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TPA3106D1EVM: Maximum reachable output power before significant output signal clamping is below 30W

Part Number: TPA3106D1EVM

Hi,

We have a customer with below concern:

Maximum reachable output power before significant output signal clamping is below 30W while the value claimed in the datasheet is 40W
under test conditions specified in the datasheet as standard: i.e. the load is 8 ohm, DC power supply is 24V

We have confirmed that jumpers are used to have the same 20dB gain as in the datasheet.

Issue with output power _TI TPA3106D1 Audio Power Amplifier EVM.docx

Appreciate your assistance.

Roland

  • Hi Roland,

    When measuring power above clipping the Vrms calculation is not the same as a sinusoidal waveform.  As the clipped waveform is not a sinusoid anymore.  We use an Audio Precision to measure the rms voltage and power to generate our datasheet specifications.  The specification quoted is 40W at 10% THD which is a clipped waveform.  With a 24V power supply, I see you are getting 2V of drop somewhere at the maximum voltage is 22V. Using figure 16 in the datasheet, the 1% THD power is just at clipping and the power at 22Vdc is 27W.  You are slightly higher than that.  At 10% you should get about 34W, although the maximum voltage is still at 22Vdc.  A rule of thumb is to multiply the 1% THD by 1.25 to get the 10% THD power rating.