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DRV8718-Q1: DRV8718S-Q1 EVM use problem

Luke Li
Prodigy 130 points
Part Number: DRV8718-Q1

When I use the DRV8718S-Q1 EVM and set the EVM in PWM control mode to drive a motor. When there is a reverse voltage at the output terminal, this voltage will be poured into the SH pin

How to solve this situation?

Why is this happening?

  • 0
    TI__Mastermind 44605 points

    Hi,

    Thank you for your question. 

    Could you share waveform or drawings about your question?  I am not following what you meant "When there is a reverse voltage at the output terminal, this voltage will be poured into the SH pin".

    regards

    Shinya Morita

  • 0 in reply to Shinya Morita
    TI__Prodigy 130 points

    When I use the DRV8718S-Q1 EVM to driving the motor , I set the EVM in PWM control mode to control the high-side MOSFET.PWM's frequency is 20Khz. The phenomenon  occurs when the motor is discharged, and the MOSFET is turned off at this time .

    when the motor is  discharged ,I found that the EVM board's SH pin of  will sink a voltage .

    Do you know the reason for oscillation phenomenon, and is there a solution?

  • 0 in reply to Luke Li
    TI__Mastermind 44605 points

    Hi Luke,

    Thank you for your update.

    In order to understand your issue, could you share your issue waveform?

    What you mean "Discharge motor"? Did you stop motor on the GUI?

    I am guessing one of HBx is PWM driving with motor connection. How did you drive another side of motor?

    Thanks,

    regards

    Shinya Morita