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LM317S/NOPB bảng dữ liệu(PDF) 18 Page - Texas Instruments

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tên linh kiện LM317S/NOPB
Giải thích chi tiết về linh kiện  LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator
PDF  51 Pages
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nhà sản xuất  TI [Texas Instruments]
Trang chủ  http://www.ti.com
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LM317S/NOPB bảng dữ liệu(HTML) 18 Page - Texas Instruments

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LM117
18
LM117, LM317-N
SNVS774Q – MAY 2004 – REVISED JUNE 2020
www.ti.com
Product Folder Links: LM117 LM317-N
Submit Documentation Feedback
Copyright © 2004–2020, Texas Instruments Incorporated
Typical Applications (continued)
9.2.3 Slow Turnon 15-V Regulator
An application of LM117 includes a PNP transistor with a capacitor to implement slow turnon functionality (see
Figure 21). As VIN rises, the PNP sinks current from the ADJ rail. The output voltage at start up is the addition of
the 1.25-V reference plus the drop across the base to emitter. While this is happening, the capacitor begins to
charge and eventually opens the PNP. At this point, the device functions normally, regulating the output at 15 V.
A diode is placed between C1 and VOUT to provide a path for the capacitor to discharge. Such controlled turnon
is useful for limiting the in-rush current.
Figure 21. Slow Turnon 15-V Regulator



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