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 Protection (AOCP) and temperature compensated precision current sources for loop compensation and fault protection circuitry. When compared to a discrete MOSFET and controller or RCC switching converter solution, the FSDx321 devices reduce total component count, design size, weight while increasing efficiency, productivity and system reliability. Both devices provide a basic platform that is well suited for the design of cost-effective flyback converters.

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