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TPA3110D2：protection circuit

user4096106
Prodigy 60 points
Part Number: TPA3110D2


When let the probe of the oscilloscope contact terminal "RINP" to observe an input signal of [TPA3110D2], a protection circuit works; and FAULT [become L. Would you tell me the factor assumed on a circuitry?

  • 0
    TI__Mastermind 19890 points

    Hi,

    I can not fully understand what you mean. Do you mean that Fault happened when the probe contacted the RINP?

    Regards,

    Derek

  • 0 in reply to Yanming Gong
    Prodigy 60 points

    After producing the speaker amplifier board which was "TPA3110", there was sometimes the case that "FAULT" became "L" at the time of power supply injection.
    Therefore "RINN" put "RINP" by the probe of the oscilloscope "LINN" "LINP" of "TPA3110" to confirm the state of the input signal of "TPA3110".
    As a result, "it was OK," but "FAULT" became "L" by all means "LINN" "LINP" when I put a probe on "RINN" when I put a probe on "RINP".
    Would you tell me what is assumed as a factor of this result?

  • 0 in reply to user4096106
    TI__Mastermind 19890 points

    Hello,

    I did not understand what's the mean："RINN" put "RINP" by the probe of the oscilloscope "LINN" "LINP" of "TPA3110" .

    Only Over Temperature, DC detect and Over Current can trigger Fault issue.

    What's the output power when the issue happened?

    You can check the temperature and output current when the issue happened.

    If the fault only happened when the probe contacted the input pin, I think that is related to DC detect, you can check the input caps.

    Regards,

    Derek

  • 0 in reply to Yanming Gong
    Prodigy 60 points

    Thank you for your answer.
    I reply it in the following.
    １．As I do not connect a speaker to the output of the trial manufacture board, I think that you may almost regard the output as "0".
    ２．As I connected "FAULT" to "SD", it became output off and was not able to measure the output electric current.
    In addition, it is in condition not to change with ambient temperature about the temperature either.
    ３．The input capacitor is "4.7μF". In addition, it was similar when I changed the input capacitor to "1μF".

  • 0 in reply to user4096106
    TI__Mastermind 19890 points

    Hi,

    From my understanding, the fault happened without speaker connection, right?

    Connect the FAULT and SD, the output was off, so the FAULT pin become low, right?

    Did you disconnect the FAULT and SD to check FAULT is low or high?

  • 0 in reply to Yanming Gong
    Prodigy 60 points

    Hi,

    I connect "FAULT" and "SD" about the trial manufacture board from a beginning.
    In addition, I connect the speaker to the output when I check the operation.
    However, I took off a speaker and confirmed the signal of the board circuit as a sound was not output by a speaker even if I input voice.
    I made this state, and connection part) of "FAULT" and "SD" was "Hi", but it was in "Low" at the beginning when I turned on a power supply again when I exposed the probe of the oscilloscope to "RINP".
    The DC detection seems to work when I measure the time when this signal is in "Low" from "Hi" some other time as it was about 420ms.

  • 0 in reply to user4096106
    TI__Mastermind 19890 points

    Hi,

    What about the input signal? is it sine wave?

    What's the output power? did you reduce the power and check again?

    Can you share the schematic to me?

  • 0 in reply to user4096106
    TI__Genius 11090 points

    Hi,

    Is there more feedback? I will close this topic now, if feedback, just post on this thread.

    Dylan

  • 0 in reply to Dylan Yao
    Prodigy 60 points

    Hello.
    １．The input signal is 100mV in a sine wave.
    ２．I removed TPA3110D2 which I implemented on a trial manufacture board, and after attaching another TPA3110D2, and examining it, the deficient movement disappeared.
    ３．This malfunction is thought to have occurred by a soldering state of the IC not having been good.

    About this inquiry, thank you for giving me an advice in various ways.