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AN-6026

更新时间： 2022-10-09 17:36:45

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		功率因数校正
页数	文件大小	规格书
23页	346K
描述
Design of Power Factor Correction Circuit

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AN-6026 数据手册

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Application Note AN-6026

Design of Power Factor Correction Circuit Using FAN7529

FAN7527B; however, the sensing network can cause addi-

1. Introduction

tional power loss. In the voltage mode, the switch turn-on is

The FAN7529 is an active power factor correction (PFC)

the same as that of the current mode, but the switch turn-off

controller for the boost PFC application that operates in the

is determined by an internal ramp signal. The ramp signal is

critical conduction mode (CRM). The critical conduction

compared with an error amplifier output and the switch turn-

mode boost power factor converter operates at the boundary

on time is controlled to be constant, as shown in Figure 1. If

of continuous conduction mode and discontinuous conduc-

the turn-on time is constant, the peak inductor current is pro-

tion mode. The CRM PFC controllers are of two kinds: the

portional to the rectified AC line voltage, as shown in Figure

current-mode CRM PFC controller and the voltage-mode

2. In this way, the input current waveform follows the wave-

CRM PFC controller. For the current mode, a boost switch is

form of the input voltage, thereby obtaining a good power

turned on when the inductor current reaches zero and turned

factor. The FAN7529 is a voltage-mode CRM PFC control-

off when the inductor current meets the desired current refer-

ler. Because the voltage-mode CRM PFC controller does not

ence. In this case, the rectified AC line voltage should be

need the rectified AC line voltage information, it can save

sensed to generate the current reference, as in the

the power loss of the sensing network.

VVOUT

OUT

AACC

IIN

TTuurrnn--OOnn

OOCPP

TTuurrnn--OOffff

RR_SSENNSSEE

FFeeeeddbbaacckk

OOVVPP

DDiissaabllee

EErrrroorr Ammpp

RRaammpp

Figure 1. Voltage Mode CRM Boost PFC Circuit

Diode

Peak

Conduction

Induc to r

Ind uc to r

Current

Average

Inp ut

Current

MOSFET

Conduction

Gating

Signal

Constant On- time & Variable Off- time

Figure 2. CRM Boost PFC Inductor Current Waveform

Rev. 1.0.4 • 4/25/08

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