V
TL431A
Characteristic
Cathode Voltage
Cathode Current
Symbol
V
KA
I
K
Adjustable Precision Shunt Regulator
Test Condition
Min
REF
RECOMMENDED OPERATING CONDITIONS
Typ
Max
40
100
Unit
V
mA
0.5
ELECTRICAL CHARACTERISTICS
(T
a
= 25
o
C, V
KA
= V
REF
, I
K
= 10mA unless otherwise specified)
Characteristic
Reference Input Voltage
Deviation of Reference Input
Voltage Over Full Temperature
Range
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
Symbol
V
REF
V
REF(dev)
Test Condition
Vka=Vref, Ik=10mA
Min
2.445
Typ
2.495
3
Max
2.545
17
Unit
V
mV
T
min
≤
Ta
≤
T
max
∆
V
R EF
∆
V
K A
I
REF
I
REF(dev)
∆V
KA
= 10V-V
REF
∆V
KA
= 36V- 10V
R
1
= 10KΩ, R
2
=
∞
R
1
= 10KΩ, R
2
=
∞
-1.4
-1.0
1.8
0.4
-2.7
-2.0
4
1.2
mV/V
µA
µA
I
K(min)
I
K(off)
Z
KA
V
KA
= 40V, V
REF
= 0
I
K
= 10mA to 100 mA , f
≤
1.0KHz
0.25
0.26
0.22
0.5
0.9
0.5
mA
µA
Ω
TEST CIRCUITS
Fig.1. Test Circuit for V
KA
= V
REF
Fig.2. Test Circuit for V
KA
≥
V
REF
Fig.3. Test Circuit for I
off
IN P U T
V
KA
IN P U T
V
KA
IN P U T
V
KA
I
K
I
K
R1
I
R E F
B T 432
10n F
R2
V
R EF
I
K (O F F )
B T 432
V
R EF
B T 432
10n F
V
K A
= V
R E F
(1+ R 1/R 2)+ I
R E F
R 1
2
WINGS [ WING SHING COMPUTER COMPONENTS ]
