DRV595 Datasheet, PDF (16/24 Pages) Texas Instruments – 15V/±3A High-Efficiency PWM Power Driver

DRV595
SLOS808 – DECEMBER 2012
www.ti.com
MODSEL = HIGH: 1SPW-modulation
The 1SPW mode alters the normal modulation scheme in order to achieve higher efficiency with a slight penalty
in ripple current and more attention required in the output filter selection. In 1SPW mode the outputs operate at
~15% modulation during idle conditions. When an input signal is applied one output decreases and one
increases. The decreasing output signal quickly rails to GND at which point all the modulation takes place
through the rising output. The result is that often only one output is switching. Efficiency is improved in this mode
due to the reduction of switching losses. The resulting output signal at each half output has a discontinuity each
time the output rails to GND. This can cause ringing in the output filter unless care is taken in the selection of the
filter components and type of filter used.
OUTP
OUTP–OUTN
OUTN
0V
Load Current
No Output
OUTP
OUTP–OUTN
OUTN
PVCC
0V
Load Current
0A
Positive Output
OUTP
OUTN
OUTP–OUTN
0V
–PVCC
0A
Load Current
Figure 17. 1SPW Mode Modulation
Negative Output
16
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