NCP1612数据手册集成电路（IC）的PFC（功率因数校正）规格书PDF

描述 Description

The NCP1612 is active power factor corrected (PFC) controller specifically designed for use as a boost pre-converter 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 NCP1612 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.This device is particularly suited a PFC stage for LLC controllers due to its dedicated PFC_Okay Output.

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
• Reduces accoustic noise and stress in the event of an overvoltage fault
• -500 mA/+800 mA Drive Capability
• Supports wide range of MOSFETs and power levels
• Valley turn on
• Improved efficiency amd reduced EMI generation
• Wide Vcc Range of 9.5-35 Vdc
• Easy to bias even under light load or high line conditions
• Two Vcc startup versions: 10.5 V (A) and 17 V (B)
• B version allows smaller Vcc capacitor and faster startup in self biased applications
• AC Line Brownout Detection
• Protects boost stage power components during line fault conditions
• Cycle-by-cycle switch current monitoring
• Enhances system robustness
• Saturated inductor and shorted boost or bypass diode detection
• Enhanced safety monitoring without extra components
• PFC Okay Output
• Can enable downstream controller of stable PFC rail
• Latch Off Input
• Simplifies implemented latch protection for power supply
• Independent bulk overvoltage and undervoltage monitoring
• Increased system reliablity
• Open Ground Pin Fault Monitoring
• Simplifies safety testing
• Near Unity Power Factor
• Thermal Shutdown

应用 Application

• Offline Power Supplies
• Lighting Ballasts
• LED Lighting Drivers and Power Supplies
• Flat TV
• All-In-One Computers
• High Powered Adapters
• LED Lighting

简介

NCP1612属于集成电路（IC）的PFC（功率因数校正）。由制造生产的NCP1612PFC（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。