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 language | English |
|---|---|
| Title of host publication | AES 27th Conference "Efficient Audio Power Amplification" |
| Number of pages | 7 |
| Publication date | 2005 |
| Publication status | Published - 2005 |
| Event | AES 27th Conference "Efficient Audio Power Amplification" - Hillerød, Denmark Duration: 2 Sept 2005 → 4 Sept 2005 |
Conference
| Conference | AES 27th Conference "Efficient Audio Power Amplification" |
|---|---|
| Country/Territory | Denmark |
| City | Hillerød |
| Period | 02/09/2005 → 04/09/2005 |