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KA7524 LINEAR INTEGRATED CIRCUIT
POWER FACTOR CONTROLLER
DESCRIPTION
TheContek KA7524 provides the necessary features to
implement the Electronic BALLAST control and S.M.P.S
application for designing active power factor correction circuit
FEATURES
*Internal self-starting
*Micro power start up mode
*Included under voltage lockout circuit
*Internal 1% reference
*High output current: peak 500mA
DIP-8
BLOCK DIAGRAM
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
1
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KA7524 LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS(Ta=25 C)
PARAMETER SYMBOL VALUE UNIT
Supply Voltage Vcc 20 V
Peak Driver Output Current Io(p) 500 mA
Detect Clamping Diode Current Idet 10 mA
Output Clamping Diode Current Io(c.d) 10 mA
Operating Temperature Topr -45~65 C
Storage Temperature Tstg -65~150 C
ELECTRICAL CHARACTERISTICS (Ta=25 C)
(All voltage referenced to GND unless othrewise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Under Voltage Lockout Section
Start Threshold Voltage Vth(st) 9.2 10 10.8 V
UV lockout Hysteresis Vths 1.8 2.0 2.2 V
Supply Zener Voltage Vz 17 V
Supply Current Section
Start-up Supply Current Istart Vcc<Vth 0.25 0.5 mA
Operating Supply
Current
Dynamic Operating
Current
Reference Section (note 1)
Reference Voltage Vref 2.475 2.5 2.525 V
Line Regulation Vref 12V<Vcc<16V 0.1 10 mV
Load Regulation Vref 0<Iref<2mA 0.1 10 mV
Temperature Stability STt 20 mV
Error Amplifier Section
Input Offset Voltage Vio -15 15 mV
Input Bias Current Ibias -1 -0.1 1 mA
Large Signal Open Loop
gain
Power Supply Rejection
Ratio
Output Current Isource 2 mA
Output Voltage range Vo(p) 1.2 4 V
Unity Gain Bandwidth UBW 1.0 MHZ
Phase Margin MPH 57 C
Icc Vcc=12V,No load 6 12 mA
Icc(d) Vcc=12V,f=50KHZ,
Cgs=1000pF
Gv 60 100 dB
PSRR 60 86 dB
Isink -2 mA
10 20 mA
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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KA7524 LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Ta=25 C) (continued)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Multiplier Section
M1 Input Voltage Range Vi(m1) 0 2 V
M2 Input Voltage Range Vi(m2) Vref Vref+1 V
Input Bias Current Ibias -2 -0.5 2 mA
Multiplier Gain Gv Vi(m1)=0.5V,Vi(m2)=3V 0.8 /V
Multiplier Gain Stability STt -0.2 %/ C
Current Sense Section
Input Voltage Threshold Vth 1.0 1.3 1.6 V
Hysteresis Vths 200 mV
Input Low Clamp
Voltage
Input High Clamp
Voltage
Input Current Ii 0.8V<Vdet<6V 5 mA
Input Clamp Diode
Current
Current Detect Section
Output Voltage(High) Vo(H) Io=-10mA,Vcc=12V 7 9 V
Output Voltage(low) Vo(L) Io=10mA,Vcc=12V 0.8 1.8 V
Rising Time tr CL=1000pF 100 200 ns
Failing Time tf CL=1000pF 90 200 ns
Self-Start Section
Self Starting Time tss 12 ms
Vic(L) Idet=0mA 0.95 V
Vic(H) Idet=3mA 6.1 7.1 V
Icd Vdet<0.9V,Vdet>6V 3 mA
NOTE:
1.Reference can not be tested on the PKG
2.Gv= Vo(m)/(Vi(m1)*(Vi(m2)-Vref))
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
3
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KA7524 LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUIT
2A
H
TNR
F.G
N
C5
L1
C1
R3
R1 R4
C2
D1
8
3
C6 C7R2
NTC
C3
C4
R5
5
7
2
1
4
C9
6
BDI
R14
T1
D2
Q1
R6
C8
R13
R7
R8
R10
R11
R9
R12
VR1
C10 C11
Q3
R16
T2
D9
DIAC
R18
T2
R17
R19
D5
D3
T2
Q2
D6
D4
D7 C14
L2
L3
C13
C12
LAMP TUBE 1
LAMP TUBE 1
D8 C15
PART LIST
Resistor R16 5.1 W C10 47 mF/450V D6 FR107
R1 1.8M R17 27 W C11 0.1 mF D7 FR107
R2 10K R18 5.1 W C12 3300pF D8 FR107
R3 100K R19 27 W C13 3300pF BD1 PBP204
R4 3.3
R5 22K NTC 10 W C15 0.01 mF DIAIC 32V
R7 2.2K C1 0.1 mF IC1 Contek KA7524 T1 E1-25(PC30):P=70T
R8 2.2M C2 0.1 mF Q1 IRF830 S=4T,Gap=0.5mm
R9 150K C3 4700pF Q2 2SC5039 T2 D15(GP-5):
R10 330
R11 0.75
R12 5.1K C6 0.01 mF D2 1N4937 80mH
R13 1M C7 100 mF D3 1N4148 L2 EI-25(PC30):
R14 390K C8 0.1 mF D4 1N4148 150T,Gap=0.4mm
R15 3.9M C9 3300pF D5 FR107
VR1 5K C14 0.01 mF TNR 12G471
Capacitor Semiconductor Magnetics
C4 4700pF Q3 2SC5039 P=3T,S=13T
C5 0.1 mF D1 1N4004 L1 EE-25(Iron Power)
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
4
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