NCP1937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 power factor correction (PFC) and quasi-resonant flyback functionality necessary to implement a compact and highly efficient Switched Mode Power Supply for an adapter application.The PFC stage exhibits near-unity power factor while operating in a Critical Conduction Mode (CrM) with a maximum 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 quasi-resonant current-mode flyback stage features a proprietary valley-lockout circuitry, ensuring stable valley switching.This system works down to the 4th valley and toggles to a frequency foldback mode with a minimum frequency clamp beyond the 4th valley to eliminate audible noise. Skip mode operation allows excellent efficiency in light load conditions while consuming very low standby power consumption.

特性 Features

•
• Lowest no load performance
• High Voltage Startup Circuit and Active Input Filter Capacitor Discharge Circuitry
• Eliminates the need for an external HV startup circuit and X2 resistors.
• High Voltage Line Voltage Detector
• Optimize performance based on 110 v or 220 V ac mains
• Integrated High Voltage Switch Disconnects PFC Feedback Resistor Divider
• Reduces no load standby power
• Fault Input for Severe Fault Conditions
• Enhanced protection capability
• Bi-Level Line-Dependent Output Voltage
• Optimized system with different input voltages
• Boost Diode Short-Circuit Protection
• Enhanced protection features
• Adjustable PFC Disable Threshold Based on Output Power
• Optimized system to improve efficiency
• Frequency Foldback with Minimum Frequency Clamp
• Enhanced efficiency at light and no load
• Minimum Frequency Clamp
• Eliminates audible noise
• Valley Switching Operation with Valley-Lockout
• Noise free operation
• PFC
• QR Flyback Controller

应用 Application

• Adapters
• Combo PFC+QR
• All-In-One (AIO) Computers
• High Power Notebook Adapters

简介

NCP1937属于集成电路（IC）的PFC（功率因数校正）。由制造生产的NCP1937PFC（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。