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Old 2nd Dec 2017, 10:57 pm   #44
cmjones01
Nonode
 
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,669
Default Re: Electrolytic capacitor fails after 1 hour in service!

It sounds too me like the capacitor shouldn't have failed, but the way to find out what's going on is to replace with another one the same and see if it fails again. If it does, then either there's something odd about the circuit which is damaging the capacitor, or you've got a bad batch of capacitors. Then you can try one of the same ratings but from a different supplier or manufacturer and see if that helps.

Decoupling a gate driver chip is hardly arduous duty for a big electrolytic like that, and you'd know pretty quickly if its ripple current rating was being exceeded: it would get really, really hot. In the case of ripple current, it's the heat that does the damage. That's why higher voltage rated capacitors tend to have higher ripple current ratings for the same capacitance. They're in bigger cases so they dissipate the heat better.

Chris
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