Datasheet

0 V
–12 V
+12 V
Current
OUTP
Differential Voltage
Across Load
OUTN
TPA3001D1
www.ti.com SLOS398E –DECEMBER 2002–REVISED AUGUST 2010
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 I
2
R losses in the load. (See
Figure 32.)
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