TL431
ELECTRICAL CHARACTERISTICS
T
amb
= 25°C (unless otherwise specified)
TL431I
Symbol
Parameter
Min.
V
ref
Reference Input Voltage
V
KA
= V
ref
, I
k
= 10 mA T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Reference Input Voltage Deviation Over-
Temperature Range - note 1
V
KA
= V
ref
, I
k
=10 mA,T
min
≤
T
amb
≤
T
max
Ratio of Change in Reference Input
Voltage to Change in Cathode to Anode
Voltage
Ik = 10mA
∆V
KA
= 10V to V
ref
∆V
KA
= 36V to 10V
Reference Input Current
Ik = 10mA, R1 = 10kΩ, R2 =
∞
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Reference Input Current Deviation
Over Temperature Range
Ik = 10mA, R1 = 10kΩ, R2 =∞
T
min
≤
T
amb
≤
T
max
Minimum Cathode Current for Regulation
V
KA
= V
ref
Off-State Cathode Current
Dynamic Impedance note 2
V
KA
= V
ref
,∆ I
k
= 1 to100mA, f
≤
1kHZ
2.44
2.41
Typ.
2.495
Max.
2.55
2.58
Min.
2.47
2.44
Typ.
2.495
Max.
2.52
2.55
V
TL431AI
Unit
∆V
ref
7
30
7
30
mV
∆Vref
------------
∆V
ka
-1.4
-1
-2.7
-2
-1.4
-1
-2.7
-2
mV/V
I
ref
1.8
4
6.5
1.8
4
6.5
µA
∆I
ref
0.8
0.5
2.6
0.22
2.5
1
1000
0.5
0.8
0.5
2.6
0.22
1.2
0.7
1000
0.5
µA
mA
nA
Ω
I
min
I
off
Z
KA
1) ∆V
ref
is defined as the difference between the maximum and minimum values obtained over the full temperature range.
∆V
ref
= V
ref max.
- V
ref min.
V
ref max.
V
ref min.
T1
T2
Temperature
∆V
KA
-
2) The dynamic Impedance is definied as
ZKA =
----------------
∆I
K
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STMICROELECTRONICS [ STMICROELECTRONICS ]
