Abstract
A 2 × 70 W from 24 V into 4 Ω class-D audio power amplifier in 30/40 V 180 nm bipolar CMOS DMOS is presented. The device employs a flying capacitor (FC) three-level half bridge topology to reduce switching frequency and filter/load power losses in near-idle operation. This is combined with a fourth-order analog feedback system for shaping noise introduced by the digital FC voltage control loop. A power-efficient gate drive scheme suitable for power converters with multiple floating switching devices is also presented, including a compact fast low-power dV/dt robust high-voltage level shifter circuit. Power-efficient operation from idle to full-power operation is demonstrated along with a very high audio performance of 0.003% THD + N at 10 W/1 kHz into 4 Ω.
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