TL431
Reference voltage vs Temperature
Reference voltage vs cathode current
100
2.54
Cathode voltage V
KA
(V)
Cathode current I
KA
(mA)
2.52
V
KA
= V
REF
I
K
= 10 mA
75
50
25
0
-25
-50
T
AMB
=+25
°
C
2.50
2.48
2.46
2.44
-40
-20
0
20
40
60
80
100
-1
0
1
2
3
Temperature (
°
C)
Cathode voltage V
KA
(V)
Reference voltage vs cathode current
Reference current vs temperature
2
2.0
Reference current I
REF
(
µ
A)
Cathode current I
KA
(mA)
1
T
AMB
= +25
°
C
1.5
I
K
=10 mA
R
1
=10k
Ω
R2= +
∝
0
1.0
-1
0.5
-2
-1
0
1
Cathode voltage V
KA
(V)
2
3
0.0
−
40
−
20
0
20
40
60
80
100
Temperature °C
Off-state cathode current vs temperature
Ratio of change in V
REF
to change in V
KA
vs
Temperature
2.0
0.0
V
KA
= 36 V
V
REF
= 0 V
Off-state current I
OFF
(
µ
A)
1.5
∆
V
REF
/
∆
V
KA
(mV / V)
-0.5
I
K
= 10 mA
1.0
-1.0
0.5
-1.5
0.0
-40
-20
0
20
40
60
80
100
-2.0
-40
-20
0
20
40
60
80
100
Temperature (
°
C)
Temperature (
°
C)
5/10