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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) 9 Page - STMicroelectronics |
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AN2689 датащи(HTML) 9 Page - STMicroelectronics |
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9 / 42 page  AN2689 Data line protection Doc ID 14310 Rev 3 9/42 3 Data line protection 3.1 Protection topologies 3.1.1 Clamping topology Various protection topologies can be chosen for data line protection. There is the usual topology that consists of using a clamping device as shown in Figure 6. The action of the suppressor upon positive and negative surge occurrence is shown respectively in Figure 7 and Figure 8. Figure 6. Data line protection using a Transil™ When a positive surge occurs, the over voltage is suppressed by the Transil as the voltage passes the breakdown voltage (VBR). Thus the current is diverted to ground. The remaining voltage on the data line is limited to the clamping voltage (Vcl). Figure 7. Positive surge suppression For the negative surge, the Transil is now in forward mode and the over voltage is eliminated as the surge voltage passes the forward voltage drop of the protection device (Vf). The remaining voltage is limited to the peak forward voltage of the Transil (Vfp). Figure 8. Negative surge suppression Module to protect Vnom Vmax Transil Module to protect Vnom Vmax Vs I Vcl Vcc Module to protect Vnom Vmax Vs I Vfp Vcc |
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