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DRV2605: For LPF value of DRV2605

Lee, Sam
Expert 6035 points
Part Number: DRV2605

Hi team,

A customer designed LPF values for DRV2605 as below schematic. Is it okay? Otherwise, can you recommend the proper values?

Thanks,

Sam Lee

  • 0
    TI__Guru* 84915 points

    Hi, Sam,

    It is not recommended to add a filter between the DRV2605 and the LRA/ERM load. The DRV2605 has internal algorithms that calibrate the device based on the load characteristics. If the filter is added it may affect the algorithms results.

    However, if it is used for measurement purposes, the filter seems to be correct. I made some simulations and they generate a 2nd order pass-band filter as shown below.

    It can be used to reduce high-frequency content in the signal measurement.

    I'm also attaching the TINA Spice Design that I used, in case customer wants to make additional simulations.

    2nd_order_filter_design.TSC

    Please let me know if you have questions or comments on this.

    Best regards,
    Luis Fernando Rodríguez S.