LED package common elements

1, LED pin forming method

1 It is necessary to remove 2mm from the colloid to bend the bracket.

2 The forming of the stent must be done with a jig or a professional.

3 Stent formation must be completed before welding.

4 Stent formation needs to ensure that the pin and spacing are consistent with the board.

2. Pay attention to LED bending feet and cutting feet

Because the design needs to bend legs and cut feet, when the LED is bent and cut, the positions of the bent legs and the cut legs are greater than 3 mm from the bottom surface of the gel.

The bent legs should be done before welding.

When using LED plug lights, the PCB board hole spacing should correspond to the LED foot spacing.

When the foot is cut, because the foot cutting machine vibrates to generate a very high voltage static electricity, the machine must be grounded reliably and do a good job of anti-static work (a blowing ion fan can eliminate static electricity).

3, about LED cleaning

Care must be taken when cleaning colloids with chemicals because some chemicals cause damage to the colloidal surface and cause fading such as trichloroethylene, acetone, and the like. Ethanol can be used to wipe and dip. The time should not exceed 3 minutes at room temperature.

4, on the LED over-current protection

Over-current protection is to LED series protection resistor to make it work stable

The resistance value is calculated as: R=(VCC-VF)/IF

VCC is the power supply voltage, VF is the LED drive voltage, and IF is the forward current

5, LED welding conditions

1 soldering iron welding: soldering iron (up to 30W) tip temperature does not exceed 300 °C, welding time does not exceed 3 seconds, welding position at least 2 mm from the colloidal.

2 Wave soldering: The maximum temperature of dipping soldering is 260°C. The dip soldering time is not more than 5 seconds. The dip soldering position is at least 2mm away from the colloid.