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LM3410: Difference between circuit with and without inductor

Franz Schellhase
Expert 3605 points
Part Number: LM3410

Hi team,

Can you answer my customer's question, please?

What is the difference between the LED driver with and without the inductor? As the SW8101 solution without any inductor and it acts as a current mirror to the LED also. So I would like to know about the technology behind it.

Thank you,

Franz 

  • 0
    TI__Expert 3920 points

    Hi Franz,

    There are 2 types of LED drivers, one type is based on linear solution that can be run without inductors. The other type is based on DC/DC switching regulators.

    With an input voltage that is always be higher than LED voltage, one could use linear LED driver in order to avoid inductances and switching frequencies. However, thermal handling should be taken care of and the total power conversion efficiency goes lower once LED voltage is far from input voltage.

    DC/DC switching regulator based solutions provide flexible input / output voltage relationship as it can be used as buck / boost / buck-boost topologies.

    Of course, trade off would be the complexity as you need to work on DC/DC power engineering designs.

    Thanks!