SLOA207A November   2014  – November 2021 DRV2603 , DRV2604 , DRV2604L , DRV2605 , DRV2605L , DRV2624 , DRV2625

 

  1.   Trademarks
  2. 1Introduction
  3. 2Actuator Description
    1. 2.1 Eccentric Rotating-Mass (ERM) Actuators
    2. 2.2 Brush-Less Direct Current (BLDC) Actuator Module
    3. 2.3 Linear Resonance Actuators (LRA)
  4. 3Design Considerations
    1. 3.1 Braking
    2. 3.2 Overdrive
    3. 3.3 Headroom
    4. 3.4 Resonance Tracking for LRA
    5. 3.5 Power Consumption
  5. 4Actuator Comparison
  6. 5Revision History

3.4 Resonance Tracking for LRA

As described in Section 2.3, driving an LRA at resonance is extremely important. This can be achieved by manually characterizing the actuator and then generating a signal with fixed frequency in an open-loop configuration. However, since the resonance frequency can shift and also due to part-to-part variations, a closed-loop system that tracks the resonance of the LRA (such as TI's DRV2603, DRV2604, DRV2605, DRV2605L, DRV2624 and DRV2625 devices) is the preferred solution for LRA implementations.