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FAN7527B
Power Factor Correction Controller
Features
* Internal start-up timer * Internal R/C filter eliminates the need for an external R/C filter * Very precise adjustable output over voltage protection * Zero current detector * One quadrant multiplier * Trimmed 1.5% internal band gap reference * Under voltage lockout with 3V of hysteresis * Totem pole output with high state clamp * Low start-up and operating current * 8-Pin DIP or 8-Pin SOP
Description
The FAN7527B provides simple and high performance active power factor correction. The FAN7527B is optimized for electronic ballasts and low power and high density power supplies which require minimum board size, reduced external components and low power dissipation. Because the R/C filter is included in the current sense block, the external R/C filter is not necessary. Special circuitry has also been added to prevent no load runaway conditions. Regardless of the supply voltage, the output drive clamping circuit limits the overshoot of the power MOSFET gate drive. It greatly enhances the system reliability.
8-DIP
Applications
* Electronic ballast * SMPS
1
8-SOP
1
Rev 1.0.2
(c)2003 Fairchild Semiconductor Corporation
FAN7527B
Internal Block Diagram
Vcc
8
2.5V Ref
Vcc
+ -
11.5V 8.5V
UVLO
Internal Bias
Drive Output Timer R
7 OUT
Idet
5 7.2V 2V 1.5V
+ -
Zero Current Detector
S
Q Static OVP
40k CS 4 8pF
+ -
R Current Sense Comparator Vref Veao(L)=2.25V
+ -
2.25V
1.8V Vmo MULT 3 Vm1 0 ~ 3.8V Multiplier
Vmo K= Vm1 (Vm2 - Vref )
-
+
0.25V Vm2
Vref~Vref+2.5V Isovp=30uA Idovp=40uA
+ -
Vref Vea(-) 1 INV
OVP Current Detector 6 GND 2 EA_OUT
Error Amp
2
FAN7527B
PIN Description
INV
1 2 3 4
(Top View)
8 7 6 5
Vcc OUT GND ldet
EA_OUT MULT CS
Pin Number 1 2 3 4 5 6 7 8
Pin Name INV EA_OUT MULT CS ldet GND OUT Vcc
Pin Function Description Inverting input of the error amplifier. the output of the boost converter should be resistively divided to 2.5V and connected to this pin. The output of the error amplifier. a feedback compensation network is placed between this pin and the INV pin. Input to the multiplier stage. the full-wave rectified ac voltage is divided to less than 2V and is connected to this pin. Input of the PWM comparator. the MOSFET current is sensed by a resistor and the resulting voltage is applied to this pin. an internal R/C filter is included to reject any high frequency noise. Zero current detection input. The ground potential of all the pins. Gate driver output. the push pull output stage is able to drive the power MOSFET with peak current of 500mA. Supply voltage of driver and control circuits.
3
FAN7527B
Absolute Maximum Ratings (Ta=25C)
Characteristics Supply voltage Peak drive output current Driver output clamping diodes Vo > Vcc or Vo < -0.3V Detector clamping diodes Error amp, multiplier and comparator input voltages Operating junction temperature Operating temperature range Storage temperature range Power dissipation 8-DIP 8-SOP Symbol VCC IOH,IOL lclamp ldet Vin Tj Topr Tstg Pd Value 30 500 10 10 -0.3 to 6 150 -25 to 125 -65 to 150 1.1 0.8 Unit V mA mA mA V C C C W
Thermal Data
Characteristics Thermal resistance junction-ambient Max. 8-DIP 8-SOP Symbol Rja Value 110 150 Unit C/W
Temperature Characteristics (-25C Ta 125C)
Characteristics Temperature stability for reference voltage (Vref) Temperature stability for multiplier gain (K) Symbol Vref K/T Min. Typ. 20 -0.2 Max. Unit mV %/C
4
FAN7527B
Electrical Characteristics
