TL1431 Datasheet, PDF (4/28 Pages) STMicroelectronics – PROGRAMMABLE VOLTAGE REFERENCE

TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062L – DECEMBER 1991 – REVISED OCTOBER 2007
Recommended Operating Conditions
V_KA
Cathode voltage
I_KA
Cathode current
T_A
Operating free-air temperature
TL1431C
TL1431Q
TL1431M
www.ti.com
MIN
V_I(ref)
1
0
–40
–55
MAX
36
100
70
125
125
UNIT
V
mA
°C
Electrical Characteristics
at specified free-air temperature, I_KA = 10 mA (unless otherwise noted)
PARAMETER
TEST CONDITIONS
T_A ⁽¹⁾
V_I(ref)
V_I(dev)
∆V_I(ref)
∆V_KA
I_I(ref)
I_I(dev)
I_min
I_off
|z_KA|
Reference input voltage
V_KA = V_I(ref)
Deviation of reference input
voltage over full temperature V_KA = V_I(ref)
range ⁽²⁾
Ratio of change in reference
input voltage to the change in ΔV_KA = 3 V to 36 V
cathode voltage
Reference input current
R1 = 10 kΩ, R2 = ∞
Deviation of reference input
current over full temperature
range ⁽²⁾
Minimum cathode current for
regulation
R1 = 10 kΩ, R2 = ∞
V_KA = V_I(ref)
Off-state cathode current
Output impedance⁽³⁾
V_KA = 36 V, V_I(ref) = 0
V_KA = V_I(ref), f ≤ 1 kHz,
I_KA = 1 mA to 100 mA
25°C
Full range
Full range
Full range
25°C
Full range
Full range
25°C
25°C
Full range
25°C
TEST
CIRCUIT
Figure 1
Figure 1
Figure 2
Figure 2
Figure 2
Figure 1
Figure 3
Figure 1
TL1431C
MIN
TYP
2490
2500
2480
4
MAX
2510
2520
UNIT
mV
20 mV
–1.1
–2 mV/V
1.5
2.5
μA
3
0.2
1.2 μA
0.45
1 mA
0.18
0.5
μA
2
0.2
0.4 Ω
(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)
( ppm
°C ⁼
( ^VI(dev)
° ^{VI(ref) at 25 C}
T_A
× 10⁶
Max V_I(ref)
where:
∆T_A is the rated operating temperature range of the device.
V_I(dev)
Min V_I(ref)
˙T_A
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)
The
output
impedance
is
defined
as:
|z_KA|
=
∆V_KA
∆I_KA
When
the
device
is
operating
with
two
external
resistors
(see
Figure
2),
the
total
dynamic
impedance
of
the
circuit
is
given
by:
|z'|
=
∆V
∆I ,
( _{which is approximately equal to}
|z_KA|
1+
R1
R2
.
4
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