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TPA3106D1: How to measure audio power output for class d amplifier.?

Milind Jog
Prodigy 20 points
Part Number: TPA3106D1

I am trying to build a class  d amplifier using TPA3106D1. I have used the same pcb layout provided with evaluation board with same component values. I have 2 problems

1. I get clear audio output  when my input signal amplitude is low. At higher input levels noise is predominant at output.

2. How should I varify I am getting 30W output as stated in the datasheet? As conventional method of applying sine wave at input and measuring output on CRO can not be applied, how should I measure power output?

  • 0
    TI__Mastermind 24835 points
    Hi Milind Jog,
    Generally speaking, this result is not reasonable. Could you please show us the screen captures on oscilloscope? Especially the waveform before inductance without input signal.
    Our method of output power measurement: use oscilloscope to measure the voltge at the opposite ends of the load, the difference is the output voltage. And use multimeter to measure the impedence of the load. Then calculate the power by the voltage and impedence.
    You could also provide your schemetic, we can help to review.
  • 0 in reply to Shawn Zheng
    Prodigy 20 points

    Hello Shawn Zheng

    The waveforms without i/p are triangular wave. I think that is what degrading performance of amplifier.  The schematic I used is the same one used in evaluation board of TPA3106D1.

  • 0 in reply to Milind Jog
    TI__Mastermind 24835 points
    Hi Milind,
    Could you please let me know what 'i/p' means? Do you mean that the issue was caused by the triangular waveform input?