> One question:  Is it feasable to build an SMPS that will accept an input
> voltage ranging from 9 to >50V yet still provide regulated 5V output?
>

Sure is.

Take a look at the LM2576HV from national semiconductor. It's way big for
your application (3A capable) but it can produce 5v from a 8v to 60v input,
and has efficiancy in the %80 range.

-Denny

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