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TPS55340: Power dissipation on Flyback configuration for calculating TJ.

Motoyasu Hattori
Genius 11095 points
Part Number: TPS55340

Hi, 

Could you please advise us how to calculate power dissipation of TPS55340 on the following Flyback configuration?
My customer wants to know power for calculating Tj.

Input : 5V
Output : 9V @ 180mA

Thanks and best regards,
M.HATTORI.