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UCC28951-Q1: Controlling the input current

Gabriel Sampaio
Prodigy 20 points
Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC28951

Tool/software:

So, I utilizes the WEBENCH® POWER DESIGNER to develop a DC/DC for a Fuel cell application where the input voltage varies within 23 to 51 volts and the output is set to 48 volts and 50 A maximum, however I would like to control the output current, since the system should not work at maximum current most of the time. For that I imagined that I could try to  control it by connecting the Groung of the CS circuitry to an low-pass filter that would be driven from an high speed optocoupler driven by a PWM, that way when PWM duty cycle was 0 my system would limit itself at 50A, and when the duty cycle would be higher I would get less current. Would that work or are there any other solutions for that?

Circuit that was designed

  • 0
    TI__Guru* 86286 points

    Hello,

     

    I would suggest designing for constant current and constant voltage-controlled design.  This requires two feedback loops.  A voltage loop and a current loop.  It does require a shunt as you suggested. 

    I did find a 2-kW reference design using the UCC28951 that uses constant current constant voltage control.  You can find it at the following link. You will find schematics and test data for this design at this link as well.  Hopefully this information will help you with your design. 

    https://www.ti.com/tool/PMP8740

     

    Regards,