On Sun, Jan 12, 2014 at 3:31 PM, Spehro Pefhany wrote: > I would guess it will be more than fine given reasonable conditions, but > I'm not going to do the calculations for you. Here's an excellent > app note that will help calculating switching losses. The conduction > losses are just ton/(ton+toff) * I(on) ^2 * Rds(on). Sum the two and > you have the total losses. > > http://www.onsemi.com/pub_link/Collateral/AND9083-D.PDF Ok, that's what I thought too, but I wanted a second gut feeling. I will attempt the math at some point that I've got time. In the meantime, I'll toss a few on the Digikey order I'm currently assembling. I may have figured out a way to stuff the TO-220 part in there. > Remember an SOT-23 FET is not going to be as forgiving as a TO-220 part > if it goes linear, so don't forget the gate pull-down R. Definitely on the list! That fragility is why I'd love to stick with the larger part, but that space savings is incredibly tempting right now. Thank you! Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .