Complimentary PWM in Piccolo

Alberto Soattin

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

over 16 years ago

Lori Heustess over 16 years ago

TI__Guru* 91005 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

Alberto Soattin over 16 years ago in reply to Lori Heustess

TI__Genius 16905 points

Hi Lori,

many thanks for your help, it solved the issue!

Alberto

C2000™︎ microcontrollers

C2000 microcontrollers forum

Complimentary PWM in Piccolo