Power amplifier

Josh5566

Prodigy 190 points

Hi sir,

We used the TPA3113D2PW now, but the thd+n is more larger at 10% in 4ohm.

Could you suggest the similar pa solution for our block diagram, we need low thd+n from.

over 5 years ago

0 Yanming Gong over 5 years ago

TI__Mastermind 19900 points

Hi,

What's about your measure method? Did you add AES-17 filter in AP instrument?

And is there LC filter on TPA3113 output? If no, please add filter to filter high frequency noise.

Regards,

Derek

0 Josh5566 over 5 years ago in reply to Yanming Gong

Prodigy 190 points

Hi sir,

We played youtube music and learned volume in maximum, they felt breaking sound.

I already limited to 2.43W from PLIMIT as the speaker is 3W. please see the figure

Could you suggest to add the filter what value they are? attached the circuit for PA.

8640.SCHEMATIC1 _ 19 AUDIO-AMPIFIER_.pdf

0 Yanming Gong over 5 years ago in reply to Josh5566

TI__Mastermind 19900 points

As I talked before, you do not use LC filter, so you must use external filter to filter high frequency noise. And you should use AP instrument to measure THD performance, and you muse add AES-17 filter in AP.

0 Josh5566 over 5 years ago in reply to Yanming Gong

Prodigy 190 points

Hi Sir,

Sorry, I make a mistake. because I set plimit too low cause the signal distortion.

To set larger at 5W in plimit, it seems like great for volume.

If I want to set limit 4W,what is the plimit voltage ?

Thank you.

+1 Yanming Gong over 5 years ago in reply to Josh5566

TI__Mastermind 19900 points

You can refer the calculation in datasheet part 7.3.3.

For you application 4W/1% THD, you should set Plimt to 1.7V

Regards,

Derek

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