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LM3405: replacing Schottky diodes with regular diodes

Lenio Cacula
Genius 16350 points
Part Number: LM3405

My customer's application is rather sensitive to cost than it is to efficiency. Aside from heat dissipation, what are the risks in using regular diodes for the circuit instead of the recommended Schottky diodes from our datasheet?

Thank you!

  • 0
    TI__Mastermind 28655 points

    Hello Lenio,

    I'm not sure what you mean by regular diodes.  If you are referring to inexpensive rectifier diodes they probably won't work, especially the 60 Hz rectifiers which would be the least expensive.  This converter is switching at 1.6 MHz.  The diode recovery much be very fast and not cause large reverse current during recovery since that adds to the LM3405 switching loss.  Yes it can be done however I would guess diodes that are not schottky that have little reverse recovery loss will not be less expensive.

    Best Regards,