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LM3508: LM3508 vs LM3509 question about calculation formula

Bob Lee62837
Mastermind 7230 points
Part Number: LM3508
Other Parts Discussed in Thread: LM3509

Dear support member,

My customer used LM3508.

I have question about calculation formula.


LM3508 datasheet 14 page formula 9 include Inductor.

LM3508 same series LM3509 datasheet 22 page formula 8 do not include Inductor.


Why does LM3508 formula 9 include Inductor?


I have attached file.

Could you check attached file?


Best regard.
Bob Lee.

LM3508 question.pdf

  • 0
    TI__Prodigy 60 points

    Hi Bob,

    Your observation is right. There is a typo in the LM3508 data sheet. It was confimed by one of our designers in the resonse below.We will correct it as soon as possible.

    Thanks for the heads-up

    John Parry

    Mobile Lighting and Power Product Line

    Hi John,

                    Yes, the L should NOT be in the denominator of the formula. The equation (8) in LM3509 is correct. The equation (9) in the LM3508 is NOT correct.

    Best Regards,

    Nat

     

    LM3508 DS

     

    LM3509 DS

     

  • 0 in reply to John Parry1
    Mastermind 7230 points

    Dear John Parry1,

    Thank you very much for response.


    Best regard.
    Bob Lee.