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UCC25706: Looking for reference design / design calculation with buck controller (external Switch)

Rajkumar G
Prodigy 85 points
Part Number: UCC25706
Other Parts Discussed in Thread: UCC25705

Hi,

Request your support on the below queries on priority

1. Required for reference design with UCC25706 (Buck converter)

2. Required UCC25706 design calculator

3. Can I use this UCC25706 IC for the power rating of 400W as a buck controller (External Switch) (Vout - 170VDC & Iout - 2.35A)

  • 0
    TI__Expert 6080 points

    Hello Rajkumar,

    Below is the link to the excel sheet for caalculating the Oscillator parameters:

    http://www.ti.com/tool/ucc35705or6calc

    Please refer to the Power stage designer tool for any further design calculations:

    Please help me understand the nature of your application better: you want to use UCC25706 in a buck topology to generate 170Vdc/2.35A; what is the input to this deign?, what is the end application. I can possibily refer to a better suited topology if you share your design spec.

    Regards,

    Sonal

  • 0 in reply to Sonal Singh
    Prodigy 85 points

    Hello Sonal Singh,

    Thank you for your updates,

    Here are my requirements:

    Input:

     

    Input Voltage : 390VDC (+/- 5%)

    Topology : Buck Topology by using UCC25705/6

    Output (from Buck)

    Output Voltage : 170VDC (+/- 5%)

    Output Current : 2.35A (3A-Max)

    Output Power 400W

    Typical Application:

    Solenoid control (On-Off) 

    Hope you have clear with the requirements.

    Request your support on further supports.

    Regards,

    Rajkumar G

  • 0 in reply to Rajkumar G
    TI__Expert 6080 points

    Hello Rajkumar,

    For this high input voltages and 450W output I would highly recommend using the phase shifted full bridge topology to mantain the converter efficicency.

    Please refer to the attached paper design for desiging the power stage. PMP21427A(001)_Sch.PDF