Randall Nortman wrote: > I am dropping anywhere from 20V to 42V (peak) down to 3.3V.
it has occured to me to just accept a bigger 120Hz ripple > and use smaller bulk caps. Sure. That's a good direction to explore. Figure the absolute value you need and keep it above that by knowing how much your current draws are. Let the switcher input see 5 to 42 Volts and its constant inductor current mode will have to exercise some, and you can help it filter out ripple with attention to grounds and guard voltage zones in your layout. Keep all that primary side switching off to one side. John G -- Ecosensory Austin TX _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user