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DRV8353RS-EVM: GDF error troubleshooting

Marvn Arcangel
Genius 12605 points
Part Number: DRV8353RS-EVM
Other Parts Discussed in Thread: DRV8353

Hi Team,

Can you help me troubleshoot the customer issue regarding GDF?

The customer use DRV8353Rx-EVM with InstaSPIN_F2802xF_UNIVERSAL to drive a motor but it does not work. The fault LED is always on. 

I asked them to check the Fault status and the results shows problem with the gate drive:

 The customer is feeding the EVM with 48-60V supply and no modification has been done. 

I asked them to provide scope shots for GLB, GHB, GLA, GHA and ENABLE and below is the result:

Scope shots.zip

The enable pin goes high when the fault LED is on. Can you help diagnose the issue?

Thank you.

Regards,

Marvin

  • 0
    Genius 5040 points

    Not enough information for debugging.

    Brian

  • 0
    TI__Mastermind 26826 points

    Hi Marvin,

    Thanks for posting your question on the Motor Drives forum!

    Did they select the "read all registers" button after the fault occurred? Because if there is a GDF reported in the Fault Status 1 register then there should be a fault bit set in the VGS Status 2 register to indicate which MOSFET caused the VGS fault. Could the customer try to read all registers after a fault and see which MOSFET is causing the fault, as well as check to see if the fault always occurs on the same FET?

    Regards,

    Anthony Lodi

  • 0 in reply to Anthony Lodi
    TI__Genius 12605 points

    Hi Anthony,

    The customer found that the mosfet's G terminal and the mosfet's S terminal are short-circuited. They then removed the mosfet and found that even if not mounted on the board, the PADs G and S are still short-circuit. Does this mean that the DRV8353 is defective?

    Regards,

    Marvin

  • 0 in reply to Marvn Arcangel
    Genius 5040 points

    Hi Marvin,

    Marvn Arcangel said:
    They then removed the mosfet and found that even if not mounted on the board, the PADs G and S are still short-circuit. Does this mean that the DRV8353 is defective?

    2 things can cause short from Gate G to Source S on the board with FET removed: the pcb board has a short or the driver chip is damaged and has internal short. Just lift up the driver G pin off the pcb and see if still short, then it is the board fault. If no short then driver is fried.

    Brian

  • 0 in reply to Marvn Arcangel
    TI__Mastermind 26826 points

    Hi Marvin,

    There is a good chance that the gate to source short circuit could be due to damage in the DRV8353. What gate drive strength did the customer use when switching the MOSFETs? It is possible that the customer was using too high of an IDRIVE setting which then resulted in ringing on the gate/source which may have violated the abs max of the pins of the device. I would recommend using the lowest IDRIVE setting for our DRV8353 EVM, since the MOSFETs on the EVM are low Qgd and it doesn't take much gate current to switch the MOSFETs quickly. I would recommend that they swap out the DRV8353 part on the EVM with a new DRV8353 device and try to run the EVM again using the minimum IDRIVE strength.

    Regards,

    Anthony Lodi