TL431
Adjustable Accurate Reference Source
Features
The output voltage can be adjusted to 36V
Low dynamic output impedance, its typical value is 0.2
Trapping current capability is 1 to 100mA
0.1
2.9
0.4
0.1
0.1
3
SOT-23
Unit: mm
2.4
whole temperature scope is 50 ppm/
The effective temperature compensation in the working
range of full temperature
Low output noise voltage
Fast on-state response
1.3
0.1
The typical value of the equivalent temperature factor in the
1
0.95
0.1
0.1
2
0.55
0.4
0.1
+0.05
-0.01
1.9
0.1
0.97
0.1
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified)
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
Operating Temperature
Storage Temperature Range
Symbol
V
KA
I
KA
I
REF
P
D
T
OPR
T
STG
0
-65
-100
0.05
350
70
+150
Rating
37
+150
+10
Unit
V
mA
mA
mW
Electrical Characteristics (Ta = 25
Parameter
Reference Input Voltage
Deviation of Reference Input Voltage
Over Temperature
(*)
unless otherwise specified)
Symbol
V
REF
V
REF
/
T
Testconditons
V
KA
= V
REF
, I
KA
= 10mA
V
KA
= V
REF
, I
KA
= 10mA
T
min
V
REF
/
I
REF
I
REF
/
I
KA(min)
I
KA(OFF)
Z
KA
T
V
KA
T
a
T
max
V
KA
= 10V
V
KA
= 36V
V
REF
10V
-1.0
-0.5
1.5
0.4
0.45
0.05
0.15
-2.7
-2.0
4
1.2
1.0
1.0
0.5
mV/V
mV/V
A
A
mA
A
Min
2.45
Typ
2.5
4.5
Max
2.55
17
Unit
V
mV
Ratio of Change in Reference Input Voltage
to the Change in Cathode Voltage
Reference Input Current
Deviation of Reference Input Current
Over Full Temperature Range
Minimum Cathode Current for Regulation
Off-state Cathode Current
Dynamic Impedance
* T
MIN
= 0
, T
MAX
= +70
I
KA
= 10mA ,
I
KA
= 10mA ,
I
KA
= 10mA , R
1
= 10K
I
KA
= 10mA , R
1
= 10K
T
A
= Full Temperature
V
KA
= V
REF
V
KA
= 36V, V
REF
= 0
, R
2
=
, R
2
=
V
KA
= V
REF
, I
KA
= 1 to 100mA,
f
1.0KHz
Classification Of V
REF
Rank
Range
0.5%
2.487
2.512
2.475
1%
2.525
2.450
2%
2.550
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1
0.38
1.Reference
2.Cathode
3.Anode
0
0.1
TL431
Typical Characteristics
800
125
V
KA
= V
REF
T
A
= 25
V
KA
= V
REF
T
A
= 25
Cathode Current (mA)
75
50
25
0
-25
-50
-75
-100
-2
-1
0
1
2
3
Cathode Current ( A)
100
600
400
I
KA
(MIN)
200
0
-200
-1
0
1
2
3
Cathode Voltage (V)
Cathode Voltage (V)
Cathode Current vs. Cathode Voltage
Change in Reference Input voltage (mV)
0
-5
-10
-15
-20
-25
-30
-35
-40
0
5
10
15
20
25
30
35
40
I
KA
= 10mA
T
A
= 25
100
70
40
20
Cathode Current vs. Cathode Voltage
T
A
= 25
I
KA
= 1mA to 100mA
Impedance ( )
10
7
4
2
1
0.7
0.4
0.2
0.1
1K
10K
100K
1M
10M
Cathode Voltage (V)
Frequency (Hz)
Change in Reference Input Voltage vs.
Cathode Voltage
70
6
I
KA
= 10mA
T
A
= 25
Dynamic Impedance Frequency
T
A
= 25
Input and Output Voltage (V)
Voltage Amplification (dB)
60
50
40
30
20
10
0
-10
1K
10K
100K
INPUT
8
4
3
OUTPUT
2
1
0
1M
10M
0
1
2
3
4
5
6
7
Frequency (Hz)
Time (
s)
Small Signal Voltage Amplification
vs. Frequency
Pulse Response
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