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LM338-MIL データシート(PDF) 11 Page - Texas Instruments

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部品番号 LM338-MIL
部品情報  5-Amp Adjustable Regulators
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM338-MIL データシート(HTML) 11 Page - Texas Instruments

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Copyright © 2016, Texas Instruments Incorporated
TI DEVICE
OUT
REF
ADJ
R 2
V
= V
1+
+ I
R 2
R 2
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11
LM338-MIL
www.ti.com
SNVSAX2 – JUNE 2017
Product Folder Links: LM338-MIL
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
In operation, the LM338-MIL 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
with Equation 1.
(1)
Figure 15. Typical Application Circuit
Because the 50-µA current from the adjustment terminal represents an error term, the LM338-MIL 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 rises.


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