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VIPER20 数据表(PDF) 16 Page - STMicroelectronics |
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VIPER20 数据表(HTML) 16 Page - STMicroelectronics |
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16 / 25 page  16/25 VIPer20/SP/DIP - VIPer20A/ASP/ADIP Figure 22: Input Voltage Surges Protection ELECTRICAL OVER STRESS RUGGEDNESS The VIPer may be submitted to electrical over stress caused by violent input voltage surges or lightning. Following the enclosed Layout Considerations chapter rules is the most of the time sufficient to prevent catastrophic damages, however in some cases the voltage surges coupled through the transformer auxiliary winding can overpass the VDD pin absolute maximum rating voltage value. Such events may trigger the VDD internal protection circuitry which could be damaged by the strong discharge current of the VDD bulk capacitor. The simple RC filter shown in figure 22 can be implemented to improve the application immunity to such surges. C1 Bulk capacitor D1 R1 (Optional) C2 22nF Auxilliary winding 13V OSC COMP SOURCE DRAIN VDD - + VIPerXX0 R2 39R |
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