LM48310: LM48310- Spread Spectrum Mode

Riya VN

Part Number: LM48310

Hi,

I am using LM48310 in my design which would drive a speaker. The speaker will be placed close to the amplifier on the board. Should I use an LC filter or ferrite bead at the output of the amplifier for obtaining a good quality audio signal?

over 7 years ago

0 José Luis over 7 years ago

TI__Mastermind 20085 points

Hi Riya

Welcome to E2E, thanks for your interest in our products.
The LC filter should be used if the design is failing radiated emissions. The LC filter reduce the electromagnetic radiation (EMI).

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 Riya VN over 7 years ago in reply to José Luis

Prodigy 80 points

Hi Figueroa,

Thanks for the reply. Presently I am not doing any radiated emission test as I am in the design phase. I would like to avoid using LC filter due to space constraint. To be more specific I would use an 8 ohm speaker and the distance between the amplifier and speaker would not be more than 2 cm. Under this condition would there be a requirement of LC filter? If you still suggest an LC filter, I would appreciate some details on the LC circuit, like recommended L,C values. Also for what modulation - AD or BD ?

Regards,

Riya

0 José Luis over 7 years ago in reply to Riya VN

TI__Mastermind 20085 points

Hi Riya,

Most of TI's Class-D amplifiers operate without a filter when speaker wires are less than 10 cm, therefore you don't need to add LC filter in your application.

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 Riya VN over 7 years ago in reply to José Luis

Prodigy 80 points

Thanks!!

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LM48310: LM48310- Spread Spectrum Mode