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Original question:

UCC28950: UCC28950

UCC28950: Design Help

Jareth Tan
Prodigy 90 points

Part Number: UCC28950

Tool/software:

Hi TI experts,

I am intending to use UCC28950 for a PSFB converter application which serves as a constant current source.

1. Is this chip (PSFB) suitable for power range in 2.4 - 4kW?
2. Is there a way to reliably tune the control loop for both CC and CV control such that there is no overshoot and minimal ripples?
3. During operation, the current reference will be changing between anything that is within 0  - full load. Is this topology still suitable? 

  • 0
    TI__Guru* 86286 points

    Hello,

    1. The UCC28950 in a PSFB is suitable for 2.4 to 4 kW.
    2. The following link will bring you to an application note that goes through the a PSFB design using the UCC28950. There is a link to an excel tool inside the application note that goes along with it.
      1. When it comes to output over shoot and under shoot just need to size the output capacitor to handle the changes in current Cout = I*dt/dv. I would recommend using a dt of 1ms for sizing your capacitor.  dV will be the amount of voltage transient you can live with this load transient change.
      2. https://www.ti.com/lit/pdf/slua560
      3. Within the tool and application note there is a section on compensating the voltage loop.
      4. The following link will bring you to an application note that discusses how to compensate both the voltage loop and current loop in this type of design.

    https://www.ti.com/document-viewer/lit/html/slla619?keyMatch=SLLA619&tisearch=universal_search

     

    1. This topology can be used from full load to no load.

     

    Regards,