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Old 8th December 2012, 09:38 PM   #11
evanc is offline evanc  United States
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DUG, I'm using BUZ901 and 906 mosfets. Looking at the derating chart I am well below the line. intuitively the devices felt hot. I wanted to know if I need to adjust my frame of reference of how hot is reasonable.
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Old 8th December 2012, 10:05 PM   #12
glennb is offline glennb  Australia
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Quote:
Originally Posted by DUG View Post
General rule of thumb...
Actually rule of finger:
If you can't keep your finger on it, it is too hot.
I use that rule too. One of my Digitial Multi Meters has a K-Type Thermocouple input for measuring temperature. Buying a Thermocouple probe (~ $15) was one of the best investments I've ever made.

Things heat up above ambient temperature, so if you live in a hot climate you will need bigger heatsinks, or air conditioning !

I would be very wary of operating anything above a case temperature of 60 - 70 deg.C. Reliability goes down and it affects nearby components.
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Old 10th December 2012, 03:52 PM   #13
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Sometimes you just needs loads of heatsinking.
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