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TAS2770EVM: VI-sensing defective. Sensed voltage is clipped.

Kim Therkelsen
Prodigy 155 points
Part Number: TAS2770EVM
Other Parts Discussed in Thread: TAS2770

The VI-data are recorded through the USB interface on TAS2770EVM. Until recently it worked fine but now the sensed voltage signal is clipped. However, the output from the amplifier is not clipped and the sensed current signal is not clipped:

The power supply is delivering 12.6VDC and the amplifier is set to 17.5dBV. I have tried other configurations as well but the sensed voltage is still clipping.

Is the board defective or can I reset it somehow?

  • 0
    TI__Guru* 84915 points

    Hi, Kim,

    Welcome to E2E and thank you for your interest in our products!

    Could you share again the picture of the sensed current and voltage you mentioned? I'm not able to see it.

    In addition, could you share the details about your configuration on PPC3 and the audio recorder? Do you have some pictures or files you can share for better details.

    Thank you.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 155 points

    Hi Luis,

    I hope this time the picture will stay visible. The screenshot is from Adobe Audition. First channel is sensed current and second channel is sensed voltage.



    Unless there is a way to reset the board, I think there is a good chance that the board is defective. We have purchased another TAS2770EVM board and it does not have this problem. I have checked the jumper settings are identical and the settings in ppc are identical.

  • 0 in reply to Kim Therkelsen
    TI__Guru* 84915 points

    Hi, Kim,

    Thank you for your feedback. There shouldn't be difference from board to board if all the conditions are the same. Is the IV sense behavior reproducible in both boards all the time?

    Thank you.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 155 points

    Hi Luis,

    The new board works and the old one does not work anymore. By that I mean that the new board voltage sensed data is not clipped. As you can see from the screenshot, the sensed voltage from the old board is clipped. The old board worked fine earlier and we do not know what has caused it to become defective. The IV sense behavior is reproduceable all the time.

    It is only a few months since we purchased the "old" board, so I think we should return it and get a new one. Unless the problem can be handled by somehow resetting the board.

    Best regards,

    Kim Therkelsen

  • 0 in reply to Kim Therkelsen
    TI__Guru* 84915 points

    Hi, Kim,

    In case you have not exposed the board to out of specs conditions, I think you can submit a request for an EVM return:

    https://www.ti.com/support-quality/additional-information/customer-returns.html

    I'm not aware of any reset procedure for this board.

    Another option could be to replace the TAS2770 units on the board in order to see if they were damaged.

    Best regards,
    Luis Fernando Rodríguez S.