Features

Internal Avalanche-Rugged SenseFET

Precision Fixed Operating Frequency: 67KHz

Consumes Under 0.2W at 265VAC & No Load with Advanced Burst-Mode Operation

Internal Start-up Circuit

Pulse-by-Pulse Current Limiting

Over-Voltage Protection (OVP)

Overload Protection (OLP)

Internal Thermal Shutdown Function (TSD)

Auto-Restart Mode

Under-Voltage Lockout (UVLO) with Hysteresis

Built-in Soft-Start

Secondary-Side Regulation

Applications

Charger & Adapter for Mobile Phone, PDA, & MP3

Auxiliary Power for White Goods, PC, C-TV, & Monitors

Description

The FSDM311A consists of an integrated Pulse Width Modulator (PWM) and SenseFET, and is specifically designed for high-performance, off-line, Switch-Mode Power Supplies (SMPS) with minimal external components. This device is an integrated high-voltage power switching regulator that combines a VDMOS SenseFET with a voltage-mode PWM control block. The integrated PWM controller features include a fixed oscillator, Under-Voltage Lockout (UVLO) protection, Leading-Edge Blanking (LEB), an optimized gate turnon/turn-off driver, Thermal Shutdown (TSD) protection, 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 FSDM311A device reduces total component count and design size and weight, while increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for the design of cost-effective flyback converters.