ivp wrote:
> Getting back to my original question, with due consideration, two
> 20A Schottkys could be a substitute for one 40A ultrafast then

There should be no problem speed-wise.  However, you can't just put two
diodes in parallel and add their current ratings.  This is because they
won't share the current equally. The forward voltage drop goes down with
temperature.  That means one of the diodes will take a bit more of the
current, which will make it warmer, which will make it take even more of th=
e
current, which makes it even warmer...

It would be better to find a single Schottky diode rated for 40A.


********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.