When we started seeing 50 volt caps blowing up on a 5 volt output it became evident that the problem _we_ had, "instant mortality" (grin), was over-current, not over-voltage. We didn't actually see a voltage transient - a 'scope had in fact ruled that out - but someone in management had apparently thought it would be quicker to assume there WAS one.
Cortland Hans Mellberg wrote: >> Nonetheless, inrush current aside, a 20V Tantalum is considered marginal for a 12V circuit if reliability is desired. A 60% derating factor was and is a typical max for reliability circuits, i.e a 30V min rated cap is recommended. Tantalums require additional derating than Al-electrolytics. Furthermore, switchers are notorious for destroying Tantalums due to the large and fast V-swings. I don't recall seeing too many Tantalums on switcher designs. << ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
