Datasheet
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rated temperature range. The average full-range temperature coefficient of the reference input voltage
a
V
I(ref)
is defined as:
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)
Ť
a
V
I
(
ref
)
Ť
ǒ
ppm
°C
Ǔ
+
ǒ
V
I
(
dev
)
V
I
(
ref
)
at 25
°
C
Ǔ
10
6
DT
A
a
V
I(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:
Ť
z
KA
Ť
+
DV
KA
DI
KA
|
zȀ
|
+
DV
DI
, which is approximately equal to
Ť
z
KA
Ť
+
ǒ
1 )
R1
R2
Ǔ
.
Electrical Characteristics
DV
I(ref)
DV
KA
TL1431-EP
PRECISION PROGRAMMABLE REFERENCE
SLVS529C – APRIL 2004 – REVISED DECEMBER 2006
at specified free-air temperature, I
KA
= 10 mA (unless otherwise noted)
TEST
PARAMETER TEST CONDITIONS T
A
(1)
MIN TYP MAX UNIT
CIRCUIT
25 ° C 2490 2500 2510
V
I(ref)
Reference input voltage V
KA
= V
I(ref)
Figure 1 mV
Full range 2470 2530
Deviation of reference input
V
I(dev)
voltage over full temperature V
KA
= V
I(ref)
Full range Figure 1 17 mV
range
(2)
Ratio of change in reference
input voltage to the change in ∆ V
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 k Ω , R2 = ∞ Figure 2 µ A
Full range 4
Deviation of reference input
I
I(dev)
current over full temperature R1 = 10 k Ω , R2 = ∞ Full range Figure 2 0.5 µ A
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 µ A
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 –40 ° C to 125 ° C for Q-suffix devices; –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
When the device is operating with two external resistors (see Figure 2 ), the total dynamic impedance of the circuit is given by:
4
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