LM431K-XX-AR [TAITRON]
Shunt Regulator; 并联稳压器
| 型号： | LM431K-XX-AR |
| 厂家： | 
TAITRON COMPONENTS INCORPORATED |
| 描述： | Shunt Regulator |
| 文件： | 总14页 (文件大小：769K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Shunt Regulator
LM431 LM431A LM431B
Shunt Regulator
General Description
• The LM431 Series ICs are three-terminal programmable
shunt regulators with guaranteed thermal stability over a
full operation range. These monolithic ICs voltage reference
operate as a low temperature coefficient Zener which is
programmable from Vref to 36V with two external resistors.
These devices exhibit a wide operating current range of 1.0 to
100mA with a typical dynamic impedance of 0.15 to 0.22Ω. The
characteristics of these references make them excellent
replacements for Zener diodes in many applications such as
digital voltmeters, power supplies and op amp circuitry
The 2.5V reference makes it convenient to obtain a stable
reference from 5.0V logic supplies, and since the LM431 series
operates as a shunt regulator, it can be used as either a positive or
negative voltage reference.
TO-92
SOT-23
SOP-8
SOT-23-5
SOT-89
• The output voltage of both types can be set to any value between VREF (2.5V) and the corresponding
maximum cathode voltage.
.
Features
Applications
• Charger
• Programmable Precise Output Voltage from
2.5V to 36V
• Voltage Adapter
• Switching Power Supply
• Graphic Card
• High Stability under Capacitive Load
• Low Temperature Deviation
• Precision Voltage Reference
• Can be used in either positive or negative
Voltage reference
• Low Dynamic Output Impedance: 0.15 to 0.22Ω Typical
• Operating Current from 1.0mA to 100mA
• Low Output Noise Voltage
• RoHS Compliance
Rev. A/DX 2007-06-04
Page 1 of 14
TAITRON COMPONENTS INCORPORATED www.taitroncomponents.com
Tel:
(800)-TAITRON (800)-824-8766 (661)-257-6060
(800)-TAITFAX (800)-824-8329 (661)-257-6415
Fax:
Shunt Regulator
LM431
Ordering Information
Pin Configuration
Outline: Z
TO-92
Outline: N
SOT-23
Outline: N5
SOT-23-5
Outline: S8
SOP-8
Outline: K
SOT-89
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431
Block Diagram
Symbols
Absolute Maximum Ratings (Ta=25° C)
(Full operating ambient temperature range applies unless otherwise noted.)
Symbol
Description
LM431
LM431A
LM431B
Unit
VKA
IKA
Cathode Voltage
36
V
Cathode Current Range (Continuous)
Reference Input Current Range
(Continuous)
-100 ~ 150
mA
IREF
-0.05 ~ 10
mA
TJ
Operating Junction Temperature
Operating Temperature Range
Storage Temperature Range
150
° C
° C
° C
TOPR
TSTG
-40 ~ 85
-40 ~ 125
-65 ~ 150
770
Z:TO-92
700
N:SOT-23
-
370
370
770
770
150
330
250
50
PD
Power Dissipation
mW
N5:SOT-23-5
K: SOT-89
S8: SOP-8
Z:TO-92
-
800
-
180
N:SOT-23
N5:SOT-23-5
K: SOT-89
S8: SOP-8
-
Package Thermal
Impedance
RthJA
° C/W
-
160
-
150
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431
Electrical Characteristics (TA=25ºC, unless otherwise specified)
LM431
Typ.
LM431A
LM431B
Test
Circuit
Symbol
Description
Unit
Conditions
Min.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max.
