onsemi FSQ510H

700V Integrated Power Switch with Valley Switching control for 6Watt offline flyback converters

Isolated RoHS Compliant Obsolete Sync Converter Offline 28Ohm -40C~140C TJ 280mA 94.3kHz~132kHz

Switching Controller, Current-mode, 0.36A, 100kHz Switching Freq-Max, PDIP8

A Valley Switching Converter (VSC) generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ510 (H or M) is an integrated valley switching pulse width modulation (VS-PWM) controller and SenseFET specifically designed for offline switch-mode power supplies (SMPS) for valley switching with minimal external components. The VS-PWM controller includes an integrated oscillator, under-voltage lockout (UVLO), leading-edge blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry. Compared with discrete MOSFET and PWM controller solutions, the FSQ510 (H or M) can reduce total cost, component count, size and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a platform for cost-effective designs of a valley switching flyback converters.