Configuring Two Pwm Modules For Phase Control - Texas Instruments Concerto F28M35 Series Technical Reference Manual

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7.3.7 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 power topologies that rely on phase relationship between

legs (or 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,

i.e., the slave leads the master.

Figure 7-65. Configuring Two PWM Modules for Phase Control

shows the associated timing waveforms for this configuration. Here, TBPRD = 600 for both

master and slave. For the slave, TBPHS = 200 (i.e., 200/600 X 360° = 120°). Whenever the master

generates a SyncIn pulse (CTR = PRD), the value of TBPHS = 200 is loaded into the slave TBCTR

SPRUH22I – April 2012 – Revised November 2019

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shows a master and slave module with a phase relationship of 120°,

C28 Enhanced Pulse Width Modulator (ePWM) Module

Applications to Power Topologies

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