Re: 250mA voltage clamp

On Sun, 11 Dec 2005 13:40:32 -0800, "Walter Harley"
<walterh@xxxxxxxxxxxxxxxxxxxx> wrote:
>
>And in answer to Jim's question: it takes about 300mA draw for the internal
>impedance of the supply to drop the voltage sufficiently. I'd rather avoid
>a shunt regulator if I can, so as to avoid unnecessary heating. The
>max-load condition is unusual and is expected (though not guaranteed) to
>last only a short time; 99% of the time the load is expected to be only 30mA
>or so.
>

OK, a DC-DC converter, buck/boost type between your source and
load would solve all your problems at 80% efficiency. And be much
easier to implement than some op-amp and pass element scheme.

Jim
.

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