Datasheet

Electrical characteristics TL431, TL432
6/21 Doc ID 4467 Rev 11
Table 4. TL431I/TL432I (T
amb
= 25°C unless otherwise specified)
Symbol Parameter
TL431I/TL432I TL431AI/TL432AI
Unit
Min. Typ. Max. Min. Typ. Max.
V
ref
Reference input voltage
V
KA
= V
ref
, I
k
= 10 mA, T
amb
= 25° C
T
min
≤ T
amb
≤ T
max
2.44
2.41
2.495 2.55
2.58
2.47
2.44
2.495 2.52
2.55
V
ΔV
ref
Reference input voltage deviation over temperature
range
(1)
V
KA
= V
ref
, I
k
=10 mA, T
min
≤ T
amb
≤ T
max
730 730mV
Ratio of change in reference input voltage to change
in cathode to anode voltage
I
k
= 10 mA, ΔV
KA
= 10 V to V
ref
ΔV
KA
= 36 V to 10 V
-2.7
-2
-1.4
-1
-2.7
-2
-1.4
-1
mV/V
I
ref
Reference input current
I
k
= 10 mA, R1 = 10 kΩ, R2 = ∞
T
amb
= 25° C
T
min
≤ T
amb
≤ T
max
1.8 4
6.5
1.8 4
6.5
µA
ΔI
ref
Reference input current deviation over temperature
range
I
k
= 10 mA, R1 = 10 kΩ, R2 = ∞
T
min
≤ T
amb
≤ T
max
0.8 2.5 0.8 1.2 µA
I
min
Minimum cathode current for regulation
V
KA
= V
ref
0.5 1 0.5 0.7 mA
I
off
Off-state cathode current 2.6 1000 2.6 1000 nA
⏐ZKA⏐
Dynamic impedance
(2)
V
KA
= V
ref
, Δ I
k
= 1 to 100 mA, f ≤ 1kHZ
0.22 0.5 0.22 0.5 Ω
1. See definition of Section 3.1: Reference input voltage deviation over temperature range below.
2. The dynamic impedance is defined as
|ZKA| =
ΔVref
ΔVka
------------
ΔV
KA
I
k
Δ
----------------