UCD3138RMHT datasheet(33/78 Pages) TI1

33 / 78 page

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

Normal Mode Closed Loop

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

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

Filter controlled edge

Sample Trigger 1

Blanking A Begin

Blanking A End

To Other

Modules

Adaptive Sample Trigger A

Adaptive Sample Trigger B

UCD3138

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SLUSAP2F – MARCH 2012 – REVISED NOVEMBER 2013

Cycle adjust A can be used to adjust pulse widths on individual phases of a multi-phase system. This can

be used for functions like current balancing. The Adaptive Sample Triggers can be used to sample in the

middle of the on-time (for an average output), or at the end of the on-time (to minimize phase delay) The

Adaptive Sample Register provides an offset from the center of the on-time. This can compensate for

external delays, such as MOSFET and gate driver turn on times.

Functional Overview

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