Datasheet
∆I
∆V
|z'| =
R2
R1
|z |
KA
(
1 +
(
∆I
KA
∆V
KA
|z | =
KA
where:
∆T
A
is the rated operating temperature range of the device.
Max V
I(ref)
Min V
I(ref)
˙T
A
V
I(dev)
α
VI(ref)
ppm
°C
V
I
(
dev
)
V
I
(
ref
)
at 25
°
C
× 10
6
T
A
(
(
=
(
(
∆V
KA
∆V
I(ref)
(3) The output impedance is defined as:
, which is approximately equal to .
TL1431
SLVS062M –DECEMBER 1991–REVISED APRIL 2012
www.ti.com
Recommended Operating Conditions
MIN MAX UNIT
V
KA
Cathode voltage V
I(ref)
36 V
I
KA
Cathode current 1 100 mA
TL1431C 0 70
T
A
Operating free-air temperature TL1431Q –40 125 °C
TL1431M –55 125
Electrical Characteristics
at specified free-air temperature, I
KA
= 10 mA (unless otherwise noted)
TL1431C
TEST
PARAMETER TEST CONDITIONS T
A
(1)
UNIT
CIRCUIT
MIN TYP MAX
25°C 2490 2500 2510
V
I(ref)
Reference input voltage V
KA
= V
I(ref)
Figure 1 mV
Full range 2480 2520
Deviation of reference input
V
I(dev)
voltage over full temperature V
KA
= V
I(ref)
Full range Figure 1 4 20 mV
range
(2)
Ratio of change in reference
input voltage to the change in ΔV
KA
= 3 V to 36 V Full range Figure 2 –1.1 –2 mV/V
cathode voltage
25°C 1.5 2.5
I
I(ref)
Reference input current R1 = 10 kΩ, R2 = ∞ Figure 2 μA
Full range 3
Deviation of reference input
I
I(dev)
current over full temperature R1 = 10 kΩ, R2 = ∞ Full range Figure 2 0.2 1.2 μA
range
(2)
Minimum cathode current for
I
min
V
KA
= V
I(ref)
25°C Figure 1 0.45 1 mA
regulation
25°C 0.18 0.5
I
off
Off-state cathode current V
KA
= 36 V, V
I(ref)
= 0 Figure 3 μA
Full range 2
V
KA
= V
I(ref)
, f ≤ 1 kHz,
|z
KA
| Output impedance
(3)
25°C Figure 1 0.2 0.4 Ω
I
KA
= 1 mA to 100 mA
(1) Full range is 0°C to 70°C for C-suffix devices.
(2) The deviation parameters V
I(dev)
and I
I(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
VI(ref)
is defined as:
α
VI(ref)
is positive or negative, depending on whether minimum V
I(ref)
or maximum V
I(ref)
, respectively, occurs at the lower temperature.
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by:
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