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LM317HV Fiches technique(PDF) 9 Page - Texas Instruments

No de pièce LM317HV
Description  LMx17HV High Voltage Three-Terminal Adjustable Regulator With Overload Protection
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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LM317HV Fiches technique(HTML) 9 Page - Texas Instruments

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OUT
REF
ADJ
R
V
= V
I
R
R
2
2
1
1
æ
ö
+
+
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LM117HV, LM317HV
www.ti.com
SNVS773D – APRIL 2000 – REVISED SEPTEMBER 2015
8 Detailed Description
8.1 Overview
In operation, the LM317HV 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, since 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 13. Adjustable VOUT Through R1 and R2
Because the 100-
μA current from the adjustment terminal represents an error term, the LM317HV 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.
8.2 Functional Block Diagram
Copyright © 2000–2015, Texas Instruments Incorporated
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Product Folder Links: LM117HV LM317HV


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