UCD3138128APFC datasheet(57/83 Pages) TI1

Part #	UCD3138128APFC

Description	UCD3138128A Highly-Integrated Digital Controller For Isolated Power

PDF	83 Pages

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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57 / 83 page

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

UCD3138128A

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SLUSC99 – JULY 2016

Product Folder Links: UCD3138128A

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Device Functional Modes (continued)

9.4.1.6 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 40. Phase Shifting

UCD3138128APFC Datasheet(PDF) 57 Page - Texas Instruments