• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 641 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.

TAS5631B: Could PWM signal from TAS5711 drive TAS5631B?

aggil liang
Expert 2660 points
Part Number: TAS5631B
Other Parts Discussed in Thread: TAS5711, , TAS5518, TAS5558, TAS5631

Dears

      we have design  active speaker used TAS5631B, but the pwm signal we use TAS5711 generate replace tas5518. Now we testing, we find that some issue. 

   when give 8 ohms load  to tas5631b, when it don't in clipping status , the output is ok, but when it in 10~30% chilpping status, the chip TAS5631B happen to damage , and so many times it is the same processs. 

So can you comfirm whether  PWM form tas5711 can give to TAS5631B, and need to attent. 

attach file is the sch , can you help to check ? thx

TAS5711 drive TAS5631B sch.pdf

  • 0
    TI__Guru 65420 points
    Aggil,

    Using a Class-D digital amp (TAS5711) for the front end before the PWM input TAS5631 is a BAD idea. We cannot support this. The customer should use a DAC or TAS5558 device before the TAS5631.

    The damage they are seeing is because there is probably a dead-time issue from the cascaded gate drive circuits, or the input is being over-driven. The inputs of the TAS5631 can only accept an absolute maximum input voltage of 4.2V relative to ground.

    Regards,

    -Adam