FSQ311 Datasheet | Fairchild Semiconductor

Features - Optimized for Valley Switching (VSC) - Low EMI through Variable Frequency Control and Description A Valley Switching Converter generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and Sense FET specifically designed for valley switching operation with minimal external ponents. The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout, Leading Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-pensated precise current sources for loop pensation, and self-protection circuitry. pared with discrete MOSFET and PWM controller solutions, the FSQ-series reduces total cost, ponent count, size and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for costeffective designs of valley switching fly-back converters. Inherent Frequency Modulation - High-Efficiency through Minimum Voltage Switching - Narrow Frequency Variation Range over Wide Load and Input Voltage Variation - Advanced Burst-Mode Operation for Low Standby Power Consumption - Pulse-by-Pulse Current Limit - Various Protection Functions: Overload Protection - - - - (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) Under-Voltage Lockout (UVLO) with Hysteresis Internal Start-up Circuit Internal High-Voltage Sense FET (650V) Built-in Soft-Start (15ms) Applications - Power Supply for DVP Player and DVD Recorder, Set-Top Box - Adapter - Auxiliary Power Supply for PC, LCD TV, and PDP TV Related Application Notes - AN-4137, AN-4141, AN-4147, AN-4150 (Flyback) - AN-4134 (Forward) FPSTM is a trademark of Fairchild Semiconductor Corporation. © 2006 Fairchild Semiconductor Corporation FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev....