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LM25011 output short behavior

Sean Bigley
Genius 17175 points
Other Parts Discussed in Thread: LM25011

Team,


I have a customer wondering what happens when the LM25011 experiences a short at the output. Does the IC shut down the output all together under this situation? Does it enter a hiccup mode?


Per this thread: https://e2e.ti.com/support/power_management/non-isolated_dcdc/f/196/t/411851 it seems like Chuck Sampson indicated an external hiccup circuit would be necessary for a "hiccup mode" upon output short. Does this mean the IC will simply shut down the output when a short is detected?

Thanks,

Sean

  • 0
    TI__Intellectual 2320 points

    Hello Sean,

    Sorry for the late reply.

    The LM25011 does not enter into any HICCUP mode when shorted and the part does not shutdown. In fact when the LM25011 is shorted the part is inductor valley current limited. So, when the inductor current valley point goes below the valley current limit threshold, the high side FET is turned on but the on-time is reduced by 50% in order to reduce the inductor current ripple. Please see the section 7.3.3 in the datasheet for more details.

    The part continues to stay valley current limited as long the output is shorted. If the customer needs HICCUP mode in this part when shorted, it is not possible with this part internally. Quite a few external components will be necessary if we need to implement a crude form of HICCUP mode with this part, which is not advisable.

    Regards,

    Sourav