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STPIC44L02 датащи(PDF) 14 Page - STMicroelectronics |
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STPIC44L02 датащи(HTML) 14 Page - STMicroelectronics |
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14 / 21 page ![]() STPIC44L02 14/21 Figure 15 : Normal Operation Figure 16 : Shorted Load Condition (Deglitch Time) OPEN LOAD The STPiC44L02 monitors the drain of each power FET for open circuit conditions that may exist. The 60 µA current source is provided to monitor open load fault conditions. Open-load faults are only detected when the power FET is turned off. When load impedance is open or substantially high, the 60µA current source has adequate drive to pull the drain of T1 below the fault reference threshold on the detection circuit. Unused DRAIN0-DRAIN3 inputs must be connectedtoVBAT through a pull-up resistor to prevent false reporting of open-load fault conditions. The on-board deglitch timer starts running when the STPiC44L02, gate output to the power FET transitates to the off state. The timer provides a 60ms deglitch time, T(STBFM),to allow the drain voltage to stabilize after the powerFET has been turned off. The deglitch time is only enabled for the first 60ms after the FET has been |
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