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TPS2596: Overtemperature Protection

Eliyahu O
Prodigy 40 points
Part Number: TPS2596

Tool/software:

Hi,

In my design, I use TPS259631. If a short circuit happens at the device's output, the overtemperature protection activates. How long can the device remain in this protected state? Will it continue functioning in steady state (for example, for a week or two)? I couldn't find any information about it in the data sheet.

  • 0
    TI__Mastermind 38785 points

    Hi Eliyahu,

    If I am understanding your question correctly, you want to know for how long system can have output short.

    When output short happens, device will go into fast trip and then will perform current limit startup and then Over temperature protection activates. Device will perform auto-retry so it will keep on cycling between current limit startup, OTP and cool down. If the average junction temperature is not exceeding the abs max temperature, then there is no issue even if this goes on for weeks. If the average junction temp exceeds the abs max temperature, then the reliability will get affected.

    If you use latch off variant, then there will be no retries but then system will have to enable cycle or power cycle to start it again.

    Best Regards,
    Arush

  • 0 in reply to Arush Gupta
    Prodigy 40 points

    Hi Arush,

    Thanks for your response.

    Looking into the data sheet, there is no specified value for the abs maximum temperature:

    How can I ensure the average junction temperature does not exceed the absolute maximum temperature?

    I'm using the Auto-Retry variant.

  • 0 in reply to Eliyahu O
    TI__Mastermind 38785 points

    Hi Eliyahu,

    Can you please tell me your end application and the use case which can cause this scenario. Also is there any specific reason for using auto-retry variant. I am asking this so that I can provide this feedback to wider team for better future device specs.

    We have a similar device (TPS25961) which only performs 3 auto-retry in case of short circuit but that is in WSON package and have bad current limit accuracy compared to TPS2596. Will this work for you?

    Best Regards,
    Arush 

  • 0 in reply to Arush Gupta
    TI__Mastermind 38785 points

    Also, we have max recommended junction temperature of 125C.

  • 0 in reply to Arush Gupta
    Prodigy 40 points

    Hi Arush,

    The output of the TPS2596 goes to an external connector of an electrical unit that I don't control. If a short circuit occurs, a notification will be sent, but there is time before someone disconnects the connector and stops the short. I want to ensure that the IC is not damaged, and more importantly, that it does not compromise the input voltage (power supply).

    The option you suggested won't work for me, I need a package with PowerPAD and good accuracy.

    About the 125 °C junction temperature, the data sheet mentions that the over temperature protection will start working only at 157 °C:

    Does that mean that in case of a short circuit the IC will damage?

  • +1 in reply to Eliyahu O
    TI__Mastermind 38785 points

    Hi Eliyahu,

    The IC won't get damaged. My earlier concerns were that average temperature can remain higher than recommended max. I had further discussion with the design team. 

    I realized that I missed an important point here. The retry delay timer when designing this part was selected such that the average temperature when we have this continuous retries happen will be lower than the recommended max temperature. This retry timer delay will allow the device to cool down significantly.

    So no concerns with this application (even with auto-retry variant).

    Best Regards,
    Arush