NCP1611中文资料Critical Conduction Mode (CrM) Power Factor Controller数据手册ONSEMI规格书

描述 Description

The NCP1611 is active power factor corrected (PFC) controller specifically designed for use as a boost preconverter in ac-dc adapters, flat TVs, lighting ballasts and other medium powered offline applications.The controller is based on an innovative Current Controlled Frequency Foldback(CCFF) method. In this mode, the circuit classically operates in Critical conduction Mode (CrM) when the inductor current exceeds a programmable value. When the current is below this preset level, the NCP1611 linearly reduces the frequency down to about 20 kHz when the current is at a null. CCFF maximizes the efficiency at both nominal and light load. In particular, the standby losses are reduced to a minimum.The controller features a robust suite of protection features to properly handle an array of power supply operating and fault conditions.

特性 Features

• Critical Conduction mode with current controlled frequency foldback
• Optimizes conversion efficiency across load range
• Dynamic Response Enhancer
• Improved transient response for line and load steps
• Soft Overvoltage Protection (S-OVP)
• Reduces accoustic noise and stress in the even of an overvoltage fault
• -500 mA/+800 mA Drive Capability
• High drive to support wide range of FETS and power levels
• Valley Turn On
• Improved efficiency and reduced EMI generation
• Wide Vcc Range of 9.5-35V
• Easy to Bias even at light load and high line conditions
• Two Vcc Startup Versions: 10.5V (A) and 17V (B)
• B version allows smaller Vcc capacitor and faster startup in self biased applications
• AC Line Brownout Detection
• Protect boost stage from fault conditions
• Saturated Inductor and shorted boost or bypass protection
• Enhances safe operating monitoring without extra components
• Open Pin Protection including Ground
• Enhanced fault handling
• Undervoltage and Fast Over voltage protection
• Robust safety handling
• Near Unity Power Factor
• Cycle-by-cycle current protection

应用 Application

• Offline Power Supplies
• Lighting Ballasts
• Flat TVs
• All-in-one Computers
• High Powered Adapters
• LED Lighting Power Supplies and Drivers
• Dimmable Fluorescent Ballasts
• LED Lighting

简介

NCP1611属于集成电路（IC）的PFC（功率因数校正）。由制造生产的NCP1611PFC（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。