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Dear support team,
acc. the datasheet of the TPS562203 several thermal metrics are listed.
Now i want to determine the max. allowed ambient temperature of the following use case:
Vin=12V, Vout=3.3V, Iout=2A
Acc. datasheet the efficiency of this operating point is approx. 90%.
Output power is 3.3V*2A=6.6W ... 90% efficiency results in 7.33W input power and therfore 0.73W power dissipation on the TPS562203.
What is you suggestion to determine the max. allowed ambient temperature.
Hi Markus,
As you can see from thermal information, Rthetaja_effective which is junction to ambient thermal resistance on EVM board is 73C/W.
Here 0.73W power loss which you calculated from datasheet efficiency results not only includes the die loss but also other loss especially including inductor loss.
I would suggest you can use Webench simulation tool to get IC Tj curve. (The results are based on Rthetaja_effective of EVM board). The ƟJA varies with the different PCB layers, layout and FR4 materials. Note that EVM board is 2 layer and both 2oz for top and bottom.
BRs
Lucia
