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THE
ADVANTAGE OF THE CLASS D TECHNIQUE |
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| 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. |
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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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