[sdiy] SSM2164 protection

[Neil Johnson]

Tim,

Oscar Salas <osaiber at yahoo.es> wrote:
>> So, if you have place for the two 1N4002 for reverse polarity protection in your PCBs, you don’t need do anything. Just place two 1N5819 instead the two 1N4002.
>> They will do the job of the 1N4002s (actually better because their much lower forward voltage) meanwhile will protect against negative supply fault for the SSM2164.
>>
>
> So the reverse polarity protection diodes I have on my boards are
> already doing this?

AS LONG AS THEY ARE SCHOTTKY!

Normal 1N4002s or other ordinary silicon diodes have a 0.7V forward
voltage, which won't be enough to protect the 2164.  The Schottky,
being less than half that, does protect the 2164.

Cheers,
Neil
-- 
http://www.njohnson.co.uk