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Complimentary PWM in Piccolo

Alberto Soattin
Genius 16905 points
Other Parts Discussed in Thread: TMS320F28027

Hi Champs,

 one of my customer is developing with PiccoloA TMS320F28027 and is using PWM as descirbed in doc. SPRUGE9. They need to use the two PWM independently (through AQCSFRC), and in order to do this they are trying to set CSFB and CSFA independently. The resul is that the two PWM seem to work in complimentary mode instead of the independent mode. What should be the bug in code?

Thanks and regards,

Alberto

  • TI__Guru* 90995 points

     Alberto,

    Can you check if they have set DBCTL[OUT_MODE] = 0? 

    Refer to the Configuration Options for the Dead-Band Submodule figure 2-28, page 55, in the ePWM ref guide (SPRUGE9).  If OUT_MODE is 00, then the EPWMA and EPWMB outputs are independent.  Otherwise EPWMB may be derived from EPWMA (or vice versa depending on the IN_MODE & OUT_MODE settings).

    Regards,

    -Lori

  • in reply to Lori Heustess
    TI__Genius 16905 points

    Hi Lori,

    many thanks for your help, it solved the issue!

    Alberto