描述 Description

General Description
The FAN4822 is a PFC controller designed specifically for high power applications. The controller contains all of the functions necessary to implement an average current boost PFC converter, along with a Zero Voltage Switch (ZVS) controller to reduce diode recovery and MOSFET turn-on losses.
The average current boost PFC circuit provides high power factor (98%) and low Total Harmonic Distortion (THD). Built-in safety features include undervoltage lockout, over voltage protection, peak current limiting, and input voltage brownout protection.
The ZVS control section drives an external ZVS MOSFET which, combined with a diode and inductor, soft switches the boost regulator. This technique reduces diode reverse recovery and MOSFET switching losses to reduce EMI and maximize efficiency.

特性 Features

? Average current sensing, continuous boost, leading edge
?? PFC for low total harmonic distortion and near unity
?? power factor
? Built-in ZVS switch control with fast response for high
?? efficiency at high power levels
? Average line voltage compensation with brownout control
? Current fed gain modulator improves noise immunity and
?? provides universal input operation
? Overvoltage comparator eliminates output “runaway” due
?? to load removal
? UVLO, current limit, and soft-start
? Precision 1.3% reference

簡介

FAN4822屬于集成電路（IC）的PFC（功率因數(shù)校正）。由制造生產(chǎn)的FAN4822PFC（功率因數(shù)校正）功率因數(shù)校正 (PFC) 是用于調(diào)整交流電路中的電壓和電流之間的相位角，使之趨近于零的半導(dǎo)體器件。不同模式包括平均電流、邊界導(dǎo)通、連續(xù)導(dǎo)通、臨界導(dǎo)通、電流控制式頻率折返、不連續(xù)和不連續(xù)導(dǎo)通，開關(guān)頻率從 6 kHz 至 1.7 MHz 可調(diào)。