UCD3138ARMHT datasheet(35/83 Pages) TI

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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

Adaptive Sample Trigger A

UCD3138A

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SLUSC66B – MARCH 2015 – REVISED MAY 2015

6.5.5

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. The diagram of the Leading

Edge Mode is shown in Figure 6-5.

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.

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 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

Figure 6-5. Leading Edge Closed Loop

Detailed Description

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