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UCC28911: Non-insulated design capable of output 2.5W (5V, 0.5A)

Y.Ottey
Mastermind 6145 points
Part Number: UCC28911
Other Parts Discussed in Thread: UCC28730, UCC28910

Dear TI Team

Our customers are looking for reference designs and devices that meet the following conditions:
・ AC85 ~ 264V input
・ 5V 0.5A output
・ Non-insulated type

I searched for a reference design, but there is no design that can output 2.5W (5V, 0.5A), and there are only designs with output up to 2W (20V, 0.1A) as shown below. (I checked on WEBENCH, but only the Flaback configuration appears.)
https://www.ti.com/tool/PMP4443

https://www.ti.com/tool/PMP20834

Please let us know if there is a reference design or solution that meets the above conditions.

Best Regards,

Y.Ottey

  • 0
    TI__Guru 66065 points

    Hello,

    It sound like you customer would like to do an offline buck design.

    I would like to point out the fly back converter for an offline design has lower input and output RMS current than a buck converter and is more efficient.

    However, if you customer wants to do an an offline design the UCC28730 can be used in a high side buck converter.  The following will get you to a 144V to 14 V reference design. 

    I do know customers have done offline designs using the UCC28730.

    Regards,

  • 0 in reply to Mike O'
    Mastermind 6145 points

    hi Mike

    Thank you for your reply.

    Thank you for the information on UCC28730.
    When I checked if there was a configuration that satisfied the conditions listed in the first post, I found the following materials.
    www.ti.com/.../snva750.pdf

    If you check 2 Design Parameters Consideration in the above document, you think that the following conditions can be satisfied by changing the peripheral constants of UCC28910. Is this correct?
    ・ AC85 ~ 264V input
    ・ 5V 0.5A output
    ・ Non-insulated type

    Regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    TI__Guru 66065 points

    Hello,

    You should be able to use the UCC28910 in a high side buck application for a 5V 500 mA.  The limitation of this device is the output voltage cannot be less than 5V in this configuration.  The VS pin controls the output with a reference of 4V and a OVP of 4.6V.  This should not be a problem for your application.

    Regards,