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TL1431_08 Datasheet, PDF (4/26 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE | |||
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062L â DECEMBER 1991 â REVISED OCTOBER 2007
Recommended Operating Conditions
VKA
Cathode voltage
IKA
Cathode current
TA
Operating free-air temperature
TL1431C
TL1431Q
TL1431M
www.ti.com
MIN
VI(ref)
1
0
â40
â55
MAX
36
100
70
125
125
UNIT
V
mA
°C
Electrical Characteristics
at specified free-air temperature, IKA = 10 mA (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TA (1)
VI(ref)
VI(dev)
âVI(ref)
âVKA
II(ref)
II(dev)
Imin
Ioff
|zKA|
Reference input voltage
VKA = VI(ref)
Deviation of reference input
voltage over full temperature VKA = VI(ref)
range (2)
Ratio of change in reference
input voltage to the change in ÎVKA = 3 V to 36 V
cathode voltage
Reference input current
R1 = 10 kâ¦, R2 = â
Deviation of reference input
current over full temperature
range (2)
Minimum cathode current for
regulation
R1 = 10 kâ¦, R2 = â
VKA = VI(ref)
Off-state cathode current
Output impedance(3)
VKA = 36 V, VI(ref) = 0
VKA = VI(ref), f ⤠1 kHz,
IKA = 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
â1.1
â2 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 â¦
(1) Full range is 0°C to 70°C for C-suffix devices.
(2) The deviation parameters VI(dev) and II(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 αVI(ref) is defined as:
αVI(ref)
( ppm
°C =
( VI(dev)
° VI(ref) at 25 C
TA
à 106
Max VI(ref)
where:
âTA is the rated operating temperature range of the device.
VI(dev)
Min VI(ref)
ËTA
αVI(ref) is positive or negative, depending on whether minimum VI(ref) or maximum VI(ref), respectively, occurs at the lower temperature.
(3)
The
output
impedance
is
defined
as:
|zKA|
=
âVKA
âIKA
When
the
device
is
operating
with
two
external
resistors
(see
Figure
2),
the
total
dynamic
impedance
of
the
circuit
is
given
by:
|z'|
=
âV
âI ,
( which is approximately equal to
|zKA|
1+
R1
R2
.
4
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