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TPS2597: TPS25974L Circuit-Breaker

Shuji Ishiwata
Mastermind 8080 points
Part Number: TPS2597


Tool/software:

Hi All,


I have a question about the TPS25974L.

At startup, overcurrent protection causes VOUT to latch without output.

The current limit is set to 5.7A.
VOUT draws a current of 4.5A from the electronic load.
When VIN is input to the TPS25974L in this state, it latches without starting up.

The waveform is shown below.

The current limit of 5.7A has not been reached, but there is no output from VOUT.
What are the possible causes?


Best Regards,
Ishiwata

  • 0
    Mastermind 8080 points

    Hi All,

    I have been waiting for your reply, but have not heard from you.
    Could you give us a response?

    Best Regards,
    Ishiwata

  • 0 in reply to Shuji Ishiwata
    TI__Mastermind 39295 points

    Hi Ishiwata-san,

    It looks like the power dissipation of about 40W-50W is happening on the device which is causing the thermal shutdown. 

    Can you ask them to test with CR mode or e-load. for 12V power rail, use around 2.5Ohms CR load. 

    Best Regards,
    Arush

  • 0 in reply to Arush Gupta
    Mastermind 8080 points

    Hi Arush-san,


    Thank you for your reply.

    I would like to recommend CR mode and e-Load to my customers.

    By the way, what kind of load is e-Load?

    Also, for latch-type products, if there is a large load at start-up, does it often cause startup failure due to STD?


    Best Regards,
    Ishiwata

  • +1 in reply to Shuji Ishiwata
    TI__Mastermind 39295 points

    Hi Ishiwata-san,

    e-load contains active circuitry and depending on mode selected, it will behave like a resistor (CR mode) or constant current sink (CC mode). Mostly these two modes are used. 

    If the load is high on the output of efuse, we can use somethings to reduce the current during the startup.

    • If load is resistive or continuous in nature. Then we will reduce the startup time by decreasing dvdt cap. Customer should try this also as this will help in CR mode type loads
    • If the load is capacitive in nature i.e. inrush current type. We can slow down the startup to reduce the inrush current by increasing the dvdt cap
    • If load is large and have both inrush and continuous current, then device may not be able to support it. In that case, use PG signal of device to turn on the load after device has turned on fully.

    Please ask them to use lower dvdt cap also if the startup still fails for CR mode.

    Best Regards,

    Arush 

  • 0 in reply to Arush Gupta
    Mastermind 8080 points

    Hi Arush-san,


    Sorry for the late response.

    Customers have reported that it works fine in CR mode.

    Thank you for your support.


    Best Regards,
    Ishiwata

  • 0 in reply to Shuji Ishiwata
    TI__Mastermind 39295 points
    Shuji Ishiwata said:

    Customers have reported that it works fine in CR mode.

    Thank you for your support.

    Happy to help :)