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120VAC Buck LED Driver

Philip McCorkle40
Prodigy 20 points
Other Parts Discussed in Thread: UCC27714, LM3444

I'm designing a non-isolated LED driver for use as a grow light for plants. As such, the user won't ever have access to any wiring, whatsoever, so isolation isn't required. With that said, my ideal solution is a sort of buck topology that takes 170VDC (rectified 120VAC) and supplies a high-power LED with constant current. The voltage of this LED is ~30-32V and requires ~2-3A (100W LED module). It would be a bonus to have this rated for 230VAC, as well.

My current design uses the UCC27714 for the MOSFET gate drivers and an MSP430 as the controller. Any other suggestions?

  • 0
    TI__Mastermind 28655 points

    Hello,

    If you are rectifying 120 VAC you must not care about power factor correction.  A simple solution would be the LM3444.  If you are using the UCC27714 what topology are you using?  As for 230 VAC input with the LM3444, that would just be choosing the correct MOSFET and freewheel diode (or MOSFET if synchronous) at the cost of efficiency and/or cost.

    Thanks,