11. The design of PCB (multiple layer board)--Basic requirement of designing multiple layer PCB VOL3
Requirements of power layer, stratigraphic partition and flow-hole: Juvtmall ( a company supply PCB Prototyping , PCBA service and sell kinds of components, modules and so on) For PCB multilayer, there is at least one power layer and one layer. Because of all the voltage on the PCB are in the same power level, so you have to partition the isolation of power supply layer, the size of the partition line generally USES 20 ~ 80 mil line width advisable, ultra-high voltage, the more coarse partition line. In order to increase the reliability of the welding hole and the power supply layer and the stratigraphic connection, it is necessary to design the shape of the flower hole to reduce the large area metal heat absorption in the welding process The aperture of the isolation pad is greater than that of borehole aperture +20mil Requirements for safe spacing The setting of safety spacing should meet th...
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