原标题：Cirrus CS1500 90W高效PFC电源参考设计

　　Cirrus 公司的CS1500 是适用于通用输入的高性能功率修正因素(PFC)控制器,采用有所有权的数字算法的不连续导通模式(DCM),具有可变的接通时间和可变频率控制,从而保证PFC为一. CS1500的保护特性包括过压,过流,超功率,开路和短路以及超温保护,主要用在电源和照明镇流器设计.本文介绍了CS1500主要特性,方框图,基本应用电路和材料清单,以及90W高效PFC LLC谐振转换器参考设计电路图和材料清单(BOM).

　　Digital Power Factor Correction IC

　　The CS1500 is a high-performance power factor correction (PFC) controller for universal AC input, which uses a proprietary digital algorithm for discontinuous conduction mode (DCM) with variable on-time and variable frequency control, ensuring unity power factor.

　　The CS1500 incorporates all the safety features necessary for robust and compact PFC stages. In addition, it has burst mode control to lower the light-load/standby losses to a minimum.

　　Protection features such as overvoltage, overcurrent, overpower, open- and short-circuit protection, overtemperature, and brownout help protect the device during abnormal transient conditions.

　　The digital controller optimizes the system stability and transient performance, simplifies the PFC design, reduces the external component count and BOM costs. The simple design and minimum cost makes CS1500 the ideal choice for PFC up to 300 watts.

　　CS1500主要特性:

　　Digital EMI Noise Shaping

　　Excellent Efficiency Under All Load Conditions

　　Minimal External Devices Required

　　Optimized Digital Loop Compensation

　　Comprehensive Safety Features

　　• Undervoltage Lockout (UVLO)

　　• Output Overvoltage Protection

　　• Input Current Limiting

　　• Output Overpower Protection

　　• Input Brownout Protection

　　• Open/short Loop Protection for IAC & FB Pins

　　• Thermal Shutdown

　　图1.CS1500方框图

　　图2.CS1500基本应用电路图

　　应用电路中元件数值表:

　　90W高效PFC LLC谐振转换器参考设计

　　CS1500 90W, High-efficiency PFC w/ LLC Resonant Converter Reference Design

　　The CRD1500-90WLLC circuit has two stages: a digitally controlled front-end PFC and a resonant LLC converter. The CS1500 is a high-performance power factor correction (PFC) controller for universal AC input that uses a proprietary digital algorithm with variable ontime, variable frequency, & DCM, which ensures unity power factor.

　　The resonant LLC converter uses the L6599A controller in the second stage.

　　90W高效转换器参考设计主要特性:

　　Universal Input

　　– Mains Range: 90~265 VAC

　　– Line Frequency: 45~65 Hz

　　Rated Output Specification: 19 V, 90 W

　　EN6100-3-2 Class-D Compliance

　　Efficiency: 91% @ 90 W, 230 VAC

　　Low No-load Power Dissipation

　　Low PFC Component Count

　　Board Dimension: 61 mm x 135 mm

　　图3.90W高效PFC LLC谐振转换器参考设计外形图

　　图4.参考设计电路图(1)

　　图5.参考设计电路图(2)

　　参考设计材料清单(BOM):