Direct energy conversion audio power amplifier represents total integration of switching-mode power supply and Class D audio power amplifier into one compact stage, achieving high efficiency, high level of integration, low component count and eventually low cost. This paper presents how self-oscillating modulators can be used with the direct switching-mode audio power amplifier to improve its performance by providing fast hysteretic control with high power supply rejection ratio, open-loop stability and high bandwidth. Its operation is thoroughly analyzed and experimental results from prototype amplifier are presented.

Authors: Andersen, Michael A. E.; Ljusev, Petar
Affiliation: Technical University of Denmark
AES Conference: 27th International Conference: Efficient Audio Power Amplification (September 2005)
Paper Number: 2-3
Publication Date: September 1, 2005
Subject: Efficient Audio Power Amplification

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