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%.
|Title of host publication||AES 27th Conference "Efficient Audio Power Amplification"|
|Number of pages||7|
|Publication status||Published - 2005|
|Event||AES 27th Conference "Efficient Audio Power Amplification" - |
Duration: 1 Jan 2005 → …
|Conference||AES 27th Conference "Efficient Audio Power Amplification"|
|Period||01/01/2005 → …|