LM138KG-MD8 [TI]
LM138QML | Y | 0 | -55 to 125;型号: | LM138KG-MD8 |
厂家: | TEXAS INSTRUMENTS |
描述: | LM138QML | Y | 0 | -55 to 125 输出元件 调节器 |
文件: | 总35页 (文件大小:1143K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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LM138QML
ZHCSH04 –OCTOBER 2017
LM138QML 军用级 5A 可调输出线性稳压器
1 特性
LM138QML 器件的一项独特功能是可提供基于时间的
电流限制。电流限制电路支持稳压器在较短的时间内牵
引高达 12A 的峰值电流。因此,LM138QML 器件能够
在高瞬态负载下使用,并且可加快满载条件下的启动速
度。在持续负载条件下,电流限制会降至安全的值,以
保护稳压器。此外,芯片中还包含热过载保护和安全区
域保护功能(针对功率晶体管)。即使调节引脚意外断
开,过载保护功能仍然起作用。
1
•
•
•
•
•
•
•
•
•
按照德州仪器 (TI) 军用级流程进行制造和测试
额定峰值输出电流为 7A
额定输出电流为 5A
宽温度范围:-55°C 至 150°C
低至 1.2V 的可调节输出
额定热调节
电流限制在各种温度下保持恒定
已通过 P+ 产品增强性能测试
输出具有短路保护
通常不需要使用电容器,除非器件的位置距离输入滤波
电容器超过 6 英寸,此时需要使用输入旁路。可以添
加输出电容器以改善瞬态响应,而旁路掉调节引脚可提
高稳压器的纹波抑制能力。
2 应用
•
•
•
可调节电源
除了替代固定稳压器或分立式设计之外,LM138QML
也可应用于各种其他 应用。由于该稳压器属于“浮动型”
稳压器,并且仅接收输入到输出差分电压,因此,只要
不超过最大输入到输出差分电压,就可以调节几百伏特
的电源电压;换而言之,不会让输出发生接地短路故
障。
恒定电流稳压器
电池充电器
3 说明
LM138QML 可调节 3 端子正电压稳压器能够在 1.2V
至 32V 输出范围内提供超过 5A 的电流。该器件极易
使用,并且仅需要 2 个电阻器即可设置输出电压。电
路设计精心细致,可实现出色的负载和线路调节,并且
可与许多商用电源相媲美。
器件信息(1)
器件型号
LM138K-MIL
等级
封装
军用
军用
军用
TO-3 (2)
裸片
LM138KG-MD8
LM138KG-MW8
晶圆
(1) 如需了解所有可用封装,请参阅数据表末尾的可订购产品附
录。
典型应用电路
LM138QML
VOUT
VIN
I1
VREF
ADJ
R1
R2
VOUT
IADJ
Copyright © 2017, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
English Data Sheet: SNVSAA9
LM138QML
ZHCSH04 –OCTOBER 2017
www.ti.com.cn
目录
7.4 Device Functional Modes........................................ 11
Application and Implementation ........................ 12
8.1 Application Information............................................ 12
8.2 Typical Applications ................................................ 13
8.3 System Examples ................................................... 17
Power Supply Recommendations...................... 29
1
2
3
4
5
6
特性.......................................................................... 1
8
9
应用.......................................................................... 1
说明.......................................................................... 1
修订历史记录 ........................................................... 2
Pin Configuration and Functions......................... 3
Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 Recommended Operating Conditions....................... 4
6.3 Thermal Information.................................................. 5
6.4 Electrical Characteristics........................................... 5
6.5 Quality Conformance Inspection............................... 6
6.6 Typical Performance Characteristics ........................ 7
Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
10 Layout................................................................... 29
10.1 Layout Guidelines ................................................. 29
10.2 Layout Example .................................................... 29
11 器件和文档支持 ..................................................... 30
11.1 接收文档更新通知 ................................................. 30
11.2 社区资源................................................................ 30
11.3 商标....................................................................... 30
11.4 静电放电警告......................................................... 30
11.5 Glossary................................................................ 30
12 机械、封装和可订购信息....................................... 30
7
4 修订历史记录
日期
修订版本
说明
2017 年 10 月
*
初始发行版
2
Copyright © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
5 Pin Configuration and Functions
K Package
2-Pin TO-3
Bottom View
VIN
ADJUSTMENT
CASE IS
OUTPUT
Package Number K0002C
Pin Functions
PIN
I/O
DESCRIPTION
NAME
ADJ
NO.
