Datasheet > FQPPF9N50C

FQPPF9N50C

更新时间： 2024-11-25 10:23:35

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		功率因数校正控制器
页数	文件大小	规格书
17页	613K
描述
PFC+PWM Combination Controller

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FQPPF9N50C 数据手册

www.fairchildsemi.com

AN-8027

FAN480X PFC+PWM Combination Controller Application

FAN4800A / FAN4800C / FAN4801 / FAN4802 / FAN4802L

Introduction

The synchronization of the PWM with the PFC simplifies

the PWM compensation due to the controlled ripple on the

This application note describes step-by-step design

considerations for a power supply using the FAN480X

controller. The FAN480X combines a PFC controller and

a PWM controller. The PFC controller employs average

current mode control for Continuous Conduction Mode

(CCM) boost converter in the front end. The PWM

controller can be used in either current mode or voltage

mode for the downstream converter. In voltage mode,

feed-forward from the PFC output bus can be used to

improve the line transient response of PWM stage. In

either mode, the PWM stage uses conventional trailing-

edge duty cycle modulation, while the PFC uses leading-

edge modulation. This proprietary leading/trailing-edge

modulation technique can significantly reduce the ripple

current of the PFC output capacitor.

PFC output capacitor (the PWM input capacitor). In

addition to power factor correction, a number of protection

features have been built in to the FAN480X. These include

programmable soft-start, PFC over-voltage protection,

pulse-by-pulse current limiting, brownout protection, and

under-voltage lockout.

FAN4801/2/2L feature programmable two-level PFC

output to improve efficiency at light-load and low-line

conditions.

FAN480X is pin-to-pin compatible with FAN4800 and

ML4800, only requiring adjustment of some peripheral

components. The FAN480X series comparison is

summarized in the Appendix A.

V_BOUT

F₁

L _BOOST

D_BOOST

Input

L ¹

L ¹₁

C_BOOST

Q₁

Vo1

R_FB1

C_IF1

D_R1

Q₂

Drv

D_F1

C_O12

C_O11

R_CS1

R_RAMP

L₂₂

Vo2

L ²

D_F2

D_R2

C_O21

C_O22

Q₃

D_R2

Drv

R_LF2

R_CS2

C_IC2

R_IAC

R_LF1

C_IC1

R_IC

R_RMS1

R_D

R_T

VEA

IEA

C_RMS1

FBPFC

IAC

R_B

R_BIAS

R_RMS2

ISENSE

VREF

V ^D

C_F

VRMS

R_OS1

R_F

R_VC

C_LF1

C_SS

OPFC

C_RMS2

R_RMS3

FBPWM

RT/CT

RAMP

OPWM

C_VC2

Vo2

GND

R_OS2

R_OS3

C_T

ILIMIT

C_VC1

FAN480X

C_RAMP

R_FB2

C_B

C_FB

C_LF2C_DDC_REF

Figure 1. Typical Application Circuit of FAN480X

Rev. 1.0.0 • 8/26/09

www.fairchildsemi.com

12 3 4 5 6 7...17

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