To get the best PCB component layout for your LED switching power supply, the first thing you need to do before designing the component layout is to fully consider the PCB size. When the PCB size in the switching power supply is too large, the printed wiring will be too long, which will increase the impedance and reduce the noise resistance, and the cost will increase accordingly. However, if the printed circuit board is too small, the heat dissipation is not good, and the adjacent lines are susceptible to interference. Generally speaking, the best shape of the pcb circuit board of the LED switching power supply is rectangular, and the aspect ratio is 3:2 or 4:3, which is located at the edge of the circuit board. Components are generally not less than 2mm from the edge of the board.
After completing the PCB size design, we also need to consider the distribution parameters between the components, this is It is especially important for circuits that operate under high frequency conditions. The general circuit should arrange the components in parallel as much as possible, so that it is not only beautiful, but also easy to solder and easy to mass produce.
In the process of pcb When placing the components of the board, do not blindly seek for it. At this time, it is necessary to comprehensively consider the future welding problems. This requires the engineer to rationally arrange the components, not to be too dense between the components. In the design process In the middle, the engineer should focus on the core components of each functional circuit and carry out the overall component layout around the core components. During the layout process, the components should be evenly, neatly and compactly arranged on the PCB, minimizing and shortening. The leads and connections between the components, decoupling capacitors should be as close as possible to the VCC of the device.
In addition, when laying out the PCB component layout of the LED switching power supply,Engineers are advised to arrange the position of each functional circuit unit according to the flow of the circuit. This layout allows the signal to flow more efficiently and quickly, and keeps the signal as consistent as possible. In the layout of the PCB board, the first principle is to ensure the routing rate of the wiring, pay attention to the connection of the flying line when moving the device, and put the devices with the wiring relationship together. Reduce the loop area as much as possible to suppress radiated interference from the switching power supply.