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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2689 датащи(PDF) 37 Page - STMicroelectronics |
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AN2689 датащи(HTML) 37 Page - STMicroelectronics |
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37 / 42 page  AN2689 PCB layout recommendations Doc ID 14310 Rev 3 37/42 5.1.2 Capacitive and inductive coupling The parasitic capacitance (see Figure 47) is due to the geometrical conception of the PCB and the routing together. Figure 55 shows the effective capacitive coupling during surge suppression. Figure 55. Capacitive coupling representation This parasitic capacitance depends on the PCB and track structures as shown in Figure 56 and Figure 57. This parasitic capacitance is defined by the space between tracks, the track width and the PCB thickness as well. Figure 56. Double side PCB structure in coplanar Figure 57. Track to track capacitance for double side PCB (source AEMC) The longer is the line to the protection device, the higher will be the capacitive coupling. Vsurge V C εr=4.5 d w h Capacitance (pF/cm) 1 0.1 0.01 0.001 0.3 0.03 0.003 0.1 0.3 1 3 10 30 h / w = 0.3 h / w = 0.5 h / w = 1 h / w = 2 h / w = 5 h / w = 10 d/h |
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