Peter Clifton wrote: > It will still have had its life-time shortened. > > The spec you quote above, AIUI, means that after somewhere between 1000 > and 5000 hours of operation at 105 degrees centigrade, the cap (as > measured at 20 degrees) will be outside of its quoted specifications. > > I can't remember the exact numbers, but derating to lower temperatures > has a stupid factor of lifetime increase. It might even be as much as > double the life-time for every 10 degrees drop in working temperature. > > I guess that merely being at elevated temperature is also lifetime > degrading. You circuit wouldn't need to be on for the electrolyte to be > degrading. > Looking at the data sheet, they claim after being exposed for the test, the device will return to to within +/-20% original value, and the tan-delta will be within 200% original. So the thing gets lossy, I suppose.
Is the endurance a cumulative thing? I've got a requirement of around 3.5 A ripple current (although I really need to double check this in simulation), which is a lot of ripple. I planned to use 2 caps in parallel, each with about 1.8A max ripple. But I'm worried that eventually, the things won't do their job. _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
