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UM1693 数据表(PDF) 21 Page - STMicroelectronics |
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UM1693 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 196 page  DocID025505 Rev 1 21/196 UM1693 Reverse battery protection 195 Dimensioning of the GND resistor The GND resistor is recommended in case of a high inductive load. To determine if the resistor is needed or not, we need to know the demagnetization time (TDEMAG). The resistor is recommended if TDEMAG is higher than the standby delay time (tD_STBY). A typical tD_STBY value of 350 µs is considered in this comparison. TDEMAG can be determined by either measurement (Figure 6, RGND = 4.7 kΩ, Load: Relay 270 mH/ 90 Ω alternatively Bulb on a typical wire harness with 6 µH stray inductance) or calculation, using Equation 1 and Equation 2. Figure 4. Negative GND shift (TDEMAG > tD_STBY) Equation 1 Equation 2 V DEMAG V BAT V CLAMP – = T DEMAG L R ---- ln V DEMAG I 0 R ⋅ + V DEMAG ----------------------------------------------- ⋅ = |
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