KA3842AC Datasheet

IC型號(hào)：
KA3842AC
PDF描述：
SMPS Controller
文件大?。?/label>
40.12KB
PDF頁數(shù)：
6頁
芯片廠家：
FAIRCHILD

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www.fairchildsemi.com

KA3842AC

SMPS Controller

Features

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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 KA3842AC 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 KA3842AC provides low

start up current below 0.3mA and short shutdown delay

time typ. 100ns. The KA3842AC has UVLO threshold of

16V(on) and 10V(off). The KA3842AC can operate within

100% duty cycle.

8-DIP

Internal Block Diagram

29V

REF

Internal

Bias

1/2V

REF

SET/

RESET

UVLO

GND

Good LOGIC

Error Amp

C.S

PWM

Comp. LATCH

1/3

22V

OUTPUT

PWR

COMP

PWR

C.S

GND

OSCILLATOR

Rev. 1.0.0

漏2005 Fairchild Semiconductor Corporation

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