• State
  • Locked Locked
  • Replies 6 replies
  • Subscribers 30 subscribers
  • Views 402 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.

TAS3251: TAS3251

khieu sy
Prodigy 80 points
Part Number: TAS3251
Hello Sir,

I've a project with TAS3251
My design is working but have some issue,
1 :When TAS3251 was working I saw some small noise on output, it looked like DC noise.
 
   My design uses MT9050 from mediatech to control I2c and I2s.
 
   It is SCH and PCB design for TAS3251.
 
   Do you mind helping to check them?
 
2: When mt9050 does not control tas3251 by i2s and RESET_AMP pin pull hight, my heatsink gets pretty hot.
    Is that normal?
  • 0
    TI__Mastermind 19080 points

    Hi,

    For high power applications, ferrite beads are strongly NOT recommended for EMC concerns. Any background that you are not using inductors?

    The chip gets hot because you are using 0.68uF cap combined with ferrite beads. 0.68uF is good for inductor but not for FBs. It will increase the switching loss of the device significantly. If you remove the 0.68uF caps, the device should not dissipate lots of power.

    Regards,

    Sam

  • 0 in reply to Sam(MPAA) Zhang
    Prodigy 80 points

    Hi sam,

    Thanks so much for your answer.
    Sorry my label is wrong.
    I tried 10uH for my new design but the problem did not improve.
    It is an inductor on my design: CEP125NP-100MC.
    I calculate the value inductor with the tool on TI website.
    It is my gerber.
    Regards,
    KDS
  • 0 in reply to khieu sy
    TI__Mastermind 19080 points

    Hi,

    For the schematic,

    • 1uF for PVDD decoupling is necessary. Please refer to the attached file for EVM layout.
    • As you are leaving the MCLK floating, I suppose you are using the 3-wire slave clock mode. Please just make sure that you have the correct register settings accordingly.

    Could you measure the power consumption on PVDD rail in the status your heatsink got very hot? Please also check the output pins to see if it's switching and output power.

    Thanks!

    Regards,

    Sam

  • 0 in reply to Sam(MPAA) Zhang
    Prodigy 80 points

    Hi sam,

    The noise problem was solved when I dropped the C8 and C15 on my design, but the temperature still hasn't improved.


    PVDD is completely normal when I try sine wave (youtube) to evaluate the quality of the design.

    Something seems wrong with my design, it seems.

    The heatsink is very hot even though the system only operates at 50W for both channels.


    this is the heatsink for my design with the thermal aluminum case design will be led straight from the heatsink to the aluminum housing.

    Regards,

    KDS

  • 0 in reply to khieu sy
    TI__Mastermind 19080 points

    Hi,

    May I ask what loading you are using? Speaker resistance?

    Is it possible for you to measure the input current and output voltage? So we can calculate the efficiency and compare with numbers on datasheet.

    BTW, it's necessary to add MLCC decoupling caps on PVDD pins and they should be placed as close as possible to the pins. Or the inductive high voltage spike due to high di/dt at switching edges may kill the part.

    Thanks!

    Regards,

    Sam