©2003 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev.1.0.4

Features

• Precision Fixed Operating Frequency (100/67/50kHz)

• Low Start-up Current (Typ. 100uA)

• Pulse by Pulse Current Limiting

• Over Load Protection

• Over Voltage Protection (Min. 25V)

• Internal Thermal Shutdown Function

• Under Voltage Lockout

• Internal High Voltage Sense FET

• Auto-Restart Mode

Description

The Fairchild Power Switch(FPS) product family is specially

designed for an off-line SMPS with minimal external

components. The Fairchild Power Switch(FPS) consist of high

voltage power SenseFET and current mode PWM IC. Included

PWM controller features integrated fixed oscillator, under

voltage lock out, leading edge blanking, optimized gate turn-on/

turn-off driver, thermal shut down protection, over voltage

protection, and temperature compensated precision current

sources for loop compensation and fault protection circuitry-

switching converter solution. The Fairchild Power Switch(FPS)

can reduce total component count, design size, weight and at the

same time increase efficiency, productivity, and system

reliability. It has a basic platform well suited for cost-effective

design in either a flyback converter or a forward converter.

TO-220F-4L

8-DIP

TO220-5L

1

1

1

1. Drain

2. GND

3. Vcc

4. FB

5. S/S

1.6.7.8. Drain

2. GND

3. Vcc

4. FB

5. NC

1. GND

2. Drain

3. Vcc

4. FB

uA

Internal Block Diagram

32V

5

µA

5V

2.5R

1R

1mA

0.1V

+

−

OVER VOLTAGE S/D

+

−

7.5V

27V

Thermal S/D

S

R

Q

Power on reset

+

−

L.E.B

S

R

Q

OSC

5V

Vref

Internal

bias

Good

logic

SFET

DRAIN

GND

FB

Soft Start

9V

*

* KA5H0265RC

KA5x02xx-SERIES

KA5H0265RC, KA5M0265R, KA5L0265R,

KA5H02659RN/KA5M02659RN, KA5H0280R,

KA5M0280R

Fairchild Power Switch(FPS)