TPA3111D1EVM: The difference of two output ports

?? ??

Prodigy 20 points

Part Number: TPA3111D1EVM
Other Parts Discussed in Thread: TPA3111D1

Tool/software:

I have some questions about TPA3111D1EVM.

I don't know the difference between "OUT" port (MOLEX connector) and

"OUT+ & OUT-" ports (two banana plugs).

"OUT+ & OUT-" ports have second additional LC filters (L1&C11,L2&C16). On the other hand,"OUT" port has

only first LC filters(FB1&C10, FB2&C25).

According to Figure17 of 'TPA3111D1' datasheet, second additional LC filters seem unnecessary to connect

the speaker.

So I am confused.

The questions are below.

(1) What effect do you expect the second LC filters to have on.

(2) When shoud I use each of the two ports?

Regards

7 months ago

0 Ore Ogundana 7 months ago

TI__Genius 10305 points

Hey,

On the EVM, L1 and L2 are not populated so a short on JP3 or JP4 would lead the output signal through a common configuration for audio output. Ferrite bead filtering is for EMI avoidance. As you can see it's rating is in the MHz. If you want to use the LC filter, you can populate L1 and L2 to exercise a more dominant filter for the audio BW.

You can use either output ports depending on the performance and results you want out of your output signal.

I hope this was informative and I was able to help.

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Images:

L1 and L2 are not populated on the EVM:

Regards,
Ore.

0 ?? ?? 7 months ago in reply to Ore Ogundana

Prodigy 20 points

Thank you for your reply.

It was very clear. I understand.

I will try to use both ports.

## BTW, L1 and L2 of the EVM which I bought are populated since I bought it.

Thank you very much.

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TPA3111D1EVM: The difference of two output ports