Average current-mode feedback control of multi-channel class-D audio amplifier
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United States of America Patent
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Oct 31, 2017
Grant Date -
Dec 22, 2016
app pub date -
Jun 17, 2016
filing date -
Jun 18, 2015
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Abstract
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.
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