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THE ADVANTAGE OF THE CLASS D TECHNIQUE
The advantage of the class D technique is that the circuit is more efficient and less power is wasted. In a class AB amplifier, in the condition of maximum dissipation often used for thermal dimensioning, the efficiency is only 50%, so as much power is wasted as is delivered to the speaker.
In a class D equivalent the efficiency is around 90% so only 10% of the power is wasted as heat. Apart from the saving in energy, the benefit of this higher efficiency is that less heat is generated inside the amplifier, so bulky power packages and heatsinks can be eliminated.
 
 
 
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