LM317SSLASHNOPB datasheet(21/51 Pages) TI

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

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21 / 51 page

LM117

LM117, LM317-N

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SNVS774Q – MAY 2004 – REVISED JUNE 2020

Product Folder Links: LM117 LM317-N

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Typical Applications (continued)

9.2.7 Emitter-Follower Current Amplifier

The LM117 is used as a constant current source in the emitter follower circuit (see Figure 25). The LM195 power

transistor is being used as a current gain amplifier, boosting the INPUT current. The LM117 provides a stable

current bias than just using a resistor.

Figure 25. Emitter-Follower Current Amplifier

9.2.8 1-A Current Regulator

A simple, fixed current regulator can be made by placing a resistor between the VOUT and ADJ pins of the LM117

(see Figure 26). By regulating a constant 1.25 V between these two terminals, a constant current is delivered to

the load.

Figure 26. 1-A Current Regulator

LM317S/NOPB Datasheet(PDF) 21 Page - Texas Instruments