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DRV2605: PWM problem consulting

Timsen
Expert 1660 points
Part Number: DRV2605


Dear all：

         Ask the following questions

1) PWM input, how to convert into the driving intensity of the motor, the working principle is?

2) PWM requirements, such as voltage, frequency?Does it have anything to do with the resonance frequency of the motor?

Please help to solve

Thank you！

  • Ask the following questions

  • 0
    TI__Guru* 84915 points

    Hi,

    The PWM input is used in order to control the frequency and amplitude of the LRA and ERM actuator respectively.

    In open-loop operation and for LRA loads, the DRV2605 observes the PWM signal and commutates the output drive signal at the PWM frequency divided by 128 (the host should drive the PWM frequency at 128 times the desired operating frequency). The actuator voltage is determined by the rated voltage and overdrive voltage as explained in sections 7.5.2.1 and 7.5.2.2 ( http://www.ti.com/lit/ds/symlink/drv2605.pdf#page=22 ).

    In case of the closed-loop mode, the PWM input doesn't have any effect on the frequency since it is automatically tracked by the auto-resonance algorithm.

    In case of the ERM load, the output voltage is determined by the duty cycle of the provided PWM signal. OD_CLAMP[7:0] sets the full-scale voltage as mentioned in section 7.5.2.1 (Rated Voltage Programming). This applies for both open loop and closed loop modes.

    The PWM input frequency should be used between 10 KHz and 250 KHz.

    I hope this helps you. Please let me know if you have additional questions or comments on this.

    Best regards,
    Luis Fernando Rodríguez S.