原标题：Fairchild FSL206MR 5W辅助电源解决方案

　　Fairchild 公司的FSL206MR集成了PWM和SenseFET,特别适用外接元件最少的高性能离线开关电源(SMPS).内部的SenseFET耐压650V,固定工作频率67kHz,265VAC无偏压绕组的无负载功耗小于150mW,具有多种保护,主要用在STB,DVD和DVCD播放器的开关电源,辅助电源.本文介绍了FSL206MR主要特性,方框图,典型应用电路图以及FSL206MR 5W评估板主要指标,电路图,材料清单和PCB布局图.

　　The FSL206MR integrated Pulse-Width Modulator (PWM) and SenseFET is specifically designed for high performance offline Switched-Mode Power Supplies (SMPS) with minimal external components. This device integrates high-voltage power regulators that combine an avalanche-rugged SenseFET with a Current-Mode PWM control block.

　　The integrated PWM controller includes: 7.8V regulator for no bias winding, Under-Voltage Lockout (UVLO) protection, Leading-Edge Blanking (LEB), an optimized gate turn-on/turn-off driver, EMI attenuator, Thermal Shutdown (TSD) protection, temperature-compensated precision current sources for loop compensation, and fault-protection circuitry such as; Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), and Line Under-Voltage Protection (LUVP). During startup, the FSL206MR offers good soft-start performance.

　　The internal high-voltage startup switch and the Burst-Mode operation with very low operating current reduce the power loss in Standby Mode. As a result, it is possible to reach power loss of 150mW with no-bias winding and 25mW (for FSL206MR) or 30mW (for FSL206MRBN) with bias winding at no-load condition when the input voltage is 265VAC.

　　FSL206MR主要特性:

　　Internal Avalanche-Rugged SenseFET: 650V

　　Precision Fixed Operating Frequency: 67kHz

　　No-Load <150mW at 265VAC without Bias Winding;<25mW with Bias Winding for FSL206MR, <30mW with Bias Winding for FSL206MRBN

　　No Need for Auxiliary Bias Winding

　　Frequency Modulation for Attenuating EMI

　　Line Under-Voltage Protection (LUVP)

　　Pulse-by-Pulse Current Limiting

　　Low Under-Voltage Lockout (UVLO)

　　Ultra-Low Operating Current: 300A

　　Built-In Soft-Start and Startup Circuit

　　Various Protections: Overload Protection (OLP),Over-Voltage Protection (OVP), Thermal Shutdown (TSD), Abnormal Over-Current Protection (AOCP) Auto-Restart Mode for All Protections

　　FSL206MR应用:

　　SMPS for STB, DVD, and DVCD Player

　　SMPS for Auxiliary Power

　　图1.FSL206MR方框图

　　图2.FSL206MR典型应用电路图

　　FSL206MR 5W评估板

　　5W电源主要指标:

　　图3.FSL206MR 5W评估板外形图

　　图4.FSL206MR 5W评估板电路图

　　FSL206MR 5W评估板材料清单: