In any LED power supply design, the physical design of PCB board is the last step. Its design method determines electromagnetic interference and power supply stability. Let's analyze these steps in detail:
Component parameters -> input principle network table -> design parameters setting -> manual layout -> manual wiring -> verification design -> review ->CAM output.
Parameter setting the spacing between adjacent wires must be able to meet the electrical safety requirements, and in order to facilitate operation and production, the spacing should be wider as far as possible. The minimum spacing should be at least suitable to withstand the voltage, in the wiring density is low, the signal line spacing can be appropriately increased, for high and low level wide gap of the signal line should be as short as possible and increase the spacing, generally set the line spacing is 8mil.
The distance between the edge of the hole in the welding disk and the edge of the printed board should be more than 1mm, so as to avoid the loss of the welding disk during processing. When the wire connecting with the welding plate is thin, the connection between the welding plate and the wire should be designed in the shape of water droplets. This advantage is that the welding plate is not easy to skin, but the wire and the welding plate are not easy to disconnect.

3. The practice of component layout has proved that even if the circuit schematic diagram is designed correctly and the printed circuit board is designed improperly, the reliability of electronic equipment will be adversely affected. For example, if two thin parallel lines on a printed board are very close together, a delay in the signal waveform will be formed and reflected noise will be formed at the end of the transmission line. As a result of the power supply, ground wire caused by inconsiderate interference, will make the product performance decline, therefore, in the design of printed circuit board, should pay attention to the correct method.
The wiring switch power supply contains high-frequency signals. Any printed line on the PCB can act as an antenna. The length and width of the printed line will affect its impedance and inductance, thus affecting the frequency response. Even printed lines that pass through a DC signal can be coupled from adjacent printed lines to the RF signal and cause circuit problems (or even emit interference signals again).

The wiring switch power supply contains high-frequency signals. Any printed line on the PCB can act as an antenna. The length and width of the printed line will affect its impedance and inductance, thus affecting the frequency response. Even printed lines that pass through a DC signal can be coupled from adjacent printed lines to the RF signal and cause circuit problems (or even emit interference signals again).
5, check the wiring design is completed, it is necessary to carefully check the wiring design by the designers is in line with the rules, rules at the same time also need to confirm whether accord with the demand of the PCB production process, general inspection line to line, line and element bonding pad, the line and communicating pores, element bonding pad and communicating pores, through hole and the distance between the through hole is reasonable, whether to meet the production requirements. Whether the width of the power cord and ground wire is appropriate, and whether there are places in the PCB where the ground wire can be widened. Note: Some errors can be ignored. For example, some connectors have part of their Outline outside the Outline, which may cause errors when checking the spacing. In addition, after each modification of the wire and through the hole, it should be coated with copper again.
6. Review according to the "PCB Checklist", including design rules, layer definition, line width, spacing, welding plate and hole setting, and also focus on the review of the rationality of device layout, wiring of power supply and ground network, wiring and shielding of high-speed clock network, placement and connection of decoupling capacitors, etc.

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