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DRV2605LEVM-MD: Power supply issue

?? ?
Prodigy 10 points
Part Number: DRV2605LEVM-MD

Tool/software:

Hi,

Recently, while using the DRV2605LEVM-MD, we encountered an issue where the EVB automatically reset or limits the current when driving multiple vibrators simultaneously.

Initially, we thought this might be a power supply issue. However, after testing with four different power supplies according to the User Guide, we discovered the following:

Result of our testing: Power Supply (VBAT) is set to 5V 1.6A. (Test in Haptic Control Console 1.6.0.2 / Real Time Mode)

DRV

MSP

Our Test Result

The information in the User Guide

VBAT

USB

Power supply limits the current to 500 mA, all eight vibration of vibrators are weak.

the use of the external power supply terminals with a current rating of 1.6 A is recommended (by User Guide, page 2)

VBAT

VBAT

When 3 or 4 vibrators are activated and the current exceeds 500 mA, the EVB will shut down.

the use of the external power supply terminals with a current rating of 1.6 A is recommended (by User Guide, page 2)

USB

VBAT

When the current is below 1.6 A (at recommended in the User Guide), all eight vibrators operate normally.

USB protocol allows for 500 mA per port (by User Guide, page 11)

USB

USB

When the current is below 1.6 A (at recommended in the User Guide), all eight vibrators operate normally.

USB protocol allows for 500 mA per port (by User Guide, page 11)

 

This behavior is inconsistent with the information in the User Guide. Could anyone please assist us in resolving this issue?

Regards,

Kevin Huang

  • 0
    TI__Genius 17780 points

    Hi Kevin,

    I see, so the issue is when you are supplying the driver device externally. When doing so, what is the current limit set on the power supply? 1.6 A or 500 mA? 

    Regards,
    Sydney Northcutt  

  • 0 in reply to Sydney Northcutt
    Prodigy 10 points

    Hi Sydney,

    When I use the power supply, the current is limited to 500 mA.

    Is there any register that needs to be additionally adjusted besides the jumper on the EVB?

    Regards,

    Kevin Huang

  • 0 in reply to ?? ?
    TI__Genius 17780 points

    Hello,

    No, only the jumper on the EVM needs to be changed.

    The USB is likely supplying more than 500 mA. Do you have it connected through some USB power strip? With only 500 mA it is unlikely to strongly drive all 8 actuators. From the UG: "Because USB protocol allows for 500 mA per port, a conservative estimate allows two to three actuators and drivers to be operated with USB power (150 to 200 mA worst case per driver or actuator, depending on the actuator)." You could measure the current going to the actuator to investigate further with USB power.

    Regards,
    Sydney Northcutt

  • 0 in reply to Sydney Northcutt
    Prodigy 10 points
    Got it, I will measure the actuator's current when using USB power.
    Additionally, why is the total current limited to 500 mA when using an external power supply?
    How can I operate multiple actuators (> 500 mA) on the EVB while using an external power supply?
    Regards
    Kevin Huang
  • 0 in reply to ?? ?
    TI__Genius 17780 points

    Hello, 

    My apologies I may have misunderstood. I thought you meant you set the current limit on your power supply to 500mA. What is the current limit set to?

    Regards,
    Sydney Northcutt 

  • 0 in reply to Sydney Northcutt
    Prodigy 10 points

    I have set the external power supply to 5V and 1.6A. However, I noticed that as I connect more actuators, the vibration intensity decreases. After measuring the total current, I found that it reaches about 500~600 mA and does not increase further, regardless of how many additional actuators I connect. The current seems to be limited to about 500~600 mA.

    Could you please advise on how to address this issue?

    Regards

    Kevin Huang

  • 0 in reply to ?? ?
    TI__Genius 17780 points

    Hi Kevin, 

    It seems to me that this is an issue on the power supply side. With USB, all the drivers can sufficiently drive all 8 actuators, so there is no issue with the drivers or EVM. When you switch to external power, the performance degraded but the EVM changes are very simple. The only change is the power supply routing. 

    When you tried various supplies, were you trying the same kind? Are there any other supplies you can try? 

    Regards,
    Sydney Northcutt