will a std electrolytic survive to this 500KHz switching?

[elnaldo]

Hello.Found a fail in a class D amp, one SMT electrolytic gave up. Fitting a new capacitor fixed the issue , but I wonder if a regular electrolytic cap will last in this application, or what is a better part to use here.

It's C66 in this schematic, part of the triangular wave oscillator, the scope shows a 515KHz switching freq. Capacitor in my unit was 4.7uF 25V, I've fit a 4.7uF 100V standard 85º capacitor.

 

[Binkman]

Amigo.. don't see any issue.. probably better than orig.

 

[elnaldo]

Amigo.. don't see any issue.. probably better than orig.

I was reading a paper from "ELNA" saying not to use electrolytic capacitors in fast "charge-discharge" cycle applications. But I don't know if this applies to this circuit.

 

[Binkman]

if the unit is audio gear I don't think an issue.. orig. smt wasn't up to snuff.. could put a ceramic in. but I see +/-12vdc all over.

 

[elnaldo]

Yes, seems the problem start at 1mHz or higher. I've connected a small ceramic bypass just in case it helps something.