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L9678P データシート(PDF) 30 Page - STMicroelectronics |
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L9678P データシート(HTML) 30 Page - STMicroelectronics |
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30 / 203 page  Start-up power control L9678P, L9678P-S 30/203 DocID029274 Rev 3 4.3.3 ER switch and COVRACT pin L9678P has an integrated circuit that can operate as a crossover switch with Rds(on) = 1.5 Ω nominal. The ER switch is automatically activated upon entering the PASSIVE mode. Voltage difference between VIN and VER is monitored in order to prevent VER back-feeding when VIN exceeds VER by 0.1V max. The ER switch is automatically deactivated upon the above mentioned overvoltage detection. The ER control implements a thermal protection and a current limitation guard to avoid in-rush charge current at ER switch enabling or at fault condition for short to ground. During PASSIVE mode the discrete digital output pin COVRACT is activated to allow for external optional cross-over switch control. Figure 13. ER switch control behaviour |
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