原标题：Fairchild FSL336LR最高效率开关电源解决方案

　　Fairchild公司的FSL336LR是650 V Green Mode降压开关,具有最高的电源效率和系统设计灵活性.器件集成了PWM和SenseFET,高压电源稳压器以及跨导放大器,降低外接元件和不需要辅助偏压线圈,固定工作频率50kHz,具有多种保护如过流保护(OLP),过压保护(OVP),反馈开路保护(FB­_OLP)和热关断(TSD),主要用在多种设备的开关电源.本文介绍了FSL336LR主要特性,框图,7W参考设计主要指标, 变压器主要指标,电路图,材料清单和PCB元件布局图.

　　The FSL336LR integrated Pulse Width Modulator (PWM) and SenseFET is specifically designed for high-performance offline buck, buck-boost, and non-isolation flyback Switched Mode Power Supplies (SMPS) with minimal external components. This device integrates a high-voltage power regulator that enables operation without auxiliary bias winding. An internal transconductance amplifier reduces external components for the feedback compensation circuit.

　　The integrated PWM controller includes: 10 V regulator for no external bias circuit, Under-Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), an optimized gate turn-on / turn-off driver, EMI attenuator, Thermal Shutdown (TSD), temperature-compensated precision current sources for loop compensation, and fault-protection circuitry. Protections include: Overload Protection (OLP), Over-Voltage Protection (OVP), and Feedback Open Loop Protection (FB_OLP). FSL336LR offers good soft-start performance during startup.

　　The internal high-voltage startup switch and the Burst-Mode operation with very low operating current reduce the power loss in Standby Mode. As the result, it is possible to reach power loss of 120 mW without external bias and 25 mW with external bias when input voltage is 230 VAC.

　　FSL336LR主要特性:

　　Built-in Avalanche-Rugged SenseFET: 650 V

　　Fixed Operating Frequency: 50 kHz

　　No-Load Power Consumption:

　　25 mW at 230 VAC with External Bias;

　　120 mW at 230 VAC without External Bias

　　No Need for Auxiliary Bias Winding

　　Frequency Modulation for Attenuating EMI

　　Pulse-by-Pulse Current Limiting

　　Ultra-Low Operating Current: 250 µA

　　Built-in Soft-Start and Startup Circuit

　　Adjustable Peak Current Limit

　　Built-in Transconductance (Error) Amplifier

　　Various Protections: Overload Protection (OLP), Over-Voltage Protection (OVP), Feedback Open-Loop Protection (FB_OLP), Thermal Shutdown (TSD)

　　Fixed 650 ms Restart Time for Safe Auto-Restart of All Protections

　　FSL336LR 应用:

　　• AC-DC Merchant Power Supply

　　• Consumer Appliances

　　• DVD

　　• DVD/Set Top Boxes

　　• Energy Generation & Distribution

　　• Game Console

　　• Home Audio System Components

　　• Industrial Motor

　　• Medical Electronics/Devices

　　• Motion

　　• Motion Control - Home Appliance

　　• Motion Control - Home Appliance/Industrial Motor

　　• Motion Control - Industrial Motor

　　• Motion-Industrial motor

　　• Other Audio & Video

　　• Other Consumer Electronics

　　• Other Consumer Products

　　• Other Industrial

　　• Printer

　　• Routers & LAN Switches

　　• Safety and Control

　　• Set Top Boxes

　　• Smart Grid

　　• Smart Meter

　　• STB

　　• Uninterruptible Power Supply

　　• Video Game Console

　　图1. FSL336LR框图

　　FSL336LR参考设计主要指标:

　　图2. FSL336LR 7W参考设计外形图:上:顶视图;下:底视图

　　FSL336LR 7W参考设计变压器主要指标:

　　FSL336LR 7W参考设计材料清单: