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A6986F データシート(PDF) 18 Page - STMicroelectronics

部品番号 A6986F
部品情報  38 V 1.5 A synchronous step-down switching regulator
PDF  72 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6986F データシート(HTML) 18 Page - STMicroelectronics

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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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