VCC= 14V, -25C Ta 125C, unless otherwise stated. Characteristics Start threshold voltage UVLO hysteresis < SUPPLY CURRENT SECTION > Start-up supply current Operating supply current Operating current at OVP Dynamic operating supply current < ERROR AMPLIFIER SECTION > Voltage feedback input threshold Line regulation Temperature stability of Vref (Note1) Input bias current Output source current Output sink current Output upper clamp voltage (Note2) Output lower clamp voltage (Note3) Large signal open loop gain (Note4) Power supply rejection ratio (Note5) Unity gain bandwidth (Note6) Slew rate (Note7) < MULTIPLIER SECTION> Input bias current (pin3) M1 input voltage range (pin3) M2 input voltage range (pin2) Multiplier gain (Note8) Maximum multiplier output voltage Temperature stability of K (Note9) Ib(m) Vm1 Vm2 K K/T Vm1 = 1V, Vm2 = 3.5V -25 Ta 125C -0.5 0 Vref 0.36 1.65 0.44 1.8 -0.2 0.5 3.8 Vref+2.5 0.52 1.95 uA V V 1/V V %/C Vref Vref1 Vref3 Ib(ea) Isource Isink Veao(H) Veao(L) Gv PSRR GBW SR Vm2 = 4V Vm2 = 4V Isource = 0.1mA Isink = 0.1mA 14V Vcc 25V Iref = 0mA, Ta = 25C -25 Ta 125C 14V Vcc 25V -25 Ta 125C 2.465 2.44 -0.5 -2 2 60 60 2.5 2.5 0.1 20 -4 4 6 2.25 80 80 1 0.6 2.535 2.56 10 0.5 V V mV mV uA mA mA V V dB dB MHz V/us Ist Icc Icc(ovp) Idcc Vcc = Vth(st) -0.2V Output not switching Vinv = 3V 50kHz, CI = 1nF 10 60 3 1.7 4 100 6 4 8 uA mA mA mA Symbol Vth(st)
HY(st)
Test Condition Vcc Increasing -
Min. 10.5 2
Typ. 11.5 3
Max. 12.5 4
Unit V V
< UNDER VOLTAGE LOCKOUT SECTION>
Vomax(m) Vinv =0V, Vm1 = 4V
5
FAN7527B
Electrical Characteristics (Continued)
VCC= 14V, -25C Ta 125C, unless otherwise stated. Characteristics < CURRENT SENSE SECTION> Input offset voltage (Note8) Input bias current Current sense delay to output (Note11) < ZERO CURRENT DETECT SECTION > Input voltage threshold Detect hysteresis Input low clamp voltage Input high clamp voltage Input bias current < OUTPUT SECTION > Output voltage high Output voltage low Rising time (Note13) Falling time (Note14) Maximum output voltage Output voltage with UVLO activated < RESTART TIMER SECTION> Restart time delay Soft OVP detecting current Dynamic OVP detecting current Static OVP threshold voltage Isovp Idovp Vovp Vinv = 2.7V 25 35 2.1 30 40 2.25 35 45 2.4 uA uA V td(rst) Vm1 = 1V, Vm2 = 3.5V 150 us Voh VoI tr tf Vomax(o) Vomin(o) Io = -10mA Io = 10mA CI = 1nF CI = 1nF Vcc = 20V, Io = 100uA Vcc = 5V , Io = 100uA 10.5 12 11 0.8 130 50 14 1 200 120 16 1 V V ns ns V V Vth(det) HY(det) Vclamp(I) Ib(det) Vclamp(h) Idet = 3mA 1V Vdet 5V Vdet increasing Idet = -100uA 1.7 0.2 0.45 6.5 -1 2 0.5 0.75 7.2 -0.1 2.3 0.8 1 7.9 1 3 V V V V uA mA Vio(cs) Ib(cs) td(cs) Vm1=0V , Vm2 = 2.2V 0V Vcs 1.7V -10 -1 3 -0.1 200 10 1 500 mV uA ns Symbol Test Condition Min. Typ. Max. Unit
Input high/low clamp diode current (Note12) Iclamp(d)
Note 1 ~ 14: These parameters, although guaranteed, are not 100% tested in production. Pin4_Threshold Multiplier Gain: K = ------------------------------------------------------ ...... ( Vm1 = Vpin3,Vm2 = Vpin2 ) Vm1 x ( Vm2 - Vref )
6
FAN7527B
Typical Performance Characteristics
Fig.1 E.A. Output Voltage vs. C.S. Threshold
2.0 Vm1=3.0V Vm1=2.5V Vm1=2.0V Vm1=3.5V
Fig.2 Multiplier Input Voltage vs. C.S. Threshold
2.0 1.8 Veao=4.25V Veao=4.0V Veao=3.75V
CS Threshold Voltage(V) C.S Threshold Voltage(V)
CS Threshold Voltage(V)
1.5 Vm1=4.0V
C.S. Threshold Voltage(V)
Vm1=1.5V
1.6 1.4 1.2
Veao=4.5V
Veao=3.5V
Veao=3.25V
Vm1=1.0V 1.0
Veao=3.0V 1.0 0.8 Veao=2.75V 0.6 0.4 0.2 Veao=2.5V
Vm1=0.5V 0.5
Vm1=0V 0.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0.0 0 1 2 3 4 5
EA Output Voltage(V)
Multiplier Input Voltage(V)
Figure 1. Error Amplifier Output Voltage vs Current Sensing Threshold
Fig.3 Supply Current vs. Supply Voltage
0.015
