Driving a 50W speaker with a 25W Amplifier

Hi Neil Albaugh,

             Thanks for the reply, let me put the question in this way, how can i make a 25W amplifier capable of driving a 50W speaker i.e., i want to increase the power drive capability of amplifier from 25W to 50W (may be by adding some external circuitry, what would that be), actually i selected an IC (tentatively) whose rating is 25W, so i wanted to know whether using the same IC with some additional circuitry or some techniques, whether i would be able to drive a 50W speaker to its peak power.

             Alternately, if the aforesaid is not possible can you suggest some Amplifier IC with I2S interface and 50W max  power ooutput.

Thank you very much.

Hi BhavaniSingh,

There are ways of increasing the output power of an amplifier by using discretes, however there are a number of integrated IC solutions that make life easier.

The Overture Series of integrated power ICs (LM2876, LM3875, LM3876, and LM3886) address many power levels, have very good performance specifications and are very well protected. These are truely plug-n-play type devices.

Additionally, instead of using discretes these integrated devices can be configured in different topologies to obtain higher power levels while maintaining the plug-n-play concept, especially if you already have a specific power supply. I would refer to TI Literature #: SNAA021A {LM3886 Application Note 1192}.

If there is a desire to implement a design using discretes, then I would suggest looking into a driver type circuit; the LM391, LM4702, LME49810 or LME49830.

The Application Note 272 (Literature #: SNOA600A) is a good document showing discrete designs using op amps.

I hope this helps.

Best Regards,

Hi John De Celles,

                                   Thanks for the reply, it was very insightful, and thanks for the solutions, i will look into the solutions.

Thanks and Regards.