TL1431-Q1 Datasheet, PDF (4/19 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

TL1431ĆQ1
PRECISION PROGRAMMABLE REFERENCE
SLVS534B − JUNE 2004 − REVISED APRIL 2008
electrical characteristics at specified free-air temperature, I_KA = 10 mA (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TA†
TEST
CIRCUIT
MIN TYP MAX UNIT
VI(ref)
VI(dev)
Reference input voltage
Deviation of reference input
voltage over full temperature
range‡
VKA = VI(ref)
VKA = VI(ref)
25°C
2490 2500 2510
Figure 1
Full range
2470
mV
2530
Full range Figure 1
17
55 mV
DV_I(ref)
DV_KA
Ratio of change in reference
input voltage to the change in
cathode voltage
II(ref)
II(dev)
Reference input current
Deviation of reference input
current over full temperature
range‡
∆VKA = 3 V to 36 V
R1 = 10 kΩ,
R1 = 10 kΩ,
Full range Figure 2
R2 = ∞
25°C
Figure 2
Full range
R2 = ∞ Full range Figure 2
−1.1 −2 mV/V
1.5 2.5
µA
4
0.5
2 µA
Imin
Minimum cathode current for
regulation
VKA = VI(ref)
25°C Figure 1
0.45
1 mA
Ioff
Off-state cathode current
VKA = 36 V,
25°C
VI(ref) = 0 _{Full range} Figure 3
0.18 0.5
µA
2
|zKA|
Output impedance§
VKA = VI(ref), f ≤ 1 kHz,
IKA = 1 mA to 100 mA
25°C Figure 1
0.2 0.4 Ω
† _{Full range is −40°C to 125°C for Q-suffix devices.}
‡ _{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 a_VI(ref) is defined as:
ǒ Ǔ ^VI(dev)
10⁶
Ť Ťǒ _{Ǔ aVI(ref)}
ppm
°C
+
° ^{VI(ref) at 25 C}
DT_A
Max VI(ref)
where:
∆TA is the rated operating temperature range of the device.
VI(dev)
Min VI(ref)
∆TA
a_VI(ref) is positive or negative, depending on whether minimum VI(ref) or maximum VI(ref), respectively, occurs at the lower temperature.
§
The
output
impedance
is
defined
as:
Ť_zKAŤ
+
DV_KA
DI_KA
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: |z′| + ^DDVI ,
ǒ Ǔ which is approximately equal to Ťz_KAŤ
1
)
R1
R2
.
4
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