• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 792 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV110: Solenoid Ringing

Paul Brunette
Prodigy 10 points
Part Number: DRV110

I am using the DRV110APWR to drive 300mA through a solenoid in its "hold" state. I am the part with the typical configuration with the following values: Rpeak = 100k, Rhold = 66.5k, Ckeep = 22uF, Rosc = 160k, Rsense = 0.27. The solenoid is ringing/whining audibly in this configuration. To reduce the whine, I attached a decade box to Rosc and tried some values. The values that resulted in the least audible noise were actually between 50k and 70k, as this configuration results in an oscillation frequency of roughly 60khz. These values are out of the specified acceptable range of 160k to 2M, but the chip and the solenoid still behave as expected.

Is there any information available on the impact of increasing the oscillation frequency of the DRV110 past 25khz?

Are there other reliable options for reducing solenoid ringing?

  • 0
    TI__Expert 4940 points

    Hi Paul,

    PWM frequencies greater than 27kHz may cause start up issue, please avoid.

    The main reason for audible noise is duty cycle > 100% generating a low frequency component. This happens when solenoid current slew rate( di/dt ) is slow.

    Solenoid current needs to be increased to make this current faster.

    Regards,

    Costin