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TMS320F28379D: ADC PPB limit detection vs. comparator subsystems

Howard Zou
Genius 12365 points

Part Number: TMS320F28379D

Hi, I suppose that for over current detection, comparator subsystems should be used to Hi-Z all the pwms because it's faster than PPB limit detection (which needs conversion and cost time).

But I also find the sentence in reference manual "This functionality also enables safety conscious applications to trip the ePWM based on an out-of-range ADC conversion without any CPU intervention." What's safety conscious applications? It's different from what I mentioned above for over current detection?

  • 0
    TI__Guru 60865 points
    Hi Howard,

    You can use the Comparators and/or the PPBs to achieve similar results.

    The comparators will definitely be faster, but the ADC PPB levels will be much more accurate. The PPBs are also sampled at a specific time in the ePWM control cycle, whereas the comparators are active all the time (although I think you can add a blanking window in the ePMW if desired).

    You can use both to achieve redundant tripps of the ePWM.