified. note: 1. these parameters, although guaranteed by design, are not tested in production. symbol parameter condition min. typ. max. unit zero current detection section v th(zcd) input voltage threshold (1) 1.35 1.50 1.65 v hy (zcd) detect hysteresis (1) 0.05 0.10 0.15 v v clamp(h) input high clamp voltage i det = 3ma 6.0 6.7 7.4 v v clamp(l) input low clamp voltage i det = -3ma 0 0.6 1.0 v i b(zcd) input bias current v zcd = 1v~5v -1.0 -0.1 1.0 a i source(zcd) source current capability (1) -10 ma i sink(zcd) sink current capability (1) 10 ma t dead maximum delay from zcd to output turn-on (1) 100 200 ns output section v oh output voltage high i o = -100ma 9.2 11.0 12.8 v v ol output voltage low i o = 100ma 1.0 2.5 v t r rising time (1) c l = 1nf 50 100 ns t f falling time (1) c l = 1nf 50 100 ns v o(max) maximum output voltage v cc = 20v, i o = 100 a 11.5 13.0 14.5 v v o(uvlo) output voltage with uvlo activated v cc = 5v, i o = 100 a1v restart timer section t d(rst) restart timer delay 40 160 360 s over-voltage protection section v ovp ovp threshold voltage t a = 25 c 2.60 2.66 2.72 v hy(ovp) ovp hysteresis 0.06 0.11 0.16 v enable section v th(en) enable threshold voltage 0.40 0.45 0.50 v hy(en) enable hysteresis 0.05 0.10 0.15 v
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 7 typical performance characteristics figure 4. start threshold voltage vs. temp. f igure 5. stop threshold voltage vs. temp. figure 6. uvlo hysteresis vs. temp. figure 7. start-up supply current vs. temp. figure 8. operating supply current vs. temp. f igure 9. dynamic operating current vs. temp. -60 -40 -20 0 20 40 60 80 100 120 140 11.2 11.6 12.0 12.4 12.8 v th(start) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 7.6 8.0 8.4 8.8 9.2 v th(stop) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 3.0 3.2 3.4 3.6 3.8 4.0 hy(uvlo) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0 10 20 30 40 50 60 70 i st [ a] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.0 0.5 1.0 1.5 2.0 2.5 3.0 i cc [ma] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 i dcc [ma] temperature [c]
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 8 typical performance characteristics (continued) figure 10. i cc at disable vs. temp. figure 11. v ref1 vs. temp. figure 12. v ref2 vs. temp. figure 13. input bias current vs. temp. figure 14. error amp. source cu rrent vs. temp. figure 15. error amp. sink current vs. temp. -60 -40 -20 0 20 40 60 80 100 120 140 40 50 60 70 80 90 i cc(dis) [ a] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 2.44 2.46 2.48 2.50 2.52 2.54 2.56 v ref1 [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 1.46 1.48 1.50 1.52 1.54 v ref2 [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 -0.4 -0.2 0.0 0.2 0.4 i b(ea) [ a] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 -18 -15 -12 -9 -6 i source [ a] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 6 9 12 15 18 i sink [ a] temperature [c]
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 9 typical performance characteristics (continued) figure 16. error amp. clamp voltage vs. temp. figure 17. zero duty output voltage vs. temp. figure 18. output select threshold vs. temp. figure 19. mot pin voltage vs. temp. figure 20. maximum on-time vs. temp . figure 21. current limit vs. temp. -60 -40 -20 0 20 40 60 80 100 120 140 4.5 5.0 5.5 6.0 6.5 v eao(h) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.7 0.8 0.9 1.0 1.1 1.2 1.3 v eao(z) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 1.24 1.26 1.28 1.30 1.32 1.34 1.36 v th(in) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.96 0.98 1.00 1.02 1.04 v mot [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 18 20 22 24 26 t on(max) [ s] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.72 0.76 0.80 0.84 0.88 v cs(limit) [v] temperature [c]
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 10 typical performance characteristics (continued) figure 22. cs input bias current vs. temp. f igure 23. zcd input high clamp vs. temp. figure 24. zcd input low clamp vs. temp. figure 25. zcd input bias current vs. temp. figure 26. output voltage high vs. temp. figure 27. output voltage low vs. temp. -60 -40 -20 0 20 40 60 80 100 120 140 -0.9 -0.6 -0.3 0.0 0.3 0.6 0.9 i b(cs) [ a] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 6.0 6.2 6.4 6.6 6.8 7.0 7.2 7.4 v clamp(h) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.0 0.2 0.4 0.6 0.8 1.0 v clamp(l) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 -0.8 -0.4 0.0 0.4 0.8 i b(zcd) [ a] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 9.5 10.0 10.5 11.0 11.5 12.0 12.5 v oh [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.0 0.5 1.0 1.5 2.0 2.5 v ol [v] temperature [c]
