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UCC28063: About Inductor current mode (CCM/DCM/CRM)

Tao_2199
Genius 5660 points
Part Number: UCC28063
Other Parts Discussed in Thread: UCC28056

Hello,

 

Regarding to inductor current mode on UCC28063, my customer is asking a question.　

(Question)

Is DCM or CRM supported on this device?

It seems that there is only description of CCM on datasheet.

Just in case. I'm asking that.

 

Regards,

Tao 2199

  • 0
    TI__Mastermind 26215 points
    Hi Tao_2199,

    Thanks for your interest in UCC28063. This controller supports CRM (transition mode). This controller does not support CCM however.

    Best Regards,
    Ben Lough
  • 0 in reply to Benjamin Lough
    Genius 5660 points
    Hello Ben,

    Thank you for reply.

    UCC28063:
    CRM -> Supported.
    CCM -> Not Supported.
    DCM -> Not Supported.
    My understanding is correct?

    Regards,
    Tao 2199
  • 0 in reply to Tao_2199
    TI__Mastermind 26215 points

    Hi Tao2199,

    UCC28063 is designed to operate in CRM mode. It is possible to enter DCM operation at very light load however.

    Best Regards,

    Ben Lough

  • 0 in reply to Benjamin Lough
    Genius 5660 points

    Hello Ben,

     

    Additional questions

    (1) According to UCC28063 datasheet (page1),it seems that CCM is supported.(Below)

    Is that wrong description? I’m confused ,and which is correct?

     


     

    (2) About switching CRM and DCM on UCC28063.

    Is principle same as UCC2056(UCC2805x)?

    (Below: UCC2056 datasheet,page14)

     


    Regards,

    Tao 2199

  • 0 in reply to Tao_2199
    Genius 5660 points

    Hello Ben,

     

    Would you let me know current status about CRM and CCM on UCC28063?

     

    Regards,

    Tao 2199

     

    Hello Ben,

  • 0 in reply to Tao_2199
    TI__Mastermind 26215 points
    Hi Tao_2199,

    The first page is comparing interleaved transition mode PFC to single phase CCM. It is stating that an interleaved transition mode PFC typically has better efficiency than a single phase CCM PFC. UCC28063 supports interleaved transition mode.

    UCC28056 is more of a mixed DCM/TM controller that is designed to operate at light to medium loads in DCM. This is different than UCC28063. UCC28063 has a maximum frequency setting. Going from heavy load to light load, the switching frequency of a transition mode PFC increases. As the load is further decreased, you can hit the maximum frequency setting which will delay the next gate turn on. This delay will result in DCM operation.

    Best Regards,
    Ben Lough