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0 V

–12 V

+12 V

Current

OUTP

Differential Voltage

Across Load

OUTN

TPA3007D1 MODULATION SCHEME

TPA3007D1

SLOS418A – SEPTEMBER 2003 – REVISED DECEMBER 2004

APPLICATION INFORMATION (continued)

Figure 14. Traditional Class-D Modulation Scheme's Output Voltage and Current Waveforms Into an

Inductive Load With No Input

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

Figure 15).

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