On Tue, 21 May 2013, Jon Elson wrote:
> Date: Tue, 21 May 2013 12:07:44 -0500
> From: Jon Elson <[email protected]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] Superglue, or Loc-tite for that motors flywheel?
>
> Peter C. Wallace wrote:
>>
>> PS: we blew a couple 75A 1200V Darlintons trying to make a constant
>> current dynanometer load, so the lesson about secondary breakdown (or FBSOA)
>> kinda sticks with me :-)
>>
> I had a fantastic chat with an IR engineer about the characteristics of
> IGBTs.
> He said to never let them operate in the linear region, even for sub-us
> periods. The positive temp coefficient of the basic element in the linear
> region will cause current hogging to the center of the die, and so
> just the center elements will be conducting all the current until full
> saturation occurs. This will destroy the device very quickly, sometimes
> within a few microseconds!
>
> Jon
>
>
Interestingly SiC BJTs seem relatively immune to secondary breakdown
(positive temperature coefficient of resistivity vs Si's negative)
This also means they parallel well.
Peter Wallace
Mesa Electronics
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