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A $2 \times 70$ W from 24 V into 4 $\Omega $ class-D audio power amplifier in 30/40 V 180 nm bipolar CMOS DMOS is presented. The device employs a flying capacitor (FC) three-level half bridge topology to reduce switching frequency and filter/load power losses in near-idle operation. This is combined with a fourth-order analog feedback system for shaping noise introduced by the digital FC voltage...
The consumer electronics trends of miniaturization and portability have been pushing the integrated Class-D audio power amplifier (PA) market for a number of years. This creates opportunities for new players in the market, through reduction of output LC filter size and reduction of power losses. In battery-powered applications, near-idle power loss is of particular interest, since the audio PA will...
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