LM317SSLASHNOPB datasheet(17/51 Pages) TI

Il numero della parte	LM317S/NOPB

Spiegazioni elettronici	LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator

PDF	51 Pages

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Produttore elettronici	TI [Texas Instruments]

Homepage	http://www.ti.com

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LM317-N

LM117, LM317-N

www.ti.com

SNVS774Q – MAY 2004 – REVISED JUNE 2020

Product Folder Links: LM117 LM317-N

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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

LM317S/NOPB Scheda tecnica(PDF) 17 Page - Texas Instruments