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Original question:

UCC28070: Inductor current not balanced

UCC28070: Coupled Inductor and UCC28070

Aaqib Sheikh
Prodigy 165 points
Part Number: UCC28070

Dear Sir,

Hope you are doing well. Is it possible to replace the individual inductor with the inversely coupled inductor? Do i need to change anything in the Controller? Can you tell me its procedure? 

  • 0
    TI__Mastermind 40070 points

    Hello Aaqib, 

    I'm well, thank you.  

    It is not possible to use any kind of coupled inductor, inversely or otherwise, for the two interleaved phases controlled by UCC28070. 
    This is because the input and output voltages are applied to the two inductors at different times may be for small differences in duration. 
    Coupling the inductors would couple the voltages to each other at the wrong times and interfere with control of the currents.  

    The inductors must be independent. 

    Regards,
    Ulrich

  • 0 in reply to Ulrich Goerke
    Prodigy 165 points

    Any other Controller that can be used for Coupled Inductor PFC

  • 0 in reply to Aaqib Sheikh
    TI__Mastermind 40070 points

    Hello Aaqib, 

     A flyback-PFC uses a coupled inductor as the "transformer", but I don't think that is the kind of coupling that you are asking about. 

     I am not aware of any PFC controller that can use coupled inductors for interleaved phases.

    Regards,
    Ulrich