Re: Switching Regulator for Audio Amplifier

Fred wrote:
I have an audio amp based on the LM3886. In order to get 50W out of
it I need to use a transformer who voltage rises too high for the
LM3886 to tolerate during no or light load times.

I have modeled a linear regulator for the amp, but is is very
wasteful, it dissipates over a hundred watts a channel. I had to
parallel four regulators on each rail in order to keep their
individual dissipations manageable.

I have started considering a switched mode power supply, and have been
looking at chips such as the LM5116. Some time ago, I heard using
SMPSs in audio amplifers in problematic because of the difficulty in
filtering out the switching noise from the output.

Any suggestions would be appreciated.

Reevaluate your requirement for a 50 watt amplifier. You would be hard pressed to hear the difference between a 50 watt amplifier and a 40 watt one.

--
Regards,

John Popelish
.

Relevant Pages

  • Re: Switching Regulator for Audio Amplifier
    ... LM3886 to tolerate during no or light load times. ... I have modeled a linear regulator for the amp, ... I have started considering a switched mode power supply, ... Reevaluate your requirement for a 50 watt amplifier. ...
    (sci.electronics.design)
  • Switching Regulator for Audio Amplifier
    ... I have an audio amp based on the LM3886. ... LM3886 to tolerate during no or light load times. ... I have modeled a linear regulator for the amp, ... I have started considering a switched mode power supply, ...
    (sci.electronics.design)