Jimmy wrote:

I want to power my FET amp(200W) from a mobile power supply. Amp requires
50VDC. It occured to me that car stereo amps use DC to DC converters that
would produce the voltages and currents that I need. Would like information
on where I could get parts/information to roll my own. I am particularily
intersted in the transformer design and where I could get one already made.
This doesnt seem to be something one can get easily as a replacement part.



With those power levels you're probably dealing with custom magnetics.
There's a switcher in the '04 handbook with the right power level, I'd
consider basing your magnetics on that, or at least use the stacked
E-core idea.

Barring that you could try to get your hands on someone's surplus car
stereo equipment, and harvest the power supply section from that. You
may also want to shop the surplus suppliers for DC-DC converters. 48V
is a common telco voltage, there ought to be bricks (or combinations of
them) that would step you up from 12V nicely.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com