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DP83822I: Case temperature

Takashi Yamaguchi
Genius 13300 points
Part Number: DP83822I

Hi team,

My customer is considering to use the DP83822I. Could you advise me to the question below?

I am measuring the temperature at the top surface of the IC package (let's say Tc_top). I am thinking that Ta=85°C when Tj=135°C (Operating junction temperature).
What would be the Tc_top in that case?

(T.Y) I think that the customer can calcurate the Tc_top by following equation. 

Tj=Tc_top + psi_jt x Pd 

Tc_top = Tj - psi_jt x Pd = 135degC - 0.9xPd  (at Ta=85deg) 

Is my understanding correct? If you have any test data or simulation data, could you share with me?

Regards,

Yamaguchi

  • 0
    TI__Expert 5425 points

    Hi Yamaguichi-san,

    The formula for the temperature at the top surface for the IC package is as follows:

    Tc_top = Tj - (R_thetaJC x Power), where R_theatJC is the junction-to-case (top) thermal resistance spec.

    To get Tj from Ta (ambient temperature):

    Tj = Ta + (R_thetaJA x Power), where R_thetaJA is the junction-to-ambient thermal resistance spec.

    Below is a link to an app note about the temperature specifications:

    https://www.ti.com/lit/an/spra953c/spra953c.pdf

    Regards,

    Adrian Kam