NCP1927数据手册集成电路（IC）的PFC（功率因数校正）规格书PDF

描述 Description

This combination IC integrates the primary side control blocks - power factor correction (PFC) and flyback controllers with sequencing circuitry - necessary to implement a compact highly efficient Flat Panel TV Switched Mode Power Supply. The PFC controller exhibits near-unity power factor while operating in Critical Conduction Mode (CrM) with an internal frequency clamp. The circuit incorporates all the features necessary for building a robust and compact PFC stage while minimizing the number of external components. The fixed-frequency current-mode flyback controller features a proprietary Soft-Skip™ mode combined with frequency foldback allowing excellent efficiency during light load conditions while achieving very low standby power consumption. Soft-Skip™ dramatically reduces the risk of acoustic noise, therefore allowing the use of inexpensive transformers and capacitors in the clamping network. Frequency jittering and ramp compensation make this controller and excellent fit for converters where ruggedness and components cost are the key constraints.

特性 Features

• Inverter Enable Output
• Shutdown Pin to Disable IC
• Go To Standby Input
• PFC Skip Mode
• Programmable Overvoltage/Undervoltage Protection
• Flyback Frequency Jittering
• Flyback Frequency Foldback
• Timer-Based Overload Protection with Auto-Recovery
• Flyback Soft-Skip

应用 Application

Flat TV power supplies

简介

NCP1927属于集成电路（IC）的PFC（功率因数校正）。由制造生产的NCP1927PFC（功率因数校正）功率因数校正 (PFC) 是用于调整交流电路中的电压和电流之间的相位角，使之趋近于零的半导体器件。不同模式包括平均电流、边界导通、连续导通、临界导通、电流控制式频率折返、不连续和不连续导通，开关频率从 6 kHz 至 1.7 MHz 可调。