spreadsheet (LEDDRIVER60VSWIFT-CALC) available for
download at www.ti.com/tool/leddriver60vswift-calc. The
spreadsheet compliments an application note available at
http://focus.ti.com/general/docs/litabsmultiplefilelist.tsp?
literatureNumber=slva374
IMPLEMENTATION
Thermal management is important to achieve the
50,000+ hr lifetime advertised by LED manufacturers. In
order to keep the LEDs cool and to extend their life time,
mount them on a PWB with many thermal vias as shown
in Figure 5. Attach a standard aluminum heatsink to the
back of the PWB. If possible, mount the LED and heatsink
assembly where natural convection can effectively cool
the LEDs. Depending on the application and the chosen
LED viewing angle, you may decide to add a plastic lens
to the LED to focus the light.
Final assembly requires soldering only a few wires to
connect the AC adaptor, LED driver, and LEDs together.
Use a minimum of 22 AWG wire and ensure you don’t
exceed their current carrying capability. The project does
not require adding or modifying any existing household
wiring because the AC/DC adaptor plugs into the same
plug as the old incandescent lights. Mechanically mount
the AC adaptor and LED driver, and secure all loose
wiring. Figure 6 shows how the LED and heatsink
assemblies are glued into the original light fixtures to
provide enough recess so the LEDs and lenses do not
show. The LEDs’ light intensity is matched to the room’s
ambient lighting to give the perfect accent to the curio
cabinet. The slightly blue hue of cool white LEDs perfectly
compliments the china pattern.
Model
324
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The final design replaces two
40W incandescent bulbs (85.3 W)
but only consumes 10.5W which
reduces the curio cabinet’s internal
temperature from 30.0 deg C to
22. 2 deg C. Yearly electricity
savings — based on operating the
lights 12 hours per day at $0.15/
kw-hr — is $45.66. The LED-based
design also eliminates frequent
changing of expensive specialty
incandescent bulbs, which
historically costs me $10 per year.
The result is a $55 reduction in
operating costs per year. The break-even time for this project is 15
months. My project has been
operating seven days a week for 21
months and I’ve yet to replace a
bulb. NV
November 2011 33
