TPA3122D2: Gain Pins Effect on Max Output Power

Daniel Potts

Part Number: TPA3122D2

I'm designing an amplifier with a 12V power rail using the TPA3122 IC with single ended outputs. Using the two gain setting pins (GAIN0 and GAIN1), the gain of the IC can be set to 20dB, 26dB, 32dB, or 36dB. I'm confused on calculating output power for the varying gain settings, as the power output figures (Fig. 11 and Fig. 12) only reference the 20dB setting.

over 4 years ago

0 Yanming Gong over 4 years ago

TI__Mastermind 19340 points

Hi Daniel,

You can refer the below calculator to evaluate the output power.

0 Daniel Potts over 4 years ago in reply to Yanming Gong

Prodigy 110 points

Hi Yanming,

So in the case where I'd want to calculate the power output at 36dB gain settings, would I just increase the peak amplitude by 16dB (from 20dB to 36dB) or approximately 6.3 V/V?

Thanks,

Dan

0 Yanming Gong over 4 years ago in reply to Daniel Potts

TI__Mastermind 19340 points

Hi Daniel,

For sine waveform signal, the calculation can be below, and you can calculate the power according to the load.

0 Daniel Potts over 4 years ago in reply to Yanming Gong

Prodigy 110 points

Perfect. Thank you.

Audio

Audio forum

TPA3122D2: Gain Pins Effect on Max Output Power