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DRV10866 Standby mode

Other Parts Discussed in Thread: DRV10866

Hi

  Could you tell me how to enter standby mode DRV10866?

   Is it that Input PWM is low? If this is correct, How long should the input signal be made Low?  

Thanks

Shimizu

 

  • Hi Shimizu-san,

    This is listed in the datasheet. If PWM = 0 for typically 500us, the device will enter standby mode.

    From the PWM description in the Pin Functions section:

    ". After the signal at the PWM stays low PWM 10 (up to 500 µs), the device goes into low-power standby mode."
  • Hi Rick-san,

    Thank you for your support.
    I see the following in "7.3.4 Voltage Surge Protection" of D/S page 8.

    "the device goes into standby mode from a high duty cycle,"

    What does this mean?
    Maybe, I think that driver goes into standby mode when FG speed is been over max FG speed from a high duty cycle, too.
    If this is correct, Could you tell me the return time from standby mode.
    I think this is mechanism of the following post "DRV10866 About FG waveform".
    e2e.ti.com/.../1579578

    Thanks
    Shimizu
  • Hi Shimuzu-san,

    Entering standby mode only takes ~500us. The outputs are disabled and the motor begins to coast. If the motor was running at high speed, the voltage clamp acts to maintain a safe voltage at VCC.

    An example is a board with a digital input (no duty cycle). This will produce 100% motor speed or standby.
  • Hi Rick

    Thank you for your support.

    I'm sorry to ask you a question many times.

    >An example is a board with a digital input (no duty cycle).

    >This will produce 100% motor speed or standby.

    Does "no duty cycle" mean "100% On Duty"?

    And Is the cause of the following event (red circle) standby mode by being over speed? or over current?  

    Thanks

    Shimizu

  • Hi Shimizu-san,

    Sorry, I was not clear. There are two PWM signals in the DRV10866.

    Input pin 10 (PWM) can be a logic low, logic high, or a PWM frequency between 15kHz and 50kHz.
    There is an internally generated 156kHz PWM signal used to switch the outputs.

    If the input PWM signal (Pin 10) is:
    a logic low for >500us, the device will enter standby.
    a logic high, the device will attempt to run at full speed.
    a frequency, the device attempt to match the duty cycle at the device outputs using an internally generated 156kHz frequency.

    What is Ch2 in the scope capture? If it is the PWM input what is the frequency?
    A logic high at the PWM input will signal the motor to run at full speed.
  • Hi Rick

    Thank you for your support.

    Ch2 is FG output(FGS setting is "1", pole pairs is "4").
    FG frequency is 752Hz.
    This picture is customer's waveform at occurring "Problem of missing FG signal at high motor speed".
    I think input PWM duty is 95% at this event.
    But a motor normally seems to be operating.
    I think if this event's cause is not "over current" or "standby mode", i guess that cause is internal FG circuit spec over.

    I have a question.
    I think when motor parameter and chopping current setting doesn't match DRV10866, DRV10866 can't operate motor by 100% On duty of input PWM.
    Is this idea correct?

    and I ordered EVM for my suooprt to TI. and I requested cutomer to give user motor.
    I will try on my bench.

    Thanks
    Shimizu