高效250W PFC电源解决方案.doc

Cirrus CS1501高效250W PFC电源解决方案Cirrus公司的CS1501是高性能数字功率因素修正(PFC)控制器,它能动态管理PFC,从而在很宽负载范围内得到高效率.CS1501具有零电压开关拓扑,欠压锁住(UVLO),输出过压保护,逐个周期的限流,开路/短路保护和热关断,主要用在LCD和LEDTV,笔记本电脑,服务器/通信设备.本文介绍了CS1501主要特性,方框图,典型应用电路图以及CS1501 250W高效PFC演示板主要特性,电路图,材料清单和PCB元件布局图表.The CS1501 is a high-performance digital power factor correction (PFC) controller designed for switching mode power supply (SMPS) applications. The CS1501 activELy manages the power factor correction while achieving high efficiency over a wide load range.The CS1501 adaptively controls the input AC current so that it is in phase with the AC mains voltage, and its waveform mimics the input voltage waveform. The PFC controller executes adaptive digital algorithms designed to shape the AC mains input current waveform to be in phase with the input voltage waveform.The CS1501 is equipped with a zero-current detection (ZCD) circuit providing the PFC digital controller the capability to turn on the MOSFET when the voltage across the drain and source is near zero. Additionally, a current-sensing circuit is incorporated for instantaneous overcurrent protection.CS1501主要特性: Digital EMI Noise Shaping Adaptive Digital Energy Controller Excellent Efficiency Under All Load and Line Conditions Zero-voltage Switching Topology Minimal External Devices Required Adaptive Digital Control Loop Comprehensive Safety Features Undervoltage Lockout (UVLO) Output Overvoltage Protection Cycle-by-cycle Current Limiting Open/Short Loop Protection for IAC & IFB Pins Thermal Shutdown Pin Placement Similar to Traditional Boundary Mode (CRM) ControllersCS1501应用:q LCD and LED TVsq Notebooksq Server/Telecom图1.CS1501方框图图2.CS1501典型应用电路图S1501 250W高效PFC演示板The CDB1501-250W board demonstrates the performance of the CS1501 digital PFC controller with a 250 Watt output at a link voltage of 400 volts.The CDB1501-250W board demonstrates the performance of the CS1501 with input voltage range of 90-265 VAC, typically seen in universal input applications. This board has been designed for a Vlink of 400V, 250 Watts, full load.Extreme caution needs to be exercised while handling this board. This board is to be used by trained professionals only. Prior to applying AC power to the CDB1501-250W board, the CS1501 needs to be biased using an external 13 VDC power supply.This document provides the schematic for the board. It includes oscilloscope screen shots that indicate operating waveforms. Graphs are also provided that document the performance of the board in terms of Efficiency vs. Load, Total Harmonic Distortion vs. Load, and Power Factor vs. Load for the CS1501 PFC controller IC.CS1501 250W高效PFC演示板主要特性:q Variable On Time, Variable Frequency, DCM PFC Controllerq Line Voltage Range: 90 to 265VAC RMSq Output voltage: 400Vq Rated Pout: 250Wq Efficiency: 96.5% 250W, 220VACq No-load Power Dissipation: 0.3Wq Low Component Countq Supports Cirrus Logic Prod