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High Resolution PWM module in Both Edge Control using CMPAHR

Muhammad Waqar Azhar52965
Intellectual 290 points

hi,

i am using high resolution PWM module for controlling my Buck Converter

previosly i was using normal PWm ,then i migrated to HRPWM

i am trying to use the HRPWM for controlling both edges for better accuracy using CMPAHR  ,is this possible

if yes ,which piints should i consider

regard

waqar

  • 0
    TI__Expert 4120 points

    Hi Waqar,

    Do you require symmetric PWM such as with up-down count mode?

    If not, you can use up-count and set ePWM-A to SET on CTR=ZERO event and CLEAR on CTR=CMPA-UP event to achieve Hi-Res.

    Regards,
    Daniel

  • 0 in reply to Daniel Chang
    Intellectual 290 points

    hi Daniel,

    actually i need symetric PWM AS its a requirement

    do you mean that its impossible to use both edges with CMPA

    now i just implemented falling edge with symetric PWM setting on CTR=CMPA down and Clearing on CTR=CMPA up

    it seems to work fine ,but it still gives me enough performance

    regard

    waqar

  • 0 in reply to Daniel Chang
    Intellectual 290 points

    hi Daniel,

    actually i need symetric PWM AS its a requirement

    do you mean that its impossible to use both edges with CMPA

    now i just implemented falling edge with symetric PWM setting on CTR=CMPA down and Clearing on CTR=CMPA up

    it seems to work fine ,but it still doesn't gives me enough performance

    regard

    waqar

  • 0 in reply to Muhammad Waqar Azhar52965
    TI__Expert 4120 points

    I believe that when configured for up-down count and BE control, the PWM module will allow for high-resolution positioning of both the rising and falling edges for high-resolution duty using CMPAHR register.