[sdiy] Best way to get a +3.3V rail from +15V?

[Neil Johnson]

blacet wrote:
> Just as an example, I've used a 33 ohm 1W resistor in line with a LM317T
> (with very small heatsink) on a board needing 5V @ 150 mA from 15V. Both
> the resistor and regulator get quite warm; too hot to touch for very long
> but well under the max operating temp.
>
> The switching regulators are attractive except for they all seem to be
> very small surface mount.

Except this one:

http://www.rapidonline.com/Electrical-Power/R-783-3-1-0-Sgl-Out-Converter-Sil-84-2572

And I've use NatSemi "SimpleSwitcher" devices before.  Very easy to
use and available in through-hole parts.  The LM2575 or TL2575 is a
good one.

Neil
-- 
Modules and more: http://www.cesyg.com
Homepage: http://www.njohnson.co.uk