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DRV8718-Q1: Behaviour when negative gate to source bias

Josef Warta
Expert 4310 points
Part Number: DRV8718-Q1
Other Parts Discussed in Thread: DRV8714-Q1

Hello Team, 

customer has a question regarding both DRV8718S and DRV8245 ICs:

Will these devices lose control of the Gate/input signal when exposed to a negative gate to source bias?  This can generally occur if the device has an open circuit (gate/input is near zero volts (commanded OFF) and the source is pulled high via a current source on the output used for open circuit detection, or if the source/output is shorted to battery).  Can ion-migration occur resulting in a Vt shift, which may allow the device to be partially ON when the gate/input is OFF?

Many Thanks 

Josef

  • 0
    TI__Mastermind 45075 points

    Hi Josef,

    Thank you for your question.

    I am guessing your are talking about following case. Current goes to VM through OUTPUT FET's diode. As long as sourcing current is not high, no issue. I guess open load detection is less than 100-200mA, so should be OK. Same in DRV8714-Q1, but current path is external FET's diode. 

    regards

    Shinya Morita