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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 Triboelectrification potential: 100V Body Resistivity: 103~108/c 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 260 welding time no more than 3seconds, welding position at least 2mm away from colloid. (2) Immersion soldering: limited temperature 260 ; 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: -40 ~85 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: -40 ~100 -20 ~50 is recommended. z Circumstance Humidity: 30%~70%, 40%~60 % is recommended. -7- |
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