LM317SSLASHNOPB datasheet(19/48 Pages) TI1

部品番号	LM317S/NOPB

部品情報	Wide Temperature Three-Pin Adjustable Regulator

PDF	48 Pages

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メーカー	TI1 [Texas Instruments]

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three LM195 devices in parallel

LM117

LM117, LM317-N

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SNVS774P – MAY 2004 – REVISED OCTOBER 2015

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

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LM317S/NOPB データシート(PDF) 19 Page - Texas Instruments