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DRV8353: VDS_HA Overcurrent Fault on the A high side MOSFET has existed twice and DRV 8353 has burned

Ticola Nesla
Prodigy 40 points
Part Number: DRV8353

Hello 

I have a problem about using DRV8353. 

While I was driving our motor on approximately 30 Amps, the DRV8353 displayed VDS_HA fault and the motor shut down.

The driving was going on for 5 minutes at 30 Amps. Our Driver Board was overheated. I replaced a new DRV.

I decreased the IDRIVE values from 600 mA to 300 mA and I tried again.  The new DRV8353 has burned out one more time. 

Now, I can drive the motor without phase A high side, but waveforms of all phase are dramatically bad.

We can share several oscilloscope screenshoot. The figures may not be sequent. 

  • 0
    TI__Genius 15186 points

    Hey Ticola,

    Thank you for posting your question to the E2E.

    I will consult with the team and aim to provide response by Thursday next week.

    Best Regards,

    Akshay

  • 0
    TI__Genius 15186 points

    Hello Ticola,

     

    I would like to ask some preliminary question to better understand the issue.

     

    Best Regards,
    Akshay

  • 0 in reply to Akshay Rajeev Menon
    Prodigy 40 points

    Hello Akshay,

    We cannot share the schematic. I calculated the IDRIVE values based on the document that was sent by you. And also Aaron Barrera suggested lower IDRIVE value. 

    Overcurrent method is automatic retry.

    I will prepare relevant pins to be able measured and share with you.

    thanks for help

  • 0 in reply to Akshay Rajeev Menon
    Prodigy 40 points

    Hi again, 

    Firstly, we use DRV 1xPWM mode so INHA pin is used to implement the reference PWM. 

    I have experienced various waveform for INHA, GHA, SHA and nFAULT. The First figure sequence includes running with no error (lower Duty cycle and lower phase current).The other figure sequence include running when fault happen. 

    Motor is running on both situation. However there is much more torque ripple and sound.

    Yellow: INHA (reference PWM signal)

    Green: nFAULT

    Blue: SHA

    Pink: GHA

    All photos was zoomed step by step.

    --------------------------------------------------------------------------------------------

    no error

    -------------------------------------------------------------------------------------------------

    ***********************************************************************************

    -------------------------------------------------------------------------------------------------

    with error

  • 0 in reply to Ticola Nesla
    TI__Genius 15186 points

    Hey Ticola,

    I will consult with the team and aim to provide feedback by early next week.

    Best Regards,

    Akshay

  • 0 in reply to Ticola Nesla
    TI__Genius 15186 points

    Hey Ticola,

     

    From the waveforms it seems like there is some sort of overcurrent being detected which is causing the gate driver output to be shut down. Most likely it might be because the MOSFETS are being switched very fast. The fast switching of the high side gate might lead to dv/dt coupling to the low side MOSFET as seen in the figure below. This can turn on the low side MOSFET and lead to a shoot through condition. Thus, resulting in an overcurrent incident.

    Would you be able to tell us what MOSFET you are using? Then we can find what IDRIVE setting would be the best, since the switching rate is controlled by IDRIVE.

     

    Best Regards,

    Akshay

  • 0 in reply to Akshay Rajeev Menon
    Prodigy 40 points

    Hello Akshay, I can not share mosfet part number. However you can get some specifications below.

    100V

    200A,

    N Single Channel

    3.5mohm Rds-on

    Tr=97ns,   Tf=100ns,     Qgd=45nC.

    Calculated required Idrive = 45nC/97ns = 464mA.

  • +1 in reply to Ticola Nesla
    TI__Genius 15186 points

    Hey Ticola,

     

    We typically recommend our customers to have a 200 ns rise time and a 100 ns fall time for a fast switching.

    Based on a Qgd of 45nC and a rise time of 200ns then we get an IDRIVE of 225mA. Trying lower IDRIVE setting is our recommendation.

     

    It is important to ensure that even with lower IDRIVE setting, we are not coupling the SHx to GLx due to board layout or other concerns. If there coupling then we will cause low side mosfet to conduct and cause a shoot through.

     

    To check if this is happening, we would suggest taking a waveform of GHx, SHx, GLx and nFAULT.

     

    Best Regards,

    Akshay

  • 0 in reply to Akshay Rajeev Menon
    TI__Mastermind 26046 points

    Hi Ticola,

    Do you need any more assistance? If not, please mark as Resolved. 

    Thanks,
    Aaron

  • 0 in reply to Ticola Nesla
    TI__Mastermind 18916 points

    Hi Ticola, 

    Closing thread due to inactivity - Can you let us know if the problem has been resolved? 

    Please let us know if further support is needed on this question. Thanks 

    Best Regards, 
    Andrew 

  • 0 in reply to Andrew Liu
    Prodigy 40 points

    We decreased the IDRIVE parameters. Now there is no problem. However our experiment is going on. If we reach successfully solution, I declare it to you.