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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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A6986F Fiches technique(PDF) 18 Page - STMicroelectronics |
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A6986F Fiches technique(HTML) 18 Page - STMicroelectronics |
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18 / 72 page  Functional description A6986F 18/72 DocID027739 Rev 1 Figure 6. Soft-start phase with precharged COUT During 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 A6986F and perform the soft- start phase driven by an external voltage step, for example the signal from the ignition switch in automotive applications. Figure 7. Enable the device with external voltage step RUP RDWN CSS SS/INH I SS CH VSTEP Ignition switch 1 A typ in INHIBIT 4 Atyp in SS I SS DISCH UVLO Thermal shutdown = 600 Atyp |
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