KA5x03xx-SERIES

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KA5x03xx-SERIES

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?2002 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 Current Protection ? Over Voltage Protection (Min. 25V) ? Internal Thermal Shutdown Function ? Under Voltage Lockout ? Internal High Voltage Sense FET ? Auto-Restart Mode Applications ? SMPS for VCR, SVR, STB, DVD & DVCD ? SMPS for Printer, Facsimile & Scanner ? Adaptor for Camcorder 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. Included PWM controller integrates the fixed frequency oscillator, the under voltage lock-out, the leading edge blanking, the optimized gate turn-on/turn-off driver, the thermal shutdown protection, the over voltage protection, and the temperature compensated precision current sources for the loop compensation and the fault protection circuitry. Compared to a discrete MOSFET and a PWM controller or an RCCsolution, a Fairchild Power Switch(FPS) can reduce the total component count, design size and weight and at the same time increase efficiency, productivity, and system reliability. It has a basic platform well suited for the cost effective design in either a flyback converter or a forward converter Internal Block Diagram

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