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DRV8824 Chopping Waveform

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Intellectual 450 points
Other Parts Discussed in Thread: DRV8824, DRV8811

Hi,

I have two questions about chopping waveform for DRV8824.

Q1.  Compare with DRV8811, chopping waveform for DRV8824 seems irregular chopping.  What is the reason?

Below is the waveform for DRV8811.

Below is the waveform for DRV8824.

 

Q2. Compare with DRV8811, chopping waveform for DRV8824 seems low current drop.  What is the reason?

 

Thans in advance.

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  • 0
    TI__Mastermind 26065 points

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    You looked very deeply.

    DRV8811 has a fixed OFF time mix decay while DRV8824 has a fixed PWM frequency mix decay.

    In DRV8824, it is possible to have different current decay profile at each PWM cycle, if the current cann't reach to the setting level at the first PWM cycle. (usually happened when motor inductance is relative big)

    Although seems irregular, but it is regulated to the setting level. It is designed this way. No risk of this difference.

    Thanks,

    Wilson Zuo

  • 0 in reply to Wilson Zuo
    Intellectual 450 points

    Hi Wilson,

    Thanks for the explanation.

    Best Regards,

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