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TPS2819: Power Rating @80°C

May
Genius 9880 points
Part Number: TPS2819


Hi Team,

Just want to confirm, in the datasheet (Dissipation Rating Table), the power rating at Ta=80°C is 227mW, but using the derating factor 3.5mW/°C, I always got 245mW. For Ta=70°C, I got the same 280mW. Is there anything that I missed when computing the power rating at 80°C? I used the formula (Tmax-Ta)= Pdmax(Theta) - (DF(Ta-25°C)). The theta I  used is 286°C/W derived by using the power rating @ 25°C. 

Can you confirm the information in the datasheet.

Thank you and looking forward for your kind response.

Regards,

Maynard

  • 0
    TI__Mastermind 23215 points

    Hello,

    Thank you for the interest in the TPS2819. I looked at the table and the calculations you mention for power dissipation at 70 deg C and 80 deg C ambient using the derating factor and see similar results as you mention. I see in the notes that the table results are a result of thermal simulations. I am assuming at higher ambient temperatures the derating factor becomes non linear as you get closer to the maximum recommended junction temperature of 125 deg C.

    I would recommend using the table values if your application is in an 80 deg C ambient.

    Confirm if this addresses your questions, or you can post additional questions on this thread.

    Regards,