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LM317S/NOPB Datasheet(PDF) 17 Page - Texas Instruments

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Part # LM317S/NOPB
Description  LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator
PDF  51 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM317S/NOPB Datasheet(HTML) 17 Page - Texas Instruments

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LM317-N
17
LM117, LM317-N
www.ti.com
SNVS774Q – MAY 2004 – REVISED JUNE 2020
Product Folder Links: LM117 LM317-N
Submit Documentation Feedback
Copyright © 2004–2020, Texas Instruments Incorporated
Typical Applications (continued)
9.2.1.3 Application Curve
As shown in Figure 19, VOUT will rise with VIN minus some dropout voltage. This dropout voltage during startup
will vary with ROUT.
Figure 19. VOUT vs VIN, VOUT = 5V
9.2.2 5-V Logic Regulator With Electronic Shutdown
Figure 20 shows a variation of the 5-V output regulator application uses the L117 along with an NPN transistor to
provide shutdown control. The NPN will either block or sink the current from the ADJ pin by responding to the
TTL pin logic. When TTL is pulled high, the NPN is on and pulls the ADJ pin to GND, and the LM117 outputs
about 1.25 V. When TTL is pulled low, the NPN is off and the regulator outputs according to the programmed
adjustable voltage.
NOTE: Min. output
≊ 1.2 V
Figure 20. 5-V Logic Regulator With Electronic Shutdown



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