[SI-LIST] Re: Capacitor surge current
- From: Christopher Jakubiec <Christopher.Jakubiec@xxxxxxx>
- To: hmurray@xxxxxxxxxxxxxxx
- Date: Thu, 11 Mar 2004 11:21:30 -0800
Hal,
I presented this same question to the ceramic capacitor Engineers at AVX,
and basically what they told me is that it has to do with the energy capacity
of the capacitor.
The following 2 equations are what need to be examined with regards to the
capacitor handling currents:
Energy capacity of the capacitor is E = 0.5CV^2
Enercy content of the current wave is E = 0.2VIT
Thanks,
Chris Jakubiec
Sun Microsystems
Hal Murray wrote:
>
> Suppose I was trying to design a good/safe circuit using large ceramic caps.
> Is there anything in the data sheet that tells me how much current they can
> take?
>
> Most data sheets for electrolytic caps have ripple current specs. I don't
> remember seeing anything like that for ceramic caps. I just scanned a few
> data sheets that I had handy. I didn't see anything, but maybe other data
> sheets are better.
>
> What sort of low duty cycle peak currents are reasonable? The particular
> case that started this discussion seems to be due to a turn-on surge. I'm
> surprised that an occasional event like that would harm a capacitor. How
> would I calculate a safe rise time? Or is that even the right question?
>
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