Dead-Band Generator (DB) Submodule
action-qualifier submodule to generate the signal as shown for EPWMxA.
• Mode 6: Bypass rising-edge-delay and Mode 7: Bypass falling-edge-delay
Finally the last two entries in Table 2-13 show combinations where either the falling-edge-delay (FED)
or rising-edge-delay (RED) blocks are bypassed.
Table 2-13. Classical Dead-Band Operating Modes
DBCTL[POLSEL] DBCTL[OUT_MODE]
Mode Mode Description
(1)
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
(1)
These are classical dead-band modes and assume that DBCTL[IN_MODE] = 0,0. That is, EPWMxA in is the source for both the
falling-edge and rising-edge delays. Enhanced, non-traditional modes can be achieved by changing the IN_MODE
configuration.
ePWM Submodules52 SPRU791D – November 2004 – Revised October 2007
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