KA3843AC 데이터 시트보기 (PDF) - Fairchild Semiconductor

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KA3843AC

SMPS CONTROLLER

Fairchild Semiconductor 

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

www.fairchildsemi.com

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

VREF 8

Internal

Bias

5V

VREF

SET/

RESET

Good LOGIC

UVLO

VFB 2

COMP 1

1/2VREF

Error Amp

+

-

1/3

1V

C.S PWM

Comp. LATCH

R

S

C.S 3

T

RT/CT 4

OSCILLATOR

©2005 Fairchild Semiconductor Corporation

7 VCC

29V

5 GND

7

PWR

VC

22V 6 OUTPUT

5

PWR

GND

Rev. 1.0.1

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