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KA3843AC

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 KA3843AC are fixed PWM controller for Off-Line and DC to DC converter applications. The internal circuits include UVLO, low start up current circuit, temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totem-pole output for driving a POWER MOSFET. Also KA3843AC provide low start up current below 0.3mA and short shutdown delay time typ. 100ns. The KA3843AC is 8.4V(on) and 7.6V(off). The KA3843AC 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
2005 Fairchild Semiconductor Corporation

KA3843A Datasheet Fairchild Download PDF

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KA3843A DATASHEET