• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 504 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPA2013D1: Is there a threshold for audio input to initially wake or turn on amplifier?

Randy Nordlund
Prodigy 10 points

Part Number: TPA2013D1

Tool/software:

Hello,  I am utilizing the TPA2013D1 amplifier in a project and am having an issue with the amplifier not turning on initially unless I have the gain on the input source set very high.  I am able to send an initial signal audio signal with a very high gain and once I do that the device will play any audio file after it even if it is at what I would consider a normal level.  As long as I keep power to the device it will continue to work even with very low level audio signals.  Once I disconnect power I have to again "wake it up" with a high gain audio signal.  I'm new to designing amplifiers and not sure if there is a design flaw or if I missed something?  It seems like the system has a min input threshold to turn on the amp but once on it can except any level of signal?

  • 0
    TI__Guru** 114525 points

    Hi Randy,

    Can you share your schematic for review?
    Some signals that would be good to check with a scope:

    • Gain, SDb and SDd. Are these changing at all before and after applying a large input signal?
    • Vccout/Vccin. Can you check this signal before and after playing, both with small and large input signal?

    If you have a chance, you may test with the EVM and check if it shows the same behavior with the same input signal. The device should not require a large input signal to enable.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Randy Nordlund
    TI__Genius 10305 points

    Hey Randy,

    I'll be handling this thread while Ivan is Ooo. Allow 48hrs for a response to the schematic review.

  • 0 in reply to Ore Ogundana
    TI__Genius 10305 points

    Hey Randy, 

    Here are my comments on this schematic:

    • You have voltage powering the Shutdown Boost pin, SDb and Shutdown ClassD. SDd. These are GPIO pins and your schematic suggests they're not being treated as such. Removing the VCCOUT connections on pins 5&6 would take the device out of shutdown mode.
    • VCCFB shouldn't be powered by VCCOUT either. Please follow the recommended pin configurations provided by the DS in section 10.2.1.

    good luck,

    Ore.