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L6986 Datasheet(PDF) 17 Page - STMicroelectronics

No. de pieza L6986
Descripción Electrónicos  38 V, 2 A synchronous step-down switching regulator with 30 A quiescent current
PDF  68 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986 Datasheet(HTML) 17 Page - STMicroelectronics

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DocID025376 Rev 7
17/68
L6986
Functional description
68
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 L6986 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
ISS CH
VSTEP
Ignition switch
1 A typ in INHIBIT
4 Atyp in SS
ISS DISCH
UVLO
Thermal shutdown
= 600 Atyp



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