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L6986 数据表(PDF) 33 Page - STMicroelectronics |
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L6986 数据表(HTML) 33 Page - STMicroelectronics |
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33 / 68 page  DocID025376 Rev 7 33/68 L6986 Functional description 68 generates an overvoltage event. This can be considered as an example for a system with dynamic performance not in line with the load request. The L6986 device implements a 1 A typ. negative current limitation to limit the maximum reversed switch current during the overvoltage operation. Figure 23. Overvoltage operation 4.9 Thermal shutdown The shutdown block disables the switching activity if the junction temperature is higher than a fixed internal threshold (165 °C typical). The thermal sensing element is close to the power elements, ensuring fast and accurate temperature detection. A hysteresis of approximately 30 °C prevents the device from turning ON and OFF continuously. When the thermal protection runs away a new soft-start cycle will take place. |
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