Texas Instruments 28xxx 사용자 설명서
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Start
Clk
One
shot
shot
Pulse-width
PCCTL
[OSHTWTH]
PWMA_ch
Bypass
Divider and
duty control
PSCLK
OSHT
EPWMxA
PCCTL
[CHPEN]
[CHPEN]
EPWMxA
/8
SYSCLKOUT
Pulse-width
Start
shot
Clk
One
PCCTL
[OSHTWTH]
1
OSHT
PCCTL[CHPFREQ]
PCCTL[CHPDUTY]
PWMB_ch
Bypass
EPWMxA
EPWMxB
1
0
0
2.6.4 Waveforms
PSCLK
EPWMxA
EPWMxB
EPWMxA
EPWMxA
PWM-Chopper (PC) Submodule
Figure 2-31. PWM-Chopper Submodule Operational Details
shows simplified waveforms of the chopping action only; one-shot and duty-cycle control are
not shown. Details of the one-shot and duty-cycle control are discussed in the following sections.
Figure 2-32. Simple PWM-Chopper Submodule Waveforms Showing Chopping Action Only
56
ePWM Submodules
SPRU791D – November 2004 – Revised October 2007