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LM3450: LM3450 can make Triac dimming for 110V-230V？

yy lee
Intellectual 310 points
Part Number: LM3450

LM3450 can make Triac dimming for 110V-230V？

  • 0
    TI__Mastermind 28655 points
    Hello,

    Making a triac dimmable univeral input design is very difficult. What is your power level? The issue with this is the EMI filter. The X-capacitor value will be determined at low input voltage making it a larger value than if this were just 230 VAC. This causes triac compatibility issues for holding current at high input voltage, 230 VAC. Depending on the power level this could be done but not optimal for either input voltage, 110 VAC or 230 VAC and, most likely, will be less efficient than two separate designs.

    Regards,
  • 0 in reply to Irwin Nederbragt
    Intellectual 310 points

    Thank you for your reply.A series of 10W-60W products.How much power range can 110V-230V do?

  • 0 in reply to yy lee
    TI__Mastermind 28655 points

    Hello,

    You can do all of that power range depending on a few things.  Some dimmers require more hold current than others.  The difficult power level will be 10 watts.  The higher power can also be difficult depending on how the EMI filter is designed, more X-capacitor may require more holding current which requires components that can dissipate power.

    For 10 watts capable of 110VAC and 230 VAC inputs the X-capacitor will be sized for 110 VAC which will be larger than needed for 230 VAC.  What this will require, depending on the selection of triac dimmers this needs to work with, is more holding current at 230 VAC.  This just makes it less efficient and overall hotter operating temperature.  It's really designing the circuit, building and testing with all the dimmers that it needs to work with.

    Regards,

  • 0 in reply to Irwin Nederbragt
    Intellectual 310 points

    Input 100V, output 30V, 700mA, how efficient is the scheme?

  • 0 in reply to yy lee
    TI__Mastermind 28655 points

    Hello yy,

    If it is designed for just 100 VAC input it should be capable of 85% efficiency or slightly better depending on the design.  Are you looking at single stage or two stage for your design?

    If it is designed for 110-230 VAC input you may find that it'll be in the low 80% range or low depending on which dimmers you want your design to be compatible with.

    Regards,

  • 0 in reply to Irwin Nederbragt
    Intellectual 310 points

    Thank you for your reply.