On Fri, Jun 15, 2012, at 11:40 PM, gene heskett wrote: > On Friday, June 15, 2012 11:10:42 PM Jon Elson did opine: > > > gene heskett wrote: > > Your idea of triple chipping the driver is an excellent one, but > needs a storage capacitor directly across the chip(s) supply pins, > 2" of pcb trace away won't cut it. Its got to be right there on > those 2 pins, and a capacitor per chip is probably a very good > idea. Electrolytics aren't a great idea either because of ESR > buildup over time, but I saw some 50 volt, 2 u-f dipped mylar > caps not too long ago that might be just what the doctor > ordered.
These days you can get 4.7uF or even 10uF ceramic caps with ultra-low inductance and ESR in a 1206 surface mount package. Mount it right next to (or on the bottom of the board, directly under) the driver chip. Total lead length from driver to cap and back can be a couple tenths of an inch, or less. -- John Kasunich [email protected] ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
