When soldering white LEDs, we need to pay attention to the following when operating:
1. Always wear anti-static gloves, anti-static wrists, and electric irons must be grounded during production. It is strictly forbidden to touch the two lead pins of white LEDs with bare hands. Because the anti-static of white LED is 100V, and the working humidity on the workbench is 60%-90%, the static electricity of the human body will damage the crystal layer of the light-emitting diode. After working for a period of time (such as 10 hours), the diode will be Invalid (not lit), it will immediately fail in case of seriousness.
2. The soldering temperature is 260 ° C for 3 seconds. If the temperature is too high, it will burn out the chip if it takes too long. In order to better protect the LED, the LED colloid and the PC board should be kept at a distance of 2mm or more, so that the solder heat is dissipated in the pin.
3. The normal working current of the LED is 20mA, and the small fluctuation of the voltage (such as 0.1V) will cause large fluctuations in current (10%-15%). Therefore, in the circuit design, different current limiting resistors should be paired according to the voltage drop of the LED to ensure that the LED is in the best working condition. If the current is too large, the LED will shorten the life and the current will be too small to reach the required light intensity. Generally, the LEDs are separated by color separation, that is, the LED light intensity, voltage, and light color in the same package are indicated on the spectrometer.
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