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參數(shù)資料
| 型號： | AN4105 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Design Considerations for Switched Mode Power Supplies Using A Fairchild Power Switch (FPS) in a Flyback Converter |
| 中文描述： | 設(shè)計注意事項開關(guān)電源中使用反激轉(zhuǎn)換器的飛兆功率開關(guān)（FPS） |
| 文件頁數(shù)： | 1/22頁 |
| 文件大?。?/td> | 380K |
| 代理商： | AN4105 |
Applic ation Note AN4105
Design Considerations for S witched Mode Power
S upplies Using A Fairchild Power S witch (FPS ) in a
Flyback Converter
Introduction
Flyback switched mode power supplies (SMPS) are among
the most frequently used power circuits in household and
consumer electronics. The basic function of an SMPS is to
supply regulated power to the load on the secondary, or
output side. An SMPS typically incorporates a power
transformer, secondary-side rectifier diodes, a switching
semiconductor device with control IC, and peripheral
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.
www.fairchildsemi.com
2002 Fairchild Semiconductor Corporation
Fairchild Power Switches are highly-integrated ICs for
power supply applications. They combine a high-voltage
power MOSFET (SenseFET) and pulse width modulation
(PWM) based control IC in one package. Moreover, they
provide enhanced IC functionality, thereby minimizing the
number of additional components needed in an SMPS.
Fairchild Power Switch (SPS) ICs are widely used in the
power circuits of a variety of equipment, such as color TVs,
printers, PCs, monitors, battery chargers and ac adapters.
They typically incorporate a variety of enhanced protection
functions and they permit a much reduced power
consumption in standby modes.
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.
Figure1. Internal block diagram of a Fairchild Power Switch(FPS).
#2
Source
GND
#1
Drain
Sense
#4
Feedback
#5
Soft Start
& Sync.
LEB
Rsense
2.5R
R
OSC.
Reset
1mA
2uA
Vck
R
S
Q
6.3V
Sync.
7.5V
5V
R
S
Q
Reset
Voffset
#3 Vcc
Voltage
Ref.
UVLO
32V
OVP
Control IC
Sense
FET
Thermal
Protection
Rev. 1.0.2
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