1
I
I
Output voltage adjustment pin. Connect to a resistor divider to set VO.
VIN
2
Supply input pin.
VOUT
Case
O
Voltage output pin.
Copyright © 2017, Texas Instruments Incorporated
3
LM138QML
ZHCSH04 –OCTOBER 2017
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)
MIN
MAX
UNIT
Power dissipation
Internally limited
Input and output voltage differential
Storage temperature, Tstg
–0.3
–65
40
V
150
300
°C
°C
Lead temperature (soldering, 10 seconds)
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
6.2 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
–55
3
MAX
150
40
UNIT
°C
V
Operating temperature, TJ
Input-to-output voltage differential
Output current
5
A
4
Copyright © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
6.3 Thermal Information
LM138QML
THERMAL METRIC(1)
K (TO-3)
2 PINS
42.8
UNIT
RθJA
RθJC(top)
ψJT
Junction-to-ambient thermal resistance
°C/W
°C/W
°C/W
°C/W
Junction-to-case (top) thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
3.3
2.5
ψJB
37.4
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
6.4 Electrical Characteristics
Values apply for VIN – VOUT = 5 V; and IOUT = 10 mA (unless otherwise noted)(1)
SUB-
PARAMETER
TEST CONDITIONS
VIN – VOUT = 3 V(3)
MIN
TYP(2)
MAX UNIT
GROUPS
[1, 2, 3]
[1, 2, 3]
[1, 2, 3]
[1, 2, 3]
[1, 2, 3]
[1]
1.19
1.19
1.19
1.19
1.19
–3.5
–14
1.29
1.29
VIN – VOUT = 3 V, IOUT = 5 A
VIN – VOUT = 5 V, IOUT = 7 A
VIN – VOUT = 35 V
VREF
Reference voltage
1.29
1.29
1.29
3.5
V
VIN – VOUT = 35 V, IOUT = 150 mA
3 V ≤ (VIN – VOUT) ≤ 35 V
3.3 V ≤ (VIN – VOUT) ≤ 35 V
VRLINE
Line regulation(4)
Load regulation(4)
mV
[2, 3]
14
VIN – VOUT = 3 V, 10 mA ≤ IOUT ≤ 5 A,
VOUT = VREF
[1]
–3.8
–8
3.8
8
VIN – VOUT = 3.3 V, 10 mA ≤ IOUT ≤ 5 A,
VOUT = VREF
[2, 3]
VRLOAD
mV
[1]
–3.8
–8
3.8
8
VIN – VOUT = 35 V, 10 mA ≤ IOUT ≤ 150
mA, VOUT = VREF
[2, 3]
VIN – VOUT = 10 V, pulse = 20 ms,
IOUT = 1 A(5)
VIN – VOUT = 3 V(3)
VRTH
IADJ
Thermal regulation
[1]
0.002
45
0.01 %/W
[1, 2, 3]
[1, 2, 3]
[1, 2, 3]
[1, 2, 3]
[1, 2, 3]
[1, 2, 3]
2
2
100
μA
Adjustment pin current
VIN – VOUT = 35 V
3 V ≤ (VIN – VOUT) ≤ 35 V(3)
100
–5
–5
0.5
0.5
0.2
3.5
5
ΔIADJ
Adjustment pin current change
μA
5
10 mA ≤ IOUT ≤ 5 A
VIN – VOUT = 3 V, VOUT = 1.4 V(3)
VIN – VOUT = 35 V, VOUT = 1.4 V
5
ILOAD(MIN) Minimum load current
mA
5
VIN – VOUT = 10 V, T = 0.5 ms,
VOUT = 0 V
[1, 2, 3]
[1, 2, 3]
[4]
7
5
16
A
ICL
Current limit
T = 5 ms, VOUT = 0 V
15
VOUT = VREF, eIN = 1 VRMS, f = 120 Hz,
IOUT = 500 mA(6)
ΔVR/ΔVIN Ripple rejection ratio
60
dB
(1) These specifications are applicable for power dissipations up to 50W. Power dissipation is specified at these values up to 15-V input-
output differential. Above 15-V differential, power dissipation will be limited by internal protection circuitry. All limits (that is, the numbers
in the minimum and maximum columns) are specified to TI's AOQL (Average Outgoing Quality Level).
