TAS2505-Q1: TAS2502-Q1 Drive speaker output question

yang yanliang

Part Number: TAS2505-Q1
Other Parts Discussed in Thread: TAS2505

Hello, TI team,

TAS2505 is a class D power amplifier. I understand that SPKP/M is output by square wave.

In the figure, it is directly connected to the Speaker,

my question is:

1. Why don't you add LC in the middle and convert it into sine wave signal to drive the speaker?

2.For square waves, how does the Speaker match the power of TAS2505?

0 Ivan Salazar over 4 years ago

Hi Yang,

Let me add some comments below:

LC filter can be included, as you mention it would take signal into sine-like wave based on the input signal. No problem with this. Use of filter, either LC or ferrite+capacitor depends on the application emission requirements and constraints.
The speaker acts like a natural low-pass filter, for distortion measurements the filter would be required but power is not affected. The attached document may give some idea of how these Class-D amplifiers work.

Hope this information is useful. If any additional questions, please let me know.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 yang yanliang over 4 years ago in reply to Ivan Salazar

Thanks for your reply.

Is there any problem if SPKM/SPKP directly connects to the Speaker?

Will there be a noise problem?

+1 Ivan Salazar over 4 years ago in reply to yang yanliang

Hi Yang,

No problems when connecting speaker directly without filter.
Filter is required only for emission constraints, not required for audio quality.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

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