Texas Instruments AM335 Series

Start
Clk
One
shot
Pulse-width
PCCTL
[OSHTWTH]
PWMA_ch
Bypass
Dividerand
dutycontrol
PSCLK
OSHT
EPWMxA
PCCTL
[CHPEN]
EPWMxA
/8SYSCLKOUT
Pulse-width
Start
shot
Clk
One
PCCTL
[OSHTWTH]
1
OSHT
PCCTL[CHPFREQ]
PCCTL[CHPDUTY]
PWMB_ch
Bypass
EPWMxA
EPWMxB
1
0
0
www.ti.com Enhanced PWM (ePWM) Module
15.2.2.7.3 Operational Highlights for the PWM-Chopper Submodule
Figure 15-37 shows the operational details of the PWM-chopper submodule. The carrier clock is derived
from SYSCLKOUT. Its frequency and duty cycle are controlled via the CHPFREQ and CHPDUTY bits in
the PCCTL register. The one-shot block is a feature that provides a high energy first pulse to ensure hard
and fast power switch turn on, while the subsequent pulses sustain pulses, ensuring the power switch
remains on. The one-shot width is programmed via the OSHTWTH bits. The PWM-chopper submodule
can be fully disabled (bypassed) via the CHPEN bit.
Figure 15-37. PWM-Chopper Submodule Signals and Registers
1539
SPRUH73H–October 2011–Revised April 2013 Pulse-Width Modulation Subsystem (PWMSS)
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