UCD3138128PFC datasheet(46/80 Pages) TI

tên linh kiện	UCD3138128PFC

Giải thích chi tiết về linh kiện	UCD3138x Highly-Integrated Digital Controller For Isolated Power

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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

UCD3138128, UCD3138A64

SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014

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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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UCD3138128PFC bảng dữ liệu(PDF) 46 Page - Texas Instruments