LM317SSLASHNOPB datasheet(20/51 Pages) TI

Part #	LM317S/NOPB

Description	LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator

PDF	51 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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20 / 51 page

three LM195 devices in parallel

LM117

LM117, LM317-N

SNVS774Q – MAY 2004 – REVISED JUNE 2020

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Product Folder Links: LM117 LM317-N

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Typical Applications (continued)

9.2.6 High-Current Adjustable Regulator

Using the LM195 power transistor in parallel with the LM117 can increase the maximum possible output load

current (see Figure 24). Sense resistor R1 provides the 0.6 V across base to emitter to turn on the PNP. This on

switch allows current to flow, and the voltage drop across R3 drives three LM195 power transistors designed to

carry an excess of 1 A each.

NOTE

The selection of R1 determines a minimum load current for the PNP to turn on. The higher

the resistor value, the lower the load current must be before the transistors turn on.

NOTE: ‡Optional—improves ripple rejection

†Solid tantalum

*Minimum load current = 30 mA

Figure 24. High-Current Adjustable Regulator

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