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DRV8320: The chip heats up severely when HIGH SIDE MOS SHORT CIRCUIT

zhipeng hu
Prodigy 30 points
Part Number: DRV8320
Other Parts Discussed in Thread: DRV832X, DRV8300
42V supplies power to 8320H. When DRV8320H simulates a high side MOS short circuit on the upper tube, it triggers the hort circuit protection and 8320H enters nsleep mode. At this time, most of the functions of the driver IC have been disabled, but the actual static current has increased by nearly 50mA. The measured current entering the driver IC from SHX is 17.7mA (connected in series to the SHX circuit using a multimeter). SHA, SHB, and SHC correspond to a total current of 17.7mA × 3 = 53.1mA. However, reading the specification did not find a circuit that can generate this current. If the VM continues to short SHX, the driver IC will heat up to 130 ℃. What is the mechanism behind this phenomenon?
  • 0
    TI__Mastermind 18916 points

    Hi Zhipeng, 

    Thanks for posting to e2e motor drivers forum.

    Our team is currently out of office due to US holidays, and will be returning next week.
    Please anticipate a delayed response to your question - and feel free to share additional details which may be helpful to the analysis in the meantime.

    Best Regards,
    Andrew

  • 0 in reply to Andrew Liu
    TI__Expert 5925 points

    Hi Zhipeng,

    The DRV832x devices have a recommended maximum input of 60V but this is including recommended headroom of +/-20%. This headroom is intended to allow for system voltage increases due to BEMF or braking. We expect that the VM/VDRAIN of the system may increase under braking or similar so likely your 42V could have possibly risen above the 60V recommended limit and caused damage to the driver.

    I recommend reducing the voltage you are supplying or switching to DRV8300 or DRV835x family. Let me know if the problem still persists.

    Regards,

    Yara

  • 0 in reply to Yara Al Shami
    TI__Expert 5925 points

    Hello Zhipeng,

    Have you been able to resolve your issue? If so please press the "This resolved my issue" button to any of the answers.

    If you have any other additional questions please feel free to post another E2E question, other wise I will be closing this thread.

    Regards,

    Yara