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ClassD amplifer output cannot be used as Audio-to-Haptics input to DRV2605/L

Peter Li79
Expert 8940 points
Other Parts Discussed in Thread: DRV2605, DRV201, DRV2605L

Background : Class-D output is mostly used to drive the speaker, and emission audio signals. DRV2605/L has the capability of acting as transformer from audio to haptics. someone may wonder whether the Class D output can be used as audio source to Audio-to-Haptics of DRV2605/L.

Answer : NO.

Reason : We will need a low-pass filter to filter the class D output signal. And Class-D are also power amplifers, so it will try to drive the filter and burn a lot of energy in the process.

  • Expert 2020 points

    Hi

    regarding your post.

    1. can drv201 be used as haptic driver?

    2. can I genetare a 5-15Hz sinus signal using DRV2605/L? 

    3. what is the max current  DRV2605/L can flow?

    thanks in advanced. 

  • in reply to or sam
    TI__Expert 8940 points

    Hi, Sam:

    Q1:

    No. Please check actuators (used for tactile feedback) specifications.

     

    Q2:

    No. DRV2605/L frequency range : 50 Hz ~ 300 Hz

     

    Q3:

    DRV2605/L has over-current protection. The Load impedance threshold for over-current detection is typically 4 Ohm.

    So, the maximum current is ~VDDmax / 4.

    DRV2605: 5.5V / 4 = 1.375A

    DRV2605L : 5.2V/4 = 1.3A

     

  • in reply to Peter Li79
    Expert 2020 points

    Hi thanks

    for your answer.

    regarding q2 when you say 50hz-300hz do you mean in the library configurations?

    cant I work with it manually - change the voltage (RatedVoltage reg) every few ms via I2C , or even generate via my controller a 10 hz analog sin wave and connect it directly to the drv2605L audio input?

    one more thing:

    q4. what will happan if i connect 100 ohm - 600uH motor to the drv2605L  will it generate 5.5/(100+4)=50mA?

    will it work?

    thanks in advanced,

     

  • in reply to or sam
    TI__Expert 8940 points

    Hi, Sam:

    DRV2605/L support LRA with resonance frequency from 50Hz to 300Hz.

    The chip isn't designed to that way. the RatedVoltage is supposed to be set at the very beginning and keep unchanged during operaton.

    For Audio-to-Haptics of DRV2605/L, the output frequency is unrelevant to the input frequency.

    For your last question, I think it depends on the actuator spec. DRV2605/L can drive the actuator with its rated voltage.

  • in reply to Peter Li79
    Expert 2020 points

    thank you very much for your answers it helped me alot.