Dpwm - Resonant Mode - Texas Instruments UCD3138 Technical Reference Manual

DPWM Resonant Mode
Filter Duty – Average Dead Time
Adaptive Sample Trigger A
Adaptive Sample Trigger B
To Other
Modules
Period Register – Event 4
To Other
Modules
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
44
Digital Pulse Width Modulator (DPWM)
Resonant Symmetrical Closed Loop
Start of Period
Filter Period
Period Counter
DPWM Output A
Event 1
Sample Trigger 1
Blanking A Begin
Blanking A End
DPWM Output B
Event 3 - Event 2
Sample Trigger 2
Blanking B Begin
Blanking B End
Phase Trigger
Figure 2-7. DPWM – Resonant Mode
Copyright © 2016, Texas Instruments Incorporated
Start of Period
Filter controlled edge
SNIU028A – February 2016 – Revised April 2016
www.ti.com
Submit Documentation Feedback