(2) Typical figures are at TA = 25°C, and represent most likely parametric norms. Test limits are ensured to Texas Instruments' average
outgoing quality level (AOQL).
(3) VIN – VOUT = 3.3 V at –55°C and 125°C.
(4) Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to
heating effects are covered under the specifications for thermal regulation.
(5) Datalog reading in mV, 0.01% = 1.19 mV.
(6) Family board not required for this device.
版权 © 2017, Texas Instruments Incorporated
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ZHCSH04 –OCTOBER 2017
www.ti.com.cn
6.5 Quality Conformance Inspection
MIL-STD-883, Method 5005 - Group A
SUBGROUP
DESCRIPTION
Static tests at
TEMPERATURE (°C)
1
2
25
125
–55
25
Static tests at
3
Static tests at
4
Dynamic tests at
Dynamic tests at
Dynamic tests at
Functional tests at
Functional tests at
Functional tests at
Switching tests at
Switching tests at
Switching tests at
Setting time at
5
125
–55
25
6
7
8A
8B
9
125
–55
25
10
11
12
13
14
125
–55
25
Setting time at
125
–55
Setting time at
6
版权 © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
6.6 Typical Performance Characteristics
图 1. Current Limit
图 2. Current Limit
图 3. Current Limit
图 4. Load Regulation
图 6. Adjustment Current
图 5. Dropout Voltage
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7
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ZHCSH04 –OCTOBER 2017
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Typical Performance Characteristics (接下页)
图 7. Temperature Stability
图 8. Output Impedance
图 10. Ripple Rejection
图 9. Minimum Operating Current
图 11. Ripple Rejection
图 12. Ripple Rejection
8
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LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
Typical Performance Characteristics (接下页)
图 13. Line Transient Response
图 14. Load Transient Response
版权 © 2017, Texas Instruments Incorporated
9
LM138QML
ZHCSH04 –OCTOBER 2017
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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
VIN
R1
310
R2
310
R3
190
R4
82
R5
5.6 k
Q21
Q10
R19
370
Q25
R18
130
D2
6.3 V
R16
6.7 k
R17
12 k
Q4
Q8
Q1
Q14
Q18
Q2
Q26
Q20
Q27
Q16
R6
200 k
C3
5 pF
R23
18 k
R21
400
Q13
R27
4 k
R22
160
R8
12.4 k
Q21
Q15
R20
13 k
R7
130
D3
6.3 V
Q9
Q19
Q24
Q17
Q6
D1
6.3 V
Q7
Q11 Q12
C1
30 pF
R15
2.4 k
Q3
Q5
R24
160
C2
30 pF
R9
180
R10
4.1 k
R13
5.1 k
R11
5.8 k
R12
72
R14
12 k
R25
3
R26
0.03
VOUT
ADJ
6 V
Copyright © 2017, Texas Instruments Incorporated
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.
10
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LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
7.4 Device Functional Modes
7.4.1 Normal Operation
The device OUTPUT pin sources current necessary to make the OUTPUT pin 1.25-V greater than the ADJUST
terminal to provide output regulation.
7.4.2 Operation With Low Input Voltage
The device requires up to 3-V headroom (VI – VO) to operate in regulation. With less headroom, the device may
drop out and the OUTPUT voltage is then the INPUT voltage minus the drop out voltage.
7.4.3 Operation at Light Loads
The device passes its bias current to the OUTPUT pin. The load or feedback must consume this minimum
current for regulation or the output may be too high. A 250-Ω feedback resistor between OUTPUT and ADJUST
consumes the worst case minimum load current of 5 mA.
7.4.4 Operation in Self Protection
When an overload occurs, the device shuts down the Darlington NPN output stage or reduces the output current
to prevent device damage. The device automatically resets from the overload. The output may be reduced or
alternate between on and off until the overload is removed.
