ML4812CQ中文资料Power Factor Controller数据手册ONSEMI规格书

描述 Description

GENERAL DESCRIPTION
The ML4812 is designed to optimally facilitate a peak current control boost type power factor correction system. Special care has been taken in the design of the ML4812 to increase system noise immunity. The circuit includes a precision reference, gain modulator, error amplifier, over voltage protection, ramp compensation, as well as a high current output. In addition, start-up is simplified by an under-voltage lockout circuit with 6V hysteresis.
In a typical application, the ML4812 functions as a current mode regulator. The current which is necessary to terminate the cycle is a product of the sinusoidal line voltage times the output of the error amplifier which is regulating the output DC voltage. Ramp compensation is programmable with an external resistor, to provide stable operation when the duty cycle exceeds 50%.FEATURES
■ Precision buffered 5V reference (±0.5%)
■ Current-input gain modulator reduces external
   components and improves noise immunity
■ Programmable ramp compensation circuit
■ 1A peak current totem-pole output drive
■ Overvoltage comparator helps prevent output
   voltage “runaway”
■ Wide common mode range in current sense
   comparators for better noise immunity
■ Large oscillator amplitude for better noise immunity

特性 Features

■ Precision buffered 5V reference (±0.5%)
■ Current-input gain modulator reduces external
   components and improves noise immunity
■ Programmable ramp compensation circuit
■ 1A peak current totem-pole output drive
■ Overvoltage comparator helps prevent output
   voltage “runaway”
■ Wide common mode range in current sense
   comparators for better noise immunity
■ Large oscillator amplitude for better noise immunity

简介

ML4812CQ属于集成电路（IC）的PFC（功率因数校正）。由制造生产的ML4812CQPFC（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。