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LM317S/NOPB bảng dữ liệu(PDF) 17 Page - Texas Instruments

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tên linh kiện LM317S/NOPB
Giải thích chi tiết về linh kiện  Wide Temperature Three-Pin Adjustable Regulator
PDF  48 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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LM317S/NOPB bảng dữ liệu(HTML) 17 Page - Texas Instruments

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LM117
LM117, LM317-N
www.ti.com
SNVS774P – MAY 2004 – REVISED OCTOBER 2015
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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Product Folder Links: LM117 LM317-N



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