Designing Practical High Performance Class D Audio Amplifier
Designing Practical High Performance Class D Audio Amplifier
Designing Practical High Performance Class D Audio Amplifier
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Review: Traditional <strong>Class</strong> AB <strong>Amplifier</strong><br />
Feed back<br />
+Vcc<br />
• <strong>Class</strong> AB amplifier uses<br />
linear regulating transistors<br />
to modulate output voltage.<br />
+<br />
-<br />
Error amp<br />
+<br />
Bias<br />
-Vcc<br />
η = 30% at temp rise test condition.<br />
• A loss in the regulating<br />
transistor in <strong>Class</strong> AB<br />
amplifier is proportional to<br />
the product of the voltage<br />
across the device and the<br />
current flowing through it.<br />
P<br />
C<br />
= V<br />
CE<br />
⋅ I<br />
C<br />
Independent of device<br />
parameter<br />
www.irf.com
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