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Linux/TPS659037: tps6590375

dai jack
Prodigy 70 points
Part Number: TPS659037
Other Parts Discussed in Thread: AM5728, TPS659039-Q1

Tool/software: Linux

Use the TPS659037 to power the AM5728, power-on at ambient temperature of 70 degrees Celsius, and the PMIC into thermal protection without any voltage output.
If the normal temperature after power, the environment can be 70 ° C under normal work.
How to design to run at 70 ° C power?

  • 0
    Prodigy 70 points
    The chip's operating range is -40 ° C ~ 85 ° C. At 70 ° C, why power-down and then power-on thermal protection it？
  • 0 in reply to dai jack
    TI__Genius 16410 points

    Hello,

    Did you confirm the shutdown source by reading the SWOFF_STATUS register after the PMIC starts again?  If it is an over-temperature condition causing the PMIC to switch off, the SWOFF_STATUS.TSHUT bit will be set to 1.

    The PMIC's over-temperature protection is based on junction temperature of 133C minimum (148C typical).  If this is really happening, it means you have 133C - 70C = 63C minimum rise of junction temperature over ambient temperature.  Since ThetaJA = 36C/W, it means you would have almost 2W of power dissipation in the PMIC.

    So I would suggest a couple things:

    1. Read the SWOFF_STATUS register after your shutdown to confirm it really is thermal shutdown causing the issue.
    2. Calculate the expected power consumption in the PMIC for your system.  You can use the below tool to help with the calculation.
      TPS659037 Power Estimation Tool.xlsx
    3. If you are getting something close to 2W, if you have an IR camera and measure the case temperature, then use ThetaJC = 6.6C/W to calculate the actual junction temperature.
    4. If you are really having too high temperature, you will likely either need to add a heat spreader or heatsink, or else reduce the power consumption loaded by the PMIC.  Or, see if there is another very hot component next to the PMIC that could be heating it up.  In general, the PMIC can work with AM572x systems at 70C ambient.  So I'm expecting either your power consumption is too high, something else is heating up the PMIC, or you have some other source of power-off that is not over-temperature.

    Regards,
    Karl

  • 0 in reply to Karl Wallinger
    Prodigy 70 points

    Thank you for your answer！

    Since AM5728 is not running, there is no way to read the status value.
    By detecting the current value, you can determine the AM5728 power consumption is greater than 2W in the process of the point.

    Does this problem occur with TPS659039-Q1?
    Is there a reference design for the TPS659039-Q1 and AM5728?

  • 0 in reply to dai jack
    TI__Genius 16410 points
    Hello Dai,

    Just to be clear, I mean 2W internal to the PMIC. The processor can consume more than 2W power. Assuming ~80% efficiency, we can estimate the processor could consume ~10W when the PMIC is consuming 2W.

    TPS659039-Q1 and TPS659037 have the same power resources and package, so I would expect the same power dissipation between the 2 PMICs. There is no reference design available with TPS659039-Q1, only with TPS659037.

    Regards,
    Karl