Re: Jimmy's DRSSTC 2

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Original poster: "Jimmy Hynes" <JPHynes-at-gmail-dot-com> 

Hey,

 > >pulse rating on these IGBTs is 600A for 1ms, and the datasheet says the
 > >pulse width is limited by junction temperature.

I didn't use that number for my calculations, I looked at the
transient thermal impedance charts on the datasheet. Those make it
look even better than your method.

 > Does the mfr publish a thermal model for the device... Usually, they'll
 > give you a 2 or 3 node model.  Die mass: Theta jc: case mass: theta cs

Yeah, last charts on this pdf
  http://www.ineltron.de/english/mitsubishi-data/IGBT/CM300DY-24H.pdf

 > If you know these masses and thermal resistances, it's just like a cascaded
 > RC network, and you can calculate the time constants.

That's pretty much what I did.