TL431I
Adjustable Precision Shunt Regulator (I Grade)
RECOMMENDED OPERATING CONDITIONS
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
Cathode Voltage
Cathode Current
VKA
IK
40
V
REF
0.5
100
mA
ELECTRICAL CHARACTERISTICS
(Ta = 25oC, VKA = VREF, IK = 10mA unless otherwise specified)
Characteristic
Symbol
Test Condition
Min
2.445
Typ
Max
Unit
Reference Input Voltage
VREF
2.495
3
2.545
V
Deviation of Reference Input
Voltage Over Full Temperature
Range
VREF(dev)
17
mV
T
min ≤ Ta ≤ Tmax
Vka=Vref, Ik=10mA
∆VKA = 10V-VREF
Ratio of Change in Reference Input
Voltage to the Change in Cathode
Voltage
∆VREF
∆VKA
-1.4
-2.7
mV/V
-1.0
-2.0
4
∆VKA = 36V- 10V
R1 = 10KΩ, R2 = ∞
Reference Input Current
IREF
1.5
µA
µA
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)
0.50
1
mA
Off-State Cathode Current
Dynamic Impedance
IK(off)
ZKA
VKA = 42V, VREF = 0
0.05
0.15
1.0
µA
0.5
IK = 10mA to 100 mA , f ≤ 1.0KHz
Ω
Ordering Information
Grade
AA
A
Accuracy
Marking
TL431AA
TL431A
TL431
Min.
2.488V
2.475V
2.445V
Typ.
Max.
2.495V
2.495V
2.495V
2.513V
2.525V
2.545V
0.5% of Typ.
1 % of Typ.
2 % of Typ.
B
Notice: Please don't confuse the version of product (-A,-I,-B Suffix) with Grade of product (AA,A,B).
TEST CIRCUITS
Fig.1. Test Circuit for VKA = VREF
Fig.2. Test Circuit for VKA ≥ VREF
Fig.3. Test Circuit for Ioff
IN PU T
IN P U T
IN PU T
V
K A
V
K A
V
K A
I
K
I
K
(O FF)
I
K
R1
I
R EF
BT432
BT432
BT432
V
R EF
R2
V
R EF
V
K A
= VR EF (1+ R 1/R 2)+ IR EF R1
2
Wing Shing [ WING SHING COMPUTER COMPONENTS ]
