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TPA3136AD2: Can I use TPA3136 (inductorless amplifier) to drive a LONG speaker wire (20feet)?

grant juel1
Intellectual 480 points
Part Number: TPA3136AD2


The Application Report SLOA234A states that it can be used without an LC filter up to 1 meter long.   For my application one speaker has only 6" wires, while the other speaker could be 20 feet in length.   Does this mean that I can use ferrites for the short wires but must use an inductor / capacitor for the longer wires?

Is the use of an inductor acceptable?

  • 0
    TI__Mastermind 19080 points

    Hi,

    The main concern here is, longer wires behave as better antenna for radiated emission from EMC perspective. You will also get higher common-mode current on the loading wires in CEI test due to the more significant capacitive coupling between the loading wire and the earth. Using inductor+capacitor output filter can help on this, so LC filters are recommended for this case.

    Another point is, the distributed inductance/resistance/capacitance of the long loading wires are not negligible. You need to pay attention to that.

    Thanks!

    Regards,

    Sam