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DRV8873-Q1: PWM Control

Sungkon Jin
Prodigy 130 points
Part Number: DRV8873-Q1

Hi,

My design uses the DRV8873-Q1 (SPI Interface).

I am using the PWM control method to control the speed of the motor.

By changing IN2 input to High or Low while IN1 input = Low

PWM control is performed. In this case, motor rotation stops when the duty of IN2 is about 50%.

I want to drive the motor with lower duty.

Ask for help.

  • 0
    TI__Guru** 114905 points
    Hi Sungkon,

    Please refer to Table 5 of the datasheet.

    PWM'ing between OUT1=L, OUT2=H (Drive) and Hi-Z (Coast) may not provide enough current to move the motor below 50%.

    The alternative is to PMW between OUT1=L, OUT2=H (Drive) and OUT1=L, OUT2=L (Brake). This provides more current to the motor.

    Please try PWM'ing using Drive/Brake.
  • 0 in reply to Rick Duncan
    Prodigy 130 points

    Hi, Rick

    By slowing the speed of the motor by lowering the PWM duty
    Thermal fault occurs and motor stops.
    The heat dissipation structure uses the PCB ground plane.
    I would appreciate your advice on what kind of additional improvement should be applied.
    Thank you.

  • 0 in reply to Rick Duncan
    Prodigy 130 points
    Hi, Rick

    By slowing the speed of the motor by lowering the PWM duty
    Thermal fault occurs and motor stops.
    The heat dissipation structure uses the PCB ground plane.
    I would appreciate your advice on what kind of additional improvement should be applied.
    Thank you.
  • 0 in reply to Sungkon Jin
    Prodigy 130 points
    Hi, Rick

    When replacing the DRV8873H-Q1 IC with the DRV8873S-Q1,
    the thermal pad on the bottom of the IC was not soldered properly,
    and the heat was not radiated through the PCB.
    My issue is resolved.
    Thank you very much.