The TL317CD is the SO8 version of a LM317 regulator. Max 40 V and 100 mA, but - I guess it ould run too hot... You don't have room to help this little fellow out do you ?; with a zener in series to the input or soething ? Anyway - just look at the size of a SO8 product. Whatever it contains, it needs thermal assistance with black aluminium somehow in my opinion. Can you fit a cooler on top ? Sven -----Ursprungligt meddelande----- FrŚn: Andy Kunz Till: PICLIST@MITVMA.MIT.EDU Datum: den 14 maj 1999 20:31 €mne: voltage regulator question >Anybody know of a SMT regulator which can handle 45V input, 5V/50mA output? > 40V * 50mA = 2W - an awful lot for a tiny PCB to handle. > >I'm finding very few options in the datasheets. > >PCB size is a premium. Reliability is SUPER important, component >cost/complexity is secondary. > >Ideas? > >Thanks! > >Andy > >================================================================== > Montana Design Tech Support - http://www.montanadesign.com >================================================================== >