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PMP23340UCD: Adjust the PWM phase shift in resonant mode

Martin
Prodigy 170 points
Other Parts Discussed in Thread: PMP23340UCD, UCD3138A

Hi，

Thank u for ur time.I have some doubts about PMP23340UCD.

Hardware：PMP23340UCD(UCD3138A) （48v-12v）
Firmware：TI supplied routines——UCDIBCFirmware

When the board is working in resonant mode, I want to modify the phase shift of DPWM0 and DPWM2 on the primary side, via the GUI.

  • In the init_dpwm2() function, change the INTRA_MUX in resonant mode from BELOW to CROSSOVER.But the board works intermittently.What is it about?

  • I'm guessing the following code is causing the board to work intermittently,after the modification, DPWM2 at resonance is not in phase with DPWM0, correct?
  • What does this code do?

  • Modified in the main function, the board works fine, but why is the current getting higher? Is it because there is still a phase difference?
  • How do I properly implement the phase shift control of DPWM0 and DPWM2?

Regards，

Martin.

  • +1
    TI__Genius 14580 points

    Hi, Martin,

    PSFB is used during the startup, then it is changed to resonant mode after startup. It is controlled by mode switching module. I don't think the PSFB can be changed from GUI, and need be done from firmware. 

    Regards,
    Sean