TMS320F28374S: PWM1/8/10 channel A/B has 150ns phase difference with the same cmp configuration

Hello,

Did customer use software example from C2000Ware: C:\ti\c2000\C2000Ware_5_04_00_00\driverlib\f2837xs\examples\cpu1\epwm\epwm_ex2_updown_aq ?

Hi Stevan

 the SDK DEMO is： D:\ti\c2000ware\C2000Ware_5_02_00_00\device_support\f2837xs\examples\cpu1\epwm_updown_aq

thanks

joe

Hello Joe,

The example configures ePWM1, ePWM2, ePWM3 to produce a waveform with independent modulation on EPWMxA and EPWMxB. 

To confirm data, view the EPWM1A/B (PA0_GPIO0 & PA1_GPIO1), EPWM2A/B (PA2_GPIO2 & PA3_GPIO3) and EPWM3A/B (PA4_GPIO4 & PA5_GPIO5) waveforms via an oscilloscope.

Out of provided signals, which ones have 150ns phase difference so I can look why that would happen? Did customer modify the code? If yes, what are the modifications?

Hi Stevan

Stevan Duraskovic said:

Out of provided signals, which ones have 150ns phase difference so I can look why that would happen?

ePWM1/8/10 have the issue.

Stevan Duraskovic said:

Did customer modify the code? If yes, what are the modifications?

Yes, he change the CMP value to CMPA=CMPB=500, and to verify ePWM8 and ePWM10 function, he change the ePWM2, ePWM3 to ePWM8, ePWM10

Thanks

Joe