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KA3882E/KA3883E
SMPS Controller
Features
Low start current 0.2mA (typ) Operating range up to 500kHz Cycle by cycle current limiting Under voltage lock out with hysteresis Short shutdown delay time: typ.100ns High current totem-pole output Output swing limiting: 22V

Description
The KA3882E/KA3883E is a fixed PWM controller for Off-Line and DC to DC converter applications. The internal circuits include a UVLO, a low start-up current circuit, a temperature compensated reference, a high gain error amplifier, a current sensing comparator, and the high current totem-pole output for driving a POWER MOSFET. Also the KA3882E/KA3883E provides low start-up current below 0.3mA and short shutdown delay time typ. 100ns. The KA3882E has UVLO threshold of 16V(on) and 10V(off). The KA3883E is 8.4V(on) and 7.6V(off). The KA3882E and KA3883E can operate within 100% duty cycle.
8-DIP

1

8-SOP

1

Internal Block Diagram

7 VCC 29V

VREF 8
Internal Bias 1/2VREF

5V VREF

SET/ RESET UVLO

5 GND

Good LOGIC 7 Error Amp C.S PWM Comp. LATCH 1/3 1V S R 22V 6 OUTPUT

PWR VC

VFB 2

COMP 1
5 PWR

C.S 3 RT/CT 4

T

GND

OSCILLATOR

Rev. 1.0.1
2003 Fairchild Semiconductor Corporation

KA3882E Datasheet Fairchild Download PDF

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KA3882E DATASHEET