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EMC testing of CLASS D amplifiers (for CE and FCC)

Ahmed Razak
Prodigy 10 points

I'm conducting EMC testing fro my design using Class D audio amplifier. (Actual device is TAS5615DKD). The board has been carefully laid out to minimise RF emissions. However emissions are high enough to fail the CE and FCC requirements particularly in the range of 55-200 MHz region. I'm carrying out a few modifications to the circuit to try to reduce emissions. In the mean time has anyone been involved in reducing emissions from a class D amp and can let me know what modifications they have made so I can also try these as well? Thanks.

  • 0
    TI__Genius 11680 points

    Ahmed,

    The EVMs for our devices are always designed with the best EMC and noise performance in mind. It is especially important with a high powered part like this that your circuit design and layout match our EVM for optimum performance. Any adjustments you can make to bridge the gap between your design and ours will net you better performance in audio quality, EMC, and thermal dissipation.

    You can check out the presentation linked on these forums for additional information on things to consider when laying out a board for a Class D APA. It is found here: http://e2e.ti.com/support/amplifiers/audio_amplifiers/f/6/p/52180/184516.aspx#184516

    - Nate