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Re: Terry's DRSSTC - All Ready!! - MMC rating

Original poster: "Mark Broker" <mbroker@xxxxxxxxxxxxxxxx>


What is it about your configuration that allows them to tolerate a higher current than the rating you measured a couple years ago? Frequency?

Mark Broker !
Chief Engineer, The Geek Group

Just a question.  Why are you sealing up the MMC?  MMCs get
particularly warm in DRSSTC use actually.  Then again, i probably use
2-3X the current that you plan to ;-).

Good luck ;-)

Steve W.

I just want them in a good solid case that can be banged around in the trunk of the car. The case is NOT air tight. The glue flowed a bit nicer than expected, but the end holes are not sealed. Don't want water to get in it either.

The maximum RMS current they can see in the present configuration is 19.4
amps as opposed to their 13.5 rating.  That gives a temp rise of

  (19.4 / 13.5)^2 x 10 = 21C

A little toasty, but that is for full sustained 300BPS and 500uS pulse
width.  Assuming I will be running less than that for not too long of
times, it will be fine.