Power Solutions for Class-D Audio Amplifiers
Today, the most popular medium and high power audio amplifiers employ a Class-D working scheme due to high efficiency and excellent linearity. Compared to traditional analog amplifiers, Class-D uses high frequency pulse width modulation, similar to a switch mode power supply. Even though Class-D amplifiers incorporate negative feedback on supply voltage, the reality is that the output impedance of the power supply has an impact on audio quality. This topic describes how to properly design a power supply for a high power Class-D amplifier based on the output impedance requirements as well as on typical requirements like average and peak power demands. Two different built and tested power reference designs are introduced. The first is for a universal AC/DC input suitable for home theater, monitor and soundbar applications. The second solution covers high power automotive applications rated to several hundred watts.
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