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L6985F bảng dữ liệu(PDF) 14 Page - STMicroelectronics

tên linh kiện L6985F
Giải thích chi tiết về linh kiện  Internal current limiting
PDF  65 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L6985F bảng dữ liệu(HTML) 14 Page - STMicroelectronics

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Functional description
L6985F
14/65
DocID027836 Rev 2
Figure 4. Internal circuit
4.3
Soft-start and inhibit
The soft-start and inhibit features are multiplexed on the same pin. An internal current
source charges the external soft-start capacitor to implement a voltage ramp on the SS/INH
pin. The device is inhibited as long as the SS/INH pin voltage is lower than the VINH
threshold and the soft-start takes place when the SS/INH pin crosses VSS START. (See
Figure 5).
The internal current generator sources a 1 A typ. current when the voltage of the VCC pin
crosses the UVLO threshold. The current increases to 4
A typ. as soon as the SS/INH
voltage is higher than the VINH threshold. This feature helps to decrease the current
consumption in inhibit mode. An external open collector can be used to set the inhibit
operation clamping the SS/INH voltage below the VINH threshold.
The startup feature minimizes the inrush current and decreases the stress of the power
components during the power-up phase. The ramp implemented on the reference of the
error amplifier has a gain three times higher (SSGAIN) than the external ramp present at the
SS/INH pin.



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