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LX1725 15W X 2 30W BTL class-D audio amplifier

Posted: 11 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:class-D audio amplifier? pulse width modulation amp? filters?

Class-D audio amplifiers basically are pulse width modulation (PWM) amplifiers; these types of amplifier require low pass filtering of the output to demodulate the PWM carrier. Some applications also utilize the filter as a way to achieve an impedance transformation that draws less power supply current than is delivered to the load. These filters can be as simple as a single inductor; to multiple LC nodes depending on the application.

In some applications the load will have enough inductance to act as its own filter called filter less configuration which uses the speaker?s own inductance as a low pass filter. PWM filters are normally a low pass configuration, many different types of low pass filters exist. The Butterworth filter (flat response in the pass band and good roll off beyond the cutoff frequency) is the most common filter used in class-D amplifier applications.

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