UCD3138A64 datasheet(45/80 Pages) TI

45 / 80 page

Start of Period

Period Counter

Start of Period

Period

DPWM Output A

Cycle Adjust A (High Resolution)

Filter Duty (High Resolution)

Event 1

Event 3 – Event 2 (High Res)

Event 4 (High Res)

DPWM Output B

Blanking B Begin

Blanking B End

Phase Trigger

Sample Trigger 2

To Other

Modules

Normal Mode Closed Loop

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 1 + Filter Duty + Cycle Adjust A + (Event 3 – Event 2)

DPWM B Falling Edge = 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

Sample Trigger 1

Blanking A Begin

Blanking A End

To Other

Modules

Adaptive Sample Trigger A

Adaptive Sample Trigger B

UCD3138128, UCD3138A64

www.ti.com

SLUSBZ8A – JUNE 2014 – REVISED SEPTEMBER 2014

Device Functional Modes (continued)

Figure 29. Normal Mode - Closed Loop

Cycle adjust A can be used to adjust pulse widths on individual phases of a multi-phase system. This can be

used for functions like current balancing. The Adaptive Sample Triggers can be used to sample in the middle of

the on-time (for an average output), or at the end of the on-time (to minimize phase delay) The Adaptive Sample

MOSFET and gate driver turn on times.

Blanking A-Begin and Blanking A-End can be used to blank out noise from the MOSFET turn on at the beginning

of the period (DPWMA rising edge). Blanking B could be used at the turn off time of DPWMB. The other edges

are dynamic, so blanking is more difficult.

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