TL431-W Datasheet, PDF (12/79 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

TL431, TL431A, TL431B
TL432, TL432A, TL432B
SLVS543M – AUGUST 2004 – REVISED JULY 2012
www.ti.com
ELECTRICAL CHARACTERISTICS
over recommended operating conditions, T_A = 25°C (unless otherwise noted)
PARAMETER
TEST CIRCUIT
TEST CONDITIONS
TL431I, TL432I
UNIT
MIN TYP MAX
V_ref
V_I(dev)
Reference voltage
Deviation of reference input
voltage over full temperature
range ⁽¹⁾
Figure 4
Figure 4
V_KA = V_ref, I_KA = 10 mA
2440 2495 2550 mV
V_KA = V_ref,
I_KA = 10 mA
SOT23-3 and TL432
devices
All other devices
14
34
mV
5
50
ΔV_ref /
ΔV_KA
Ratio of change in reference
voltage to the change in
cathode voltage
Figure 5
I_KA = 10 mA
ΔV_KA = 10 V − V_ref
ΔV_KA = 36 V − 10 V
-1.4 -2.7
mV/V
-1
-2
I_ref
I_I(dev)
Reference input current
Deviation of reference input
current over full temperature
range ⁽¹⁾
Figure 5
Figure 5
I_KA = 10 mA, R1 = 10 kΩ, R2 = ∞
I_KA = 10 mA, R1 = 10 kΩ, R2 = ∞
2
4 µA
0.8 2.5 µA
I_min
Minimum cathode current for
regulation
Figure 4
V_KA = V_ref
0.4
1 mA
I_off
|z_KA|
Off-state cathode current
Dynamic impedance⁽²⁾
Figure 6
Figure 4
V_KA = 36 V, V_ref = 0
V_KA = V_ref, f ≤ 1 kHz, I_KA = 1 mA to 100 mA
0.1
1 µA
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:
(2)
α_Vref is positive or negative, depending
The dynamic impedance is defined as:
on whether
|z_KA|
=
∆V_KA
∆I_KA
minimum
V_ref
or
maximum
V_ref,
respectively,
occurs
at
the
lower
temperature.
When
the
device
is
operating
with
two
external
resistors
(see
Figure
5),
the
total
dynamic
impedance
of
the
circuit
is
given
by:
|z'|
=
∆V
∆I
( _which
is
approximately
equal
to
|z_KA|
1
+
R1
R2
.
12
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