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L6986ITR 数据表(PDF) 13 Page - STMicroelectronics |
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L6986ITR 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 60 page  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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