UCD3138RHAT datasheet(30/78 Pages) TI1

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Start of Period

Period Counter

Start of Period

Period

Sample Trigger 1

DPWM Output A

Cycle Adjust A (High Resolution)

Event 2 (High Resolution)

Event 1

Event 3 (High Resolution)

Cycle Adjust B (High Resolution)

Event 4 (High Resolution)

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

Multi Mode Open Loop

Events which change with DPWM mode:

DPWM A Rising Edge = Event 1

DPWM A Falling Edge = Event 2 + Cycle Adjust A

DPWM B Rising Edge = Event 3

DPWM B Falling Edge = Event 4 + Cycle Adjust B

Phase Trigger = Phase Trigger Register value

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

UCD3138

SLUSAP2F – MARCH 2012 – REVISED NOVEMBER 2013

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Basic comparisons between the programmed registers and the DPWM counter can create the desired

edge placements in the DPWM. High resolution edge capability is available on Events 2, 3 and 4.

The drawing above is for multi-mode, open loop. Open loop means that the DPWM is controlled entirely

by its own registers, not by the filter output. In other words, the power supply control loop is not closed.

Functional Overview

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