On Mon, 12 May 2008, 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?
The regulator provided with the metal case that TS sells is a straight
buck reg which seems to be an LM2672 (260khz simple buck switcher), so
that method works fine as long as the frequency is high and the filtering
is sufficient.
If it's really important to you, the TS7260 has onboard buck regulators
and can accept 4.5 to 20v at its power input.
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