TL431, TL431A, TL431B
TL432, TL432A, TL432B
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SLVS543M –AUGUST 2004–REVISED JULY 2012
ELECTRICAL CHARACTERISTICS
over recommended operating conditions, TA = 25°C (unless otherwise noted)
TL431BQ, TL432BQ
UNIT
PARAMETER
TEST CIRCUIT
TEST CONDITIONS
VKA = Vref, IKA = 10 mA
VKA = Vref, IKA = 10 mA
MIN
TYP
MAX
Vref
Reference voltage
Figure 4
2483
2495
2507
mV
mV
Deviation of reference input
voltage over full temperature
range(1)
VI(dev)
Figure 4
14
34
Ratio of change in reference
voltage to the change in
cathode voltage
ΔVKA = 10 V − Vref
ΔVKA = 36 V − 10 V
-1.4
-1
-2.7
-2
ΔVref
ΔVKA
/
Figure 5
Figure 5
Figure 5
IKA = 10 mA
mV/V
µA
Iref
Reference input current
IKA = 10 mA, R1 = 10 kΩ, R2 = ∞
IKA = 10 mA, R1 = 10 kΩ, R2 = ∞
2
4
Deviation of reference input
current over full temperature
range(1)
II(dev)
0.8
2.5
µA
Minimum cathode current for
regulation
Imin
Figure 4
VKA = Vref
0.4
0.7
mA
Ioff
|zKA
Off-state cathode current
Dynamic impedance(2)
Figure 6
Figure 4
VKA = 36 V, Vref = 0
0.1
0.2
0.5
0.5
µA
|
VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA
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 αVref is defined as:
αVref 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 5), the total dynamic impedance of the circuit is given by:
R1
R2
|z |
1 +
KA
(
.
which is approximately equal to
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