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TPA3110LD2 Interfere with radio

Darren Yang
Expert 2000 points
Other Parts Discussed in Thread: TPA3136D2

Hello，we use TPA3110LD2 for design 1*25W  4ohms，in my design，there is have MP3 Bluetooth radio with amp board，now we face same question is that when using TPA3110L will be occur Interfere with radio，now we use CS8618 to replace TPA3110L，it will be ok，because CS8618 and TPA3110L is P2P，but now we want to TPA3110L replace CS8618，but need to solve Interfere with radio issue，beside，middle Power，now we also have used TPA3118/TPA3116 MP，TPA3118 and TPA3116 also meet the same question，could you help to give same suggestion for me to solve it，below is current Schematic for CS8618 is same to the TPA3110L，tks！

  • 0
    TI__Expert 6985 points
    Hello Darren! Shawn can take a look at your layout, but have you also looked at the www.ti.com/.../TPA3136D2 ? Our newer devices are designed to be inductor-free and with much better EMI performance. Thanks, Jeff
  • 0
    TI__Mastermind 24835 points
    Hi Darrent,
    Let me clarify the question first. There are MP3/Bluetooth/Radio module and an audio amplifier on your board. When play music by MP3 or Bluetooth, there is no problem. But if play Radio(AM/FM), the output sound is bad. Is my understanding right? Here 'interference' means that the class-D audio amplifier degrades the AM/FM radio performance, right? From the SCH, you are using inductors(L11, L12) for the output filter, right? If yes, it's strange. Because there shouldn't be any EMI issue with inductors filter. If no, please try use inductors instead of ferrite beads to see if there is any improvement in radio performance. If yes, it means that the interference is from the output of class-D.
    TPA3110 is a very old device, why don't you look into TPA3136D2 which has optimized EMI performance? You can also simply substitute the device with TPA3136D2 if your PVDD is less than 14.4V.
    Best regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    TI__Expert 6985 points
    Hello Darrent! Did this work for you? Thanks, Jeff