Texas Instruments TMS570LC4357

CTR=zero
CTR=CMPB
X
En
SyncOut
Phase reg
Ext SyncIn
(optional)
EPWM1A
EPWM1B
SyncOut
Phase reg
CTR=CMPB
CTR=zero
X
En
EPWM2B
EPWM2A
Slave
Master
SyncIn
SyncIn
1
2
Φ=0°
Φ=120°
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2068
SPNU563A–March 2018
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Enhanced Pulse Width Modulator (ePWM) Module
35.3.7 Practical Applications Using Phase Control Between PWM Modules
So far, none of the examples have made use of the phase register (TBPHS). It has either been set to zero
or its value has been a don't care. However, by programming appropriate values into TBPHS, multiple
PWM modules can address another class of applications that rely on phase relationship between stages
for correct operation. As described in the TB module section, a PWM module can be configured to allow a
SyncIn pulse to cause the TBPHS register to be loaded into the TBCTR register. To illustrate this concept,
Figure 35-61 shows a master and slave module with a phase relationship of 120°, i.e., the slave leads the
master.
Figure 35-61. Configuring Two PWM Modules for Phase Control