UCD3138 datasheet(36/68 Pages) TI1

36 / 68 page

Start of Period

Period Counter

Start of Period

Filter Period

Adaptive Sample Trigger A

Sample Trigger 1

DPWM Output A

Filter Duty – Average Dead Time

Event 1

Event 3 - Event 2

Period Register – Event 4

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

Resonant Symmetrical Closed Loop

Events which change with DPWM mode:

Dead Time 1 = Event 3 – Event 2

Dead Time 2 = Event 1 + Period Register – Event 4)

Average Dead Time = (Dead Time 1 + Dead Time 2)/2

DPWM A Rising Edge = Event 1

DPWM A Falling Edge = Event 1 + Filter Duty – Average Dead Time

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

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

DPWM B Rising Edge = Event 1 + Filter Duty – Average Dead Time + (Event 3 – Event 2)

DPWM B Falling Edge = Filter Period – (Period Register – 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

Adaptive Sample Trigger B

UCD3138

SLUSAP2 A – MARCH 2012 – REVISED MARCH 2012

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4.8

DPWM Resonant Mode

This mode provides a symmetrical waveform where DPWMA and DPWMB have the same pulse width. As

the switching frequency changes, the dead times between the pulses remain the same.

The equations for this mode are designed for a smooth transition from PWM mode to resonant mode, as

described in the LLC Example section. Here is a diagram of this mode:

Functional Overview

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