TMS320F280049: HRPWM duty cycle limitation workaround

Sheldon He

Hi expert,

I am searching for solution regarding limits in duty cycle when HRPWM is used per noted in TRM. I though this topic should already have a best practice. Could you guide me to the thread on our solution?

Also related to:

Thanks

Sheldon

over 5 years ago

0 Nima Eskandari over 5 years ago

TI__Guru 52220 points

Are you trying to get 100% and 0% duty?

0 Sheldon He over 5 years ago in reply to Nima Eskandari

TI__Expert 8585 points

Hi Nima,

Yes, both for low duty cycle like 0% to 1% and high duty cycle like 99% to 100%.

Thanks

Sheldon

0 Nima Eskandari over 5 years ago in reply to Sheldon He

TI__Guru 52220 points

If you are needing 0 and 100%, you have many options, mentioned in the attached E2E in the question.

If you need 1%, 99%, then before updating the CMPx to the corresponding value, DISABLE HR capability.

Nima

0 Sheldon He over 5 years ago in reply to Nima Eskandari

TI__Expert 8585 points

Hi Nima,

Does that mean it will not be possible to use HR duty within three EPWMCLK cycles after the period starts unless I tried software froce or evetn force to turn on/off EPWM?

Thanks

Sheldon

0 Nima Eskandari over 5 years ago in reply to Sheldon He

TI__Guru 52220 points

Sheldon,

You just cant have HR capability within the restricted ranges. No workaround. if your duty is falling in that range, you can disable the HR and just have standard EPWM resolution in that range.

Nima

0 Sheldon He over 5 years ago in reply to Nima Eskandari

TI__Expert 8585 points

Hi Nima,

Thanks for clarification!

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TMS320F280049: HRPWM duty cycle limitation workaround