版权 © 2017, Texas Instruments Incorporated
11
LM138QML
ZHCSH04 –OCTOBER 2017
www.ti.com.cn
8 Application and Implementation
注
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:
R1
(1)
LM138QML
VOUT
VIN
I1
VREF
ADJ
R1
R2
VOUT
IADJ
Copyright © 2017, Texas Instruments Incorporated
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.
12
版权 © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
8.2 Typical Applications
8.2.1 Constant 5-V Regulator
D1**
1N4002
LM138QML
VIN
VOUT
††
VIN
VOUT
ADJ
R1
270ꢀ
D2†*
1N4002
†
COUT
CIN*
0.1…F
1…F
CADJ
10…F
R2
820ꢀ
GND
*Needed if device is more than 6 inches from filter
capacitors
†Optionalœœimproves transient response
**Recommended if COUT is used
R 2
R1
≈
«
’
÷
◊
††
VOUT = 1.25V 1 +
+ I
(
R 2
)
∆
ADJ
†*Recommended if CADJ is used
Copyright © 2017, Texas Instruments Incorporated
图 15. Constant 5-V Regulator
8.2.1.1 Design Requirements
表 1. Design Parameters
PART
NUMBER/VALUE
PARAMETER
DESCRIPTION
The LM138QML produces a typical 1.24-V potential between the OUTPUT and ADJUST
pins; therefore, placing a 270-Ω resistor between the OUTPUT and ADJUST pins causes
4.6 mA to flow through R1 and R2
Feedback resistor 1 (R1)
Feedback resistor 2 (R2)
270 Ω
To achieve a 5-V output, the sum of the voltages across R1 and R2 must equal 5 V.
Therefore, VR2 must equal 3.76 V when 4.6 mA is flowing through it. R2 = VR2 / I = 3.76 V
/ 4.6 mA = ~820 Ω.
820 Ω
0.1 µF of input capacitance helps filter out unwanted noise, especially if the regulator is
located far from the power supply filter capacitors.
Input capacitor (CIN
Output capacitor (COUT
Adjust capacitor (CADJ
)
0.1 µF
1 µF
The regulator is stable without any output capacitance, but adding a 1-µF capacitor
improves the transient response.
)
A 10-µF capacitor bypassing the ADJUST pin to ground improves the regulators ripple
rejection.
)
10 µF
Protection diode D1 is recommended if COUT is used. The diode provides a low-
impedance discharge path to prevent the capacitor from discharging into the output of the
regulator (see Protection Diodes).
Protection diode 1 (D1)
Protection diode 2 (D2)
1N4002
1N4002
Protection diode D2 is recommended if CADJ is used. The diode provides a low-impedance
discharge path to prevent the capacitor from discharging into the output of the regulator
(see Protection Diodes).
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ZHCSH04 –OCTOBER 2017
www.ti.com.cn
8.2.1.2 Detailed Design Procedure
8.2.1.2.1 External Capacitors
An input bypass capacitor is recommended. A 0.1-μF disc or 1-μF solid tantalum on the input is suitable input
bypassing for almost all applications. The device is more sensitive to the absence of input bypassing when
adjustment or output capacitors are used but the above values will eliminate the possibility of problems.
The adjustment terminal can be bypassed to ground on the LM138QML to improve ripple rejection. This bypass
capacitor prevents ripple from being amplified as the output voltage is increased. With a 10-μF bypass capacitor,
75-dB ripple rejection is obtainable at any output level. Increases over 20 μF do not appreciably improve the
ripple rejection at frequencies above 120 Hz. If the bypass capacitor is used, it is sometimes necessary to
include protection diodes to prevent the capacitor from discharging through internal low current paths and
damaging the device.
In general, the best type of capacitors to use are solid tantalum. Solid tantalum capacitors have low impedance
even at high frequencies. Depending upon capacitor construction, it takes about 25 μF in aluminum electrolytic to
equal 1-μF solid tantalum at high frequencies. Ceramic capacitors are also good at high frequencies; however,
some types have a large decrease in capacitance at frequencies around 0.5 MHz. For this reason, a 0.01-μF disc
may seem to work better than a 0.1-μF disc as a bypass.
