Which is correct, ψJT or RθJC?

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Which is correct, ψJT or RθJC?

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tokonmei2007
Contributor I

Dear Sirs,

I'm estimating the junction temperature of the iMX6ULL(MCIMX6Y2CVM08AB).

Natural convection occurs without using a heat sink.

The package top temperature is 81 °C , which was measured by a thermocouple wire.

Also, I calculated the power consumption is 1.8W.

Is it okay to calculate the junction temperature using ψJT (not RθJC) as follows?

tokonmei2007_0-1631789594274.png

Tjunction =81°C+2.3°C/W*1.8W

               =85.14°C

 

Thank you.

Best Regards,

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