Re: MOSFETS in parallel in switchmode improves effciency?

On a sunny day (Tue, 24 Feb 2009 14:13:02 -0800 (PST)) it happened Klaus
Kragelund <klauskvik@xxxxxxxxxxx> wrote in
<c4022c86-db1e-4d16-96d0-0db5bb5802c6@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

I don't know if its a buck you are playing with, but you could try to
arrange the inductance according to the input voltage range/output
voltage/etc to let it function only in discontinous mode, since
reverse recovery losses of the freewheeling diode is minimized at the
expense of more ripple current

/Klaus

It is a SEPIC.
I found a nice article via a link on the IRF site, that describes some issues with synchronous
rectification using MOSFETS:
http://www.irf.com/pressroom/articles/440BPS0711.pdf

I think I can do the secondary controller for the MOSFET with a PIC 16F690, using its hardware comparator, and doing
the 'hold' delays in the interrupt :-)
LOL

.