Although the LM138QML is stable with no output capacitors, like any feedback circuit, certain values of external
capacitance can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1-μF solid
tantalum (or 25-μF aluminum electrolytic) on the output swamps this effect and insures stability.
8.2.1.2.2 Load Regulation
The LM138QML device is capable of providing extremely good load regulation but a few precautions are needed
to obtain maximum performance. The current set resistor connected between the adjustment terminal and the
output terminal (usually 240 Ω) should be tied directly to the output of the regulator (case) rather than near the
load; this eliminates line drops from appearing effectively in series with the reference and degrading regulation.
For example, a 15-V regulator with 0.05-Ω resistance between the regulator and load will have a load regulation
due to line resistance of 0.05 Ω × IL. If the set resistor is connected near the load the effective line resistance will
be 0.05 Ω (1 + R2/R1) or in this case, 11.5 times worse.
图 16 shows the effect of resistance between the regulator and 240-Ω set resistor.
LM138QML
RS
VIN
VOUT
VIN
VOUT
ADJ
R1*
240
R2
Copyright © 2017, Texas Instruments Incorporated
图 16. Regulator With Line Resistance in Output Lead
With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor by using two
separate leads to the case. The ground of R2 can be returned near the ground of the load to provide remote
ground sensing and improve load regulation.
8.2.1.2.3 Protection Diodes
When external capacitors are used with any IC regulator, it is sometimes necessary to add protection diodes to
prevent the capacitors from discharging through low current points into the regulator. Most 20-μF capacitors have
low enough internal series resistance to deliver 20-A spikes when shorted. Although the surge is short, there is
enough energy to damage parts of the IC.
14
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LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
When an output capacitor is connected to a regulator and the input is shorted, the output capacitor discharges
into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage
of the regulator, and the rate of decrease of VIN. In the LM138QML, this discharge path is through a large
junction that is able to sustain 25-A surge with no problem; this is not true of other types of positive regulators.
For output capacitors of 100 μF or less at an output of 15 V or less, there is no need to use diodes.
The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs
when either the input or output is shorted. Internal to the LM138QML is a 50-Ω resistor which limits the peak
discharge current. No protection is needed for output voltages of 25-V or less and 10-μF capacitance. 图 17
shows an LM138QML with protection diodes included for use with outputs greater than 25 V and high values of
output capacitance.
D1
1N4002
LM138QML
VIN
VIN
VOUT
VOUT
C1
ADJ
+
R1
120
D2
1N4002
+
C2
R2
10 µF
Copyright © 2017, Texas Instruments Incorporated
D1 protects against C1
D2 protects against C2
R2
R1
≈
’
VOUT = 1.25 V 1+
+ IADJ R2
∆
÷
◊
«
图 17. Regulator With Protection Diodes
8.2.1.3 Application Curves
图 18. Regulator Start-Up
图 19. Regulator Shutdown
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ZHCSH04 –OCTOBER 2017
www.ti.com.cn
图 20. Regulator Response to Load Stop
16
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LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
8.3 System Examples
LM138QML
VOUT
VIN
VIN
VOUT = 15 V
ADJ
R1
120
R2
1.4 k
VREF = 6.95 V
D1
LM329
Copyright © 2017, Texas Instruments Incorporated
图 21. Regulator and Voltage Reference
LM138QML
VIN > 28 V
VOUT ††
VOUT
VIN
ADJ
R1**
240
+
C1*
0.1 µF
C2†
1 µF
R2**
5 k
Copyright © 2017, Texas Instruments Incorporated
Full output current not available at high input-output voltages
† Optional—improves transient response. Output capacitors in the range of 1 μF to 1000 μF of aluminum or tantalum
electrolytic are commonly used to provide improved output impedance and rejection of transients.
* Needed if device is more than 6 inches from filter capacitors.
