LEDs need to pay attention to the following during use:
1, LED pin forming method (1) must be 2 mm from the gel to bend the bracket.
(2) Bracket forming must be done with a clamp or by a professional.
(3) Bracket forming must be completed before welding.
(4) Bracket forming must ensure that the pins and spacing are consistent with the board.
2, LED bending feet and cutting feet Note (1) due to the design needs to bend the foot and cut the foot, when bending and cutting the LED, the position of the bending foot and the cutting foot is more than 3mm from the bottom of the gel.
(2) The bent feet should be made before welding.
(3) When using LED plug-in, the PCB board hole spacing should correspond to the LED pin spacing.
(4) When cutting the foot, the static vibration of the cutting machine generates a high voltage, so the machine should be grounded reliably and do anti-static work (the ion fan can be blown to eliminate static electricity).
3. About LED cleaning When cleaning chemicals with chemicals, special care must be taken because some chemicals damage the surface of the gel and cause fading such as trichloroethylene or acetone. It can be wiped and immersed in ethanol for less than 3 minutes at room temperature.
4, LED over- current protection over- current protection is to give LED series protection resistor to make its work stable, the resistance value calculation formula is: R = (VCC-VF) / IF, VCC is the power supply voltage, VF is the LED drive voltage, IF is Forward current.
5, LED welding conditions (1) soldering iron soldering: soldering iron (up to 30W) tip temperature does not exceed 300 ° C, welding time does not exceed 3 seconds, the welding position is at least 2 mm from the colloid.
(2) Wave soldering: The maximum temperature of dip soldering is 260 ° C, the dip soldering time is less than 5 seconds, and the dip soldering position is at least 2 mm from the colloid.
(Assistant Editor: Shao Wenjing)
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