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Original question:

TPS54620: 9A inrush current

TPS54620: Source / Sink current rating

Dice-K
Mastermind 6330 points
Part Number: TPS54620

Hi support team,

At startup, an output inrush current of 9.3A occurs and the current limit is activated.
We will use TPS54620 knowing that the current limit will work.
Therefore, please check the following.

In the table of "6.1 Absolute Maximum Ratings" in the data sheet, the MAX value of PH / PVIN is "Current Limit".
We use it on the assumption that it will be current limited.
I would like you to confirm that there is no problem with the attached waveform.
Is there a problem with the energy of I2t for the built-in FET?

TPS54620_Current_Absolute_Maximum_Ratings_confirm.pdf

Regards,
Dice-K

  • 0
    TI__Mastermind 18370 points

    Hello Dice-K,

    The device has both current limit protection and over temperature protection.
    So, I would expect it to self protect.

    Have you had any issues? Or observed any failures? Please advise.

    If you want to be more conservative with your approach, you can change the soft start cap to increase the soft start time and reduce the inrush current.
    Hope this helps.

    Regards,

    Yitzhak Bolurian

  • 0 in reply to Yitzhak Bolurian
    Mastermind 6330 points

    Hi Yitzhak,
    Thank you for your reply.

    My customer doesn't want to lengthen the soft start time for the convenience of other devices.
    He also knows that when the current limit is activated, it will take a long time to start.

    Does the current limit being activated at each startup affect the product life?
    If you have any other problems, please let me know.
    This method cannot be used if the FET overheats and causes a thermal shutdown.

    Best regards,
    Dice-K

  • 0 in reply to Dice-K
    TI__Mastermind 18370 points

    Hi,

    This is not the way the device is intended to start.
    But I am not aware of any issues.
    Sorry that I can not be more specific.

    Regards,

    Yitzhak

  • 0 in reply to Yitzhak Bolurian
    Mastermind 6330 points

    Hi Yitzhak,
    Thank you for your reply.

    "Is there a problem with the energy of I2t for the built-in FET?"

    I think the answer to the above question is below.

    "The device has both current limit protection and over temperature protection.
    So, I would expect it to self protect."

    Therefore, I would like to confirm one point just in case.

    Is the current rating (Current-Limit set value) less than the breakdown power?

    The purpose is to confirm that there are no problems with device destruction or life.

    And I'm sorry many times.

    Best regards,
    Dice-K

  • +1 in reply to Dice-K
    TI__Mastermind 18370 points

    Hi Dice-K,


    As I have previously mentioned, this is not the way the device is intended to start.
    Therefore there are no extensive tests or studies done to qualify the device for this specific use case.


    The device has both current limit protection and over temperature protection.
    So, I would expect it to self protect.
    Sorry that I can not be more specific.

    Regards,

    Yitzhak