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LM3410: LM3410 question

Patrick Chen
Mastermind 8875 points
Part Number: LM3410

Hello,

             If would like to add proetciton circuit on LM3410, What is below suitable R3 value ? Will be affect the ILED current setting? Thank you.

BR

Patrick

  • 0
    TI__Mastermind 25500 points

    Hello Patrick,

    It really depends on what you want/need to limit the zener current to. The OVP max output voltage will be Vz + 190mV. So referring to the datasheet designators for the OVP section you can calculate R3 using:

    R3 = (190mV/Iz) - R1

    You know R1 so you can plug in your Iz and get the R3 value.

    Using this OVP circuit will not affect regulation during normal operation as the zener will not be conducting.

    Regards,

    Clint