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[DPRG] Switching Power Supply
Subject: [DPRG] Switching Power Supply
From: Chuck McManis
cmcmanis at mcmanis.com
Date: Mon Mar 26 16:29:47 CDT 2007
So if you Google for "Simple Switcher" and go to the National site they have
an online design tool that lets you plug in your requirements and it pops
out a SMPSU design. I put in Ed's parameters and it gave me a design that
could actually do 1.5a @ 5V from 7 - 35v. The challenge of course is that
the parts cost (qty1) are about $37.50. The good news is if you sign up they
will send you a demo board for free ;-).
I like the simple switchers, I've used them in a number of designs. They are
very robust and while you can't do a "7805" foot print with them you can do
a "7805-molex-plug" by which I mean you substitute a 3 pin molex plug for
your voltage regulator and you can then plug your small board in with this
system.
Additional good news is that you can make it a 3.3v board by changing 1 part
(the level setting resistor).
--Chuck
(no way affiliated with National Semi)
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