Class D Audio Amplifiers: What, Why, and How | Analog Devices
For an audio amplifier with 10-W PLOAD max, an average PLOAD of 1 W can be considered a realistic listening level. Under this condition, 282 mW is dissipated inside the Class D output stage, vs. W for Class B and W for Class A. In this case, the Class D efficiency is reduced to 78%—from 90% at higher power.
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