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www.fairchildsemi.com FSDM311 Features Green Mode Fairchild Power Switch (FPSTM) · Internal Avalanche Rugged Sense FET · 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) · Over Load Protection (OLP) · Internal Thermal Shutdown Function (TSD) · Auto-Restart Mode · Under Voltage Lockout (UVLO) with Hysteresis · Built-in Soft Start · Secondary Side Regulation OUTPUT POWER TABLE PRODUCT FSDM311 FSDM311L Open Frame(1) 230VAC±15%(2) 13W 13W 85-265VAC 8W 8W Notes: 1. Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sinker, at 50°C ambient. 2. 230 VAC or 100/115 VAC with doubler. Applications · Charger & Adapter for Mobile Phone, PDA & MP3 · Auxiliary Power for White Goods, PC, C-TV & Monitor Typical Circuit Related Application Notes · AN-4137, 4141, 4147(Flyback) / AN-4134(Forward) / AN-4138(Charger) AC IN DC OUT Vstr PWM Drain Description The FSDM311 consists of an integrated Pulse Width Modulator (PWM) and Sense FET, 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 which combines an VDMOS Sense FET with a voltage mode PWM control block. The integrated PWM controller features include: a fixed oscillator, Under Voltage Lock Out (UVLO) protection, Leading Edge Blanking (LEB), an optimized gate turn-on/turn-off driver, Thermal Shut Down (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 FSDM311 device reduces total component count, design size, 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. Vfb Vcc Source Figure 1. Typical Flyback Application FPSTM is a trademark of Fairchild Semiconductor Corporation. ©2005 Fairchild Semiconductor Corporation Rev.1.0.9 FSDM311 Internal Block Diagram Vstr 5 Vcc 2 UVLO Voltage Ref Internal Bias 9/7V IDELAY 5uA IFB 400uA L H 6,7,8 Drain Vck OSC PWM DRIVER S R S/S 15mS BURST SFET Vfb 3 Q V BURL/ V BURH LEB OLP NC 4 Reset V SD Min.20V OVP ILIM S R TSD Rsense Vth Q A/R 1 GND Figure 2. Functional Block Diagram of FSDM311 2 FSDM311 Pin Definitions Pin Number 1 Pin Name GND Pin Function Description Sense FET source terminal on primary side and internal control ground. Positive supply voltage input. Although connected to an auxiliary transformer winding, current is supplied from pin 5 (Vstr) via an internal switch during startup (see Internal Block Diagram section). It is not until Vcc reaches the UVLO upper threshold (9V) that the interna