OUTP

OUTN

OUTP

Speaker

Current

OUTP

OUTN

OUTP

Speaker

Current

OUTP

OUTN

OUTP

Speaker

Current

0 V

0 V

PVCC

No Output

Positive Output

Negative Output

0 A

0 A

0 V

TPA3116D2

TPA3118D2

TPA3130D2

www.ti.com

SLOS708B – APRIL 2012 – REVISED MAY 2012

MODSEL = HIGH: 1SPW-modulation

The 1SPW mode alters the normal modulation scheme in order to achieve higher efficiency with a slight penalty

in THD degradation and more attention required in the output filter selection. In 1SPW mode the outputs operate

at ~15% modulation during idle conditions. When an audio signal is applied one output will decrease and one will

increase. The decreasing output signal will quickly rail to GND at which point all the audio modulation takes place

through the rising output. The result is that only one output is switching during a majority of the audio cycle.

Efficiency is improved in this mode due to the reduction of switching losses. The THD penalty in 1SPW mode is

minimized by the high performance feedback loop. The resulting audio signal at each half output has a

discontinuity each time the output rails to GND. This can cause ringing in the audio reconstruction filter unless

care is taken in the selection of the filter components and type of filter used.

Figure 32. 1SPW Mode Modulation

Copyright © 2012, Texas Instruments Incorporated

Submit Documentation Feedback

21

Product Folder Link(s): TPA3116D2 TPA3118D2 TPA3130D2