KA3842AC datasheet(1/6 Pages) FAIRCHILD

No de pièce	KA3842AC

Description	SMPS Controller

Download	6 Pages

Scroll/Zoom	100%

Fabricant	FAIRCHILD [Fairchild Semiconductor]

Site Internet	http://www.fairchildsemi.com

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Rev. 1.0.0

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 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

1

Internal Block Diagram

8

+

-

7

5

SET/

RESET

5V

VREF

Internal

Bias

Good LOGIC

2

R

S

OSCILLATOR

1

3

4

T

7

6

5

UVLO

29V

22V

1/3

Error Amp

1/2VREF

1V

C.S

Comp.

PWM

LATCH

VREF

VFB

COMP

C.S

RT/CT

OUTPUT

VCC

GND

PWR

VC

PWR

GND

KA3842AC

SMPS Controller

Numéro de pièce similaire - KA3842AC

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Fairchild Semiconductor	KA3842AC	122Kb / 6P	SMPS Controller
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