UCD3138A datasheet(32/83 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

To Other

Modules

Filter controlled edge

Event 3 (High Resolution)

Cycle Adjust B (High Resolution)

Filter Duty (High Resolution)

DPWM Output B

Blanking B Begin

Blanking B End

Phase Trigger

Sample Trigger 2

To Other

Modules

Sample Trigger 1

Blanking A Begin

Blanking A End

DTC Adjustment

Adaptive Sample Trigger B

Adaptive Sample Trigger A

UCD3138A

SLUSC66B – MARCH 2015 – REVISED MAY 2015

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6.5.2

DPWM Multiple Output Mode

Multi mode is used for systems where each phase has only one driver signal. It enables each DPWM

peripheral to drive two phases with the same pulse width, but with a time offset between the phases, and

with different cycle adjusts for each phase.

The diagram for Multi-Mode is shown in Figure 6-2.

Event 2 and Event 4 are not relevant in Multi mode.

DPWMB can cross over the period boundary safely, and still have the proper pulse width, so full 100%

pulse width operation is possible. DPWMA cannot cross over the period boundary.

Since the rising edge on DPWM B is also fixed, Blanking B-Begin and Blanking B-End can be used for

blanking this rising edge.

Cycle Adjust B is usable on DPWM B.

Events which change with DPWM mode:

•

DPWM A Rising Edge = Event 1

•

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

•

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 3

•

DPWM B Falling Edge = Event 3 + Filter Duty + Cycle Adjust B + 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 6-2. Multi Mode Closed Loop

Detailed Description

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