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LM317T bảng dữ liệu(PDF) 11 Page - Texas Instruments

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LM317-N
( )
OUT
ADJ
R
V
= 1.25 V
I
R
R
2
2
1
1
æ
ö
+
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ç
÷
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LM117, LM317-N
www.ti.com
SNVS774P – MAY 2004 – REVISED OCTOBER 2015
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.
Copyright © 2004–2015, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Links: LM117 LM317-N


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