This paper presents a low-cost analogue control scheme for class-D audio power amplifiers. The scheme is based around bandpass current-mode (BPCM) control, and provides ample stability margins and low distortion over a wide range of operating conditions. Implementation is very simple and does not require the use of operational amplifiers. Small-signal behavior of the controller is accurately predicted, and design is carried out using standard transfer function based linear control methodology. Effectiveness of the approach is demonstrated via a 60W/8W single-ended switching amplifier with THD+N of typically 0.02%.

Authors: Andersen, Michael A. E.; Høyerby, Mikkel C. W.
Affiliation: Technical University of Denmark
AES Conference: 27th International Conference: Efficient Audio Power Amplification (September 2005)
Paper Number: 3-4
Publication Date: September 1, 2005
Subject: Efficient Audio Power Amplification

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