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TMS320F280049C-Q1: How to remove jitters in HRPWM

Koichi Saito
Intellectual 2525 points

Part Number: TMS320F280049C-Q1
Other Parts Discussed in Thread: C2000WARE

Hi Expert,

My customer is using F280049C-Q1 and has questions below during their test/development.

Could you please give us the answer ?

--

When we use High-Resolution Period and High-Resolution Control, Jitters (10nsec=1TBLK) happens in PWM pulse output shown in below waveform picture.
  Conditions:
       - Up count mode
       - Control the period and duty with High-resolution.
       - Deadband exists.

Q1) Is the above usage OK for HRPWM ?
Q2) Could you tell us how to remove or reduce the jitters ?
--

For more detail, please refer to excel files.

C28x HRPWM(en).xlsx


Best regards,
Saito

  • +1
    TI__Mastermind 24095 points

    Hi,

    If you are using dead band with High resolution, it's recommended to use Up-Down count mode.
    This is because of the restriction of edge placement in 1st 3 cycles of PWM.
    Please refer to available examples in C2000ware, with deadband and HR in up-down count mode.
    C:\ti\c2000\C2000Ware_3_04_00_00\device_support\f2837xd\examples\cpu1\hrpwm_deadband_sfo_v8