--- Bob J wrote: > On Tue, 11 Jan 2005 13:19:19 -0800 (PST), Stephen R Phillips > wrote: > > > selection as well. They have as an example circuit for the LTC3782 > a > > 12V to 50V 4A boost converter. This is in the range of power you > are > > interested in no? > > Actually the range I need is greater. Minimum 6A, 10A nominal. > There > is nothing off the shelf I've found that can work with my power > requirements, unless I could work with a switcher where that supports > chaining bypass mosfet's. I'm beginning to think I could roll one > together with a with a pic and a couple of mosfet drivers, some > n-channel mosfets (of course with the normal littany of discrete > parts > in the mix). The only 28V commercially-available boost converter I'm > aware of costs about $500. I figure I can do it for much less... > > Regards, > Bob Did you look at the URL and information I pointed too? Did you look at the application information provided on the data sheet? Your peak input current is 29A with 11.5V lowest voltage input if you drop it too 11V it because 30.5A. You can use Fairchild Semis FDI3652 Fets for that application 100V 61A 0.016 on resistance. etc etc. Just go through the numbers. It won't take 5 minutes, more like an hour or two. Remember there examples are just that examples not something to necessarily decide weather it will work for your application or not. Look at page 16 I assume that's what you want to make? Stephen Stephen __________________________________ Do you Yahoo!? Yahoo! Mail - Easier than ever with enhanced search. Learn more. http://info.mail.yahoo.com/mail_250 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist