As the price of LEDs has fallen, LED lights have gradually entered thousands of households. How to save the LED lights, let's start from the following aspects!
store
In order to prevent moisture, the LEDs should be stored in a dry and ventilated environment with a storage temperature of -40 ° C - 100 ° C and a relative humidity of 85% or less.
The LED is preferably used within 3 months of its original packaging conditions to avoid rusting the bracket.
When the LED packaging bag is opened, it should be used as soon as possible. At this time, the storage temperature is 5°C-30°C, and the relative humidity is below 60%.
clean
Do not use unknown chemical liquids to clean the LEDs, as this may damage the surface of the LED resin and even cause colloidal cracks. If necessary, please immerse the LEDs in alcohol or fluorinated argon at room temperature for one minute.
Forming
Do not form during or after welding. If necessary, the forming must be completed before welding.
It is important to remember that the behavior of any extruded resin can damage the gold wire inside the LED.
welding
During the welding process, do not apply any external pressure to the lamp body, otherwise cracks may appear inside the LED, which may affect the internal gold wire connection and cause quality problems.
The gel must not be immersed in the solder.
When welding, the solder joint should have at least 2 mm clearance from the lower edge of the colloid. After the soldering is completed, it is necessary to use three minutes to return the LED from a high temperature state to a normal temperature.
If soldering a linearly arranged LED on the same PCB with a soldering iron, do not solder the two pins of the same LED at the same time.
A soldering iron of 30W or less is required for soldering iron soldering.
There are two specifications for LED soldering. The specific parameters are as follows:
Soldering iron soldering temperature: 295 °C ± 5 °C Welding time: within 3 seconds (only once)
Wave soldering soldering temperature: 235 ° C ± 5 ° C soldering time: within 3 seconds
Note: Improper soldering temperature or time control may cause the LED lens to deform or open the inside of the wick to cause a dead light.
Recommended method
In the course of use, whether it is single or multiple use, the dc drive current of each LED is recommended to use the range of ifa 10ma-20ma.
Instantaneous pulses can damage the internal fixed connections of the LEDs, so the circuit must be carefully designed so that the LEDs are not subject to overvoltage (overcurrent) shock when the line is opened and closed.
LEDs require uniform brightness and color when used in multiple applications. Therefore, we must fully understand the driving method and driving conditions. Under normal conditions, we guarantee the consistency of color and brightness of 20 ma.
To achieve uniform brightness and color, the same current should be used for the same batch of LEDs. Do not mix them in use to avoid brightness differences.
The relationship between the vf, if, iv, wl and temperature of the LED is detailed in the product specification.
ESD (static protection)
Static electricity can cause LED function failure. It is recommended to prevent ESD from damaging the LED.
a, LED inspection and assembly must be equipped with anti-static bracelet and anti-static gloves.
b. Welding equipment and test equipment, work tables, storage racks, etc. must be well grounded.
c. Use an ion blower to eliminate static electricity generated by the LED during storage and assembly due to friction.
d. The box with LED is made of anti-static material box, and the packaging bag is made of electrostatic bag.
The anomalies that can be caused by ESD-damaged LEDs are:
a, reverse leakage, light will cause the brightness to decrease, in severe cases the light does not light.
b. The forward voltage value becomes smaller.
When driving at low current, the LED cannot emit light.
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