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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) 33 Page - STMicroelectronics |
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AN2689 датащи(HTML) 33 Page - STMicroelectronics |
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33 / 42 page  AN2689 PCB layout recommendations Doc ID 14310 Rev 3 33/42 5 PCB layout recommendations Once the protection device has been selected, the designer has to pay attention to the device placement on the board. This is because the device placement has a big impact on protection efficiency and on parasitic electromagnetic coupling. 5.1 Parasitic inductances of the Transil and the PCB tracks 5.1.1 Parasitic inductance from Transil wiring Figure 45 provides an example of a protection schematic. Figure 45. Protection circuit schematic using a Transil Figure 46. shows what happens in the circuit when an over voltage occurs on the sensitive protected line. The over voltage surge is suppressed by the Transil. When the voltage reaches the breakdown voltage of the Transil, a current I crosses the protection device and a residual voltage V is applied at the module input line. Figure 46. Current and voltage at the Transil termination when a surge is applied This is the simple representation of the Transil action but in fact things are more complicated and the more realistic circuit is given in Figure 47. Module to protect Vnom Vmax Transil Sensitive line Module to protect Vnom Vmax Transil Sensitive line Vs I V |
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