Datasheet

R2
R1
|z |
KA
(
1 +
(
∆I
∆V
|z'| =
∆I
KA
∆V
KA
|z | =
KA
(2) The dynamic impedance is defined as:
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by:
which is approximately equal to .
TL431, TL431A, TL431B, TL432, TL432A, TL432B
SLVS543N –AUGUST 2004–REVISED JANUARY 2014 www.ti.com
Electrical Characteristics
over recommended operating conditions, T
A
= 25°C (unless otherwise noted)
TL431AQ, TL432AQ
PARAMETER TEST CIRCUIT TEST CONDITIONS UNIT
MIN TYP MAX
V
ref
Reference voltage Figure 1 V
KA
= V
ref
, I
KA
= 10 mA 2470 2495 2520 mV
Deviation of reference input
V
I(dev)
voltage over full temperature Figure 1 V
KA
= V
ref
, I
KA
= 10 mA 14 34 mV
range
(1)
Ratio of change in reference ΔV
KA
= 10 V − V
ref
-1.4 -2.7
ΔV
ref
/
voltage to the change in Figure 2 I
KA
= 10 mA mV/V
ΔV
KA
ΔV
KA
= 36 V − 10 V -1 -2
cathode voltage
I
ref
Reference input current Figure 2 I
KA
= 10 mA, R1 = 10 kΩ, R2 = ∞ 2 4 µA
Deviation of reference input
I
I(dev)
current over full temperature Figure 2 I
KA
= 10 mA, R1 = 10 kΩ, R2 = ∞ 0.8 2.5 µA
range
(1)
Minimum cathode current for
I
min
Figure 1 V
KA
= V
ref
0.4 0.7 mA
regulation
I
off
Off-state cathode current Figure 3 V
KA
= 36 V, V
ref
= 0 0.1 0.5 µA
|z
KA
| Dynamic impedance
(2)
Figure 1 V
KA
= V
ref
, f ≤ 1 kHz, I
KA
= 1 mA to 100 mA 0.2 0.5 Ω
(1) The deviation parameters V
ref(dev)
and I
ref(dev)
are defined as the differences between the maximum and minimum values obtained over
the rated temperature range. The average full-range temperature coefficient of the reference input voltage α
Vref
is defined as:
α
Vref
is positive or negative, depending on whether minimum V
ref
or maximum V
ref
, respectively, occurs at the lower temperature.
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