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LM3435: About RIREFx

Junya Kato
Expert 1635 points
Part Number: LM3435

Hello Team,

My customers are planning to set ILEDx at 0.5A or less.
Is there RIREFx test data when ILEDx is set to 0.5A or less?
It is not necessary to be guaranteed data.

According to the data sheet, I think that it becomes the following formula, but the measured value and the following formula were different at 0.5A or less.

　・ILEDx(A) = 24.75/Riref(Ω) x 10^3

Best regards,
Kato

  • 0
    TI__Expert 3920 points
    Hi Kato-san,

    The formula characterized LED current that is above 0.5 A.
    We did not design the device to run below 0.5 A and so never characterized a curve for lower current.

    One question I have though, does the LM3435 running at CCM or DCM?
    If it runs in CCM, the output current should be still close to the equation predicted.
    However, as I mentioned before, we did not characterize < 0.5 A.

    Thanks!
  • 0 in reply to Issac Hsu
    Expert 1635 points
    Hello, Issac-san,

    I always appreciate your polite support.
    I will check the inductor current to the customer and check the operation mode(DCM/CCM).
    In CCM mode, I understood that it is an expectation that it will be close to the equation predicted.

    Best regards,
    Junya Kato