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UCC2891: Is UCC2891 suitable for a isolated power supply which has Vin=9~36V, Vo=12V and Io=5A?

Kazuya Nakai59
Guru 21845 points
Part Number: UCC2891
Other Parts Discussed in Thread: UCC28C50, UCC2800, LM5025A, LM5026

Hello guys,

One of my customers is considering using UCC2891 for their new products.
They want to design a isolated power supply which has Vin=9~36V(DC), Vo=12V and Io=5A.
At this moment, they have the following questions.
Could you please give me your reply?

Q1. Is UCC2891 suitable for a isolated power supply which has Vin=9~36V, Vo=12V and Io=5A?

Q2. Do you have any recommend device to design the power supply except UCC2891?

Q3. Can UCC2891 run on PSpice for TI?

Your reply would be much appreciated.

Best regards,
Kazuya.

  • 0
    TI__Guru 74115 points

    Hi,

    Q1, UCC2891 VIN needs minimum 18V to start, if not using VIN, but VDD, it is minimum 13.2V. So for 9V input, you need to add external circuit to make UCC2891 to start

    Q2, UCC2800, or UCC28C50

    Q3, yes, or use TINA TI.

  • 0 in reply to Hong Huang
    Guru 21845 points

    Hi Hong,

    Thank you very much for your reply.

    The customer has target of efficiency. 
    Case 1. Vin=9V~36V, Vo=12V, Io=5A -> target efficiency 85%
    Case 2. Vin=9V~36V, Vo=24V, Io=5A -> target efficiency 90% (New project)

    They think it is difficult to achieve the target efficiencies with fly back topology.
    So they want to use active clamp forward topology.

    They have the following question at this moment.
    Could you please give me your reply?

    Q1. Do you have any active clamp forward topology device which can start up less than 9V VCC?

    Q2. Do you have any template of PSpice for TI using the selected device at Q1 or UCC2891?

    Your reply would be much appreciated.

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Guru 74115 points

    Hi,

    Q1:LM5025A or LM5026.

    Q2: yes

  • 0 in reply to Hong Huang
    Guru 21845 points

    Hi Hong,

    Thank you very much for your reply.

    Your replies are very helpful!

    Thank you again and best regards,
    Kazuya.