Datasheet > FPF08S60SN

FPF08S60SN

更新时间： 2024-09-17 10:23:23

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
15页	676K
描述
Power Factor Correction Converter Design

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FPF08S60SN 数据手册

www.fairchildsemi.com

AN-6982

Power Factor Correction Converter Design with FAN6982

Introduction

The FAN6982 is a 14-pin, Continuous Conduction Mode

(CCM) Power Factor Correction (PFC) controller IC, that

employs leading-edge modulation for average current

control and has a number of advanced features for better

performance and reliability. The variable output voltage

function (range function) reduces PFC output voltage at

light-load and low-line conditions to improve light-load

efficiency, but can be also easily disabled using EN pin.

The RDY signal can be used for power-on sequence

control of the downstream DC/DC converter. A TriFault

Detect™ function helps reduce external components and

provides full protection for feedback loops such as open,

short, and over voltage. FAN6982 also includes PFC soft-

start, peak current limiting, line feed-forward, and input

voltage brownout protection.

This application note describes the theory of operation and

step-by-step design considerations for a power factor

correction power supply using the FAN6982 controller. A

typical application circuit is shown in Figure 1, where the

supply voltage, V_DD, is supplied from a standby auxiliary

power supply and the supply voltage for the downstream

converter is controlled by the RDY pin.

L_BOOST

D_BOOST

V_BOUT

F₁

AC Input

V_OUT

C_IF2

Q₁

R_DRV

C_BOOST

C_IF1

Downstream

DC/DC Converter

R_PL

R_CS

D₁D₂

PWM Controller

v_CC

R_LF

C_IC2

C_IC1

R_FB1

R_RMS1

R_RMS2

R_RMS3

R_IAC

R_IC

C_RMS1

IEA

VEA

FBPFC

VREF

VDD

IAC

R_VC

ISENSE

VRMS

RDY

C_VC2

OPFC

PGND

SGND

C_RMS2

C_LF

R_FB2

C_FBC_VC1

C_DD

RT/CT

FAN6982

R_reg1

Q₂

R_EN

R_T

C_REF

C_T

R_reg2

Range Enabled/Disabled

_EN= V_VREF: Enabled

V_EN= GND : Disabled

R_reg3

C_RDY

From Standby Auxiliary Power Supply

Figure 1. Typical FAN6982 Application Circuit

Rev. 1.0.0 • 6/8/10

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12 3 4 5 6 7...15

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