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DRV2605: DRV2605 VDD supply value for LRA driving force

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Replies: 4

Views: 94

Part Number: DRV2605

Hi TI:

1. DRV2605 max driving force for attached LRA is related to VDD supply value?

2. DRV2605 for attached LRA is voltage drive or current drive?

3. Which one is better? VDD supply connect fixed 5V or VBAT(3V~4.2V) ? If VBAT down to 3V, still can drive attached LRA to its  max rated current(60mAms @ 1.8Vrms AC, sine wave)?

Thank you~~

BR/Poki

20190322 LRA-0412(NZ-G006) SPEC-规格书.pdf

  • Hi, Poki,

    Please take a look at my responses below.

    1.- Yes, the VDD supply is the power supply for the attached LRA. Basically, the DRV2605 is used only for control the voltage level at the LRA. As you may see in the datasheet's block diagram, the gate drive will be used to control the switching of the MOSFETs. All the current (and consequently, the actuator driving force) will be determined by the VDD supply.

    2.- DRV2605 is voltage drive for the attached LRA. The voltage level is fixed for the LRA load.

    3.- I would recommend to use the fixed power supply. There are some parameters that depend of a voltage level such the overdrive voltage. Having a low VDD level may affect the overdrive level since it cannot exceed the power supply level.

    I hope this was clear. Please let me know if you have additional questions or comments.

    Best regards,
    Luis Fernando Rodríguez S.

  • In reply to Luis Fernando Rodriguez S.:

    Hi Luis:

    So no matter VDD supply is 5V or 3.8V, the voltage to dirve LRA is the same right?

    What is the voltage value?

    thank you~~

    BR/Poki 

  • In reply to Poki Huang:

    Hi, Poki,

    The output voltage is determined by the RATED_VOLTAGE and CLAMP_VOLTAGE parameters. Both parameters are used to specify a percentage of the full-scale voltage (VDD) that will driver the output.

    Sections 7.5.2.1 and 7.5.2.2 ( http://www.ti.com/lit/ds/symlink/drv2605.pdf#page=22 ) have more details on how to configure the output based on these parameters.

    Please let me know if you have questions or comments on this.

    Best regards,
    Luis Fernando Rodríguez S.

  • In reply to Luis Fernando Rodriguez S.:

    Hi Luis:

    Thanks

    I will close the issue

    BR/Poki

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