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A6985F Scheda tecnica(PDF) 18 Page - STMicroelectronics

Il numero della parte A6985F
Spiegazioni elettronici  38 V 500 mA synchronous step-down switching regulator
PDF  77 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6985F Scheda tecnica(HTML) 18 Page - STMicroelectronics

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Functional description
A6985F
18/77
DocID027738 Rev 2
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 A6985F 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



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