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8
Leds Application Manual
1. Anti-static Note and Methods
InGan or GaN blue, green, white leds must avoid static electricity damage. When
operating, remove any static electricity source; clear up static electricity; expedite the
dissipation of electric charge. In most cases, static electricity arises from leds lead
forming, installing, soldering and cleaning.
Main methods preventing static electricity
z Paving floor with anti-static floor board, installing earth connecting dissipation
system as well. (Surface Resistivity: 106~109/c ΃)
z Using static electricity sensitive parts on anti-static work table, basic earthing
requirement:
Surface Resistivity: 106~109/c ΃
Body Resistivity: 103~108/c ΃
Triboelectrification potential: 100V
Static electricity voltage attenuation time: 0.5S
z
z
z
z
z
z
z
z
Applying static electricity sensitive parts in effective scope (within 60cm generally)
of working uniflow ionic blower.
Relative Humidity in static preventing zone should be over 50%, better ranking
70%~80%.
Separating ground, wall, working table, equipment, instrument and wrist strip
according to working area and unit, earthing in sequence, and then converging into
assemble line connecting with ground.
In static preventing area, instruments like container, clamp, instruments underlay,
electric iron etc should all comply with anti-static electricity standard. In the mean
time, operator must wear anti-static electricity jumper, shoes, hat and using
anti-static electricity wrist strips, elbow or ankle strap.
Do not use nylon bag, ordinary plastic bag or ethane material pack static electricity
sensitive parts.
Static electricity sensitive parts must be packed under anti-static electricity box or
carton before it is shipped or transported.
In transportation or passing, avoid mechanical vibration and strike.
In Storage of static electricity sensitive parts or PCB fixing static electricity sensitive
parts or whole machine, necessary anti-static electricity measures should be
taken.
If leds damaged by static electricity, some poor performance appears, such as
creepage current increasing, static forward voltage decreasing or increasing, no
lighting or lighting abnormally under low current test.
-1-
2. Technical Requirement in Led Application.
A. Leads forming
Methods:
(1) Bending frame 2mm from colloid.
(2) Using clamp or operated by professional staff.
(3) Frame forming must be finished before soldering.
(4) Leads distance must be consistent to circuit board.
(5) Do not add external power squeezing leds colophony to avoid damaging PINs in
colloid.
(6) Avoiding bending in the same position of leads twice or more.
B. Installation
Led Installation methods
(1) Attention on the arrangement of external cables of parts where leds fixed to avoid
wrong electrode installation. Parts should be away from heat source and operated
under it’s limited working conditions.
(2) Leds with distorted leads are not allowed installed.
(3) Don’t press leads when Leds are installed on bottom board.
(4) Guide cap is recommend to use for Leds positioning.
(5) Avoid any vibration or external strength before soldering temperature turn back to
normal.
-2-
C. Soldering
(1) Electrical iron welding: Top end temperature of Iron (Max 30W) under 260ć
welding time no more than 3seconds, welding position at least 2mm away from
colloid.
(2) Immersion soldering: limited temperature 260ć; immersion time under 3 seconds;
immersion position at least 2mm away from colloid.
(3) Wave Soldering
a. Wave Soldering with Pb-Sb Solder
-3-
b. Pb-free Wave Soldering
-4-
(4) Reflow Soldering
a. Reflow Soldering with Pb-Sb Solder
-5-
a. Pb-free Solder Reflow Soldering
D. Cleaning
(1) Take care using chemical cleaning leds colloid, some chemicals like
Trichloroethylene, Acetone may damage surface of colloid causing fading; Ethyl
alcohol could be used for cleaning and dipping but less than 3 minutes under
normal temperature.
(2) Use Neutral Soldering if possible.
(3) Do not clean by water, the remaining water may lead to rustiness.
-6-
(4) Leds may be damaged in ultrasonic cleaning. For safe, sample test first before
mass cleaning.
3. Careful
Using series connection protecting resistance to keep leds working stably, resistance
value counting: R=(VCC-VF)/IF, VCC=Power Supply Voltage; VF=Leds Drive Voltage;
IF=Current.
4. Electrical Characteristics Testing and Led Using
z Testing VF, Brightness and Wavelength at 20mA; Testing IR, IR should be less
than or equivalent to prescribed value when set VR=5V.
z Testing or using leds, drive each led at the same current to keep consistence of
brightness or other characteristics.
z Operating temperature: -40ć~85ć
z Do not using different BINs(Marked on every bag) on one product to avoid color
and brightness difference. If mix-up is inevitable, apply leds according to different
circuit., put nearest BINs together.(Avoid this situation if possible.)
5. Storage Conditions
z Circumstance Temperature: -40ć~100ć-20ć~50ćis recommended.
z Circumstance Humidity: 30%~70%, 40%~60 % is recommended.
-7-