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TPA2006D1: Sound pressure

Koshi Ninomiya
Expert 5455 points
Part Number: TPA2006D1

Tool/software:

Dear Team,

My customer is evaluating the TPA2006D1 with single-ended input application. And they have some questions about application setting.
Is it possible that the resistance value and capacitor on the GND (IN+) connection side of the single-ended input have the following effects?
#1: Does the sound pressure (output voltage and current of the TPA2006D1) of the speaker become smaller if the RI indicated in red circle is larger when the speaker is driven at around 0.8 to 4 kHz?
#2: Does the CI in red circle change the relationship between the speaker drive frequency and the sound pressure (output voltage and current of the TPA2006D1) when the speaker is driven at about 0.8 to 4 kHz?

When the clicking sound happened when the shutdown was released, they adjusted the constants of RI and CI in the red circle (RI large and CI small).
When they measured the sound pressure of the speaker with the adjusted one, the sound pressure of the speaker was slightly lower, and they though that the above sonstant adjustment has an effect.

Best Regards,

Koshi Ninomiya

  • 0
    TI__Guru** 109055 points

    Hi Koshi,

    The amplifier gain is given by the value of the input resistor Ri, this value should be the same for inverting and non-inverting inputs, even if using single-ended input. If you change the Ri value on the non-inverting input, it can still affect the gain.

    Similarly, the combination of Ri and Ci affects the frequency response (these components form an input high-pass filter), if you change the components even on one of the input sides it may affect the overall resulting response.

    Best regards,
    -Ivan Salazar
    Applications Engineer