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TPS82130: Thermal derating curve

Taketo Sato
Genius 10325 points
Part Number: TPS82130

Hello team,

My customer would like to understand back ground of the change of thermal derating curve from Datasheet rev.A to current datasheet revision.

Datasheet rev.A used Psi_JB based information while recent datasheet revision uses theta_JA based information.

Could you please let me know why the change was done?

Psi based information may provide better tracking actual use case?

Best regards,

  • 0
    TI__Genius 17905 points

    Hi Sato-san,

    It is the same power dissipation capability information being shown in the two sets of derating curves. For example, if you look at 12Vin to 3.3Vout curves and readout the temperature at which the output current is limited to 2A, you will see the board temperature (old datasheet) is about 97C and the ambient temperature (new datasheet) is about 75C. You will calculate about 1.08W of power dissipation in the module for this condition whether you use the PsiJB and board temperature or the ThetaJA and ambient temperature values, working backwards from max allowed module temperature of 125C.

    Most, if not all, of our module datasheets show thermal derating curves against ambient temperature, and this change may have been to move to this standard representation of this information.

    I hope this helps,
    Kris