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UCD3138128 Datasheet(PDF) 48 Page - Texas Instruments

Part # UCD3138128
Description  UCD3138128, UCD3138A64 Highly-Integrated Digital Controller For Isolated Power
PDF  84 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

UCD3138128 Datasheet(HTML) 48 Page - Texas Instruments

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Phase Shift
Phase Trigger = Phase Trigger Register value or Filter Duty
DPWM0 Start of Period
Period Counter
DPWM0 Start of Period
DPWM1 Start of Period
Period Counter
DPWM1 Start of Period
48
UCD3138128, UCD3138A64
SLUSBZ8B – JUNE 2014 – REVISED FEBRUARY 2017
www.ti.com
Product Folder Links: UCD3138128 UCD3138A64
Submit Documentation Feedback
Copyright © 2014–2017, Texas Instruments Incorporated
Device Functional Modes (continued)
Cycle Adjust B has no effect in Normal Mode.
9.4.1.2 Phase Shifting
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 Trigger Register. This provides a fixed value,
which is useful for an application like interleaved PFC.
The phase shift value can also come from the filter output. In this case, the changes in the filter output causes
changes in the phase relationship of two DPWM modules. This is useful for phase shifted full bridge topologies.
The following figure shows the mechanism of phase shift:
Figure 30. Phase Shifting



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