FSDL321

www.fairchildsemi.com FSDH321, FSDL321 Green Mode Fairchild Power Switch (FPSTM) Features Internal Avalanche Rugged Sense FET Consumes only 0.65W at 240VAC & 0.3W load with Advanced Burst-Mode Operation Frequency Modulation for EMI Reduction Precision Fixed Operating Frequency Internal Start-up Circuit Pulse-by-Pulse Current Limiting Abnormal Over Current Protection (AOCP) Over Voltage Protection (OVP) Over Load Protection (OLP) Internal Thermal Shutdown Function (TSD) Auto-Restart Mode Under Voltage Lockout (UVLO) Low Operating Current (max 3mA) Adjustable Peak Current Limit Built-in Soft Start Applications SMPS for STB, Low cost DVD Player Auxiliary Power for PC Adapter & Charger Related Application Notes AN-4137, 4141, 4147(Flyback) / AN-4134(Forward) Description Each product in the FSDx321 (x for H, L) family consists of an integrated Pulse Width Modulator (PWM) and Sense FET, and is specifically designed for high performance offline Switch Mode Power Supplies (SMPS) with minimal external components. Both devices are integrated high voltage power switching regulators which combine an avalanche rugged Sense FET with a current mode PWM control block. The integrated PWM controller features include: a fixed oscillator with frequency modulation for reduced EMI, Under Voltage Lock Out (UVLO) protection, Leading Edge Blanking (LEB), an optimized gate turn-on/turn-off driver, Thermal Shut Down (TSD) protection, Abnormal Over Current Protecti...