FSQ0465RS

A Quasi-Resonant Converter FSQ-series (QRC) generally showslower EMI and higher power conversion efficiency than aconventional hard-switched converter with a fixedswitching frequency. The FSQ-series is an integratedPulse-Width Modulation (PWM) controller andSenseFET specifically designed for quasi-resonantoperation and Alternating Valley Switching (AVS). ThePWM controller FSQ-series includes an integrated fixed-frequencyoscillator, Under-Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), optimized gate driver, internal softstart,temperature-compensated precise current sourcesfor a loop compensation, and self-protection circuitry.Compared with a discrete MOSFET and PWM controllersolution, the FSQ-series can reduce total cost,component count, size, and weight; while simultaneouslyincreasing efficiency, productivity, and system reliability.FSQ-series provides a basic platform for cost-effectivedesigns of quasi-resonant switching flyback converters.