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KA5Q0740RT
Features

Fairchild Power Switch(FPS)
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) consists of a high voltage power SenseFET and a current mode PWM IC. The integrated PWM controller includes the fixed oscillator, the under voltage lock out, the leading edge blanking, the optimized gate turn-on/turn-off driver, the thermal shut down protection, the over voltage protection, and the temperature compensated precision current sources for loop compensation and fault protection circuitry. Compared to a discrete MOSFET and a controller or a RCC switching converter solutions, a Fairchild Power Switch(FPS) can reduce the total number of components, design size, and weight, so it will improve efficiency, productivity, and system reliability. It has a basic platform well suited for cost-effective design in a quasi-resonant converter as a C-TV power supply.
TO-220F-5L

Quasi Resonant Converter Controller Internal Burst Mode Controller for Stand-by Mode Pulse by Pulse Current Limiting Over Current Latch Protection Over Voltage Protection (Vsync: Min. 11V) Internal Thermal Shutdown Function Under Voltage Lockout Internal High Voltage Sense FET Auto-Restart Mode

1. Drain 2. GND 3. VCC 4. Feedback 5. Sync

Internal Block Diagram
VCC DRAIN

3
32V -1% 11V on 12V off Burst Mode 3.5V/1.25V Internal BIAS

1

VREF

UVLO 15V/9V

S Ro Ron n QB

SYNC

5
Normal Mode 4.6V/2.6V VREF

-

OSC

R

Roff f

Rof

Ifb

LEB 450ns

FEEDBACK

4

2.5R R

Idelay

1V

S Q

Offset

7.5V

Delay 80ns

-

OLP

Power on Reset

OCL
Thermal Shut Down Power on Reset (VCC 6.5V)

-

Rsense 1V

R Q S R

Sync 12V

2 SOURCE

OVP

Rev.1.0.5
2004 Fairchild Semiconductor Corporation

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KA5Q0740RT DATASHEET