Electrical characteristics
TL431
3
Table 3.
Symbol
Electrical characteristics
T
amb
= 25°C (unless otherwise specified)
TL431C
Parameter
Min.
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
(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
I
k
= 10mA -
ΔV
KA
= 10V to V
ref
ΔV
KA
= 36V to 10V
Reference input current
I
k
= 10mA, R1 = 10kΩ R2 =
∞
,
T
amb
= 25°C
T
min
≤
T
amb
≤
T
max
Reference input current deviation over temperature
range
,
I
k
= 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
(2)
V
KA
= V
ref
,
Δ
I
k
= 1 to100mA, f
≤
1kHZ
Typ.
Max.
Min.
Typ.
Max.
TL431AC
Unit
V
ref
2.44 2.495 2.55 2.47 2.495 2.52
2.423
2.567 2.453
2.537
V
ΔV
ref
mV
3
17
3
15
ΔVref
------------
ΔVka
-2.7
-2
-1.4
-1
-2.7
-2
-1.4
-1
mV/V
I
ref
1.8
4
5.2
1.8
4
5.2
µA
ΔI
ref
µA
0.4
0.5
2.6
0.22
1.2
1
1000
0.5
0.4
0.5
2.6
0.22
1.2
0.6
1000
0.5
mA
nA
Ω
I
min
I
off
⏐
ZKA⏐
1. See definition of
ΔV
KA
2. The dynamic impedance is defined as
|
ZKA
|
=
---------------
Δ
I
k
4/15
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