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AN904

STMicroelectronics
Part Number AN904
Manufacturer STMicroelectronics
Description MAGNETIC AMPLIFIER
Published Mar 26, 2005
Detailed Description AN904 APPLICATION NOTE MAGNETIC AMPLIFIER WITH LPR30 CONTROLLER by F. Lentini & T. Sampieri Proper regulation is import...
Datasheet PDF File AN904 PDF File

AN904
AN904

Overview
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 interest 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 advantages of the saturable regulators become more significant.
Figure 1.
Multiple-Output Switched-Mode Power Supplies.
FEEDBAK CR + V+ MAIN Vout + CR REGULATOR AUXILIAR 1 Vout CR PWM DRIVER + REGULATOR AUXILIAR 2 Vout - December 1997 1/3 AN904 APPLICATION NOTE Figure 2.
FEEDBAK + V+ CR2 MAIN Vout - SR CR1 L4 Rsense + CR2 PWM DRIVER +6 VIN AUXILIARY Vout 1 8 CR3 + LPR30 3 CURR.
LIM .
LIMLIM+ ERRERR+ 2 7 ERR.
A M P.
6 4 REF VREF 5 GND Figure 3.
V+ SR CR1 L4 CURRENT CONTROL Rsense + CR2 Vout VIN 1 8 +6 PWM CONTROLLER CR3 CR4 LPR30 3 CURR.
LIM.
+ LIMLIM+ ERRERR+ 2 7 ERR.
AMP.
6 4 REF VREF 5 GND LPR30 CONTROLLER Using the LPR30 like controller (as shown in fig.
2) , in the PWM (Auxiliary Outputs) the pulse width is controlled ...


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