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DRV2603: driver is generating weird control signals

Simon Cussonet
Prodigy 20 points
Part Number: DRV2603

Hi,

I'm trying to use a DRV2603 to control a C10-000 LRA from Precision Microdrives (www.precisionmicrodrives.com/.../c10-000-10mm-linear-resonant-actuator-3mm-type) but the vibration is "weak" and the control signals don't look right when compared to the datasheet.

This is the circuit I'm using :

The three DRV_* pins are controlled by a microcontroller and driven to continuous 1. The application seems simple enough and I don't know where I went wrong. The motor manufacturer says this is a driver issue and that they don't know. I've built 3 prototypes, all of them had the problem, so this looks like a design issue.

Do you know where it could come from and how to fix it?

Thanks

S.

  • 0
    TI__Expert 8832 points
    Hi Simon,

    From the graph it looks like the resonance is not locking on properly. When driving the LRA, make sure the LRA is secured to a mass of some sorts. If the LRA is hanging freely, this can cause problems. What is your voltage rail? Can you send an image of your prototype layout?
  • 0 in reply to Kelly Griffin
    Prodigy 20 points
    Hi Kelly,
    Sorry for the delay and thank you for your answer. You were right, I was trying with the motor hanging freely or resting in my hand (like I did with ERM motors), but it needs to be fixed firmly in order to generate correct signals. Unfortunately that makes this technology less suited for my use case.
    Best regards,
    Simon