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DRV8718S-Q1EVM: Excessive starting current of the motor causes a fault

Jingguo Wang
Intellectual 2590 points
Part Number: DRV8718S-Q1EVM

When I set the VDD voltage to a higher value or set a larger duty cycle, the system will report an undervoltage error due to the large starting current of the motor. The normal starting of the motor can only be achieved by starting with reduced voltage. Is there any chip-level solution to this problem?

  • 0
    TI__Guru 55605 points

    Hello!

    A system level solution for this would be to increase the bulk capacitance on the PVDD line to hold up the supply during start-up.

    Additionally, PWM can be used to "soft start" the motor by slowly increasing the PWM duty cycle until the motor starts to move and then go to max. duty cycle.  

    Our integrated devices like the DRV8243/4/5 have internal current limiting that will automatically limit the PWM to the motor to allow for a "built-in" soft start.  

    Regards,

    Ryan