TPA3001D1_15 Datasheet, PDF (15/30 Pages) Texas Instruments – 20-W MONO CLASS-D AUDIO POWER AMPLIFIER

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TPA3001D1
SLOS398E – DECEMBER 2002 – REVISED AUGUST 2010
OUTP
OUTN
+12 V
Differential Voltage
Across Load ^{0 V}
–12 V
Current
Figure 31. Traditional Class-D Modulation Scheme's Output Voltage and Current Waveforms Into an
Inductive Load With No Input
TPA3001D1 MODULATION SCHEME
The TPA3001D1 uses a modulation scheme that still has each output switching from ground to V_CC. However,
OUTP and OUTN are now in phase with each other with no input. The duty cycle of OUTP is greater than 50%
and OUTN is less than 50% for positive output voltages. The duty cycle of OUTP is less than 50% and OUTN is
greater than 50% for negative output voltages. The voltage across the load is 0 V throughout most of the
switching period, greatly reducing the switching current, which reduces any I²R losses in the load. (See
Figure 32.)
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Product Folder Link(s): TPA3001D1
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