• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 31 subscribers
  • Views 4573 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.

TPA3110D2 DC Detect Issue help

cg xie
Intellectual 260 points

Other Parts Discussed in Thread: TPA3110D2

Dear Sir,

          Today I just found one TPA3110D2 board with DC detect issue(420ms cycle shutdown), but I can't find the reason.  Here is the sch,

 

 

 

 

I have removed C194/C193/C205/C206, C187/C186/C208/C207, and the error still existed. I've no idea about what can cause the issue.

And when it happened the GVDD was 5.2V.  The good board GVDD is 6.8V.

 

 

  • 0
    TI__Guru**** 189401 points

    Hi, cg,

    I don't believe you are tripping the dc detect --> that is a latched fault that can only be cleared by power cycling the device.

    It looks to me like you're tripping the short-circuit protection. Your output filter component values look a little odd to me, but I see you already removed C187/C186/C208/C207.

    Then perhaps this is a thermal issue, and you're tripping the thermal protection? How much output power are you trying to drive?

    -d2

    PS We have a nice app note on LC filters. You can find it here.

  • 0 in reply to Don Dapkus
    Intellectual 260 points

    Hi Don,

        You are right. It is tripped by another TPA3110D2 because the 2 pieces of TPA3110D2  SD pins connecting together. And what LC values should I use? I've read SLOA119A page 12， there are four LC values for 4 OHM load. Which one is best? Thanks.

  • 0 in reply to cg xie
    TI__Guru**** 189401 points

    Hi, CG,

    Wow, THAT'S a new one!!! I'll have to remember that for future debug sessions!

    As for the filter, I'd go with the first or third one. I think the third may have a little higher power consumption, but I haven't measured it. 

    -d2