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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM317S/NOPB датащи(PDF) 17 Page - Texas Instruments |
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LM317S/NOPB датащи(HTML) 17 Page - Texas Instruments |
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17 / 48 page  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 Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Links: LM117 LM317-N |
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