Datasheet
TL431 Electrical Characteristics
5/13
Table 4. T
amb
= 25°C (unless otherwise specified)
Symbol Parameter
TL431I TL431AI
Unit
Min. Typ. Max. Min. Typ. Max.
V
ref
Reference Input Voltage
V
KA
= V
ref
, Ik = 10 mA, T
amb
= 25°C
T
min
≤T
amb
≤ T
max
2.44
2.41
2.49
5
2.55
2.58
2.47
2.44
2.49
5
2.52
2.55
V
∆V
ref
Reference Input Voltage Deviation Over Temperature
Range
(1)
V
KA
= V
ref
, Ik =10 mA, T
min
≤T
amb
≤ T
max
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.
730 730
mV
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
-1.4
-1
-2.7
-2
-1.4
-1
-2.7
-2
mV/V
Iref
Reference Input Current
Ik = 10mA, R1 = 10kΩ, R2 = ∞
T
amb
= 25°C
T
min
≤T
amb
≤T
max
1.8 4
6.5
1.8 4
6.5
µA
∆Iref
Reference Input Current Deviation Over Temperature
Range
Ik = 10mA, R1 = 10kΩ, R2 =∞
T
min
≤T
amb
≤ T
max
0.82.5 0.81.2
µA
Imin
Minimum Cathode Current for Regulation
V
KA
= V
ref
0.5 1 0.5 0.7
mA
Ioff Off-State Cathode Current 2.6 1000 2.6 1000 nA
⏐ZKA⏐
Dynamic Impedance
(2)
V
KA
= V
ref
, ∆ Ik = 1 to100mA, f ≤1kHZ
2. The dynamic Impedance is definied as |ZKA|
=
0.22 0.5 0.22 0.5
Ω
T1
T2
Temperature
V
ref max.
V
ref min.
∆Vref
∆Vka
------------
∆VKA
∆IK
---------------- -