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DRV2605L: What are maximum output voltage and output current supported by DRV2605L IC and DRV2603 IC?

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Replies: 5

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Part Number: DRV2605L

Hello, 

I am planning to use either DRV2605L or DRV2603 in an application. I couldn't find the maximum output voltage and output current values supported by the ICs in the corresponding datasheets. Please answer the below queries inline.

1) What are the maximum output voltage and output current supported by DRV2605L?

2) What are the maximum output voltage and output current supported by DRV2603?

3) Also please tell the approach to figure out the maximum output voltage and output current.

These details help to select an appropriate haptic actuator.

For your reference - 

Datasheet of DRV2605L: http://www.ti.com/lit/ds/symlink/drv2605l.pdf

Datasheet of DRV2603: http://www.ti.com/lit/ds/symlink/drv2603.pdf

  • Hi, Saiteja,

    Please take a look at my answers below and let me know if you have additional questions or comments on this.

    1) What are the maximum output voltage and output current supported by DRV2605L?

    The DRV2605L has different output modes and the maximum output voltage depends of the output configuration. Basically, it would depend of the output load (LRA or ERM) and the feedback mode (open or closed loop).

    • ERM + open-loop / LRA + open-loop:

    When the open-loop is being used, the maximum peak voltage is determined by the overdrive voltage clamp. This parameter determines the maximum allowed voltage or full-scale reference voltage. If a PWM input is being used, its 100% duty cycle will represent this OD_CLAMP parameter. Equation 8 and 9 are used to calculate the output peak voltage in ERM and LRA modes respectively: http://www.ti.com/lit/ds/symlink/drv2605l.pdf#page=25.

    • ERM + closed-loop / LRA + closed-loop:

    In the other hand, when the output is configured in closed-loop, it is important to mention that there are two parameters involved in the output voltage. Again, the OD_CLAMP parameter is used to calculate the maximum peak voltage (see equations 6 and 7 for details). However, this peak voltage is only reached during the auto-calibration stage. Once the calibration procedure is complete, the maximum output voltage is controlled by the RATED_VOLTAGE. This parameter is used to calculate the full-scale voltage in steady-stage: http://www.ti.com/lit/ds/symlink/drv2605l.pdf#page=24

    2) What are the maximum output voltage and output current supported by DRV2603?

    The DRV2603 doesn't have integrated I2C communication, which makes the output voltage calculation easier. The DRV2603 has a fixed differential output voltage for the LRA and ERM modes. For the LRA mode, the max output voltage is fixed at 2.2Vrms. In case of the ERM mode, the max output voltage is set at 3.3V. Evidently, if the PWM input is configured at 100% full-scale mode, these voltages will be reached.

    3) Also please tell the approach to figure out the maximum output voltage and output current.

    The output current will depend of the load impedance and the output voltage. It is a single operation of Imax = Vmax/R that results in the maximum current.

    I hope this helps. Please let me know if you need additional information. We will be glad to help you. 

    Best regards,
    Luis Fernando Rodríguez S.

  • In reply to Luis Fernando Rodriguez S.:

    Dear Luis Fernando Rodriguez S, 

    Thanks for your reply. 

    I understood that voltage can be calculated from the equations given in the datasheet.

    I would also like to know the absolute maximum voltage and current can be drawn from the IC without causing any damage to it.

    Awaiting your reply.

  • In reply to saiteja manchukanti:

    Hi, Saiteja,

    The output voltage is limited to the configured RATED_VOLTAGE and OD_CLAMP. As shown in figures 26 and 27, having a full-scale voltage in PWM or RTP format will reach the configured RATED_VOLTAGE or OD_CLAMP. If both parameters are configured at the max value (0xFF), they will result in a max output voltage of 5.5V (basically, the max VDD value).

    As mentioned in the recommended operating conditions, the minimum load that can be connected is 8ohms. If this impedance is decreased and constantly exposed to the maximum output, it may result in a device damage. So, the maximum current that the device could handle is 5.5V / 8 ohms = 69mA.

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

    Best regards,
    Luis Fernando Rodríguez S.

  • In reply to Luis Fernando Rodriguez S.:

    Dear Luis Fernando Rodriguez S, 

    Thanks for your reply. 

    Just to be clear on both sides, 5.5V/8 ohms is 687.5 mA. It is not 69 mA. Am I correct or missing something?

  • In reply to saiteja manchukanti:

    Saiteja,

    Thank you for your correction. I would mean ~690mA.

    Best regards,
    Luis Fernando Rodríguez S.