UCD3138ARMHT datasheet(34/83 Pages) TI

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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)

UCD3138A

SLUSC66B – MARCH 2015 – REVISED MAY 2015

www.ti.com

6.5.4

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 6-4.

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 6-4. Triangular Mode Closed Loop

Detailed Description

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