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Original
(outA)
Rising Edge
Delayed (RED)
Falling Edge
Delayed (FED)
Active High
Complementary
(AHC)
Active Low
Complementary
(ALC)
Active High
(AH)
Active Low
(AL)
RED
FED
Period
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ePWM Submodules
•
Mode 6: Bypass rising-edge-delay and Mode 7: Bypass falling-edge-delay
Finally the last two entries in
show combinations where either the falling-edge-delay (FED) or
rising-edge-delay (RED) blocks are bypassed.
Table 14. Classical Dead-Band Operating Modes
DBCTL[POLSEL]
DBCTL[OUT_MODE]
Mode
Mode Description
S3
S2
S1
S0
1
EPWMxA and EPWMxB Passed Through (No Delay)
X
X
0
0
2
Active High Complementary (AHC)
1
0
1
1
3
Active Low Complementary (ALC)
0
1
1
1
4
Active High (AH)
0
0
1
1
5
Active Low (AL)
1
1
1
1
EPWMxA Out = EPWMxA In (No Delay)
6
0 or 1
0 or 1
0
1
EPWMxB Out = EPWMxA In with Falling Edge Delay
EPWMxA Out = EPWMxA In with Rising Edge Delay
7
0 or 1
0 or 1
1
0
EPWMxB Out = EPWMxB In with No Delay
shows waveforms for typical cases where 0% < duty < 100%.
Figure 32. Dead-Band Waveforms for Typical Cases (0% < Duty < 100%)
53
SPRUG04A – October 2008 – Revised July 2009
TMS320x2833x, 2823x Enhanced Pulse Width Modulator (ePWM) Module
© 2008–2009, Texas Instruments Incorporated