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Article #15625

Voltage regulators in parallel?

#15625
From: John Purbrick
Date: Thu, 17 Dec 1992 06:10
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I want to set up a power supply delivering more current than an integrated
voltage regulator (LM78xx if fixed, or LM317 if variable) will provide. It
seems valid to parallel as many of the relevant component as I need to get
the current; certainly they won't all pass the same current, and the voltage
out will drop if the initially-highest regulator starts to overload, but it
should settle to some lower voltage as other regulators start to conduct 
more. It seems that this would apply whether the overload was caused by 
overcurrent or overheating. And when all the regulators are conducting, the 
output should be no lower than the lowest output would have been if they were 
wired individually.

Is there a flaw here? I can't find a reason why it won't work, but something
about it doesn't feel right.

John Purbrick
jpexg@lcs.mit.edu
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From: jpexg@gaak.LCS.MIT.EDU (John Purbrick)
Newsgroups: sci.electronics
Subject: Voltage regulators in parallel?
Date: 17 Dec 1992 00:10:02 -0600
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