[sdiy] Best way to get a +3.3V rail from +15V?
jacobwatters at gmail.com
Thu Mar 7 14:21:26 CET 2013
Hello Tom. I am currently running a dsPIC with a 3.3V regulator that
is powered from a +/-8V rail. It might not be the ideal solution, but
maybe you can alleviate some of the heat problem by distributing it
across two regulators, stepping down first to 8V and then 3.3V.
On Thu, Mar 7, 2013 at 8:07 AM, 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?
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