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 11 typical performance characteristics (continued) figure 28. maximum output voltage vs. temp. fig ure 29. output voltage when uvlo vs. temp. figure 30. restart timer delay vs. temp. figure 31. over-voltage protection vs. temp. figure 32. ovp hysteresis vs. temp. figur e 33. enable threshold voltage vs. temp. -60 -40 -20 0 20 40 60 80 100 120 140 11.5 12.0 12.5 13.0 13.5 14.0 14.5 v o(max) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.0 0.2 0.4 0.6 0.8 1.0 v o(uvlo) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 50 100 150 200 250 300 350 400 t d(rst) [ s] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 2.60 2.62 2.64 2.66 2.68 2.70 2.72 2.74 v ovp [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.06 0.08 0.10 0.12 0.14 hy(ovp) [v] temperature [c] -60 -40 -20 0 20 40 60 80 100 120 140 0.40 0.42 0.44 0.46 0.48 0.50 v th(en) [v] temperature [c]
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 12 typical performance characteristics (continued) figure 34. enable hysteresis vs. temp. -60 -40 -20 0 20 40 60 80 100 120 140 0.06 0.08 0.10 0.12 0.14 hy(en) [v] temperature [c]
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 13 applications information 1. error amplifier block the error amplifier block has several functions, such as dual output function, over-vol tage protection function, and disable function. 1.1 dual-output function unlike conventional crm pfc controllers, the fan7528 has the dual-output control function according to the ac line voltage without sensing t he rectified ac line voltage. because the output voltage of the boost converter is pro- portional to the peak voltage of the input ac line voltage before the boost converter star ts switching, the inv pin voltage represents the peak ac line voltage. when the ac line is connected to the boost converter, v cc voltage starts to increase from zero voltage. if the v cc voltage reaches 8.5v, the dual-output reference generator com- pares the inv pin voltage with 1.3v reference and, if the inv pin voltage is lower than 1.3v, the dual-output refer- ence generator sets the refe rence voltage of the error amplifier to 1.5v. if the inv pin voltage is higher than 1.3v, the reference voltage is set to 2.5v. that means if the output voltage of the boost converter is set to 400v at high line, the output volta ge is 240v (400v*1.5/2.5) at low line. if the output voltage is set to 390v at high line, the output voltage is 234v at low line. because this block does not need the input voltage sensing network, the power loss and cost related with the sensing network can be saved. the reference voltage of the error ampli- fier is not reset until v cc goes below 4.5v. figure 35. error amplifier block 1.2 over-voltage protection function the control speed of the pfc converter is very slow; therefore, the over-voltage protection (ovp) of the out- put voltage is very important. the fan7528 provides a precise ovp function that s huts down the drive circuit when the inv pin voltage exceeds 2.66v and there is 0.11v hysteresis. 1.3 disable function if the inv pin voltage is lower than 0.45v, most of the internal block is disabled, the operating current is reduced to be 65a, and there is 0.1v hysteresis in the comparator. 1.4 error amplifier the error amplifier is a transconductance type amplifier. the output current of the amp lifier is proportional to the voltage difference between the inverting input and the non-inverting input of the amplifier. some resistors and capacitors should be connected to the error amplifier output pin, the comp pin, for the output voltage loop compensation. 2. zero current detection block the zero current detector (zcd) generates the turn-on signal of the mosfet when the boost inductor current reaches zero using an auxiliary winding coupled with the inductor. if the voltage of the zcd pin goes higher than 1.5v, the zcd comparator waits until the voltage goes below 1.4v. if the voltage goes below 1.4v, the zero cur- rent detector turns on the mosfet. the zcd pin is pro- tected internally by two clamps, 6.7v high clamp and 0.6v low clamp. the 160s timer generates a mosfet turn-on signal if the drive output has been low for more than 160s from the falling edge of the drive output. figure 36. zero current detector block ovp 2.66v 2.55v 0.45v 0.35v disable inv error amp comp 2 1 gm dual-output reference generator v out 1.5v/2.5v fan7528 rev. 1.00 timer zcd 6.7v zero current detector r s q 5 1.5v 1.4v turn-on signal v in r zcd 160 s fan7528 rev. 1.00
