Shunt Regulator
LM431L
Electrical Characteristics (TA=25ºC, unless otherwise specified)
Symbol
VREF
Description
Reference Input
Voltage
LM431L
Min. Typ. Max.
LM431LA
Min. Typ. Max.
LM431LB
Min. Typ. Max.
Unit
Test
Circuit
Conditions
1.222 1.240 1.258 1.228 1.240 1.252 1.234 1.240 1.246 V
Fig.1
VKA=VREF,IKA=10mA
0-70° C
-
-
-
-
2
1-
-
2
10
Reference
∆VREF
Input
Voltage
-40-85
°C
-
7.0
20
-
3
10
-
3
10
mV
Fig.1
(Note1)
VKA=VREF,IKA=10mA
Deviation
-40-125
°C
-
-
-
-
4
15
-
4
15
Ratio of Change in
Reference Input
∆VREF/∆VKA Voltage to Change in
Cathode to Anode
-
-0.6 -1.5
-
-0.5 -1.5
-
-0.5 -1.5 mV/V Fig.2
IKA=
10mA
∆VKA=
VKA(max)
~VREF
Voltage
IREF
Reference
Input
Current
Ta=25°
C
-
0.15 0.3
-
0.15 0.4
-
0.15 0.4
µA
Fig.2
IKA=10mA, R1=10KΩ,
R2=∞
∆IREF
Reference Input
Current Deviation
Over Temperature
Range
-
0.05 0.08
-
0.1 0.4
-
0.1
0.4
µA
Fig.2
IKA=10mA, R1=10KΩ,
R2=∞
IMIN
Min. Cathode Current
For Regulation
-
55
80
-
55
80
-
55
80
µA
Fig.1
VKA=VREF
IOFF
ZKA
Off-State Cathode
Current
Dynamic Impedance
-
2.6 1000
-
40 100
-
40 100
nA
Fig.3
-
-
-
-
10
50
-
10
50
VKA= VKA(max),
VREF=0V
VKA=6V, VREF=0V
-
0.22 0.4
-
0.05 0.15
-
0.05 0.15
Ω
Fig.1
(Note2)
VKA=VREF,
IKA=1.0mA~ IKA(max),
f≤1.0KHz
Fig.1- Test Circuit for VKA=VREF
Fig.2- Test Circuit for VKA>VREF
www.taitroncomponents.com
Rev. A/DX 2007-06-04
Page 4 of 13