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DRV5053: Asking for the DRV5053 output ripple

Part Number: DRV5053

Hi team,

Cusotmer uses DRV5053 and feedback the following questions.

the Hall sensor output ripple is around 35mV. Do you have an idea to reduce the ripple? or Ripple is from the Hall sensor itself.

BR,

SHH

  • SHH,

    Thanks for the question.  The input referred noise for DRV5053 is shown here:

    This noise is largely temperature dependent.  See the plot for a typical unit here:

    We can calculate the expected noise range for this device based on the package variant you have shown (RA):

    The output noise is expected to be 22 mV peak to peak with the typical sensitivity of -45 mV/mT and typical noise of 0.49 mT peak to peak.  Variations from typical values could result with noise up to 35 mV peak to peak. Keep in mind that at higher operating temperatures this noise will increase. 

    To reduce this noise, they could adjust the filter on the output. Section 8.2.2 of the datasheet provides guidance for designing the filter. I see from the schematic above a filter has already been set to about 16 kHz.  If the customer can afford to set the corner frequency lower, they might be able to improve the noise they are observing.  The example shows various noise measurements for the VA package variant (44 mVpp typical)

    Thanks,

    Scott