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DRV8837: Dead time of DRV8837

Troyson Li
Expert 2455 points
Part Number: DRV8837
Other Parts Discussed in Thread: DRV8838

Hi team, 

         Does DRV8837 have installed dead-time control in brake mode ?  It seems to cause a short circuit by putting high levels into both IN1 and IN2

         Thank you! 

  • 0
    TI__Guru** 114905 points

    Hi Troyson,

    Dead time is inserted as the device switches from low to high or high to low.

    Can you provide more details?

    Why do you think there is a short circuit condition?
    Do you have any scope captures showing the short circuit (voltages at both outputs plus current)?
    What is your load and how is it configured?

  • 0 in reply to Rick Duncan
    TI__Guru** 114905 points

    Hi Troyson,

    We have not heard from you in some time and are assuming your issue has been resolved.

    If it has not please reply to this thread, or if this thread has been locked select "+Ask a related question" at the top right of the page.

  • 0 in reply to Rick Duncan
    Expert 2455 points

    Hi Rick：

            My ctm is doubt that it doesn't say how dead-time control work in datasheet. They will use brake mode which will face with dead-time control. They need TI can ensure the circuit short will not happen when they use brake mode.

             Thank you !

  • 0 in reply to Troyson Li
    TI__Guru** 114905 points

    Hi Troyson,

    Although the datasheet does not specifically state this, the DRV8837 and DRV8838 have dead time control integrated into the device.

    A handshaking circuit monitors the FETs when switching.

    Once the high side monitor determines the high side FET is off, then the low side can be enabled.

    A similar monitor is on the low side to prevent the high side turning on prematurely.

  • 0 in reply to Rick Duncan
    Expert 2455 points

    Hi Rick：

            I got it. Many Thanks！！