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UCC27519: UCC27519 max allowed power dissipation

5t34m
Intellectual 1175 points
Part Number: UCC27519

Hi UCC27519 team,

could you please provide information on the max allowed power dissipation of the device?

There only seems to be a equation in the datasheet but no abs max specificaion.

Thanks,

  • 0
    TI__Genius 12990 points
    Hi 5t34m,

    Thanks for your question! I will try to help answer it.

    As seen from the DS, power dissipation is a function of quiescent current from VDD as well as driver power dissipation during switching. The max power dissipation is based on the PCB and since Tja (the Junction-to-ambient thermal resistance) is highly dependent on the PCB then this thermal reisitance (C/W) is used to calculate max power dissipation (W).

    Thermal absolute max occurs when junction temp is 150C for the UCC2751x. However, the max operating temperature is 140C which allows safe operation. This allows for a temp rise of 115C if the ambient is 25C.

    With a Tja of 217.6 C/W, allows for a 115/217.6 W = .53W max power dissipation.
    Allowing for a 10% tolerance, .47W is a reasonable value for the max power dissipation of this part without raising the junction temperature above 140C.

    Please let me know if you have any further questions.
    Thanks,