TL431, TL431A, TL431B
TL432, TL432A, TL432B
SLVS543K –AUGUST 2004–REVISED JUNE 2010
www.ti.com
ELECTRICAL CHARACTERISTICS
over recommended operating conditions, TA = 25°C (unless otherwise noted)
TL431AC, TL432AC
PARAMETER
TEST CIRCUIT
TEST CONDITIONS
UNIT
MIN
TYP
MAX
Vref
Reference voltage
Figure 1
VKA = Vref, IKA = 10 mA
SOT23-3 and TL432
VKA = Vref,
2470
2495
2520
mV
Deviation of reference input
voltage over full temperature
range(1)
6
16
devices
VI(dev)
Figure 1
IKA = 10 mA,
mV
TA = 0°C to 70°C
All other devices
ΔVKA = 10 V − Vref
4
25
Ratio of change in reference
voltage to the change in
cathode voltage
-1.4
-2.7
ΔVref
ΔVKA
/
Figure 2
Figure 2
Figure 2
IKA = 10 mA
mV/V
µA
ΔVKA = 36 V − 10 V
-1
2
-2
4
Iref
Reference input current
IKA = 10 mA, R1 = 10 kΩ, R2 = ∞
Deviation of reference input
current over full temperature
range(1)
IKA = 10 mA, R1 = 10 kΩ, R2 = ∞,
TA = 0°C to 70°C
II(dev)
0.8
1.2
µA
Minimum cathode current for
regulation
Imin
Figure 1
VKA = Vref
0.4
0.6
mA
Ioff
|zKA
Off-state cathode current
Dynamic impedance(2)
Figure 3
Figure 1
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 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
14
Submit Documentation Feedback
Copyright © 2004–2010, Texas Instruments Incorporated
Product Folder Link(s): TL431 TL431A TL431B TL432 TL432A TL432B