Q0765R Datasheet | Fairchild Semiconductor

Features - Optimized for Quasi-Resonant Converter (QRC) - Low EMI through Variable Frequency Control and AVS Description A Quasi-Resonant Converter (QRC) 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 quasi-resonant operation and Alternating Valley Switching (AVS). The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout (UVLO), Leading Edge Blanking (LEB), optimized gate driver, internal softstart, temperature-pensated precise current sources for a loop pensation, and self-protection circuitry. pared with a discrete MOSFET and PWM controller solution, the FSQ-series can reduce total cost, ponent count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform for cost-effective designs of quasi-resonant switching flyback converters. (Alternating Valley Switching) - 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 - Simple Scheme for Sync Voltage Detection - Pulse-by-Pulse Current Limit - Various Protection functions: Overload Protection - - - - (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with Hysteresis, Output Short Protection (OSP) Under-Voltage Lockout (UVLO) with Hysteresis Internal Start-up Circuit Internal High-Voltage Sense FET (650V) Built-in Soft-Start (17.5ms) Applications - Power Supply for LCD TV and Monitor, VCR, SVR, STB, and DVD & DVD Recorder - Adapter Related Resourses Visit: http://.fairchildsemi./apnotes/ for: - AN-4134: Design Guidelines for Offline Forward - - - - - - - Converters Using Fairchild Power Switch...