"Riad S. Wahby" <rsw@jfet.org> writes:
What you're talking about is a relatively high power design, which means that in addition to worrying about designing the switching supply, you're going to have to sweat the practical details regarding PCB layout, et cetera.
Another thing about switchmode design is that unless it's pretty simple, you're better off outsourcing it (meaning, get a pre-built one). Back when all you needed was a 78S40 and a few capacitors, resistors, and inductors it was simple enough, but nowadays you can get a high-efficiency (90+% rather than ~70%, look for one advertised as efficiency class V), over-voltage, over- current, short-circuit protected power supply module for less than the cost of the parts, it's really not worth doing yourself unless you need something particularly exotic.
Cypherpunks build circuits,
Cypherpunks assemble systems out of existing modules that someone else has spent the time to develop and tune. Peter.