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TPS40428: Temperature reading has 30C gap

Stan Wu
Intellectual 580 points
Part Number: TPS40428
Other Parts Discussed in Thread: CSD95372BQ5MC,

Hello,

We use TPS40428 + csd95372bq5mc *2 for 2-ph design and we found the temp reading is 63C at no load condition with 25C amb temperature.

By the thermal scanner, the Tc is just 34C at this condition. May I know what causes this wrong reporting? and seems the offset is only +3C / -4C.

How can we resolve this problem? Is it related to 2-ph configuration?

BR.

Stan.

  • 0
    TI__Mastermind 24075 points

    Hi Stan,

    When TPS40428 works with CSD95372B, the temperature readout will be 25c higher than the actual temperature.

    Other than that, these two parts work well together.

    This problem does not exist when TPS40428 works with CSD95378B. That's why we recommend CSD95378B on TPS40428 datasheet.

    If you do want to use CSD95372B, please set OT threshold 25c higher than the actual value you want.

    Thanks

    Qian