UCD3138 datasheet(55/99 Pages) TI2

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9.6.6 Leading Edge Mode

Leading edge mode is very similar to Normal mode, reversed in time. The DPWM A falling edge is fixed, and

the rising edge moves to the left, or backwards in time, as the filter output increases. The DPWM B falling edge

stays ahead of the DPWMA rising edge by a fixed dead time. Here is a diagram of the Leading Edge Mode:

Start of Period

Period Counter

Start of Period

Period

Adaptive Sample Trigger B

Sample Trigger 1

DPWM Output A

Cycle Adjust A (High Resolution)

Filter Duty (High Resolution)

Event 1

Event 2 - Event 3 (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

Leading Edge Closed Loop

Events which change with DPWM mode:

DPWM A Falling Edge = Event 1

DPWM A Rising 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 4

DPWM B Falling Edge = Event 1 - Filter Duty + Cycle Adjust A -(Event 2 – Event 3)

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

Adaptive Sample Trigger A

Figure 9-22. Leading Edge Closed Loop

As in the Normal mode, the two edges in the middle of the period are dynamic, so the fixed blanking intervals are

mainly useful for the edges at the beginning and end of the period.

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UCD3138

SLUSAP2J – MARCH 2012 – REVISED NOVEMBER 2021

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