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.

FB

What's the state of the art in terms of Class D (or other PWM
architecture) audio amps in this power range?

Perhaps you could give up the idea of trying to clean up the supply for
a linear amp and really save yourself some power.

--
Paul Hovnanian paul@xxxxxxxxxxxxx
-----------------------------------------------------------------------
Have gnu, will travel.
.

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