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How can I measure my VCM resonant frequency so that I can properly configure the DRV201?

Jon Isom
Prodigy 10 points
Other Parts Discussed in Thread: DRV201

 

What test equipment and procedures does TI use when measuring VCM resonant frequencies?

What are the consequences of configuring the incorrect natural frequency in the DRV201 registers?

Thank you.

  • 0
    TI__Guru 55615 points

    Jon,

    We don't currently have the capability to measure the resonant frequency of a VCM module.  This is usually provided by the manufacturer of the module.

    If you plug in the wrong resonant frequency, the internal ringing compensation circuitry will simply not function correctly and the resonance will not be properly damped.  If you are close enough (within 30% tolerance for 2/fvcm mode and 10% tolerance for 1/fvcm mode), then you will see a proper damped response when making current steps. 

    EVMs are available online at the link below if you would like to experiment with the different modes of the device.

    http://www.ti.com/tool/drv201evm