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TPS54295, Recovery from over-current mode...

Bab76
Prodigy 20 points
Other Parts Discussed in Thread: TPS54295, TPS54395

Hi,

I decide to use "TPS54295" in power section of a new design for an industrial application. I designed it according to the application documents and tested it. All things are OK except the over-current mode. In the component's datasheet, it is mentioned that the components return to normal functionality after removing short-circuit (or over-current). However, in my tests, when it goes to over-current protection mode, it doesn't return to normal functionality unless I disconnect and connect its input power again. Would you please help me what should I do (or if it is required, what should I add to my design to solve this problem).

By the way, I guess that I could use "TPS54395" instead of TPS54295, because it uses Hiccup topology and it will be restarted after it goes to over-current protection mode. Is it true? (Because I haven't tested TPS54395 yet).

Thanks,

  • 0
    TI__Guru**** 191445 points

    The current limit is non latching, but under hard short circuit conditions, the output voltage may fall below the UVP level.  Under voltage is a latching fault.  You can unlatch it by toggling EN.  You probably want to consider TPS54395 if this is a concern for you.  As you noted it has hiccup mode and will restart automatically.

  • 0 in reply to JohnTucker
    Prodigy 20 points

    Thanks,

    Yes, it is a concern for me. I cannot toggle EN after each possibly short-circuit or falling output voltage below the UVP level.  So, It seems that I don't have any other alternative unless consider TPS54395 instead of TPS54295.