Datasheet

CTR=zero

CTR=CMPB

SyncOut

Phase reg

Ext SyncIn

(optional)

EPWM1A

EPWM1B

SyncOut

Phase reg

CTR=CMPB

CTR=zero

EPWM2B

EPWM2A

Slave

Master

SyncIn

Φ=0°

Φ=120°

www.ti.com

Application Examples

34.3.7 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 34-61 shows a master and slave module with a phase relationship of 120° , i.e., the slave leads the

master.

Figure 34-61. Configuring Two PWM Modules for Phase Control

1785

SPNU562–May 2014 Enhanced Pulse Width Modulator (ePWM) Module

Submit Documentation Feedback