LC Filter Design (Rev. A) - Texas Instruments
allow for four channels with a single stereo BTL amplifier as shown in Figure 3. Some amplifiers also allow a combination of 1× BTL and 2× SE channels for support of 2.1 audio systems with a single device. Due to the PWM modulation of a class-D amplifier, a DC voltage of PVDD / 2 or half of the supply voltage is present after the LC filter.
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