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Re: [N8VEM-S100:2045] Voltage Regulator

On 11/13/2013 10:07 AM, David Riley wrote:

On Nov 13, 2013, at 11:38 AM, monahanz <mon...@vitasoft.org> wrote:


Excuse the above quick comment. I re-read the post.  Do I
understand it that for currents near 2 amps and above we are better
going with TO-3's.   Using an 8 to 8.5V input.


In general, a TO-3 will handle high current better, but they're also
designed to be attached to much bigger heatsinks if necessary (e.g.
ones that cover the side of an entire chassis).  You're not going to
get significantly better thermal performance out of a TO-3 attached
to a small heatsink than you will out of a TO-220 attached to a
similarly sized one (though it is obviously better than zero
benefit).


- Dave



There are a number of manufacturer that make switching power supply
modules that 'fit' TO-220 pads.

I've used the TI PT78HT205 previously. Not cheap but worked fine. I
notice that it seems to obsolete now.

Digikey and Mouser have 78SR5 modules that are fairly inexpensive
($4.30) and are rated 1.5A and 2.0A. At 95% conversion efficiency, heat
sinking would be a moot point.

<http://www.mouser.com/ds/2/281/oki-78sr-56393.pdf>
<http://www.mouser.com/ds/2/281/mpm_78sr-2a_a00-42390.pdf>

... just a thought.

Rob.