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KA5M0965Q

Fairchild Power Switch(FPS)
Features
Precision Fixed Operating Frequency (70kHz) Low Start-up Current(Typ. 100uA) Pulse by Pulse Current Limiting Over Load Protection Over Current Protection Over Voltage Protection (Min. 25V) Internal Thermal Shutdown Function Under Voltage Lockout Internal High Voltage Sense FET Latch 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 frequency oscillator, under voltage lock-out, leading edge blanking, optimized gate turn-on/turn-off driver, thermal shutdown protection, over voltage protection, and temperature compensated precision current sources for loop compensation and fault protection circuitry. compared to discrete MOSFET and PWM controller or RCC solution, a 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-3P-5L

1

1. DRAIN 2. GND 3. VCC 4. FB 5. S/S

Internal Block Diagram
Vcc 3

27V

Drain 1
UVLO INTERNAL BIAS Good Logic
CLK

OVP OVP-out
V CC V REF 5uA 15V/9V 1mA

-

Vref

VOLTAGE Sense LIMIT CIRCUIT FET

OSC

Feedback 4 Soft Start 5

7.5V 5V O LP

14V 2.5R

S LEB R

Q

R

TSD (TJ 150) OVP-out (VCC 27V) OCL (VS 1.4V)

VO F F S E T

VS Rsense Q
LEB : Leading Edge Blanking OCL : Over Current Limit

S Power-on Reset /Auto-restart R

2 GND

Shutdown Latch

Rev.1.0.3
2003 Fairchild Semiconductor Corporation

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KA5M0965Q DATASHEET