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)
(4) The output impedance is defined as:
, which is approximately equal to .
TL1431
www.ti.com SLVS062M –DECEMBER 1991–REVISED APRIL 2012
Electrical Characteristics
at specified free-air temperature, I
KA
= 10 mA (unless otherwise noted)
TL1431Q TL1431M
TEST
PARAMETER TEST CONDITIONS T
A
(1)
UNIT
CIRCUIT
MIN TYP MAX MIN TYP MAX
25°C 2490 2500 2510 2475 2500 2540
V
I(ref)
Reference input voltage V
KA
= V
I(ref)
Figure 1 mV
Full
2470 2530 2460 2550
range
Deviation of reference
Full
V
I(dev)
input voltage over full V
KA
= V
I(ref)
Figure 1 17 55 17 55
(3)
mV
range
temperature range
(2)
Ratio of change in
reference input voltage Full
ΔV
KA
= 3 V to 36 V Figure 2 –1.1 –2 –1.1 –2 mV/V
to the change in range
cathode voltage
25°C 1.5 2.5 1.5 2.5
I
I(ref)
Reference input current R1 = 10 kΩ, R2 = ∞ Figure 2 μA
Full
4 5
range
Deviation of reference
Full
I
I(dev)
input current over full R1 = 10 kΩ, R2 = ∞ Figure 2 0.5 2 0.5 3
(3)
μA
range
temperature range
(2)
Minimum cathode
I
min
V
KA
= V
I(ref)
25°C Figure 1 0.45 1 0.45 1 mA
current for regulation
25°C 0.18 0.5 0.18 0.5
Off-state cathode
I
off
V
KA
= 36 V, V
I(ref)
= 0 Figure 3 μA
Full
current
2 2
range
V
KA
= V
I(ref)
, f ≤ 1 kHz,
|z
KA
| Output impedance
(4)
25°C Figure 1 0.2 0.4 0.2 0.4 Ω
I
KA
= 1 mA to 100 mA
(1) Full range is –40°C to 125°C for Q-suffix devices and –55°C to 125°C for M-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.
(3) On products compliant to MIL-PRF-38535, this parameter is not production tested.
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by:
Copyright © 1991–2012, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: TL1431