Derivation and Analysis of a Low-Cost, High-performance Analogue BPCM Control Scheme for Class-D Audio Power Amplifiers

Mikkel Christian Wendelboe Høyerby, Michael A. E. Andersen

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Abstract

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/8Ω single-ended switching amplifier with THD+N of typically 0.02%.
Original languageEnglish
Title of host publicationAES 27th Conference "Efficient Audio Power Amplification"
Number of pages7
Publication date2005
Publication statusPublished - 2005
EventAES 27th Conference "Efficient Audio Power Amplification" -
Duration: 1 Jan 2005 → …

Conference

ConferenceAES 27th Conference "Efficient Audio Power Amplification"
Period01/01/2005 → …

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