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DRV5055-Q1: sensing voltage level is affected by rotation speed

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Replies: 1

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Part Number: DRV5055-Q1

HI,

We select DRV5055A3 to sense a ring magnet with 2-pole. Two sensor are putted away from 90 degree around the ring magnet. Therefore, we can get sine wave and cosine wave properly.

However, the peak of wave is variable with the rotation speed. Lower Vp-p is appear in higher rotation speed (1000 rpm), and high Vp-p is appear in lower rotation speed (100 rpm).

I do not know how to explain this phenomenon?

thanks.

  • Hello Steven,

    Thank you for using the TI forum. This could be a result of a high capacitance on the device output. For example, if you are using an output filter, such as this one:

    If the capacitor is too large then the voltage may not reach it's max/min at high rotation speeds.  I recommend testing without output capacitance to see if this is the problem, then you can calculate and use a smaller capacitor in the final design if needed/desired.

    Best Regards,

    Mitch M, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

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    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs. All information in this correspondence and in any related correspondence is provided "as is"  and is subject to TI's Important notice and disclaimer.

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