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L6985F 数据表(PDF) 16 Page - STMicroelectronics |
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L6985F 数据表(HTML) 16 Page - STMicroelectronics |
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16 / 65 page  Functional description L6985F 16/65 DocID027836 Rev 2 Figure 6. Soft-start phase with precharged COUT During the normal operation a new soft-start cycle takes place in case of: Thermal shutdown event UVLO event The device is driven in INH mode The soft-start capacitor is discharged with a 0.6 mA typ. current capability for 1 msec time max. For complete and proper capacitor discharge in case of fault condition, a maximum CSS = 67 nF value is suggested. The application example in Figure 7 shows how to enable the L6985F and perform the soft- start phase driven by an external voltage step. Figure 7. Enable the device with external voltage step |
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