TL431A Datasheet, PDF (2/7 Pages) Unisonic Technologies – PROGRAMMABLE PRECISION REFERENCE

V
TL431A
Adjustable Precision Shunt Regulator
RECOMMENDED OPERATING CONDITIONS
Characteristic
Cathode Voltage
Cathode Current
Symbol
VKA
IK
Test Condition
Min
REF
0.5
Typ Max
40
100
Unit
V
mA
ELECTRICAL CHARACTERISTICS
(Ta = 25^oC, VKA = VREF, IK = 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
VREF
VREF(dev)
∆V R EF
∆V K A
IREF
IREF(dev)
IK(min)
IK(off)
ZKA
Test Condition
Vka=Vref, Ik=10mA
Tmin ≤ Ta ≤ Tmax
∆VKA = 10V-VREF
∆VKA = 36V- 10V
R1 = 10KΩ, R2 = ∞
R1 = 10KΩ, R2 = ∞
VKA = 40V, VREF = 0
IK = 10mA to 100 mA , f ≤ 1.0KHz
Min
Typ
Max
Unit
2.445 2.495 2.545
V
3
17
mV
-1.4
-2.7
mV/V
-1.0
-2.0
1.8
4
µA
0.4
1.2
µA
0.25 0.5
mA
0.26
0.9
µA
0.22
0.5
Ω
TEST CIRCUITS
Fig.1. Test Circuit for VKA = VREF
IN P U T
VKA
IK
V REF
B T 432
10n F
Fig.2. Test Circuit for VKA ≥ VREF
IN P U T
V KA
Fig.3. Test Circuit for Ioff
IN P U T
VKA
R1
IR E F
10n F
R 2 ^{V R EF}
IK
B T 432
IK (O F F )
B T 432
V K A = V R E F (1+ R 1/R 2)+ IR E F R 1
2