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calc_23.php    6758 Bytes    30-10-2019 18:59:04


ONLINE HEATSINK CALCULATOR


Often copied ... this is the original :-)



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 = 6459 d

t2 = 200 ms

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