TL431, TL431A, TL431B
TL432, TL432A, TL432B
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SLVS543K –AUGUST 2004–REVISED JUNE 2010
ELECTRICAL CHARACTERISTICS
over recommended operating conditions, TA = 25°C (unless otherwise noted)
TL431Q, TL432Q
UNIT
PARAMETER
TEST CIRCUIT
TEST CONDITIONS
VKA = Vref, IKA = 10 mA
MIN
TYP
MAX
Vref
Reference voltage
Figure 1
2440
2495
2550
mV
mV
Deviation of reference input
voltage over full temperature
range(1)
VI(dev)
Figure 1
VKA = Vref, IKA = 10 mA, TA = 0°C to 70°C
14
34
Ratio of change in reference
voltage to the change in
cathode voltage
ΔVKA = 10 V − Vref
-1.4
-1
-2.7
-2
ΔVref
ΔVKA
/
Figure 2
Figure 2
Figure 2
IKA = 10 mA
mV/V
µA
ΔVKA = 36 V − 10 V
Iref
Reference input current
IKA = 10 mA, R1 = 10 kΩ, R2 = ∞
2
4
Deviation of reference input
current over full temperature
range(1)
IKA = 10 mA, R1 = 10 kΩ, R2 = ∞,
II(dev)
0.8
2.5
µA
TA = 0°C to 70°C
Minimum cathode current for
regulation
Imin
Figure 1
VKA = Vref
0.4
1
mA
Ioff
|zKA
Off-state cathode current
Dynamic impedance(2)
Figure 3
Figure 1
VKA = 36 V, Vref = 0
0.1
0.2
1
µA
|
VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA
0.5
Ω
(1) The deviation parameters Vref(dev) and Iref(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 aVref is defined as:
V
(
I dev
)
× 106
(
(
V
at 25°C
Maximum Vref
ref
ppm
aV
ref
=
(
(
TA
°C
V
I(dev)
where:
DT is the rated operating temperature range of the device.
A
Minimum Vref
∆T
A
aVref is positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the lower temperature.
∆VKA
∆IKA
|zKA| =
(2) The dynamic impedance is defined as:
∆V
∆I
|z'| =
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by:
R1
R2
|z |
1 +
KA
(
.
which is approximately equal to
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