AN904 APPLICATION NOTE MAGNETIC AMPLIFIER WITH LPR30 CONTROLLER
by F. Lentini & T. Sampieri
Proper regulation is import...
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
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AN904 APPLICATION NOTE
Figure...