CTR = CMPB
CTR = CMPA
CTR_Dir
CTR = 0
CTR = PRD
Dead
Band
(DB)
Counter
Compare
(CC)
Action
Qualifier
(AQ)
EPWMxB
EPWMxA
CTR = CMPB
CTR = 0
EPWMxINT
EPWMxA
EPWMxB
TZ1
to TZn
CTR = CMPA
Time-Base
(TB)
CTR = PRD
CTR = 0
CTR_Dir
EPWMxSYNCI
EPWMxSYNCO
EPWMxTZINT
PWM-
chopper
(PC)
Event
Trigger
and
Interrupt
(ET)
Trip
Zone
(TZ)
GPIO
MUX
Interrupt
controller
Interrupt
controller
Enhanced PWM (ePWM) Module
www.ti.com
15.2.2.7 PWM-Chopper (PC) Submodule
Figure 15-36 illustrates the PWM-chopper (PC) submodule within the ePWM module. The PWM-chopper
submodule allows a high-frequency carrier signal to modulate the PWM waveform generated by the
action-qualifier and dead-band submodules. This capability is important if you need pulse transformer-
based gate drivers to control the power switching elements.
Figure 15-36. PWM-Chopper Submodule
15.2.2.7.1 Purpose of the PWM-Chopper Submodule
The key functions of the PWM-chopper submodule are:
• Programmable chopping (carrier) frequency
• Programmable pulse width of first pulse
• Programmable duty cycle of second and subsequent pulses
• Can be fully bypassed if not required
15.2.2.7.2 Controlling the PWM-Chopper Submodule
The PWM-chopper submodule operation is controlled via the register in Table 15-35.
Table 15-35. PWM-Chopper Submodule Registers
Acronym Register Description Address Offset Shadowed
PCCTL PWM-chopper Control Register 3Ch No
1538
Pulse-Width Modulation Subsystem (PWMSS) SPRUH73H–October 2011–Revised April 2013
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