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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2846 датащи(PDF) 33 Page - STMicroelectronics |
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AN2846 датащи(HTML) 33 Page - STMicroelectronics |
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33 / 35 page  AN2846 Electromagnetic compatibility (EMC) requirements Doc ID 15130 Rev 1 33/35 6.3.2 Results on VC pin When a positive or negative surge voltage of 1 kV is applied on the supply resistor RC, the VC active clamp protects the SCLT3-8 input and limits the input voltage at 40 V. The current reaches 0.45 A. The wave shapes are similar to the previous ones as shown in Figure 43. Figure 43. VC behavior with RC = 2.2 kΩ 6.4 IEC 61000 4-6 This standard specifies the behavior of the device when subjected to conducted radio frequency interference in the range 150 kHz to 80 MHz. The RF signal, 80% modulated by 1 kHz sinusoidal waveform, is injected at the inputs IIN and VCC through a coupling device network (CDN). The required level defined into IEC 61131-2 is 3 V rms. With these stress conditions, the system must continue to operate with no loss of function (A criterion). The test configuration used is shown in Figure 44. Figure 44. RF test configuration SCLT3-8 meets IEC 61000 4-6 and IEC 61311-2 standards requirements. Better immunity can be obtained by decoupling pin SCK with a 470 pF capacitor. Vsurge VC IC +1kV 0.45A 40V 0.5kV/div 0.2A/div 20V/div Vsurge VC IC 0.45A -0.5kV/div 0.2A/div 1V/div 1V -1kV -1kV Positive voltage surge Negative voltage surge CWS500C V CC CDN-AF2 IN 1-8 V CC GND DUT Scope Reference plane -6 dB Vi |
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