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DRV8106S-Q1EVM: DRV8106S-Q1EVM

Mark Hiller
Prodigy 20 points
Part Number: DRV8106S-Q1EVM

Hi I think my board has failed. I was running the motor with a supply of 20V 20A cutoff. Motor had min load and was running at 1.6A. Wanted to check the function of DRV/OFF and SLEEP. When I turned off by switching using sleep, it worked fine for a couple of times, then ceased to work. Now there is no control of the motor at all. It is always on, with PWM at 0  and INHiz at low. I have disconnected the 0 ohm resistors to these pins for use with external PWM so know these are at zero. GH1 and SH1 are both at PVDD. I cannot reconnect the GUI. Was working fine till I turned on and off via sleep a couple of times. The lights Status PVDD and DVDD are good. n fault comes on briefly on shutdown, was overvolt, but can not see now!

Bothered as by this am planning to use this for a Greenpower F24car (have my own layout with much larger MOSFETS). A full on mode failure is something that I cannot allow to happen ....

Please can you advise

  • 0
    TI__Mastermind 36235 points

    Hi,

    Not sure but your board may be broken. DRV8706 or external FET (or other components) could be damaged. For DRV8706 quick check, you can monitor VCP pin which is charge pump output. If your PVDD is 20V, VCP should be ~30V. Please refer table 7-9 on datasheet for condition of charge pump active. If VCP is not proper voltage, it is obvious that DRV is broken. If DRV is OK, FET could be next one to check.

    You commented about "Overvolt". It could be reason to damage part. DRV can turn off gate driver by detecting overvoltage, however DRV will be damaged if PVDD exceed absolute max voltage. DRV and external FETs are absolute max voltage is 40V.

    regards

    Shinya Morita

  • 0 in reply to Shinya Morita
    Prodigy 20 points

    Hi The Volts were never above 28 so not that, VCP is 29v off the 20v.

    The GUI will not connect. Cannot see why it thinks GH1 should be set full on all the time.

    Is the GUI chip suspect? Does that have a bad failure mode?

    I am more concerned as to why it is set high the whole time without any input......

  • 0 in reply to Mark Hiller
    TI__Mastermind 36235 points

    Hi,

    Thank you for your feedback. So VCP is 29V when you input PVDD=20V.

    If external FET is broken/short, GH1 and SH1 could be PVDD, i guess.

    For GUI chip, not sure.. May try reset button and GUI user manual procedure on 2.4.

    regards

    Shinya Morita

  • 0 in reply to Shinya Morita
    Prodigy 20 points

    Tried that and just about everything I can think of! So the question is how does switching sleep on and off with the motor running blow the unit up? Why is the failure mode leaving the motor running? It seems like the interface is set to send full on when it is not working.

  • 0 in reply to Mark Hiller
    TI__Mastermind 36235 points

    Hi,

    Thank you for your update. Looks like something wrong on GUI(MCU) chip probably. Just switching sleep on and off does not blow the chip, however I understand your EVM does not work now.

    Could you proceed the return/refund process? If you bought from TI Store, you can comment about this E2E/my name why you are requesting the refund.

    https://www.ti.com/support-quality/additional-information/customer-returns.html

    Here is customer support link for in case.

    https://ticsc.service-now.com/csm

    Sorry for inconvenient.

    regards

    Shinya Morita