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AN4105

更新时间： 2024-11-14 03:18:47

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		转换器开关
页数	文件大小	规格书
22页	369K
描述
Design Considerations for Switched Mode Power Supplies Using A Fairchild Power Switch (FPS) in a Flyback Converter

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AN4105 数据手册

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Application Note AN4105

Design Considerations for Switched Mode Power

Supplies Using A Fairchild Power Switch (FPS) in a

Flyback Converter

power MOSFET (SenseFET) and pulse width modulation

Introduction

(PWM) based control IC in one package. Moreover, they

Flyback switched mode power supplies (SMPS) are among

provide enhanced IC functionality, thereby minimizing the

the most frequently used power circuits in household and

number of additional components needed in an SMPS.

consumer electronics. The basic function of an SMPS is to

Fairchild Power Switch (SPS) ICs are widely used in the

supply regulated power to the load on the secondary, or

power circuits of a variety of equipment, such as color TVs,

output side. An SMPS typically incorporates a power

printers, PCs, monitors, battery chargers and ac adapters.

transformer, secondary-side rectifier diodes, a switching

semiconductor device with control IC, and peripheral

They typically incorporate a variety of enhanced protection

functions and they permit

consumption in standby modes.

a much reduced power

circuitry. If the level of integration of the switching and

control circuitry is not high enough, then additional, separate

circuits will be required to accommodate all functions. Such

additional components raise the overall SMPS cost and not

uncommonly reduce reliability.

This application note considers the three major functional

blocks of an SMPS: Fairchild Power Switch (SPS) , flyback

converter, and transformer. It discusses a variety of issues

important to their design and use in the overall SMPS.

Fairchild Power Switches are highly-integrated ICs for

power supply applications. They combine a high-voltage

#3 Vcc

32V

Voltage

Ref.

6.3V

2uA

Sync.

UVLO

Vck

1mA

OSC.

Feedback

Drain

2.5R

Soft Start

& Sync.

Source

GND

LEB

Voffset

Rsense

Sense

Reset

Sense

FET

7.5V

Thermal

Protection

Reset

OVP

Control IC

Figure1. Internal block diagram of a Fairchild Power Switch(FPS).

Rev. 1.0.2

12 3 4 5 6 7...22

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