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DRV8801-Q1: nSleep and PWM

toshi-e2e
Genius 4705 points
Part Number: DRV8801-Q1
Other Parts Discussed in Thread: DRV8801

Hi all,

The datasheet described that "When switching from low to high, the user should allow a 1-ms delay before applying PWM signals. This time is needed for the chargepump to stabilize."

1. If the phenomenon that the motor does not move occurs without observing this timing, what kind of thing is estimated in the IC?

2. If the above phenomenon occurs, is the SLEEP mode possible by turning the nSLEEP signal low, or is the operation uncertain?

Best regards,
Toshi

  • 0
    TI__Guru** 114905 points
    Hi Toshi-san,

    I am sorry. I do not understand your question. Would you please clarify?

    Until the charge pump is stabilized, the Rdson of the high side FETs will be less than optimal. This can create additional power losses and heat until the charge pump stabilizes.
  • 0 in reply to Rick Duncan
    Genius 4705 points

    H Rick-san,
    thanks for your response.
    Sorry for the lack of explanation.
    I understood your explanation.

    My customer has developed the motor drive board with DRV8801.
    A phenomenon occurred in which the motor of one of the 10 boards did not operate properly after power on.
    They did a reproduction experiment, but since the same thing was not reproduced after that cannot confirm it.
    So I asked the previous question about the possibility.

    I have confirmed some of the phenomena to my customer. I will inform you when there is a reply.

    If you have any question, please let me know.

    Best regards,
    Toshi