Datasheet > AN904

AN904

更新时间： 2022-11-25 11:11:40

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		放大器控制器
页数	文件大小	规格书
4页	64K
描述
MAGNETIC AMPLIFIER WITH LPR30 CONTROLLER

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AN904 数据手册

AN904

APPLICATION NOTE

MAGNETIC AMPLIFIER WITH LPR30 CONTROLLER

by F. Lentini & T. Sampieri

Proper regulation is important in multiple output power supplies where the individual outputs must be

tightly controlled.

The continuing need for more compact and reliable switching power supplies has aroused renewed in-

terest in a well founded control technique: THE MAGNETIC AMPLIFIER.

THE MAGNETIC AMPLIFIER ( shortly written MAG -AMP ), means higher density, simpler control circuit

and higher running frequency in Switching Power Supply.

The MAG AMP is suitable for controlling individual outputs ranging from a few watts to over 100 watts in

power converters whose frequencies range from 20KHz to several hundred KHz.

Picture 1 shows the best application of the MAG AMP is in the Switched - Mode Power Supplies .

By using such a square - loop core to provide a controllable delay at the leading edge of the pulses at

the secondary of the transformer, one or more outputs can be independently and precisely regulated

without the losses inherent in linear regulators or the complexity of conventional switching regulators. In

cases where the load currents of the subordinate outputs are high ( more than 2 - 3 Amps ), the advan-

tages of the saturable regulators become more significant.

Figure 1. Multiple-Output Switched-Mode Power Supplies.

FEEDBAK

V+

MAIN Vout

REGULATOR

AUXILIAR 1

Vout

PWM

REGULATOR

DRIVER

AUXILIAR 2

Vout

December 1997

1/3

12 3 4

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