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calc_23.php   6628 Bytes    08-10-2014 09:26:27


ONLINE HEATSINK CALCULATOR




schematics



TRANSISTOR


Tj    °C


Rth,j-a    °C/W


Pdiss    W


THERMAL PAD


 

Rth    °C/W


 

HEATSINK


Ta    °C


Rth    °C/W


 




Tj

Temperature of the junction. Damage level for silicon is 175 °C

Rth,j-a

Thermal resistance of transistor. (Between junction and ambient)

Pdiss

Dissipated Power.

Rth

Thermal resistance of pad/heatsink.

Ta

Ambient temperature. If greater than 60 °C, you should prevent user from touching it.





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t1 = 3876 d

t2 = 808 ms

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