R2
≈
’
†† VOUT = 1.25 V 1+
+ IADJ (R 2 )
∆
÷
R1
«
◊
** R1, R2 as an assembly can be ordered from Bourns:
MIL part no. 7105A-AT2-502
COMM part no. 7105A-AT7-502
图 22. 1.2-V to 25-V Adjustable Regulator
版权 © 2017, Texas Instruments Incorporated
17
LM138QML
ZHCSH04 –OCTOBER 2017
www.ti.com.cn
System Examples (接下页)
LM138QML
OUT
VOUT
VIN
IN
ADJ
R1
1.2 k
HEATER
LM334
100 k
GAIN
R2
80
Copyright © 2017, Texas Instruments Incorporated
图 23. Temperature Controller
LM138QML
OUT
IN
> 4 V
VIN
VOUT
ADJ
1.2 k
R1
375
IN457
10 k*
LM336
IN457
R2
2 k
OUTPUT
ADJUST
Copyright © 2017, Texas Instruments Incorporated
* Adjust for 3.75 V across R1
图 24. Precision Power Regulator With Low Temperature Coefficient
18
版权 © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
System Examples (接下页)
LM138QML
VOUT
VOUT
15 V
VIN
VIN
ADJ
R1
C2
120
0.1 µF
1N4002
R3
50 k
R2
1.37 k
2N2905
+
C1
100 µF
Copyright © 2017, Texas Instruments Incorporated
图 25. Slow Turnon 15-V Regulator
LM138QML
VIN
VIN
VOUT
ADJ
D1*
1N4002
R1
240
C2
0.1 µF
+
C3
1 µF†
+
C1
10 µF
R2
5 k
Copyright © 2017, Texas Instruments Incorporated
† Solid tantalum
* Discharges C1 if output is shorted to ground
图 26. Adjustable Regulator With Improved Ripple Rejection
LM138QML
VOUT
10 V
VIN
15 V
VOUT
VIN
ADJ
R1
2 K
5%
C1
0.1 µF
R2
1.5 K
5%
R3
267
1%
Copyright © 2017, Texas Instruments Incorporated
图 27. High Stability 10-V Regulator
版权 © 2017, Texas Instruments Incorporated
19
LM138QML
ZHCSH04 –OCTOBER 2017
www.ti.com.cn
System Examples (接下页)
LM138QML
VOUT
VIN
VOUT
VIN
ADJ
R1
240
R2*
Inputs
Copyright © 2017, Texas Instruments Incorporated
* Sets maximum VOUT
图 28. Digitally Selected Outputs
R5
0.1
LM138QML
VIN
VOUT
ADJ
R4
2 k
LM138QML
R1
0.05
R6
0.1
VIN
VIN
VOUT
ADJ
R3
2 k
3
2
7
+
6
LM307
4
-
R2
0.1
LM138QML
VIN
VOUT
VOUT
*
ADJ
R7*
120
+
+
C1
C2
22 µF
10 µF
R8
2 k
Copyright © 2017, Texas Instruments Incorporated
* Minimum load—100 mA
图 29. 15-A Regulator
20
版权 © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
System Examples (接下页)
LM138QML
VIN VOUT
VIN
7 V œ 35 V
VOUT
5 V
ADJ
R1
120
C1
C2
0.1 µF
0.1 µF
R2
360
2N2219
TTL
1 k
Copyright © 2017, Texas Instruments Incorporated
** Minimum output ≈ 1.2 V
图 30. 5-V Logic Regulator With Electronic Shutdown**
LM138QML
VIN
OUT
IN
ADJ
2 k
Copyright © 2017, Texas Instruments Incorporated
图 31. Light Controller
版权 © 2017, Texas Instruments Incorporated
21
LM138QML
ZHCSH04 –OCTOBER 2017
www.ti.com.cn
System Examples (接下页)
LM138QML
VIN VOUT
VIN
25 V
VOUT
ADJ
R1
240
C1
0.1 µF
R2
5 k
LM113
1.2 V
R3
680
œ10 V
Copyright © 2017, Texas Instruments Incorporated
