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LM138KG-MW8 Datenblatt(PDF) 10 Page - Texas Instruments

Teilenummer LM138KG-MW8
Bauteilbeschribung  Military Grade 5-A Adjustable Output Linear Regulator
Download  34 Pages
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM138KG-MW8 Datenblatt(HTML) 10 Page - Texas Instruments

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ADJ
VOUT
Q24
R26
0.03
R25
3
R24
160
R22
160
R23
18 k
R20
13 k
R21
400
R18
130
R19
370
R16
6.7 k
R17
12 k
Q25
Q26
Q21
Q20
Q18
Q16
C3
5 pF
R14
12 k
R15
2.4 k
Q21
D2
6.3 V
D3
6.3 V
VIN
Q19
Q17
Q15
Q14
Q13
Q12
Q11
Q9
Q7
Q5
Q3
R13
5.1 k
R12
72
R11
5.8 k
R10
4.1 k
R9
180
R7
130
R27
4 k
R8
12.4 k
6 V
Q10
Q8
Q4
Q1
Q2
R1
310
R2
310
R3
190
R4
82
R5
5.6 k
R6
200 k
Q6
C1
30 pF
C2
30 pF
Q27
D1
6.3 V
Copyright © 2017, Texas Instruments Incorporated
10
LM138QML
SNVSAA9 – OCTOBER 2017
www.ti.com
Product Folder Links: LM138QML
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
The LM138QML device is an adjustable, three-terminal, positive-voltage regulator capable of supplying more
than 5 A over an output-voltage range of 1.2 V to 32 V. It requires only two external resistors to set the output
voltage. The LM138QML device features a typical line regulation of 0.005% and typical load regulation of 0.1%. It
includes time-dependent current limiting, thermal overload protection, and safe operating area protection.
Overload protection remains functional even if the ADJUST terminal is disconnected.
The LM138QML devices are versatile in their applications, including uses in programmable output regulation and
local on-card regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the
LM138QML device can function as a precision current regulator. An optional output capacitor can be added to
improve transient response. The ADJUST terminal can be bypassed to achieve very high ripple-rejection ratios,
which are difficult to achieve with standard three-terminal regulators.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 NPN Darlington Output Drive
NPN Darlington output topology provides naturally low output impedance and an output capacitor is optional. To
support maximum current and lowest temperature, 3-V headroom is recommended (VI – VO).
7.3.2 Overload Block
Overcurrent and overtemperature shutdown protects the device against overload or damage from operating in
excessive heat.
7.3.3 Programmable Feedback
An op amp with 1.25-V offset input at the ADJUST terminal provides easy output voltage or current, but not both,
programming. For current regulation applications, a single resistor whose resistance value is 1.25 V/IO and power
rating is greater than 1.25 V2/R must be used. For voltage regulation applications, two resistors set the output
voltage.


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