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Part Number: TPA6133A2
We are evaluating TPA6133A2 evm module. We are testing ( testing setup fig. 2) the output power of the TPA6133A2 using two different voltage levels (3.3V and 5V). We are unable to find any significant difference in the perceived audio level between the two voltage levels while listening through earphones. In the datasheet pg 5, appended fig.1 (it is mentioned that output power varies with different voltages).
Why there is no increase in loudness while giving 5 V to the TAP6133A2.
Voltages given to evm:
a) 5 V input
b) 3.3 V input
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In reply to Ivan Salazar:
We have used TPA6133 EVM module in the above experiment. Is there any procedure to set THD+N to 1% and why it is important. I am unable to get the physics behind setting the THD+N to 1 % .
I am sharing the screenshot of the experiment, the voltage in the oscilloscope is that taken across 33 ohm resistor. According to the datasheet the 5V will have more power as mentioned in the previous thread.
Input signal: 200mV
Outup signal: 322mV
Fig a) 5V given to the TPA6133 EVM
Fig b) 3V given to the TPA6133 EVM
As you can see there is no difference in the voltage level between the two setup.
In reply to Tapas Pandey39:
You have mentioned that some equipment like AP can measure THD+N. Can you expand the abbreviation AP.
According to the line levels in the consumer audio space maximum voltage is 0.894 VPP. I think it should be dependent on load. We can only increase the input signal to the amplifier such that voltage across load should be around 0.89VPP. Is that correct.
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