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Original question:

UCC28C42: Temperature specification

UCC28C42: Some questions about junction temperature of UCC28C42

Lin_Charles
Expert 4260 points
Part Number: UCC28C42

Hi team,

   My customer is using this device to converter DC 120V to 12V/1A. Their ambient temp is a little high and they want to know if the junction temp is higher than 105C (recommendation Tj claimed in the datasheet) and lower than 150C max Tj claimed in the datasheet). What is the main influence to this device's spec? will our device work normally? Thanks. 

  • 0
    TI__Mastermind 34465 points

    Hello Charles,

    As you say, the parameters in the tables of the data sheet for the UCC28C42 are measured at junction temperature of 105C.
    The device is specified with a maximum working junction temperature of 150C.

    In practice many designs work at 125C without issue.

    There are several curves in the data sheet that show how the characteristic parameters vary over temperature.
    You can see how these values will change up to 125C. 

    You should calculate the operating junction temperature by multiplying the power dissipation of the ic with the thermal resisting from junction to case and adding this to the case temperature.

    The important point is that you do not exceed the 150C limit.

    If you exceed 150C the reliability of the part will quickly decrease.

    Regards

    John