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TAS5614a output capacitors issue

Hoi Wa Ip
Intellectual 720 points
Other Parts Discussed in Thread: TAS5614A, TAS5342A

Dear All,

I have an audio project which leveraged TAS5614a to build a bluetooth speaker. During the course of development and testing, we noticed that the output capacitors  C91,C92,C88,C42,C39,C40,V41 (see below schematic) are extremely hot. Is there any suggestion to remedy this overheat problem? Peter    

  • 0
    TI__Mastermind 30030 points

    Hello Peter,  

    That does sound unusual. I just want to ask a few questions before I make any suggestions. 

    What kind of capacitors are you using there?  Typically we use smd ceramics on our EVMS and they tend to stay pretty cool.  for C88 and C87 we use 250V metalized Film capacitors.  if you are using metalized film caps,  the ESR tends to be higher on the lower voltage versions and thus,  they will get hot and potentially fail. 

    you mentioned that C88, C91 &C92 get hot,  but you didnt list C87, C89 & C93?   do only the listed capacitors get hot? 

    In general I recommend reading our Application note entitled "LC filter design" if you haven't already.  just search the TI site for the document number - slaa701a.   This document is an excellent resource when designing the LC filter.

    Best regards,

    -Steve Wilson

  • 0
    TI__Mastermind 30030 points
    Hi Peter,

    I just wanted to check back with you to see if the resources i mentioned were helpful, or if you were still having a problem.

    Its important to us to make sure that your issue is resloved, just let us know if we can be of any assistence.

    Best regards,

    -Steve Wilson
  • 0 in reply to Steve-Wilson
    Intellectual 720 points
    Hi Steve,
    The overheat problem has been resoloved and your suggestion really helping us locating the problem. Thank very much for your help.

    Best regards,
    Peter
  • 0 in reply to Hoi Wa Ip
    TI__Mastermind 30030 points

    You're welcome Peter, I'm glad we were able to help you resolve the issue.  

    best regards,

    -Steve Wilson

  • 0 in reply to Steve-Wilson
    Intellectual 720 points
    Hi Steve,
    I posted a new question titled as "TAS5342A driving 2.1 speaker". So far I got no response on it. I wonder if you are able to help. TAS5342A is used in another BT speaker project, to drive a 2.1 speaker. I would like to get some hints on how I should configure TAS5342A in order to drive 2.1 speakers. Peter