This application note describes the cleaning, storage, handling, driving methods
and thermal management for COB products. Table of Content. Characteristics…
COB LED APPLICATION NOTE This application note is for COB products: M20S, M11N, M22N This application note describes the cleaning, storage, handling, driving methods and thermal management for COB products.
Table of Content Characteristics……………………………………………………………………………………………………………………… 1 Handling………………………………………………………………………………………………………………………………. 3 Driving methods…………………………………………………………………………………………………………………… 6 Thermal management.………………………………………………………………………………………………………..10 Packing………………………………………………………………………………………………………………………………..14 Handling............................................................................................................................3 Driving methods..........................................................................................................…. 6 Thermal management .................................................................................................... 10 Packing ............................................................................................................................ 1 RoHS Compliant
SemiLEDs Corporation http://www.semileds.com
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COB Application Note
Cleaning and Storage Cleaning Products were cleaned thoroughly before shipping, which means that in most normal cases there is no need to clean before using. In cases where it cannot be guaranteed that only a minimal amount of dirt and dust particles will come in contact with the product, it is advised to follow the following suggestions. 1. During handling, keeps the environment cleaning. 2. Try swabbing gently using a lint-free swab. 3. If needed, the use of lint-free swab and IPA(isopropyl alcohol) or Alcohol used gently removes dirt from the surface. Do not use other solvents as they may directly react with the LED emitting region. 4. Do not use ultrasonic cleaning that the LED will be damaged. 5. Do not press on the emitting region.
Recommended Conformal Coatings SemiLEDs has found that the following conformal coatings are safe to use with COB products. Conformal coating should not be applied directly to or over the LED emitting area as it may hinder the LED’s optical performance and reliability.
• Humiseal 1H20AR1/S
• Humiseal UV40 • Humiseal 1B73 • Humiseal 1C49LV • Dow Corning 1-4105 • Dow Corning 1-2577 • Dow Corning 3-1953 • Dymax 9-20557 • Shat-R-Shield • TechSpray Turbo-Coat Acrylic Conformal Coating (2108-P) Harmful chemicals SemiLEDs has found the following chemicals to be harmful to COB in testing. The fumes from even small amounts of these chemicals may damage the LEDs.
• Toluene, benzene, xylene • Methyl acetate or ethyl acetate RoHS Compliant COB Application Note V1.1 Subject to change without notice
©2005-2012 SemiLEDs. All Right Reserved www.semileds.com
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COB Application Note
• Cyanoacrylates • Glycol ethers • Formaldehyde or butadiene • Dymax 984-LVUF conformal coating • Loctite Sumo Glue • Gorilla Glue • Clorox Clean-Up Cleaner spray • Clorox bleach • Loctite 384 adhesive • Loctite 242 threadlocker • Loctite 7387 activator Storage SemiLEDs recommend storage conditions Before opened:
• Temperature 5 ～ 30 ℃, Relative humidity less than 60 %, LED should be used within a year. After opened:
• Temperature 5 ～ 30 ℃, Relative humidity less than 60 %., • Please apply soldering within 1 week • LED should be kept in an aluminum moisture proof bag with a moisture absorbent material • Avoid exposing to air with corrosive gas If exposed, electrode surface would be damaged, which may affect soldering.
RoHS Compliant COB Application Note V1.1 Subject to change without notice
©2005-2012 SemiLEDs. All Right Reserved www.semileds.com
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COB Application Note
Handling Recommended Handling If it is necessary to manually pick and place the product, it is recommended to use plastic tweezers or plastic gloves. Do not touch the lens with tweezers or fingers. Gently grab the base of the COB using tweezers.
o
o
x
x
Figure 1. Proper use of tweezers
RoHS Compliant COB Application Note V1.1 Subject to change without notice
©2005-2012 SemiLEDs. All Right Reserved www.semileds.com
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COB Application Note If metal tweezers need be used, do not choose the one list as Figure 2.
●Tweezers
o
x
△ Figure 2. Recommended tweezers selection
Incorrect handling during assembly
x
x Press on the emitting region
Touch the both electrode
Pick up on the emitting region
x
Figure 3.Incorrect handling during assembly
RoHS Compliant COB Application Note V1.1 Subject to change without notice
©2005-2012 SemiLEDs. All Right Reserved www.semileds.com
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COB Application Note Soldering Soldering pads are suitable for electrical wiring. SemiLEDs recommends that the manual soldering condition are 350°C±5°C,
