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UCC25660: Suggestion for DCDC in 3.5 to 5.5 kW range

Scott Swanson
Prodigy 210 points
Part Number: UCC25660
Other Parts Discussed in Thread: UCC28950

Tool/software:

  1. Been looking at LLC and was set to go that way, but I noticed you had suggested Phase Shift for higher wattages. What would you suggest ? We had lots of issues with the UCC28950 at 3kW... 
  • 0
    TI__Guru* 86206 points

    Hello,

    Your inquiry is under review and I will get back to you shortly.

    Regards,

  • 0 in reply to Mike O'
    Prodigy 210 points

    Note that the LLC we are designing would be a full bridge.

  • 0 in reply to Scott Swanson
    Prodigy 210 points

    And, the UCC28950 controller we used would go chaotic at higher current outputs/high noise levels. The FET drive signals were turning ON and OFF not in accordance with the data sheet. 

  • 0 in reply to Mike O'
    TI__Guru* 86206 points

    Hello,

    For higher power applications above 1 kW, generally the phase shifted full bridge  (PSFB) is a better choice.  The UCC28950 has been used in many applications at 3 kW.

    I am sorry that you have had issues with designing PSFB converters in the past.   The following application note goes through the step by step design process of using the UCC28950 in a PSFB.  There is even a link to an excel design tool in the application note that can be used to setup the controller and select power stage components.  I believe this information will help you in the design process and hopefully help resolve any design issues that you have had in the past.

    https://www.ti.com/lit/pdf/slua560

    Customers have found that having a working design for comparison can help in the debug process of there design.  We dot have a 600 W evaluation module that you can order from ti.com that uses the UCC28950.  The following link will bring to this evaluation modules User Guide.

    www.ti.com/.../sluub02

    Thank you for interest in Texas Instruments (TI) products.  If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

    Regards,