UCD3138064A datasheet(54/84 Pages) TI2

54 / 84 page

Start of Period

Period Counter

Start of Period

Filter Period

DPWM Output A

DTC Adjustment

Filter Duty – 2 x Event 1

Event 1

2 x Event 1

DTC Adjustment

Event 1

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 B

Adaptive Sample Trigger A

UCD3138064A

SLUSCA5B – DECEMBER 2015 – REVISED JANUARY 2017

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Detailed Description

Events which change with DPWM mode:

DPWM A Rising Edge = Event 1

DPWM A Falling Edge = Filter Duty – Event 1 + 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 = Filter Duty + Event 1

DPWM B Falling Edge = Filter Period – Event 1 + 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 6-29. DPWM Resonant Symmetrical Mode

The Filter has two outputs, Filter Duty and Filter Period. In this case, the Filter is configured so that the

Filter Period is twice the Filter Duty. So if there were no dead times, each DPWM pin would be on for half

of the period. For dead time handling, the average of the two dead times is subtracted from the Filter Duty

for both DPWM pins. Therefore, both pins will have the same on-time, and the dead times will be fixed

regardless of the period. The only edge which is fixed relative to the start of the period is the rising edge of

DPWM A. This is the only edge for which the blanking signals can be used easily.

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