©2003 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev.1.0.5

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)

- except KA5H0165RVN

• 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 is well suited for cost effective design of flyback

converters.

TO-220F-4L

8-DIP

1

1

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

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

9V

KA5x0165Rxx-SERIES

KA5H0165R/RN, KA5M0165R/RN, KA5L0165R/RN,

KA5H0165RVN

Fairchild Power Switch(FPS)