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LMR23630: Power Calculation for Junction Temperature

Part Number: LMR23630

Hello all,

I want to ask the simple junction temp calculation, I used device LMR23630-Q1(12 PINS).

http://www.ti.com/lit/ds/symlink/lmr23630-q1.pdf

Vin=12, Vout=5, Iout=3A, Ta=25.5

The junction temp formula is "Tj=Ta+Rjc*power"

Tj=25.5 + 16.3 * Power,  on this calculation, how can I calculate the power?

Thank you