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TMS320F28379D: Problem in getting phase shifted ePWM

ASHWINI DUBEY
Prodigy 30 points
Part Number: TMS320F28379D


Is there any rule that if we are using ePWM4, ePWM5, ePWM1 and ePWM2 then we have to make ePWM1 as master for getting phase shift signals? Actually, I was trying to make ePWM4 as master and the rest all as slaves but then I am not getting proper waveform. When I am selecting ePWM4 as master and ePWM5 as slave I am getting desired wave form, but When I am selecting ePWM4 as master and ePWM1 as slave I am no getting desired wave form rather frequency of ePWM1 getting changed to some other value. 

  • 0
    TI__Mastermind 25800 points

    Hi Ashwini,

    ASHWINI DUBEY said:
    Is there any rule that if we are using ePWM4, ePWM5, ePWM1 and ePWM2 then we have to make ePWM1 as master for getting phase shift signals?

    In general yes, EPWM4 cannot serve as the synchronization source for EPWM1. Below is a diagram of the synchronization scheme for this device. Notice that the sync output of EPWM1 only feeds into EPWM2 (which can then be fed into EPWM3) and EPWM 4 (to then be fed into EPWM 5/6) etc. 

    There is no connection from EPWM4's sync out pulse to be an input for EPWM 1's synchronization input. 

    Best Regards,

    Marlyn