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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ISO8200BQ датащи(PDF) 26 Page - STMicroelectronics |
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ISO8200BQ датащи(HTML) 26 Page - STMicroelectronics |
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26 / 37 page  Reverse polarity protection ISO8200BQ 26/37 DocID027303 Rev 4 8 Reverse polarity protection Reverse polarity protection can be implemented on board using two different solutions: 1. Placing a resistor (RGND) between IC GND pin and load GND 2. Placing a diode between IC GND pin and load GND If option 1 is selected, the minimum resistance value has to be selected according to the following equation: RGND ≥ VCC/IGNDcc where IGNDcc is the DC reverse ground pin current and can be found in Section 3: "Absolute maximum ratings" of this datasheet. Power dissipated by RGND during reverse polarity situations is: PD = (VCC)2/RGND If option 2 is selected, the diode has to be chosen by taking into account VRRM >|VCC| and its power dissipation capability: PD ≥ IS*VF In normal conditions (no reverse polarity) due to the diode, there is a voltage drop between GND of the device and GND of the system. Figure 19: Reverse polarity protection This schematic can be used with any type of load. |
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