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L6986ITR 데이터시트(PDF) 13 Page - STMicroelectronics

부품명 L6986ITR
상세설명  38 V, 5 W synchronous iso-buck converter for isolated applications
PDF  60 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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L6986ITR 데이터시트(HTML) 13 Page - STMicroelectronics

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Figure 9. Soft-start phase
The CSS value is chosen accordingly with equation (1)
CSS = SSGAIN∙ISSCH∙TSS
VFB  =  3∙4μA∙TSS
0.85V
(1)
where TSS is the soft-start time, ISS CH the charging current and VFB the reference of the error amplifier.
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 ms time max. For complete and
proper capacitor discharge in case of fault conditions, a maximum CSS = 67 nF value is suggested.
In case the soft-start should be externally driven by a voltage step, the circuitry in figure below can be used.
L6986I
Soft-start and inhibit
DS13647 - Rev 1
page 13/60



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