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Original question:

UCC28950: Design Help

UCC28950: Constant Current Control

Jareth Tan
Prodigy 90 points

Part Number: UCC28950

Tool/software:

i have an application for this chip, whereby the current regulation takes priority.

As such, the output voltage can be left floating in a range of 100V - 200V, depending on the load type.

Since most of the calculations in the datasheet and the TI topologies handbook are done with respect to the voltage:

1. How would this PSFB topology fair against a wide output voltage range?

2. If the powerstage values (such as transformer turns ratio, magnetizing inductance, etc) are fixed based on the output voltage, would there be an issue if these parameters stayed constant when output voltage is left unregulated?

Thanks     

  • 0
    TI__Guru* 86286 points

    Hello,

     

    Your inquiry has been received and will be answered in the order it has been received.

     

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 86286 points

    Hello,

     

    Rather than letting the output voltage float you should do a constant current, constant voltage design.

    This way you will not have run away voltage conditions that could electrically overstress your components on the secondary.

    This was you can control the output voltage to 200 V and then control the current.  If you are loading the output with a battery even know the output voltage is 100 V you can still regulate the current.

    I have attached an application note that will show how to design a constant current, constant voltage feedback loop for your application.

     

    Regards,

    Designing CC-CV Feedback Circuits With the TL103WB.pdf