source:Industry News Popular:adapter release time:2022-04-21 11:06:20 Article author:yu
Design the input current source loop and input filter Design the output load loop and output filter According to the functional unit of the circuit, when laying out all the components of the circuit, the following principles should be followed:
1. First, consider the size of the PCB. When the PCB size is too large, the printed lines will be long, the impedance will increase, the anti-noise capability will decrease, and the cost will also increase; if the PCB size is too small, the heat dissipation will be poor, and the adjacent lines will be easily interfered. The optimal shape of the circuit board is a rectangle with an aspect ratio of 3:2 or 4:3. The components located on the edge of the circuit board are generally not less than 2mm away from the edge of the circuit board.
2. When placing the device, consider the subsequent soldering, not too dense.
3. Take the core components of each functional circuit as the center and make layout around it. Components should be evenly, neatly and compactly arranged on the PCB, minimize and shorten the leads and connections between components, and the decoupling capacitors should be as close as possible to the VCC of the device.
4. For circuits that work at high frequencies, the distribution parameters between components should be considered. In general circuits, the components should be arranged in parallel as much as possible. In this way, it is not only beautiful, but also easy to install and weld, and easy to mass produce.
5. Arrange the position of each functional circuit unit according to the circuit process, so that the layout is convenient for signal circulation, and the signal keeps the same direction as possible.
6. The first principle of layout is to ensure the routing rate of the wiring, pay attention to the connection of the flying wires when moving the device, and put the devices with the connection relationship together.
7. Reduce the loop area as much as possible to suppress the radiation interference of the switching power supply.
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