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LM5155: LM_CALC

Kuramochi Tadahiko
Guru 28715 points
Part Number: LM5155
Other Parts Discussed in Thread: LM5122

Hi,

I'm using the calculator as below;

However, LM_CALC result is not matched my calculation.

=26.4*0.37/(6.364*0.6*500kHz) = 5.1uH

Is my calculation incorrect?

Best Regards,

  • 0
    TI__Mastermind 21720 points

    Hi Kuramochi Tadahiko,

    Thanks for reaching out with your questions and for considering the LM5155 in your design.

    There is an issue in this version of the calculator when the duty cycle for the boost converter doesn't reach 33% duty cycle. This will be updated in the next revision of the calculator. You r calculation is correct.

    Looking at the design specification I think using s synchronous boost controller might fit the application better as the power is 168W. Please take a look at the LM5122.

    Please let me know if you have any questions.

    Thanks,

    Garrett 

  • 0 in reply to Garrett Roecker
    Guru 28715 points

    Garrett-san,

    Thank you for your support.

    >Looking at the design specification I think using s synchronous boost controller might fit the application better as the power is 168W. Please take a look at the LM5122.

    How much is the recommended maximum output power for LM5155?

    I would like to know it for my reference.

    Best Regards,

    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Guru 65280 points

    Hello Kuramochi,

    I would say that there is not a hard value for the output power for the LM5155, it is more a decision on when the power dissipation in the output diode is getting high compared to the losses in a transistor.