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Convert Watts to Temp 'C'

Convert Watts to Temp 'C'

Convert Watts to Temp 'C'

(OP)
Hello,

How would I go about converting Watts (heat dissapation for a device) to a temp in celsius?

Thanks,
KENCO

RE: Convert Watts to Temp 'C'

T = Ta + Rt * P ; where T = resulting temp; Ta= ambient T;
Rt = thermal resistance in C/Watt and P = power dissipated.

<nbucska@pcperipherals.com>

RE: Convert Watts to Temp 'C'

(OP)
THANKS!!

RE: Convert Watts to Temp 'C'

Finding "Rt" is the hard part.  Rt is not just the conductive resistance inside the heat source (theta j-c for chip packages), it's the resistance from the heat source to the ambient air (theta j-a).

Theta j-a includes conduction, convection, and radiation and can vary dramatically depending on nearby components, airflow, surface area, PCB copper, finish, etc, etc.  

JEDEC has a standardized test that defines these variables -- very useful for comparing chip packages, but useless for predicting results in your system.

ko  (www.ecooling.biz)

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