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AM3505 power dissipation at different ambient temperatures

Other Parts Discussed in Thread: AM3505

Hi,

We need to calculated the maximum power dissipation at ambient temperatures 80℃ & 85℃.
When calculating "maximum power that AM3505 can dissipate" could we use the
equation mentioned in the Application Report(SLVA462).... PD= (TJMAX-TA)/θJA ?
Where TJMAX for commercial grade is 90℃ and θJA from the datasheet Thermal Resistance Characteristics.

Please let us know if this is the proper way to calculate the Maximum power dissipation
or else if there is any calculation tool.

Best Regards
kummi