On Mon, Jun 18, 2007 at 10:46:31AM -0700, Steven Michalske wrote: > Putting a LC filter on the output of the bridge rectifier will help > you out.
I looked briefly at LC filters to handle 120Hz ripple. Requires some pretty large, expensive inductors if I'm not mistaken. Seems cheaper in both board space and money to have more capacitance. > Be careful with over sizing switching power supplies, what is the > minimum operating current of your design? My understanding is that with low currents that switcher will enter discontinuous mode (where inductor current goes to zero at the end of each cycle), and this will cause higher output ripple at the switching frequency and more overshoot on the voltage. This is not a big problem in my application. Is there something else that I need to be aware of? I haven't calculated minimum current, but I'm guessing 50mA. (Peak is around 350mA, designing for 1.5A. so that's a big range.) _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user