• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 29 subscribers
  • Views 344 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TAS2557: TAS2557 + LEARNING BOARD + PPC3 volume can't not up

Simon Yuh
Prodigy 110 points
Part Number: TAS2557

We use  TAS2557 + LEARNING BOARD + PPC3,want to see realtime sep & stp. 
in PPC3 rule,we need go to the Turning and Audio Processing page at first.

but in this page,amplifier volume force to -10dB(if use 4Ohmn speaker ,output power=1W)

Even if we increase the input volume stream over than -10dB, the volume will remain at -10dB 

Down picture is behavior

 

In conclusion ,how can we up the volume to 0dB ?
  • 0
    TI__Guru** 105485 points

    Hi Simon,

    First let me clarify that Learning Board is only required during speaker characterization. Other than that you may use the EVM only for evaluation and tuning.

    Regarding the attenuation you see at the output, it may be because the speaker model is incorrect. Let me ask a few things:

    • Have you completed the speaker characterization?
    • (You may first reduce the input amplitude. Do this carefully as high output voltage may damage your speaker) Within PPC3, if you access "Test and Measurement" panel, then click on either ROM Mode 1 or 2. Do you have larger output?
    • (You may first reduce the input amplitude. Do this carefully as high output voltage may damage your speaker) Within PPC3, if you access "Tuning and Audio Processing" -> "Smart Amp", then click on the "flip" icon on the top corner of "Characterization Data", modify Xmax = 10 and Thermal Limit = 1000. Do you have larger output?

    Let me know if there are any questions.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0
    Prodigy 110 points

    HI Ivan,

    Thanks for your help 

    We set Thermal Limit = 1000，speaker can output large volume now

    We want know why speaker temperature  doesn't close our limiter(we use thermal Limit = 80 before)
    but volume is limited

    Best regards,
    -Simon

  • 0 in reply to Simon Yuh
    TI__Guru** 105485 points

    Hi SImon,

    For the speaker protection (thermal and excursion) to work properly, the speaker model has to be correct, otherwise the algorithm may trigger the protection unnecessarily.
    As I mentioned before, have you run the speaker characterization process successfully? The characterization data should be close to your speaker data sheet parameters.

    Best regards,
    -Ivan Salazar
    Applications Engineer