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LM51571-Q1: LM51571 Inductance calculation

Richard Adrian
Prodigy 20 points
Part Number: LM51571-Q1
Other Parts Discussed in Thread: LM5158, LM5157

Hi, 

 While using LM5157 and LM5158 Quickstart Calculator for SEPIC Regulator Design tool, what does the recommended inductance (LM_calc) signifies? Is this the inductance of the coupled inductor when its coils are connected in parallel? If not, please clarify.

  • 0
    TI__Mastermind 30250 points

    Hi Richard,

    Thanks for using the e2e forum and our quickstart calculator tools.

    The recommended inductance gives a value for the selected primary side inductance of the coupled inductors. The calculators assume that a coupled inductor is used per default.
    The inductance defines the overall current ripple and the entrance point from CCM to DCM operation at light loads.
    To illustrate the impact of different inductances and the difference between coupled and uncoupled inductors, feel free to check our quickstart calculator tool:
    https://www.ti.com/tool/POWERSTAGE-DESIGNER

    Best regards,
    Niklas