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Old 30th October, 2001, 07:52 AM
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Question Mosfets Overheating on 8K7A?

I have 4 8K7A's all of which are running 1.2 MP's at around 1450-1500. I'm using 1.9 volts on each board. I noticed those mosfets in the regulator circuit get so hot I literally cannot touch them for more than a second. I'm not talking slightly hot, but more like I'd get burned if I held my finger on the little heatsinks. I'd bet they're around 140-150 degrees F. My cases have plenty of ventilation. I'm wondering if this is typical or do I need to direct a fan onto the board? Seems like at some point they may go into thermal run away and burn up, or are mosfets immune to that?
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Old 30th October, 2001, 08:18 AM
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Hmm, interesting. I need to keep an eye on this thread. Maybe check the temps on the MOSFETs on my 8KHA+ with my MT4 non-contact thermometer too . . . .
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Old 30th October, 2001, 10:19 AM
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Re: Mosfets Overheating on 8K7A?

Quote:
Originally posted by Cole
Seems like at some point they may go into thermal run away and burn up, or are mosfets immune to that?
For a long time people thought that MOSFETs were immune to thermal runaway. They don't suffer the same way standard transistors do, but it is possible. On the other hand, the MOSFETs on your board should be operating in switched mode, not in their linear section.

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Old 30th October, 2001, 11:32 AM
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I would not worry too much about the heat of the Mosfets - they do get very hot indeed, but are able to remain hot for as long as they can remain very cold.

That is as pointed out - they are different animals to transistors indeed and as such fail differently and under different circumstances.
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Old 30th October, 2001, 09:58 PM
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Well thanks for the input. They've been running fine for a couple of months, so I guess they're okay.
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Old 31st October, 2001, 10:22 AM
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I generally figure that as long as the case is below 100C then you're still on the safe side. Over 100C, then you're on the wrong side of too hot.

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