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LM317S/NOPB 数据表(PDF) 20 Page - Texas Instruments

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部件名 LM317S/NOPB
功能描述  LM117, LM317-N Wide Temperature Three-Pin Adjustable Regulator
PDF  51 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM317S/NOPB 数据表(HTML) 20 Page - Texas Instruments

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three LM195 devices in parallel
LM117
20
LM117, LM317-N
SNVS774Q – MAY 2004 – REVISED JUNE 2020
www.ti.com
Product Folder Links: LM117 LM317-N
Submit Documentation Feedback
Copyright © 2004–2020, Texas Instruments Incorporated
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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