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TPA3110D2 FBs with long speaker wires

Mahendrakumar Reddy Ippagunta
Intellectual 575 points
Other Parts Discussed in Thread: TPA3110D2

Can we use TPA3110D2 with ferrite beads instead of LC filter  with speaker wires of approx 5 mtrs length? Regulatory compliance is not required. 

Thanks

-m

  • 0
    TI__Intellectual 1050 points

    Hello M,

    The answer to your question is that the TPA3110D2 will function with ferrite beads even with speaker wires of up to 5 meters -- of course, at that distance, performance will certainly depend on your PCB design and other factors, such as output power level. There are plenty of design suggestions within the data sheet itself. That particular combination is not guaranteed to pass EMC/EMI tests, however.

    Regards,

    Arnold Zhang

  • 0 in reply to Arnold Zhang
    Intellectual 575 points

    Hi Arnold,

    Thanks for the answer. We are looking at 10-12W into 4Ohms load with 14V-16V supply. No need to pass EMC/EMI. What care needs to be taken on the PCB layout? Is it about thermal pad or something else?

    -m

  • 0 in reply to Mahendrakumar Reddy Ippagunta
    TI__Guru**** 189399 points

    Hi, Mahendrakumar,

    The closer you copy the EVM design, the better your chances for success...

    -d2

  • 0 in reply to Mahendrakumar Reddy Ippagunta
    TI__Intellectual 1050 points

    Hello M,

    It is not advisable to pursue a 5 meter output wire with that level of output power and supply voltage.

    With regard to the board design, here are a few highlights on the datasheet you may wish to look at:

    Ferrite Bead Filter Considerations (22), When to use an output filter for EMI Suppression (24), Power supply decoupling (26), Printed-circuit board (PCB) Layout (27)

    Regards,

    Arnold Zhang