UCD3138ARGCT datasheet(31/83 Pages) TI

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Start of Period

Period Counter

Start of Period

Period

DPWM Output A

Cycle Adjust A (High Resolution)

Filter Duty (High Resolution)

Event 1

Event 3 ± Event 2 (High Res)

Event 4 (High Res)

DPWM Output B

Blanking B Begin

Blanking B End

Phase Trigger

Sample Trigger 2

To Other

Modules

Filter controlled edge

Sample Trigger 1

Blanking A Begin

Blanking A End

To Other

Modules

Adaptive Sample Trigger A

Adaptive Sample Trigger B

DTC Adjustment

UCD3138A

www.ti.com

SLUSC66B – MARCH 2015 – REVISED MAY 2015

Events which change with DPWM mode:

•

DPWM A Rising Edge = Event 1

•

DPWM A Falling Edge = Event 1 + Filter Duty + Cycle Adjust A

•

Adaptive Sample Trigger A = Event 1 + Filter Duty + Adaptive Sample Register or

•

Adaptive Sample Trigger B = Event 1 + Filter Duty/2 + Adaptive Sample Register

•

DPWM B Rising Edge = Event 1 + Filter Duty + Cycle Adjust A + (Event 3 – Event 2)

•

DPWM B Falling Edge = Event 4 + DTC Adjustment

•

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 6-1. Normal Mode Closed Loop

Detailed Description

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