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From: "Roger N"
Subject: Re: Constant Current Sw Regulation?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Thu, 21 Nov 2002 20:43:23 GMT
NNTP-Posting-Date: Thu, 21 Nov 2002 12:43:23 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
"Bob Wilson" wrote in message
> This is the simplest type of converter topology, and the one with the
> greatest number of disadvantages. Why would you use it, when a normal
> PWM-driven buck with current sensing and feedback works just fine. No
> need to reinvent a wheel that works already!
Do you have any part numbers in mind that I could look up? I have looked up
several switching regulators and find that they don't go low enough in
voltage and/or they they are set up with inductors for a specific voltage.
I know the circuit I am looking for it it were a linear design, something
like a LM317 with a 1.25 ohm resistor, giving 1A constant current. I think
this would get too hot if I drop 23V @ 1A across the regulator while
charging a 1.2V battery, besides wasting the energy out of what may be a
field 12V gell cell of 5-7AH capacity. So, is there a switching version of
the LM317 that I could use a 1.25 ohm resistor and get a constant 1A over a
0 to ~24V range?
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