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PMP9640: L1 and L4

May
Genius 9880 points
Part Number: PMP9640
Other Parts Discussed in Thread: UCC28019

Hi,

Customer want to know if  the L1 and L4 in the design is CMC or DMC filters? Also what is the frequencies.

Additional question is why the design shown for the PMP9640 the 5 legs of these are not connected to anything. According to them, it is the only component that I have not been able to replace.

Thank you in advance

Regards,
Maynard

  • 0
    TI__Expert 6110 points

    Hi Maynard,

    L1 and L4 are differential mode chokes. I have reached out to the original design for more information.

    Thanks,

    Robert 

  • 0 in reply to Robert Taylor1
    TI__Genius 9880 points

    Hi Robert, 

    Thank you for the information, looking forward to your update.

    Regards,
    Maynard

  • 0 in reply to May
    TI__Expert 4260 points

    Maynard,

    L1 and L4 are PFC inductors. See details in my article about semi-bridgeless PFC:

    https://www.ti.com/lit/an/slyt599/slyt599.pdf?ts=1649343409337

    Winding 5-6 of L1 and L4 was there for general zero current detection (ZCD) of a critical mode conduction (CRM) PFC. But in PMP9640 design, the ZCD function was realized by the RCs (C48, C49, R53, R54, R101, R102), therefore I left pin 5 open.

    In other word, you could remove the winding (5-6) if you follow the same ZCD detection method used in PMP9640

  • 0 in reply to Sheng-yang Yu1
    TI__Genius 9880 points

    Hi Sheng-yang,

    Thank you for the information, customer have follow up question regarding the design. Please see details below.

    '
    If I want to change the UCC28051D component for the UCC28019 component, both have the same number of pins. The first one has 3 operation modes (CCM, DCM, CRM) and the second one has only one (CCM). I have noticed that some pins have similar functions.
    The question is whether I can substitute the first one for the second one and for the CCM mode. What does the change affect? I can be guided by:
    Design a transition-mode, bridgeless PFC with a standard PFC controller

    Can I use the UCC28019 datasheet to perform new calculations and simulate them?
    "

    Thank you in advance.

    Regards,
    Maynard

  • 0 in reply to May
    TI__Expert 4260 points

    No, these two controllers (UCC28051D and UCC28019) have totally different control scheme, therefore the power stage design is totally different.