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 14 3. sawtooth generator block the output of the error ampl ifier and the output of the sawtooth generator are compared to determine the mosfet turn-off instance. the slope of the sawtooth is determined by an external resistor connected to the mot pin. the voltage of the mot pin is 1v and the slope is proportional to the current flowing out of the mot pin. the internal ramp signal ha s 1v offset; therefore, the drive output is shut down if the voltage of the comp pin is lower than 1v. the mo sfet on-time is maximum when the comp pin voltage is 5v. according to the slope of the internal ramp, the maximum on-time can be pro- grammed. the necessary maximum on-time depends on the boost inductor, lowest ac line voltage, and maximum output power. the resistor value should be designed properly. figure 37. sawtooth generator block 4. over-current protection block the mosfet current is sensed using an external sens- ing resistor for the over-current protection. if the cs pin voltage is higher than 0.8v, the over-current protection comparator generates a protection signal. an internal rc filter is included to filter switching noise. figure 38. over-current protection block 5. switch drive block the fan7528 contains a single totem-pole output stage designed for a direct drive of power mosfet. the drive output is capable of up to 400ma peak current with a typ- ical rise and fall time of 50ns with 1nf load. the output voltage is clamped to be 13v to protect mosfet gate even if the v cc voltage is higher than 13v. 6. under-voltage lockout block if the v cc voltage reaches 12v, the ic?s internal blocks are enabled and start operation. if the v cc voltage drops below 8.5v, most of the internal blocks are disabled to reduce the operating current. v cc voltage should be higher than 8.5v under normal conditions. 1v mot sawtooth generator 3 error amp output off signal 1v fan7528 rev. 1.00 8pf 40k cs over-current protection comparator 4 0.8v ocp signal fan7528 rev. 1.00
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 15 typical application circuit features ? high efficiency (>90% at 90 vac input) ? low thd (total harmonic distortion) (<10% at 264 vac input) ? dual-output control key design notes ? diode d4 is used to prevent ic malfunction that can happen if the cs pin voltage is lower than -0.3v. ? important components for low thd are r2, r5, and c11. 1. schematic figure 39. schematic application output power input voltage output voltage adapter 100w universal input (90~264 vac) 389v/232v f1 ac input 5 6 7 8 out v cc gnd zcd inv comp mot cs fan7528 1 2 34 v1 c1 c3 c4 lf1 c2 ntc bd c5 r1 c6 r3 r4 r5 t1 d1 c7 r7 r10 r6 r8 d2 r9 c8 q1 v aux r2 r11 c9 zd1 c10 pfc output d3 d4 c11 fan7528 rev. 1.00
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 16 2. inductor schematic diagram figure 40. inductor schematic diagram 3. winding specification 4. electrical characteristics 5. core & bobbin ? core: ei 3026 ? bobbin: ei3026 ? ae(mm 2 ): 111 no pin (s f) wire turns winding method np 5 30.2 10 44 solenoid winding insulation: polyester tape t = 0.050mm, 4 layers n vcc 2 10.2 1 6 solenoid winding outer insulation: polyester tape t = 0.050mm, 4 layers air gap: 0.6mm for each leg pin specification remarks inductance 3?5 400h 10% 100khz, 1v np 1 2 n vcc 5 3 fan7528 rev. 1.00
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 17 6. demo circuit part list part value note part value note fuse inductor f1 3a/250v t1 400h ei3026 ntc ntc 10d-9 mosfet resistor q1 fqpf13n50c fairchild r1 10k 1/4w r2 370k 1/4w diode r3 330k 1/2w d1 1n4148 fairchild r4 150 1/2w d2 byv26c 600v, 1a r5 20k 1/4w d3 1n5819 fairchild r6 10 1/4w d4 1n5819 fairchild r7 0.22 1/2w zd1 1n4746 18v r8 10k 1/4w r9 10k 1/4w bridge diode r10 2m 1/4w bd kbl06 600v/4a r11 12.9k 1/4w capacitor line filter c1 150nf/275vac box capacitor lf1 40mh wire 0.4mm c2 330nf/275vac box capacitor c3 2.2nf/3kv ceramic capacitor ic c4 2.2nf/3kv ceramic capacitor ic1 fan7528 fairchild c5 150nf/630v film capacitor c6 47uf/25v electrolytic capacitor tnr c7 47nf/50v ceramic capacitor v1 471 470v c8 220nf mlcc c9 100f/450v electro lytic capacitor c10 12nf/100v film capacitor c11 47pf/50v ceramic capacitor
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 18 7. layout figure 41. pcb layout considerations for fan7528 8. performance data 90 vac 110 vac 220 vac 264 vac 100w pf 0.999 0.998 0.991 0.983 thd 3.5% 3.6% 6.1% 7.3% 50w pf 0.997 0.996 0.971 0.947 thd 5.1% 5.5% 11.1% 13.0% power ground signal ground separate the power ground and the signal ground place the output voltage sensing resistors close to ic
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 19 mechanical dimensions 8-dip dimensions are in millimet ers unless otherwise noted. figure 42. 8-lead dual in-line package (dip)
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 20 mechanical dimensions 8-sop dimensions are in millimet ers unless otherwise noted. figure 43. 8-lead small outline package (sop)
fan7528 dual-output, critical conduction mode pfc controller ? 2005 fairchild semiconductor corporation www.fairchildsemi.com fan7528 rev. 1.0.6 21

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