Power Output into Temperature

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Power Output into Temperature

Postby Phil57 » Wed Apr 26, 2006 10:13 pm

hokey... this is going to sound very silly, but bare with me.

I have a value for the power dissipated as heat by a Printed Circuit board. Basically, I'd simply like to know how hot the PCB is going to get.

Sounds really simple, and being a mechanical engineering student, this is something that I really should know already.

I know its not a direct converstion, does anyone know the formula I need?

Many thanks.

Postby Guest » Thu Apr 27, 2006 1:40 am

That would be tough. PCBs are pretty good thermal insulators. I think you'd have to analyze each component on the board that had significant heat dissipation (a few could be ruled out by engineering judgement). The whole board would NOT be at the same temperature.

If it were a heat sink, made of aluminum, for example, of the same size, you could make good estimate. You would need the total surface area. Then there are formulas for estimating total thermal resistance to air. You'd need to know whether it was horizontal or vertical, bare aluminum or painted, anodized, etc which changes emissivity.

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