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LM5022: Migrating SEPIC design from LM3481 to LM5022

Ian Boddy
Intellectual 280 points
Part Number: LM5022
Other Parts Discussed in Thread: LM3481,

Hello all,

     I currently have a SEPIC design working VERY well on the LM3481 (18-28 Vin, 24 Vout, 1A max, 500KHz),

I have an application which will use either 24VDC input or Power over ethernet (37-57VDC) so need to migrate the design to a controller which has a higher maximum input voltage (LM3481 is 48V max input).

The IC I have spotted is the LM5022 which will go up to 60VDC.

Does anyone have any pointers on what I need to look at when I migrate my design?? Im aware I will need to ensure my input stage has higher voltage ratings, the same for the MOSFET etc... I have looked at AN-1484 which is helpful but its just the IC specific parts that I am unsure about.

Best Regards,

  • 0
    TI__Guru* 78070 points

    Hi Ian,

    Thank  you for designing with our devices.  The LM5022 can be a good choice.  Almost any boost controller can implement SEPIC.  Just note that the LM5022 has a regular error amplifier and the LM3481 has a gm type error amplifier. So the loop compensation network connections as well as the compensation selections are different. 

    Best Regards,

    Youhao Xi, Applications Engineering