Figure 2. Multiplier Input Voltage vs Current Sensing Threshold
Fig.4 Reference Voltage vs. Temperature
2.7
0.012
2.6
0.009
Reference Voltage(V)
Supply Current(A)
2.5
0.006
2.4
0.003
0.000 0 10 20 30 40 50
2.3 -25 0 25 50 75 100 125
Supply Voltage(V)
Temperature ()
Figure 3. Supply Current vs Supply Voltage
Figure 4. Reference Voltage vs Temperature
Fig.5 Start-up Threshold vs. Temperature
14 12 10 8 6 4 2 0 -25 0 25 50 75 100 125
Fig.6 UV Lockout Hysteresis vs. Temperature
5
4
UV Lockout Hyteresis(V)
Startup Threshold(V)
3
2
1
0 -25 0 25 50 75 100 125
Temperature ()
Temperature ()
Figure 5. Start-Up Threshold vs Temperature
Figure 6. UV Lockout Hysteresis vs Temperature
7
FAN7527B
Typical Performance Characteristics (Continued)
Fig.7 Start-up Supply Current vs. Temperature
100 90
Fig.8 E.A. Source CurrenT vs. Temperature
0
Start-up Supply Current(uA)
80 70 60 50 40 30 20 10 0 -25 0 25 50 75 100 125
-1
EA Source Current(mA)
-2
-3
-4
-5 -25 0 25 50 75 100 125
Temperature ()
Temperature ()
Figure 7. Start-Up Supply Current vs Temperature
Figure 8. Error Amplifier Source Current vs Temperature
Fig.10 E.A. Input Bias Current vs. Temperature
0.5 0.4
Fig.9 E.A. Sink Current vs. Temperature
5
EA Input Bias Current(uA)
4
0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4
EA Sink Current(mA)
3
2
1
0 -25 0 25 50 75 100 125
-0.5 -25 0 25 50 75 100 125
Temperature ()
Temperature ()
Figure 9. Error Amplifier Sink Current vs Temperature
Fig.11 Multiplier Gain vs. Temperature
1.0
Figure 10. Error Amplifier Input Bias Current vs Temperature
Fig.12 Idet Threshold Voltage vs. Temperature
4.0
0.8
3.2
0.6
Idet Threshold Voltage(V)
-25 0 25 50 75 100 125
Multiplier Gain(1/V)
2.4
0.4
1.6
0.2
0.8
0.0
0.0 -25 0 25 50 75 100 125
Temperature ()
Temperature ()
Figure 11. Multiplier Gain vs Temperature
Figure 12. ldet Threshold Voltage vs Temperature
8
FAN7527B
Typical Performance Characteristics (Continued)
Fig.13 Idet Input Hysteresis vs. Temperature
1.0
500 450
0.8
Idet Input Hysteresis(mV)
400 350
0.6
Restart Time(us)
-25 0 25 50 75 100 125
300 250 200 150 100 50
0.4
0.2
0.0
0 -25
0
25
50
75
100
125
Temperature ()
Temperature()
Figure 13. ldet Input Hysteresis vs Temperature
Figure 14. Restart Time vs Temperature
Fig.15 Max. Mult. Output Voltage vs. temperature
2.0
Fig.16 Supply Current vs. Temperature
5
Maximum Mult. Output Voltage(V)
1.6
4
Supply Current(mA)
1.2
3
0.8
2
0.4
1
0.0 -25 0 25 50 75 100 125
0 -25 0 25 50 75 100 125
Temperature ()
Temperature ()
Figure 15. Max.Mult.Output Voltage vs Temperature
Figure 16. Supply Current vs Temperature
9
FAN7527B
Mechanical Dimensions
Package Dimensions in millimeters
8-DIP
0.018 0.004 1.524 0.10 0.060 0.004 0.46 0.10 6.40 0.20 0.252 0.008 ( #1 #8 9.20 0.20 0.362 0.008 9.60 MAX 0.378 #4 #5 2.54 0.100 5.08 MAX 0.200 7.62 0.300 3.40 0.20 0.134 0.008 3.30 0.30 0.130 0.012 0.33 MIN 0.013 0.79 ) 0.031
0.25 -0.05
0~15
+0.10
0.010 -0.002
+0.004
10
FAN7527B
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
8-SOP
Symbol A A1 A2 B C D E e H h L GP q aaa bbb
Min 0.10 1.25 0.35 0.19 4.80 3.80 5.79 0.25 0.50 0 -
Nom 0.15 1.45 0.37 0.20 4.90 3.90 1.27BSC 5.99 0.70 0.36 BSC -
Max 1.75 0.25 1.50 0.51 0.25 5.00 4.00 6.20 0.50 0.90 8 0.25 0.10
11
FAN7527B
Ordering Information
Product Number FAN7527BN FAN7527BM Package 8-DIP 8-SOP Operating Temperature -25 ~ +125oC
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. 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.
www.fairchildsemi.com 8/16/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation
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.

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