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DRV8343-Q1: Failure Modes in Independent PWM Mode

Shinichi Yokota
Genius 9715 points
Part Number: DRV8343-Q1

Hello,

I'd like to ask how DRV8343-Q1 will behave when a failure happens in independent PWM mode.

  • Case 1: Only a certain phase of DRV8343-Q1 fails to operate when an external MOSFET of that phase damages and SHT_BAT, SHT_GND, OCP, or GDF occurs.
    • Can the other phases of the DRV8343-Q1 continue to operate?
  • Case 2: Only a certain phase of DRV8343-Q1 damages, such pin as VDRAIN, GHx, SHx, DLx, GLx, SLx, or SOx, due to EOS (Electrical Overstress) and so forth.
    • Can the other phases of the DRV8343-Q1 continue to operate? In other words, can it affect the other phases' operation?

Best regards,
Shinichi Yokota

  • +1
    TI__Mastermind 26046 points

    Hi Yokota-san,

    For Case 1:

    • In independent MOSFET mode, whenever a SHT_BAT, SHT_GND, OCP, or GDF bit occurs, it will shut off the corresponding MOSFET and set that bit high in the status register for that phase. The other phases of DRV8343-Q1 can continue to operate

    For Case 2:

    • When EOS happens, this can cause internal damage to important regulators such as VCP or VGLS, and this can affect other phases' operations. If a device fails to EOS, it is likely due to large IDRIVE settings causing ringing at the drain, gate, or source pins of the driver. DRV8343-Q1 allows for independent configuration of GHx and GLx IDRIVE source and sink currents, which is a special feature of this driver only, so it is recommended to set these values and evaluate accordingly to prevent EOS at the driver and MOSFET level. 

    Thanks,
    Aaron