SLVS543K – AUGUST 2004 – REVISED JUNE 2010
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ELECTRICAL CHARACTERISTICS
over recommended operating conditions, T
A
= 25°C (unless otherwise noted)
PARAMETER
V
ref
V
I(dev)
Reference voltage
Deviation of reference input
voltage over full temperature
range
(1)
Ratio of change in reference
voltage to the change in
cathode voltage
Reference input current
Deviation of reference input
current over full temperature
range
(1)
Minimum cathode current for
regulation
Off-state cathode current
Dynamic impedance
(2)
TEST CIRCUIT
TEST CONDITIONS
V
KA
= V
ref
, I
KA
= 10 mA
V
KA
= V
ref
,
I
KA
= 10 mA,
T
A
= 0°C to 70°C
I
KA
= 10 mA
SOT23-3 and TL432
devices
All other devices
ΔV
KA
= 10 V
−
V
ref
ΔV
KA
= 36 V
−
10 V
TL431I, TL432I
MIN
2440
TYP
2495
14
5
-1.4
-1
2
0.8
0.4
0.1
0.2
MAX
2550
34
50
-2.7
-2
4
2.5
1
1
0.5
mV/V
µA
µA
mA
µA
Ω
UNIT
mV
mV
ΔV
ref
/
ΔV
KA
I
ref
I
I(dev)
I
min
I
off
|z
KA
|
(1)
I
KA
= 10 mA, R1 = 10 kΩ, R2 =
∞
I
KA
= 10 mA, R1 = 10 kΩ, R2 =
∞,
T
A
= 0°C to 70°C
V
KA
= V
ref
V
KA
= 36 V, V
ref
= 0
V
KA
= V
ref
, f
≤
1 kHz, I
KA
= 1 mA to 100 mA
The deviation parameters V
ref(dev)
and I
ref(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
Vref
is defined as:
a
V
ref
(
ppm
=
°
C
(
(
V(
I dev)
Vref at 25 C
°
(
× 10
6
Maximum V
ref
T
A
V
I(dev)
Minimum V
ref
where:
DT
A
is the rated operating temperature range of the device.
∆T
A
(2)
a
Vref
is positive or negative, depending on whether minimum V
ref
or maximum V
ref
, respectively, occurs at the lower temperature.
∆V
KA
|z
KA
| =
∆I
KA
The dynamic impedance is defined as:
|z'| =
∆V
∆I
When the device is operating with two external resistors (see
the total dynamic impedance of the circuit is given by:
R1
|z
KA
| 1 +
R2
.
which is approximately equal to
(
(
12
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