TPA2011D1: Questions of TPA2011D1

Hi Jimmy,

The spec provided in data sheet is electrical power, for this you measure the voltage across the speaker and calculate the power given the speaker impedance.

Best regards,
-Ivan Salazar
Applications Engineer

Hi Ivan,

We appreciated your great support.

We want to drive the speaker (uses 8ohm 0.7w), but it seems Po is over now.

Could you help to guide us how to modify the schematic? adjust  R1408 and R1409?

Many Thanks,

Jimmy

Hi Jimmy,

What is the maximum input signal amplitude you expect?
The output range is the input signal times the gain; gain is adjustable with input resistors. In this case if you need the output signal to be lower, you must increase the value of R1408 & R1409.

Best regards,
-Ivan Salazar
Applications Engineer

Hi Ivan,

Is there a range of resistance values? Let’s try to increase R1408 R1409
It seems to be an improvement, but how high can the resistance be increased?
Is there a formula for calculating resistance?

Our schematic is single input. Thanks a lot.

Jimmy

Hi Jimmy,

You can refer to equation 14 on data sheet page 19: https://www.ti.com/lit/ds/symlink/tpa2011d1.pdf#page=19

Technically there's no maximum value for this resistor, however too high value would result in very low gain; also note that the value of this resistor affects the input AC coupling capacitor value as well, if you want to keep the same frequency response (see equations 15 & 16).

Best regards,
-Ivan Salazar
Applications Engineer