Datasheet > AN-6206

AN-6206

更新时间： 2022-10-09 17:37:47

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		/
页数	文件大小	规格书
9页	546K
描述
Primary-Side Synchronous Rectifier (SR) Trigger Solution for Dual-Forward Converter

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

AN-6206 数据手册

www.fairchildsemi.com

AN-6206

Primary-Side Synchronous Rectifier (SR) Trigger Solution

for Dual-Forward Converter

Introduction

In any switching converter, rectifier diodes are used to

obtain DC output voltage. The conduction loss of diode

rectifier contributes significantly to the overall power losses

in a power supply; especially in low output voltage

applications, such as personal computer (PC) power

supplies. The conduction loss of a rectifier is proportional to

the product of its forward-voltage drop and the forward

conduction current. Using synchronous rectification (SR)

where the rectifier diode is replaced by MOSFET with

proper on resistance (Rds_ON), the forward-voltage drop of a

synchronous rectifier can be lower than that of a diode

rectifier and, consequently, the rectifier conduction loss can

be reduced.

signals for the secondary-side SR driver FAN6206.

FAN6210 also provides drive signal for the primary-side

power switches by using an output signal from the PWM

controller. FAN6210 can be combined with any PWM

controller that can drive a dual-forward converter. To obtain

optimal timing for the SR drive signals, transformer winding

voltage is also monitored. To improve light-load efficiency,

green-mode operation is employed, which disables the SR

turn-on trigger signal, minimizing gate drive power

consumption at light-load condition.

This application note describes the design procedure of SR

circuit using FAN6210 and FAN6206. The guidelines for

printed circuit board (PCB) layout and a design example

with experiment results are also presented.

The highly integrated FAN6210 is a primary-side SR

controller for dual-forward converter that provides control

V_in

PFC stage

V_ac

C_bulk

L_o

V_o

Drv

n:1

R₈

Q₂

D₁

R₂

R₉

Q₁

FAN6210

SIN

GND

SOUT

VDD

R₆

R₇

Drv

PWM control signal

(From PWM controller)

FAN6206

RDLY DET

C₁

D₂

R₁

LPC1

GATE1

From power supply

of PWM controller

LPC2 GND

D₅

D₃

D₄

R₃

GATE2

VDD

C₂

R₅

D₆

R₄

Figure 1. Typical Application

Rev. 1.0.0 • 4/27/10

www.fairchildsemi.com

12 3 4 5 6 7...9

下载PDF

与AN-6206相关器件

型号	品牌	描述	获取价格	数据表
AN-6208	FAIRCHILD	Secondary-Side Synchronous Rectifier (SR) for LLC Resonant Converter	获取价格
AN6209	PANASONIC	RECORDING AND PLAYBACK CIRCUITS FOR TAPE RECORDERS AND VTRS	获取价格
AN6209S	PANASONIC	RECORDING AND PLAYBACK CIRCUITS FOR TAPE RECORDERS AND VTRS	获取价格
AN6210	PANASONIC	DUAL RECORDING AND PLAYBACK AMPLIFIER CIRCUIT FOR STEREO TAPE RECORDERS	获取价格
AN6212	ETC	Record/Playback Amp for Audio Tape Recorder	获取价格
AN6213	ETC	Record/Playback Amp for Audio Tape Recorder	获取价格