--- In "j.chitte" <> wrote:
>
> Hi,
>
> I am currently running a TS7250 from a ext power supply that uses an
> adjustable buck regulator to drop to 6.5V then a 78 series linear
> reg. to trim to 5V.
>
> The units need to be able to accept a wide range of switch mode DC
> supply voltages and I don't want the regulator ruining the amazingly
> low power drain of the TS boards by consuming 5 times more than the
> board itself.
>
> I'd like to trim the component count and cost by using just a 5V buck
> regulator but I'm a bit wary of startup or some glitch blowing the
> board.
>
> I considered a crowbar and polyfuse but it looks counter productive
> in cost and complexity.
>
> Any suggestions?
>
> Thanks.
>
Some of our systems need to be fed from what is nominally 48VDC but due to
charging of
the batteries, can exceed 60VDC sometimes. I found a DC/DC converter from
V-Infinity,
part no PTK10-Q48-S12 which has an input range from 20 to 72V, with output of
12VDC
at 0.9A. You could probably find one that output the 5VDC you require. It's a
single
encapsulated component, available from Digi-Key and probably other sources.
It's a switched-mode unit, so much more efficient than a linear regulator.
HTH
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