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DRV8870: Short circuit protection

Umberto Frangi
Expert 4045 points
Part Number: DRV8870

Hi,

 in medical application customers need any kind of protection and not always it is easy to find the right solution.

For example, I was asked to suggest something to avoid that due to simultaneous internal short circuit of the high side and low side of different legs , the motor runs without control.

For your info now they have some relais, more than one, to protect this situation, even if this solution is not 100% sure, because it may happen that also all relays get shorted simultaneously, but in this case probability it may happen is quite low.

Maybe this is a question for QA people, but what is the probability that 2 internal mosfets get shorted.

Any idea or solution?
Thanks

Umberto

  • 0
    TI__Guru** 114905 points
    Hi Umberto,

    Probability is quite low for the FETs failing with a high side on and the opposite low side on.

    For possible solutions, additional protection circuit can be considered. One option is using a external current monitor like the INA19x series. This monitor can then be used to disable a transistor in the current path.