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

J. Verhoeven jarno.verhoeven at ziggo.nl
Thu Mar 7 14:27:10 CET 2013


Hi Tom,

Something like this?
http://nl.farnell.com/xp-power/ip1203sa/dc-dc-converter-3w-4-1-i-p3-3v/dp/1859151

I just picked one, they have several types available. I recently bought some 2x15v DC/DC converters for little money on eBay, still need to try them out, those are by Traco Power and SMT.

Jarno.


On 03/07/13, Tom Wiltshire  <tom at electricdruid.net> wrote:
> Hi all,
> 
> I'm putting a little dsPIC prototype dev board together for mucking about on. I've done such things before, but I've always had a +5V supply available, so when I've needed a 3.3V rail for the dsPIC, I've stuck a regulator on the 5V supply. Which was fine, but that's not the situation this time.
> 
> If I've only got +/-15V available, what's the best way to derive a 3.3V rail?
> 
> 
> I've used 3.3V regulators on the 15V rail before and found they got hot, which wasn't a surprise seeing how much voltage they've got to lose somewhere. But perhaps I was doing something wrong?
> 
> Thanks,
> Tom
> 
> 
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