Full output current not available at high input-output voltages
图 32. 0-V to 22-V Regulator
500
R6
0.2
LM138QML
VIN > 18 V
+
R2
15
LED
R5
1 k
R3
230
R4
15 k
+
7
TO 12 V
BATTERY
Q1
2N2905
LM301A
1
2
1N457
-
8
R1
3 k
4
+
0.1 µF
1 µF
1000 pF
START
-
Copyright © 2017, Texas Instruments Incorporated
图 33. 12-V Battery Charger
22
版权 © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
System Examples (接下页)
LM138QML
R1
0.24
IOUT
VIN
VIN
VOUT
0 A œ 5 A
ADJ
R2
150
VIN
VOUT
ADJ
LM117
R3
120
Vœ
œ5 V TO œ10 V
Copyright © 2017, Texas Instruments Incorporated
图 34. Adjustable Current Regulator
LM138QML
VOUT
VREF
VIN
IOUT =
VIN
R1
ADJ
R1
Copyright © 2017, Texas Instruments Incorporated
图 35. Precision Current Limiter
LM138QML
VIN
VOUT
VIN
ADJ
R1
0.24 Ω
2 W
C1
0.1 µF
LOAD
Copyright © 2017, Texas Instruments Incorporated
图 36. 5-A Current Regulator
版权 © 2017, Texas Instruments Incorporated
23
LM138QML
ZHCSH04 –OCTOBER 2017
www.ti.com.cn
System Examples (接下页)
R2
720
R1
240
LM138QML
ADJ
VIN
VOUT
VIN
VOUT
VOUT
VIN
ADJ
LM138QML
R3
120
+
C2
0.1 µF
C2
1 µF
R4
1 k
OUTPUT
ADJUST
Copyright © 2017, Texas Instruments Incorporated
图 37. Tracking Preregulator
LM138QML
VOUT
VIN
VOUT
VOUT
VOUT
VIN
VIN
VIN
VIN
VOUT
†
VIN
VOUT †
ADJ
ADJ
ADJ
R1
120
1N4002
1N4002
1N4002
R2
1 k
Copyright © 2017, Texas Instruments Incorporated
† Minimum load—10 mA
* All outputs within ±100 mV
图 38. Adjusting Multiple On-Card Regulators With Single Control*
24
版权 © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
System Examples (接下页)
35 V
22
100 k
MJ4502
RF
CF
6
10 k
75 pF
5 k
2
3
-
+
IN
7
LF351
+
1000 µF
RL > 4
20 pF
4
LM395
+
1 µF
100 k
INPUT
ADJ
OUT
LM138QML
0.1 µF
0.4
Copyright © 2017, Texas Instruments Incorporated
AV = 1, RF = 10k, CF = 100 pF
AV = 10, RF = 100k, CF = 10 pF
Bandwidth ≥ 100 kHz
Distortion ≤ 0.1%
图 39. Power Amplifier
LM138QML
VOUT
RS*
0.1
VIN
VIN
ADJ
R1
240
12 V
+
1000 µF**
R2
2.4 k
Copyright © 2017, Texas Instruments Incorporated
R2
R1
≈
’
Z OUT = R S ∆1+
÷
«
◊
* RS sets output impedance of charger
Use of RS allows low charging rates with fully charged battery.
** The 1000 μF is recommended to filter out input transients
图 40. Simple 12-V Battery Charger
版权 © 2017, Texas Instruments Incorporated
25
LM138QML
ZHCSH04 –OCTOBER 2017
www.ti.com.cn
System Examples (接下页)
0.1
VIN
LM138QML
0.1
0.1
LM138QML
LM138QML
VIN
VOUT
4.5 V to 25 V
ADJ
100
5 k
2N2905
7
-
2
3
6
LM308
150
1.5 k
5 k
+
8
200 pF
4
Copyright © 2017, Texas Instruments Incorporated
图 41. Adjustable 15-A Regulator
26
版权 © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
System Examples (接下页)
