TL431A
Adjustable Precision Shunt Regulator
ABSOLUTE MAXIMUM RATINGS
(Operating temperature range applies unless otherwise specified)
Characteristic
Symbol
Value
Unit
Cathode Voltage
VKA
IK
37
V
Cathode Current Range (Continuous)
Reference Input Current Range
Operating Temperature Range
Storage Temperature Range
-100 ~ +150
0.05 ~ +10
0 ~ +70
mA
mA
oC
IREF
TA
Tstg
-65 ~ +150
oC
RECOMMENDED OPERATING CONDITIONS
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
Cathode Voltage
Cathode Current
VKA
IK
VREF
1.0
36
V
100
mA
ELECTRICAL CHARACTERISTICS
(TA = 25oC, unless otherwise specified)
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
Reference Input Voltage
VREF
VKA = VREF, IK = 10mA
VKA = VREF, IK = 10mA
Tmin ≤ TA ≤ Tmax
2.475
2.495
3
2.515
17
V
Deviation of Reference Input Voltage
Over-Temperature (Note 1)
VREF(dev)
mV
Ratio of Change in Reference Input
Voltage to the Change in
-1.4
-2.7
∆VKA = 10V-VREF
∆VREF
∆VKA
IK = 10mA
mV/V
Cathode Voltage
-1.0
1,8
0.4
-2.0
4
∆KKA = 36V- 10V
Reference Input Current
IREF
IK = 10mA, R1 = 10KΩ, R2 = ∞
IK = 10mA, R1 = 10KΩ, R2 = ∞
Ta = Full Range
µA
µA
Deviation of Reference Input Current
Over Full Temperature Range
IREF(dev)
1.2
Minimum Cathode Current for
Regulation
IK(min)
VKA = VREF
0.5
1.0
mA
Off-State Cathode Current
IK(off)
ZKA
VKA = 36V, VREF = 0
0.26
0.22
1.0
0.4
µA
Dynamic Impedance
(Note2)
VKA = VREF, IK = 10mA to 100mA
Ω
f ≤ 1.0KHz
Note: 1. The deviation parameters VREF(dev) and IREF(dev) are defined as the differences between the maximum and minimum values obtained over the rated
temperature range.
VREF(dev) = VREF(max) - VREF(min)
The equivalent full-range temperature coefficient of the reference
input voltage, αVREF is defined as:
VREF(dev)
× 106
(
)
ppm
VREF@ ° C
αVREF
=
(
)
° C
∆ Ta
A
Where ∆TA is the rated operating free-air temperature range of
AA
the device.
αVREF can be positive or negative depending on whether minimum VREF or
maximum VREF respectively, occurs at the
lower temperature.
2.
The dynamic impedance is defined as:
∆ VKA
ZKA
=
∆ IK
Wing Shing Computer Components Co., (H.K.)Ltd.
Homepage: http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153
E-mail: wsccltd@hkstar.com
2
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