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TAS5615DKD damaged when we unplug and plug again audio input during it is running

vnlotus
Prodigy 240 points
Other Parts Discussed in Thread: TAS5615

Hello experts,

I'm very new in audio area and need your help on the issue of TAS5615DKDEVM I'm facing. Which is the amplifier TAS5615DKD will be damaged if I unplug audio input connection and plug it again when it's running. The EVM is powered at 44VDC, and the audio input is direct from DVD Player (the volume is at maximum level).  Anybody know what's issue? and how to solve it? Thanks

PS: It is run well if we get audio input plugged before turn power on.

  • 0
    TI__Genius 9670 points

    Depending on your input level (sometimes over 7Vrms) this may damage the board.  Can you measure your input signal?  If not, let me see if I can find more information for you.

    Also, here are a few questions that can help me out:

    1) Can you detail your input and output configurations?  Single-ended or differential source?  BTL or SE output?

    2) What position are the input jumpers (J24 and J25) in? Differential or Single-Ended.

    3) Can you confirm the TAS5615 IC is damaged and not the differential opamps?

    Thanks,
    Brian

  • 0 in reply to Brian Burk
    Prodigy 240 points

     Brian, thanks for prompt response. Pls find below for details required.

    I am thinking of ESD issue.

     

    Brian Burk said:

    Depending on your input level (sometimes over 7Vrms) this may damage the board.  Can you measure your input signal?  If not, let me see if I can find more information for you.

    Also, here are a few questions that can help me out:

    1) Can you detail your input and output configurations?  Single-ended or differential source (SE)?  BTL or SE output (BTL)?

    2) What position are the input jumpers (J24 and J25) in? Differential or Single-Ended (SE).

    3) Can you confirm the TAS5615 IC is damaged and not the differential opamps? Confirmed as the EVM will run well if i replace it by new one.

    Thanks,
    Brian

  • 0 in reply to vnlotus
    TI__Genius 9670 points

    What is your load?  What is happening is there is a spark/surge in the input capacitor which is causing the device to draw too much current at the output.  If your loads are speakers it may slow down this current due to the inductance of the speakers, but resistors will have no control over the quick increase in current.

  • 0 in reply to Brian Burk
    Prodigy 240 points

    I tried with 8ohm dummy load and 8ohm speaker, however such issue still happen.

  • 0 in reply to vnlotus
    TI__Intellectual 1595 points

    Can anyone help? Many thanks!

  • 0 in reply to vnlotus
    TI__Genius 9670 points

    My recommendation would be to turn the device off or mute it when applying the input.  Especially with large input signals this is causing the input capacitor to charge too quickly.  I am still investigating the issue and will have an answer shortly.

    Thanks,
    Brian

  • 0 in reply to Brian Burk
    TI__Mastermind 33420 points

    Hello Trong:

    Have you tried Brian's suggestion with muting the input before plugging into the EVM?  Will this solution be acceptable for the customer?  Is this input signal actually 7VRMS as I read on the above thread?  It seems kind of high, the customer will need to scale the input signal down if this is the case.  Please let me know.

    Thank you,

    Tuan

  • 0 in reply to Tuan
    TI__Intellectual 1595 points

    Anh Tuan,

    This solution could not be acceptable for the customer. However, from your advices, I am thinking of using a better power supply (SMPS) and also Schottky diode to protect from spark of input signal. I will inform you when I have the results. Thanks.

  • 0 in reply to Brian Burk
    Prodigy 240 points

    Brian, we want to use this design into karaoke amplifier product, and this might not acceptable as end user will unplug/plug input whenever they want. The power supply used to test this EVM is regulated one, so i dont think the issue will be resolved by adding in zener  diode. when waiting your next version, i will try to solve this issue by  using "plug-in detector circuit + delay circuit" to avoid issue caused by plugging. Thanks all and looking forward to the answer soon!

  • 0
    Intellectual 410 points

    Hi Lotus,

    How did you overcome this issue? What was reason for TAS5615DKD damage?

    Regards,

    Veera.