TAITRON LM431B Shunt regulator Datasheet

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
• Programmable Precise Output Voltage from
2.5V to 36V
• High Stability under Capacitive Load
• Low Temperature Deviation
• 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
TAITRON COMPONENTS INCORPORATED www.taitroncomponents.com
Tel:
Fax:
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
(800)-TAITRON (800)-824-8766
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(661)-257-6060
(661)-257-6415
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431
Ordering Information
Pin Configuration
Outline: Z
TO-92
Outline: S8
SOP-8
Outline: N
SOT-23
Outline: N5
SOT-23-5
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
VKA
IKA
TJ
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
(Continuous)
Operating Junction Temperature
TOPR
TSTG
Operating Temperature Range
Storage Temperature Range
IREF
PD
RthJA
Power Dissipation
Package Thermal
Impedance
LM431
-40 ~ 85
LM431A
LM431B
Unit
36
-100 ~ 150
V
mA
-0.05 ~ 10
mA
150
°C
-40 ~ 125
-65 ~ 150
Z:TO-92
700
770
N:SOT-23
-
370
N5:SOT-23-5
-
370
K: SOT-89
800
770
S8: SOP-8
-
770
Z:TO-92
180
150
N:SOT-23
-
330
N5:SOT-23-5
-
250
K: SOT-89
160
50
S8: SOP-8
-
150
°C
°C
mW
° C/W
Rev. A/DX 2007-06-04
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Page 3 of 14
Shunt Regulator
LM431
Electrical Characteristics (TA=25ºC, unless otherwise specified)
Symbol
VREF
∆VREF
∆VREF/∆VKA
Description
Reference Input
Voltage
Reference
Input
Voltage
Deviation
0-70° C
-40-85
°C
Ratio of Change in
Reference Input
Voltage to Change in
Cathode to Anode
Voltage
LM431
LM431A
LM431B
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max.
2.440
2.495
2.550
2.480
2.500
2.520
2.490
2.500
2.510
-
-
-
-
4.8
8
-
4.5
8
-
7.0
30
-
4.5
10
-
4.5
10
-
-1.4
-2.7
-
-1.0
-2.7
-
-1.0
-2.7
-1.0
-2.0
-
-0.5
-2.0
-
-0.5
-2.0
Ta=25°
C
-
1.8
4.0
-
0.7
4.0
-
0.7
4.0
Ta=Topr
-
-
6.5
-
-
-
-
-
-
Reference Input
Current Deviation
-
0.8
2.5
-
0.4
1.2
-
0.4
IMIN
Min. Cathode Current
For Regulation
-
0.5
1.0
-
0.4
1.0
-
IOFF
Off-State Cathode
Current
-
2.6
1000
-
50
1000
ZKA
Dynamic Impedance
-
0.22
-
-
0.15
0.5
IREF
∆IREF
Test
Circuit
Conditions
V
Fig.1
VKA=VREF,IKA=10mA
mV
Fig.1
(Note1)
VKA=VREF,IKA=10mA
mV/V
-
Referenc
e Input
Current
Unit
Fig.1- Test Circuit for VKA=VREF
Fig.2
IKA=
10mA
∆VKA=10V~
VREF
∆VKA=36V~
10V
IKA=10mA, R1=10KΩ,
R2=∞
µA
Fig.2
1.2
µA
Fig.2
IKA=10mA, R1=10KΩ,
R2=∞,
0.4
1.0
mA
Fig.1
VKA=VREF
-
50
1000
nA
Fig.3
VKA=36V, VREF=0V
-
0.15
0.5
Ω
Fig.1
(Note2)
VKA=VREF,
IKA=1.0~100mA,
f≤1.0KHz
-40 ~ 85° C
Fig.2- Test Circuit for VKA>VREF
Rev. A/DX 2007-06-04
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Page 4 of 14
Shunt Regulator
LM431
Fig.3- Test Circuit for IOFF
Note1:
Note2:
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431
Typical Characteristics Curves
Fig.5- IK - VKA
Cathode Current IK (µA)
Cathode Current IK (mA)
Fig.4- IK - VKA
Cathode Voltage VKA (V)
Cathode Voltage VKA (V)
Cathode Voltage VKA (V)
Fig.7- │ZKA│ - f
Dynamic Impedance │ZKA│ (Ω)
Change In Reference Input
Voltage ∆VREF (nV)
Fig.6- ∆VREF - VKA
Frequency f (Hz)
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431
Fig.9- Pulse Response
Voltage Swing (V)
Open Loop Voltage Gain GVO (dB)
Fig.8- GVO - f
Time t (µs)
Frequency f (Hz)
Reference Impedance (Ω)
Fig.10- Dynamic Impedance vs. Frequency
Frequency f (Hz)
Rev. A/DX 2007-06-04
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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
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Page 8 of 14
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
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Page 9 of 14
Shunt Regulator
LM431
Device Marking Code
Circuit
LM431
Tolerance
SOT-23 (N)
SOT-23-5 (N5)
SOT-89 (K)
Blank
2.20%
3A
3A
3A
A
0.80%
EA2
E3B
E43B
B
0.40%
EA1
E3A
E43A
Dimensions in inches (mm)
SOP-8
Rev. A/DX 2007-06-04
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Page 10 of 14
Shunt Regulator
LM431
TO-92
Rev. A/DX 2007-06-04
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Page 11 of 14
Shunt Regulator
LM431
SOT-23
SOT-23-5
Rev. A/DX 2007-06-04
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Page 12 of 14
Shunt Regulator
LM431
SOT-89
Rev. A/DX 2007-06-04
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Page 13 of 14
Shunt Regulator
LM431
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