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DRV11873: DRV11873 about the Rotating speed question

Mickey Zhang
Genius 12080 points
Part Number: DRV11873
Other Parts Discussed in Thread: DRV10975

Hi team,

The customer is using DRV11873 to drive the color wheel motor on their projector project. 

He needs a constant and stable rotating speed for the color wheel motor. But when he inputs the PWM, the  rotating speed is floating on 120rps.

The attach is the schematic and his PWM waveform. The PWM frequency is 10.02KHZ.

Would you solve this issue?

  • 0
    TI__Genius 12080 points

    Hi team,

    Can anyone support this case? The customer is waiting for my reply.

    Update: If DRV11873 cannot achieve  a constant and stable rotating speed function, would you please recommend a suitable device?

    The customer needs to achieve to control the motor speed accurately.

    Can this function that the customer needs to achieve be  only achieved through the algorithm?

  • 0 in reply to Mickey Zhang
    TI__Expert 3010 points
    Hi Mickey,

    For similar application of color wheel, customer is using DRV10975. DRV10975 has more configuration options compared to DRV11873 and also has sinusoidal commutation which can help here.

    There is not much which can be done with DRV11873, my recommendation is to use DRV10975.

    Regards,
    Krushal