From: "Josh Hillman"
Subject: 10A Power supply
Date: Fri, 6 Sep 2002 15:25:44 -0700
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I'm looking for a power supply design around LM317 and 2N3055. I found
something on the web that says:
"I don't know what circuit you are working from, but a crude high-power
linear regulator can be made by taking the output from the LM317 and
connecting it to the base of a high power NPN (like a 2n5686 or 2n3055),
with the collector connected to the input of the LM317, and the emitter used
as the output. The regulation is not great, as the output will drop by the
base-emitter voltage of the transistor (0.7 v typically) under load, and the
power dissipated by the transistor and the LM317 can be large, depending on
your input voltage, i.e. watts dissipated = ((Vin - Vout) * Current). You
may need a large heatsink and a fan. The DC current gain of the transistor
times the LM317 output current will determine the output current capability.
Is that a workable solution? Has someone seen a similar better design?
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