Fairchild/ON Semiconductor FSQ321L

650V Integrated Power Switch with Valley Switching control for 10Watt offline flyback converters
FSQ321 LAST SHIPMENTS (Last Updated: 2days ago) Current Limiting Over Load Over Temperature Over Voltage Tube dc ac converter 9V 9.4mm 10W 55kHz~67kHz
POWER SWITCH SMPS GREEN, SMD, LSOP8; Power Supply Type:SMPS; Max Output Current:0.6A; Voltage, Output Max:700V; No. of Outputs:1; Power Dissipation:1.5W; Frequency:89.3kHz; Voltage, Supply Max:20V; Termination Type:SMD; Case Style:LSOP; No. of Pins:8; Operating Temperature Range:-25°C to 85°C; Temp, Op. Max:85°C; Temp, Op. Min:-25°C; Base Number:321; Enc Power Output @ 230VAC:8W; Enc Power Output @ 85-265VAC:7W; Power, Output of @ 230VAC:12W; Power, Output of @ 85-265VAC:10W; Resistance, Rds On:14ohm; Voltage, Output:700V; Voltage, Vcc:15V
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 SenseFET specifically designed for valley switching operation with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout, 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 FSQ-series reduces total cost, component count, size and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for cost-effective designs of valley switching fly-back converters.