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DRV2667EVM-CT: DRV2665 Gain Settings

Jeroen Dammers
Prodigy 30 points
Part Number: DRV2667EVM-CT
Other Parts Discussed in Thread: DRV2665, DRV2667

Hello!

For a development project I'm using a DRV2665 driver in combination with a TDK PowerHap. 

The development kit DRV2667EVM works perfectly, so I copied that driver schematic into my own project.

However the driver gets really hot/broken when I try to set it in 105V boost settings in my project.

What is the correct method for that?

Is there a certain sequence that has to be followed at start-up for the gain settings?

Best regards,

Jeroen

  • 0
    TI__Mastermind 19485 points

    Hi Jeroen,

    This doesn't sound like a power sequencing issue to me. If the device is heating up significantly then it may be due to the configuration of the boost. 

    What is the value of Rext and the specs of the boost inductor(Isat and inductance)?

    Regards,
    Arthur

  • 0 in reply to Arthur Brown
    Prodigy 30 points

    Morning Arthur,

    Well, I don't see that heat up on the development board, that's what I find weird.

    Same values are used as development board:

    https://www.ti.com/lit/pdf/slou323 (page 26)

    Also Inductor matches those values.

    Only thing I changed is using a fixed R2 value, since they switch R3&R4 for gain on the development board.

    Best regards,

    Jeroen

  • 0 in reply to Jeroen Dammers
    TI__Mastermind 19540 points

    Hi,

    Please wait 12-24 hours for our audio expert to comment.

    Thank you for your patience

  • +1 in reply to Jeroen Dammers
    TI__Mastermind 19485 points

    Hi Jeroen,

    It wont be an issue with the gain settings, we have had many customer systems which have the FB resistors hard wired to 105V

    If you want to test if the device start up configuration is the issue you can do this. connect the I2C from the EVM header (SCL/SDA/GND), and remove the "DRV" jumper which controls where the DRV2667 is powered from. then power up the system the same way you would have when evaluating the EVM. the MSP430 and GUI will see the DRV2667 on your board and you can control it as if it was on the EVM

    If you have the overheating issue then you can know that the issue is related to the hardware and not the software.

    Regards,
    Arthur

  • 0 in reply to Arthur Brown
    Prodigy 30 points

    Hey Arthur,

    Thank you for your help! Think I got it figured out now.

    Still heats a tiny bit, but the dev-kit also has a big metall plate attached; so that also explains why it is slightly colder.

    Best regards,

    Jeroen