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LM317S/NOPB Datasheet(PDF) 12 Page - Texas Instruments

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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
Logo TI - Texas Instruments

LM317S/NOPB Datasheet(HTML) 12 Page - Texas Instruments

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LM317-N
( )
OUT
ADJ
R
V
= 1.25 V
I
R
R
2
2
1
1
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12
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
8 Detailed Description
8.1 Overview
In operation, the LM317-N develops a nominal 1.25-V reference voltage, VREF, between the output and
adjustment terminal. The reference voltage is impressed across program resistor R1 and, because the voltage is
constant, a constant current I1 then flows through the output set resistor R2, giving an output voltage calculated
by Equation 1:
(1)
Figure 15. Setting the VOUT Voltage
Because the 100-μA current from the adjustment terminal represents an error term, the LM317-N was designed
to minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current
is returned to the output establishing a minimum load current requirement. If there is insufficient load on the
output, the output will rise.



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