www.fairchildsemi.com
KA3S1265R/KA3S1265RF/ KA3S1265RD
Fairchild Power Switch(FPS)
Features
• • • • • • • • • Wide oper...
www.fairchildsemi.com
KA3S1265R/KA3S1265RF/ KA3S1265RD
Fairchild Power Switch(FPS)
Features
Wide operatimg frequency range up to (150kHz) Pulse by pulse over current limiting Over load protection Over
voltage protecton (Min. 23V) Internal thermal shutdown function Under
voltage lockout Internal high
voltage sense FET External sync terminal 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 control IC features a trimmed oscillator, under
voltage lock-out, leading edge blanking, optimized gate turn-on/turn-off driver, thermal shut down protection, over
voltage protection, temperature compensated precision current sources for loop compensation and fault protection circuit. compared to discrete
MOSFET and controller or RCC switching converter 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 C-TV power supply.
TO-3P-5L
TO-3PF-5L
1
1
1. DRAIN 2. GND 3. Vcc 4. FB 5. Sync
Internal Block Diagram
#3 VCC 32V 5V Vref − 5V + 6.4V #4 FB − 1mA 2.5R 1R 9V + 7.5V − + 25V − Thermal S/D OVER
VOLTAGE S/D + OSC S R 2µA L.E.B 0.1V S R Q #2 GND Q Good logic Internal bias #1 DRAIN SFET
#5 Sync...