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DRV8711: Predriver Fault(XPDF) condtion

Hirotaka Matsumoto
Guru 27555 points
Part Number: DRV8711

Hi all

Would you mind if we ask DRV8711?
We would like to confirm Predriver Fault(XPDF) Indexer mode and PWM mode.

<PWM mode>
In PWM mode, if excessive current is detected on the gate drive outputs (which would be indicative of a failed/shorted output FET or PCB fault),
->Acoording to short between XOUT1(or XOUT2) and GND, we guess that it is possible to confirm.

<Indexer mode>
The datasheet shows "When in indexer mode, both H-bridges are disabled, the xPDF bit in the STATUS register is set, and the FAULTn pin is driven low."
As the condition of occurence, is it the same as PWM mode? short between XOUT1(or XOUT2) and GND??

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Guru** 114905 points
    Hi Matsumoto-san,

    The predriver fault (xPDF) indicates a failure on the gate of the FET. The predriver fault may not catch a short between xOUT1/xOUT2 and GND.
    The OCP fault (xOCP) indicates a failure between the drain and source of the FET. The OCP fault should catch a short between xOUT1/xOUT2 and GND.

    These faults are detected in both PWM and indexer mode.
  • 0 in reply to Rick Duncan
    Guru 27555 points

    Rick san

    Thank you for your reply.
    The predriver fault (xPDF) indicates a failure on the gate of the FET. The predriver fault may not catch a short between xOUT1/xOUT2 and GND.
    The OCP fault (xOCP) indicates a failure between the drain and source of the FET. The OCP fault should catch a short between xOUT1/xOUT2 and GND.
    ->OK, we got your saying.
       Otherwise, could you let us know the method to occurs predriver fault (xPDF) concretely?

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Guru** 114905 points

    Hi Matsumoto-san,

    The predriver fault monitors proper operation of the x1LS/x2LS/x1HS/x2HS outputs of the DRV8711. If incorrect operation is detected the PDF fault is activated.

    Examples of detectable predriver faults are gate to source short, gate to drain short, pin short to adjacent pin.

  • 0 in reply to Rick Duncan
    Guru 27555 points

    Rick san

    Thank you for your reply!
    We will check it with your suggestion.

    Kind regards,

    Hirotaka Matsumoto