Reference Input
Voltage
2.440 2.495 2.550 2.480 2.500 2.520 2.490 2.500 2.510
V
Fig.1
VKA=VREF,IKA=10mA
VREF
0-70° C
-
-
-
-
-
-
4.8
4.5
8
-
-
4.5
4.5
8
Reference
Input
Voltage
Deviation
Fig.1
(Note1)
mV
VKA=VREF,IKA=10mA
∆VREF
-40-85
°C
7.0
30
10
10
∆VKA=10V~
VREF
IKA=
Ratio of Change in
Reference Input
Voltage to Change in
Cathode to Anode
Voltage
-
-
-1.4
-1.0
-2.7
-2.0
-
-
-1.0
-0.5
-2.7
-2.0
-
-
-1.0
-0.5
-2.7
-2.0
mV/V
Fig.2
∆VREF/∆VKA
10mA
∆VKA=36V~
10V
Ta=25°
C
-
-
1.8
-
4.0
6.5
-
-
0.7
-
4.0
-
-
-
0.7
-
4.0
-
Referenc
e Input
Current
IKA=10mA, R1=10KΩ,
R2=∞
µA
Fig.2
Fig.2
IREF
Ta=Topr
IKA=10mA, R1=10KΩ,
R2=∞,
Reference Input
Current Deviation
-
-
0.8
0.5
2.5
1.0
-
-
0.4
0.4
1.2
1.0
-
-
0.4
0.4
1.2
1.0
µA
∆IREF
-40 ~ 85° C
Min. Cathode Current
For Regulation
mA
Fig.1
Fig.3
VKA=VREF
IMIN
Off-State Cathode
Current
-
-
2.6
1000
-
-
-
50
1000
0.5
-
-
50
1000
0.5
nA
VKA=36V, VREF=0V
IOFF
ZKA
VKA=VREF,
IKA=1.0~100mA,
f≤1.0KHz
Fig.1
(Note2)
Dynamic Impedance
0.22
0.15
0.15
Ω
Fig.1- Test Circuit for VKA=VREF
Fig.2- Test Circuit for VKA>VREF
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431
Fig.3- Test Circuit for IOFF
Note1:
Note2:
Rev. A/DX 2007-06-04
Page 5 of 14
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Shunt Regulator
LM431
Typical Characteristics Curves
Fig.4- IK - VKA
Fig.5- IK - VKA
Cathode Voltage VKA (V)
Cathode Voltage VKA (V)
Fig.6- ∆VREF - VKA
Fig.7- │ZKA│ - f
Cathode Voltage VKA (V)
Frequency f (Hz)
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431
Fig.8- GVO - f
Fig.9- Pulse Response
Time t (µs)
Frequency f (Hz)
Fig.10- Dynamic Impedance vs. Frequency
Frequency f (Hz)
Rev. A/DX 2007-06-04
Page 7 of 14
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Shunt Regulator
LM431
Typical Application
Fig.11-Shunt Regulator
Fig.12- High Current Shunt Regulator
Fig.13- Current Source of Current Limit
Rev. A/DX 2007-06-04
Page 8 of 14
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Shunt Regulator
LM431
Typical Application (Continued)
Fig.14- Precision 5V 1.5A Regulator
Fig.15- PWM Converter with Reference
Rev. A/DX 2007-06-04
Page 9 of 14
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Shunt Regulator
LM431
Device Marking Code
Circuit
LM431
Tolerance
SOT-23 (N)
SOT-23-5 (N5)
SOT-89 (K)
Blank
2.20%
0.80%
0.40%
3A
3A
3A
A
B
EA2
EA1
E3B
E3A
E43B
E43A
Dimensions in inches (mm)
SOP-8
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431
TO-92
Rev. A/DX 2007-06-04
Page 11 of 14
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Shunt Regulator
LM431
SOT-23
SOT-23-5
Rev. A/DX 2007-06-04
Page 12 of 14
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Shunt Regulator
LM431
SOT-89
Rev. A/DX 2007-06-04
Page 13 of 14
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Shunt Regulator
LM431
How to contact us:
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Email: taitron@taitroncomponents.com
Http://www.taitroncomponents.com
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Rev. A/DX 2007-06-04
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