As a new member of switching power supply family, currently, LED switching power supply has been applied widely in many fields. In the R&D of new products, layout of PCB components is the most important part in designing LED switching power and a key test for engineers in designing the schemes as well. Then, what should we do achieve the best effects in the layout of PCB components? To achieve the best OCB components layout for the LED switching power supply, the first point which deserves full attention is the size of PCB before designing the layout of PCB components. When the size of PCB is too large, the printing wires will have to bee very long, leading to an increase in the impedance and a reduction in noise immunity, as well as a rising cost. In addition, once the printing wires are too long, neighbouring wires will be easily disturbed. Generally, the best shape for a PCB universal for the LED switching power is rectangle, with a proportion of 3:2 or 4:3 in length and width and the distance for components in the edge of the board should be no less than 2mm from the edge. After finishing the design of PCB size, the next step is to think about parameters distribution among the components, which is particularly important to circuits working in a high-frequency environment. Generally, circuits should be best arranged in parallel, which is not only beautiful, but also easy to be welded and to proceed mass production as well.
When placing components in the PCB Quote board, you should never be too rash but to consider about the following welding issues, which requires engineers to lay out components in a reasonable way but not make them too concentrated. In the process of design, engineers should consider the key component of every functional circuit as the core and make integrated layout of the components centering on core components. In the process of layout, components should arranged on the PCB in an even, orderly and compact way; leads and connective lines between the components should reduced and shortened to the minimum extent; decoupling capacitor should be near to the component’s VCC.
Besides, in laying out PCB components of LED switching power supply, it is suggested that engineers should arrange the position of every functional circuit based on the procedure of the circuits. This kind of layout will will the signal flow more effectively and rapidly and make the signals maintain the same direction. In laying out PCB board, the first principle is to ensure routing rate; connection between the flying lines should also be paid special attention; components connected with wires should be put together. The size of loop should be reduced to the minimum extend to stop radiated disturbance of the switching power.
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