UCD3138RMHT datasheet(37/78 Pages) TI1

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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

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SLUSAP2F – MARCH 2012 – REVISED NOVEMBER 2013

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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