KA3843AC Fairchild Semiconductor, KA3843AC Datasheet

KA3843AC

Manufacturer Part Number

KA3843AC

Description

SMPS Controller

Manufacturer

Fairchild Semiconductor

Datasheet

1.KA3843AC.pdf (6 pages)

Current page: 1 of 6
Download datasheet (84Kb)

www.DataSheet4U.com

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

Internal Block Diagram

KA3843AC

SMPS Controller

COMP

C.S

REF

Internal

Bias

1/2V

REF

Error Amp

OSCILLATOR

REF

Good LOGIC

1/3

RESET

SET/

C.S

Comp.

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.

UVLO

8-SOP

8-DIP

PWM

LATCH

29V

22V

www.fairchildsemi.com

OUTPUT

GND

PWR

GND

PWR

Rev. 1.0.1

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