Datasheet
LUXEON LED Assembly and Handling Application Brief AB32 20121217 18
90 Vias
124 Vias
LUXEON LED Spacing 2mm 4mm
Rθ per LED 7K/W 6.8K/W
(simulation estimate)
c-hs
Figure 22. When the edge to edge spacing is reduced from 4 to 2mm, the number
of vias decreases from 124 to 90. Thermal resistance values are simulated.
0
2
4
6
8
10
12
14
0123
45
spacing (mm)
board thermal resistance Rth
c-hs
(K/W)
Rth (c-hs) 4LED cluster
Figure 21. Simulated Rθ
c-hs
values for close spacing of LEDs for a two layer FR4 PCB.