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AB178 Fiches technique(PDF) 5 Page - Lumileds Lighting Company

No de pièce AB178
Description  Assembly and Handling Information
Download  12 Pages
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Fabricant  LUMILEDS [Lumileds Lighting Company]
Site Internet  http://www.luxeon.com
Logo LUMILEDS - Lumileds Lighting Company

AB178 Fiches technique(HTML) 5 Page - Lumileds Lighting Company

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AB178 LUXEON UV U Line Application Brief 20170620 ©2017 Lumileds Holding B.V. All rights reserved.
5
Figure 4. Do not touch the top of surface of the LUXEON UV U Line emitter when handling a finished board (a)
or stack boards with one or more LUXEON UV U Line emitters on top of each other (b).
2. Printed Circuit Board (PCB) Design Guidelines
The LUXEON UV U Line emitter is designed to be soldered onto a Metal Core PCB (MCPCB) or a ceramic PCB such as
aluminum nitride (AlN). Table 1 shows the differences between these two PCB substrates.
Table 1. MCPCB versus Ceramic PCB Comparison.
MCPCB
ALN CERAMIC PCB
Cost
Low
High
Coefficient of thermal expansion (CTE)
Low CTE matching to LUXEON UV U Line
High CTE matching to LUXEON UV U Line
LED assembly packing density (thermal
resistance consideration)
Suitable for low density with larger
LED to LED spacing
Good for high density where LED to LED
spacing may be as low as 200µm
Mechanical assembly and handling
Generally easy as board does
not easily break
Extra precaution to prevent
ceramic breakage
Solder mask and land pattern
Need to use solder mask to define
land pattern
Land pattern can be defined by top
copper layer, hence no solder mask
degradation over time due to UV light
To ensure optimal operation of the LUXEON UV U Line emitter, the PCB should be designed to minimize the overall
thermal resistance between the LED package and the heat sink.
2.1 PCB Footprint and Land Pattern
The LUXEON UV U Line emitter has two pads that need to be soldered onto corresponding pads on a PCB to ensure
proper electrical operation. Figure 5 shows the recommended footprint designs for LUXEON UV U Line emitters.
Figure 5. Recommended PCB Footprint for LUXEON UV U Line.
NOTE: Solder mask degradation needs to be considered in the end product application requirement.


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