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LM138QML bảng dữ liệu(PDF) 12 Page - Texas Instruments

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tên linh kiện LM138QML
Giải thích chi tiết về linh kiện  Military Grade 5-A Adjustable Output Linear Regulator
PDF  34 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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LM138QML bảng dữ liệu(HTML) 12 Page - Texas Instruments

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Copyright © 2017, Texas Instruments Incorporated
LM138QML
ADJ
VIN
VOUT
R1
R2
IADJ
I1
VREF
VOUT
R1
12
LM138QML
SNVSAA9 – OCTOBER 2017
www.ti.com
Product Folder Links: LM138QML
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 LM138QML device 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 of:
(1)
Because the 50-μA current from the adjustment terminal represents an error term, the LM138QML 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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