TL431AD [IKSEMICON]
Programmable Precision Reference; 可编程精密基准
| 型号： | TL431AD |
| 厂家： | 
IK SEMICON CO., LTD |
| 描述： | Programmable Precision Reference |
| 文件： | 总12页 (文件大小：3529K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TECHNICAL DATA
TL431
Programmable Precision Reference
FEATURES
PIN CONNECTIONS
• Programmable Output Voltage to 40V
• Low Dynamic Output Impedance 0.2Ω
• Sink Current Capability of 0.1 mA to 100 mA
• Equivalent Full-Range Temperature
Coefficient of 50 ppm/oC
• Temperature Compensated for Operation over
Full Rated Operating Temperature Range
• Low Output Noise Voltage
ANODE
• Fast Turn on Response
• TO-92, SOP- 8, SOT-23, SOT-89 packages
REFERENCE
CATHODE
DESCRIPTION
The TL431 is a three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges.
The output voltage may be set to any value between Vref (approximately 2.5 volts) and 40 volts with two external resistors. These
devices have a typical dynamic output impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on characteristic,
making these devices excellent replacement for zener diodes in many applications.
The TL431 is characterized for operation from -25oC to +85oC.
SYMBOL
FUNCTIONAL BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
(Operating temperature range applies unless otherwise specified)
Characteristic Symbol
Cathode Voltage
Value
Unit
VKA
IK
40
V
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation at 25oC:
-100 ~ 150
0.05 ~ 10
mA
mA
IREF
PD
SOP, TO – 92 Package (R JA = 178oC/W)
0.7
0.2
W
W
oC
oC
oC
SOT Package (R JA = 625oC/W)
Junction Temperature Range
Operating Temperature Range
Storage Temperature Range
TJ
Tg
-40 ~ 150
-40 ~ +85
Tstg
-65 ~ +150
Rev. 00
TL431
RECOMMENDED OPERATING CONDITIONS
Characteristic
Cathode Voltage
Cathode Current
Symbol
Test Condition
Min
Typ
Max
Unit
VKA
IK
VREF
0.5
40
V
100
mA
ELECTRICAL CHARACTERISTICS
(Ta = 25oC, VKA = VREF, IK = 10mA unless otherwise specified)
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
Reference Input Voltage
VREF
VKA = VREF, IK = 10mA
2.440
2.470
2.482
2.495
2.495
2.495
2.550
2.520
2.508
TL431 (2%)
V
TL431-A (1%)
TL431-C (0.5%)
Deviation of Reference Input
Voltage Over Full Temperature
Range
VREF(dev)
Tmin ≤ Ta ≤ Tmax
3
17
MV
Ratio of Change in Reference Input
Voltage to the Change in Cathode
Voltage
ΔVREF
ΔVK A
-1.4
-2.7
ΔVKA = 10V-VREF
mV/V
-1.0
1.8
-2.0
4
ΔVKA = 36V- 10V
Reference Input Current
IREF
R1 = 10KΩ, R2 = ∞
㎂
㎂
Deviation of Reference Input
Current Over Full Temperature
Range
IREF(dev)
0.4
1.2
R1 = 10KΩ, R2 = ∞
Minimum Cathode Current for
Regulation
IK(min)
0.25
0.5
mA
Off-State Cathode Current
Dynamic Impedance
IK(off)
ZKA
VKA = 40 V, VREF = 0
0.26
0.22
0.9
0.5
㎂
IK = 10mA to 100 mA , f ≤ 1.0KHz
Ω
TEST CIRCUITS
Figure 1. Test Circuit for VKA = VREF
Figure 2. Test Circuit for VKA ≥ VREF
Figure 3. Test Circuit for I off
INPUT
V
KA
I
K(OFF)
TL431
TL431
TL431
Rev. 00
TL431
Electrical Characteristics (Continued)
∝
The average temperature coefficient of the reference input voltage,
V
, is defined as:
REF
Where:
− T = full temperature change (0-70˚C).
T
2
1
∝
V
can be positive or negative depending on whether the slope is positive or negative.
REF
Example: V
= 8.0 mV, V
= 2495 mV, T − T = 70˚C, slope is positive.
REF 2 1
DEV
Note 6: The dynamic output impedance, r , is defined as:
Z
When the device is programmed with two external resistors, R1 and R2, (see Figure 2 ), the dynamic output impedance of the overall circuit, r , is defined as:
Z
Rev. 00
TL431
Equivalent Circuit
Typical Performance Characteristics
Input Current vs VZ
Thermal Information
Input Current vs VZ
Dynamic Impedance vs Frequency
Rev. 00
TL431
Typical Performance Characteristics (Continued)
Stability Boundary Conditions
Note: The areas under the curves represent conditions that may cause the
+
device to oscillate. For curves B, C, and D, R2 and V were adjusted to
+
establish the initial V and I conditions with C = 0. V and C were then
Z
Z
L
L
adjusted to determine the ranges of stability.
Test Circuit for Curve A Above
Test Circuit for Curves B, C and D Above
Typical Applications
Single Supply Comparator with
Temperature Compensated Threshold
Shunt Regulator
Rev. 00
TL431
Typical Applications (Continued)
Higher Current Shunt Regulator
Series Regulator
Crow Bar
Output Control of a Three
Terminal Fixed Regulator
Rev. 00
TL431
Typical Applications (Continued)
Over Voltage/Under Voltage
Protection Circuit
Voltage Monitor
Rev. 00
TL431
Typical Applications (Continued)
Current Limiter or Current Source
Delay Timer
Constant Current Sink
Rev. 00
TL431
Ordering Information
Reference Input
Voltage
Product Number
Package
TL431CLF
TL431CLS
TL431CD
TL431CS
TL431CP
TL431ALF
TL431ALS
TL431AD
TL431AS
TL431AP
TL431LF
TL431LS
TL431D
TO-92
0.5%
1%
8-SOP
SOT-23
SOT-89
TO-92
8-SOP
SOT-23
SOT-89
TO-92
2%
8-SOP
SOT-23
SOT-89
TL431S
TL431P
Package Dimensions
D SUFFIX SOIC
(MS - 012AA)
Dimension, mm
A
8
5
Symbol
MIN
4.80
3.80
1.35
0.33
0.40
MAX
5.00
4.00
1.75
0.51
1.27
A
B
C
D
F
B
H
P
1
4
G
R x 45
C
-T-
SEATING
PLANE
1.27
5.72
G
H
J
K
M
D
J
F
M
0.25 (0.010) M T C
0°
8°
0.10
0.19
5.80
0.25
0.25
0.25
6.20
0.50
K
M
P
NOTES:
1. Dimensions A and B do not include mold flash or protrusion.
2. Maximum mold flash or protrusion 0.15 mm (0.006) per side
R
for A; for B 0.25 mm (0.010) per side.
‑
Rev. 00
TL431
TO-92
Rev. 00
TL431
Rev. 00
TL431
Rev. 00
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