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TMS320F28035: Resolution of PWM in Peak Current Mode Control

yy S
Prodigy 110 points

Part Number: TMS320F28035

Hi Ti,

Is ePWM1A pulled down immediately when the current reaches the reference in Peak Current Mode Control？

I mean is there a the effective resolution(Coarse step size(1 SYSCLK cycle) ) in Peak Current Mode Control？

  • 0
    TI__Mastermind 27050 points

    Hello,

    yy S said:
    Is ePWM1A pulled down immediately when the current reaches the reference in Peak Current Mode Control？

    Yes, this should happen immediately. Once there is a trip, the EPWM output will go to the configured state, in this case low.

    Best Regards,

    Marlyn

  • 0 in reply to Marlyn Rosales Castaneda20
    Prodigy 110 points

    Hi Marlyn,

    Thanks for you reply.

    Another questions:

    I want to know the accuracy of PWM in peak current mode?  The minimum step size of PWM in peak current mode is one SYSCLK cycle,is right? According to TRM, it seem that HPWM cannot be applied to  peak current  mode,is right?

    Thanks.

  • 0 in reply to yy S
    TI__Mastermind 23481 points

    Hello,

    I have brought in another expert to look at this inquiry. They are out of the office until Tuesday, so please expect a response by Wednesday at the latest. I appreciate your understanding

    Regards,

    Peter

  • 0 in reply to yy S
    TI__Intellectual 1200 points

    Hi,

    According to the TRM of TMS320f28035 https://www.ti.com/product/TMS320F28035. 

    1) I want to know the accuracy of PWM in peak current mode?  The minimum step size of PWM in peak current mode is one SYSCLK cycle,is right?

    Page 556, 9.1.1 Features of comparator: The output of the comparator can be passed asynchronously, or be qualified and synchronized to the system clock period. 

    2) According to TRM, it seem that HPWM cannot be applied to  peak current  mode,is right?

    I was not able to find the statement that HRPWM cannot be applied for PCMC in the TRM. Could you let us know which page indicates it?

    Thanks,

    Qing