LM317SSLASHNOPB datasheet(20/48 Pages) TI1

Part #	LM317S/NOPB

Description	Wide Temperature Three-Pin Adjustable Regulator

PDF	48 Pages

Scroll/Zoom	100%

Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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20 / 48 page

LM117

LM117, LM317-N

SNVS774P – MAY 2004 – REVISED OCTOBER 2015

www.ti.com

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

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LM317S/NOPB Datasheet(PDF) 20 Page - Texas Instruments