LM138QML
VIN
9 V to 30 V
VOUT
VIN
ADJ
240
+
+
1000 µF**
1.1 k
100
2N2222
0.2*
Copyright © 2017, Texas Instruments Incorporated
* Set max charge current to 3 A
** The 1000 μF is recommended to filter out input transients.
图 42. Current Limited 6-V Charger
版权 © 2017, Texas Instruments Incorporated
27
LM138QML
ZHCSH04 –OCTOBER 2017
www.ti.com.cn
System Examples (接下页)
R
0.1
LM138QML
VIN VOUT
ADJ
R3
2 k
3
2
7
+
6
LM107
-
4
LM138QML
R
0.1
OUTPUT*
1.2 V to 20 V
VIN
VIN
VOUT
ADJ
R1
120
+
C1
1 µF
R2
2 k
Copyright © 2017, Texas Instruments Incorporated
* Minimum load—100 mA
图 43. 10-A Regulator
28
版权 © 2017, Texas Instruments Incorporated
LM138QML
www.ti.com.cn
ZHCSH04 –OCTOBER 2017
9 Power Supply Recommendations
The input supply to LM138QML must be kept at a voltage level such that its maximum input to output differential
voltage rating is not exceeded. The minimum dropout voltage must also be met with extra headroom when
possible to keep the LM138QML in regulation. TI recommends a capacitor be placed at the input to bypass
noise.
10 Layout
10.1 Layout Guidelines
Some layout guidelines must be followed to ensure proper regulation of the output voltage with minimum noise.
Traces carrying the load current must be wide to reduce the amount of parasitic trace inductance and the
feedback loop from VOUT to ADJ must be kept as short as possible. To improve PSRR, a bypass capacitor can
be placed at the ADJ pin and must be placed as close as possible to the device. In cases when VIN shorts to
ground, an external diode must be placed from VOUT to VIN to divert the surge current from the output capacitor
and protect the deice. Similarly, in cases when a large bypass capacitor is placed at the ADJ pin and VOUT shorts
to ground, an external diode must be placed from ADJ to VOUT to provide a path for the bypass capacitor to
discharge. These diodes must be placed close to the corresponding device pins to increase their effectiveness.
10.2 Layout Example
图 44. LM138QML Layout
版权 © 2017, Texas Instruments Incorporated
29
LM138QML
ZHCSH04 –OCTOBER 2017
www.ti.com.cn
11 器件和文档支持
11.1 接收文档更新通知
要接收文档更新通知,请转至 TI.com 上的器件产品文件夹。单击右上角的通知我 进行注册,即可每周接收产品信
息更改摘要。有关更改的详细信息,请查看任何已修订文档中包含的修订历史记录。
11.2 社区资源
下列链接提供到 TI 社区资源的连接。链接的内容由各个分销商“按照原样”提供。这些内容并不构成 TI 技术规范,
并且不一定反映 TI 的观点;请参阅 TI 的 《使用条款》。
TI E2E™ 在线社区 TI 的工程师对工程师 (E2E) 社区。此社区的创建目的在于促进工程师之间的协作。在
e2e.ti.com 中,您可以咨询问题、分享知识、拓展思路并与同行工程师一道帮助解决问题。
设计支持
TI 参考设计支持 可帮助您快速查找有帮助的 E2E 论坛、设计支持工具以及技术支持的联系信息。
11.3 商标
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.4 静电放电警告
这些装置包含有限的内置 ESD 保护。 存储或装卸时,应将导线一起截短或将装置放置于导电泡棉中,以防止 MOS 门极遭受静电损
伤。
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 机械、封装和可订购信息
以下页面包含机械、封装和可订购信息。这些信息是指定器件的最新可用数据。这些数据如有变更,恕不另行通知
和修订此文档。如欲获取此数据表的浏览器版本,请参阅左侧的导航。
30
版权 © 2017, Texas Instruments Incorporated
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
LM138K-MIL
ACTIVE
TO
K
2
0
50
Non-RoHS &
Non-Green
Call TI
Call TI
LM138K-MIL
ACO
>T
LM138KG-MD8
ACTIVE
DIESALE
Y
100
RoHS & Green
Call TI
Level-1-NA-UNLIM
-55 to 125
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
5-Jan-2022
TRAY
Chamfer on Tray corner indicates Pin 1 orientation of packed units.
*All dimensions are nominal
Device
Package Package Pins SPQ Unit array
Max
matrix temperature
(°C)
L (mm)
W
K0
P1
CL
CW
Name
Type
(mm) (µm) (mm) (mm) (mm)
LM138K-MIL
K
TO-CAN
2
50
9 X 6
NA
292.1 215.9 25654 3.87
22.3
25.4
Pack Materials-Page 1
MECHANICAL DATA
K0002C
K02C (Rev E)
4214774/A 03/2013
NOTES:
1. All linear dimensions are in millimeters. Dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Leads not to be bent greater than 15º
www.ti.com
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