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TPS2640: TPS26400PWPR Absolute Maximum Current through IN-OUT pins

Chester N.
Prodigy 140 points
Part Number: TPS2640

Tool/software:

Hi,

We are currently working on the evaluation of a 30W, multi-output PSU design wherein the 24V rail is using TPS26400 that is configured as electronic circuit breaker with auto-retry (MODE pin open) as overload fault response. Under the table about absolute maximum ratings on the datasheet, there is no mention of the maximum current flowing through IN-OUT pins. Can you help provide this particular detail for this e-fuse?

I'm asking this because in our application, we can observe more than 3A peak current passing through IN-OUT pins whenever a short circuit is applied on the output before the channel trips. We would like to verify if this amount of peak current is still safe for the IC in terms of reliability.

Thanks,
Chester N.

  • 0
    TI__Mastermind 32761 points

    Hello Chester,

    What's the 3A current pulse width? What's the ICB set?

    This should be fine since it's lower than the fast trip threshold. During fast trip threshold device will shut down instantaneously.

    Thanks 

    Amrit 

  • 0 in reply to Amrit Jit
    Prodigy 140 points

    We weren't able to capture the waveform in smaller time/div but it should be less than 100us.

    We are using 16KOhm for Rilim so, using equation 4 on the datasheet, Icb is 0.78A.

    Since 5.36KOhm is the min. recommended value for Rilim, Ifasttrip = (1.87)(2.35A) + 0.015 = 4.41A. Does that mean we should consider the Ifastrip threshold of 4.41A as the absolute maximum current through IN-OUT pins?

  • +1 in reply to Chester N.
    TI__Mastermind 32761 points

    Hello Chester,

    If it's below 100uSec, 3A transient current peak is fine. 

    Thanks

    Amrit