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TPS55330: Efficiency at DCM Vin=7.4V, Vout=12.5V

Hirokazu Takahashi
Expert 8420 points
Part Number: TPS55330

Dear support team

I measured the efficiency with TPS55330EM at different inductance. Please see the attached file.
As my measurement result, the efficiency with smaller inductance is better at DCM.
Could you let me know the reason why the efficiency with smaller inductance is better at DCM.

Best Regards,
Hirokazu Takahashi

Vin=4.5-9.5V TPS55330 (2019 07 23).pdf

  • 0
    TI__Mastermind 34201 points

    Hi Hirokazu-san,

    In low load current condition, the DCR of the inductance will have a big influence on efficiency. Smaller inductance with same package has smaller DCR. So DFE322520F 1uH(22mohm) efficiency is the best one.