Product Summary

The DM311 is a Green Mode Fairchild Power Switch, which consists of integrated Pulse-Width Modulator (PWM) and SenseFET It is specifically designed for high-performance, off-line Switch Mode Power Supplies (SMPS) with minimal external components. The DM311 is an integrated high-voltage, power-switching regulator which 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 turn-on/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 DM311 device reduces total component count and design size and weight; while increasing efficiency, productivity, and system reliability. The DM311 provides a basic platform that is well suited for the design of cost-effective flyback converters. The applications of the DM311 include Charger & Adapter for Mobile Phone, PDA & MP3, Auxiliary Power for White Goods, PC, C-TV & Monitor.

Parametrics

DM311 absolute maximum ratings: (1)Drain Pin Voltage: 650 V; (2)Vstr Pin Voltage: 650 V; (3)Drain-Gate Voltage: 650 V; (4)Gate-Source Voltage: ±20 V; (5)Drain Current Pulsed: 1.5 A; (6)Continuous Drain Current (Tc=25℃): 0.5 A; (7)Continuous Drain Current (Tc=100℃): 0.32 A; (8)Single Pulsed Avalanche Energy: 10 mJ; (9)Supply Voltage: 20 V; (10)Feedback Voltage Range: -0.3 to VSTOP V; (11)Total Power Dissipation: 1.40 W; (12)Operating Junction Temperature: Internally limited; (13)Operating Ambient Temperature: -25 to +85 ℃; (14)Storage Temperature: -55 to +150 ℃.

Features

DM311 features: (1)Internal Avalanche Rugged SenseFET; (2)Precision Fixed Operating Frequency (67KHz); (3)Advanced Burst-Mode Operation (power consumption < 0.1W at 265VAC, no-load condition); (4)Internal Start-up Circuit; (5)Pulse-by-Pulse Current Limit; (6)Over-Voltage Protection (OVP); (7)Over-Load Protection (OLP); (8)Internal Thermal Shutdown Function (TSD); (9)Auto-Restart Mode; (10)Under-Voltage Lockout (UVLO) with Hysteresis; (11)Built-in Soft-Start.

Diagrams