In the TIDA-010054 design guide, on section 22.214.171.124 Thermal Considerations the heat estimation is showed as:
What was the tool used for the Simulation?
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As stated in the design guide, the simulation was performed with "worse-than-calculated" thermal sim tool. Personally, I haven't used that tool. I need to check with the original designer. Meanwhile, I have PLECS, which incl. thermal sim for power switches.