• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 29 subscribers
  • Views 9211 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.

TPA3110D2: TPA3110 Heat Up with Low AVCC ?

Wayne Chen (ex FAE)
Guru 15950 points
Part Number: TPA3110D2

Hi Sirs, 

We found the TPA3110's surface temperature becomes very hot in idle mode with low AVCC supply voltage with wrong 10kOhm input resistance at AVCC pin. It becomes normal with 10Ohm resistor replaced. Would you please advise why the low AVCC supply voltage could result high body temperature? Do we have AVCC power consumption data? 

  

Thank you and Best regards,

Wayne Chen
02/20/2017

  • 0
    TI__Mastermind 24835 points

    Hi Wayne,

    One 10ohm resistance is used between PVCC and AVCC to keep high frequency class-D noise from entering the linear input amplifier. The current on AVCC is around 9 mA. So normally the voltage difference between PVCC and AVCC is very small.

    10K ohm is pretty high value for this case. If a so high value resistance is used between PVCC and AVCC, the voltage drop from PVCC to AVCC is very large, then AVCC could be too low to make the device start working. So, there shouldn't be a very high temperature on the surface. 

    Could you please check the voltage and current on PVCC and AVCC in this case? Where is PVCC from? Could the high temperature be from the other device on the board?