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2.4
DPWM Phase Shift Mode
In most modes, it is possible to synchronize multiple DPWM modules using the phase shift signal. The
phase shift signal has two possible sources. It can come from the Phase Shift Register or from the Filter
Duty value.
The Phase Shift Register provides a fixed value, which is useful in simple multiphase systems such as
interleaved PFC.
When the Filter Duty is the source, the changes in the filter output cause changes in the phase
relationship of two DPWM modules. This is useful for phase shifted full bridge topologies if voltage mode
control is desired rather than peak current mode.
Figure 2-5
shows the mechanism of phase shift:
Period Counter
DPWM0 Output A
DPWM0 Output B
DPWM0 Phase Trigger
Period Counter
DPWM1 Output A
DPWM1 Output B
DPWM1 Phase Trigger
Phase Trigger = Phase Trigger Register value or Filter Duty
SNIU028A – February 2016 – Revised April 2016
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Phase Shift
DPWM0 Start of Period
Period
DPWM1 Start of Period
Period
Figure 2-5. DPWM - Phase Shift Mode
Copyright © 2016, Texas Instruments Incorporated
DPWM0 Start of Period
DPWM1 Start of Period
Digital Pulse Width Modulator (DPWM)
DPWM Phase Shift Mode
41
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