AVERAGE CURRENT-MODE FEEDBACK CONTROL OF MULTI-CHANNEL CLASS-D AUDIO AMPLIFIER

摘要

Described herein are several configurations of Class-D audio amplifiers, including a single-ended and a bridge-tied load (BTL) configuration, in which voltage-mode control and average current-mode control circuitry in feedback loops can be included to control the outputs of the Class-D amplifier to reduce open-loop errors and maintain a relatively high loop gain over an expected audio frequency range. The average current-mode control circuitry monitors current through a resistor common to both a current flow into a positive terminal of a loudspeaker associated with the amplifier and a current flow into a negative terminal of the loudspeaker. The voltage-mode control circuitry works with the average current-mode control circuitry in controlling the output of the Class-D audio amplifier.

主权项

1. A class-D audio amplifier, comprising:
current-mode control circuitry in a feedback loop adapted to control an output voltage of the audio amplifier, wherein
the current-mode control circuitry monitors current though a common resistor common to both a current flow into a positive terminal of a loudspeaker and a current flow into a negative terminal of the loudspeaker to control the output.