UCD3138128APFC datasheet(55/83 Pages) TI1

55 / 83 page

Start of Period

Period Counter

Start of Period

Period

Sample Trigger 1

DPWM Output A

Filter Duty/2 (High Resolution)

Period/2

DPWM Output B

Blanking A Begin

Blanking A End

Blanking B Begin

Blanking B End

Phase Trigger

Sample Trigger 2

To Other

Modules

To Other

Modules

Filter controlled edge

Cycle Adjust A (High Resolution)

Cycle Adjust B (High Resolution)

UCD3138128A

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SLUSC99 – JULY 2016

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Device Functional Modes (continued)

9.4.1.4 Triangular Mode

Triangular mode provides a stable phase shift in interleaved PFC and similar topologies. In this case, the PWM

pulse is centered in the middle of the period, rather than starting at one end or the other. In Triangular Mode,

only DPWM-B is available. The diagram for Triangular Mode is shown in Figure 38.

All edges are dynamic in triangular mode, so fixed blanking is not that useful. The adaptive sample trigger is not

needed. It is very easy to put a fixed sample trigger exactly in the center of the FET on-time, because the center

of the on-time does not move in this mode.

Events which change with DPWM mode:

•

DPWM A Rising Edge = None

•

DPWM A Falling Edge = None

•

Adaptive Sample Trigger = None

•

DPWM B Rising Edge = Period / 2 - Filter Duty / 2 + Cycle Adjust A

•

DPWM B Falling Edge = Period / 2 + Filter Duty / 2 + Cycle Adjust B

•

Phase Trigger = Phase Trigger Register value or Filter Duty

Events always set by their registers, regardless of mode:

•

Sample Trigger 1, Sample Trigger 2, Blanking A Begin, Blanking A End, Blanking B

•

Begin, Blanking B End

Figure 38. Triangular Mode Closed Loop

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