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LM5155: SEPIC reference design for Negtive output

Jimmy WANG
Genius 3665 points
Part Number: LM5155
Other Parts Discussed in Thread: LM5022

Hi team

My customer use the LT3704 original. I want to use LM5155 to replace. Do you have a reference design for the below spec?

Due to webench can not meet the topology. thanks 

Spec below.

Vin=24V

Vo= -15V

Io=2-3A

  • 0
    TI__Mastermind 26050 points

    Hi Jimmy,

    Thanks for using the e2e forum.
    I checked for reference designs of inverting SEPIC (Cuk) controllers, but did not find a design with LM5155.

    We have a design for a similar controller LM5022.
    https://www.ti.com/tool/PMP30487

    LM5155 is a much newer part, so the LM5155 is definitely a better recommendation than LM5022, but the power stage of the reference design can still be used.
    For other component values an pin connections of LM5155, customer can use the quickstart calculator and power stage designer.
    (The quickstarter only features a non-inverting SEPIC configuration, but the power stage designer comes with a Cuk calculator)
    https://www.ti.com/tool/download/SNVR481
    https://www.ti.com/tool/POWERSTAGE-DESIGNER

    Please let me know if there are additional questions.
    Best regards,
    Niklas