Data Sheet

LM431SA / LM431SB / LM431SC — Programmable Shunt Regulator
Typical Performance Characteristics
Figure 10. Cathode Current vs. Cathode Voltage
Figure 11. Cathode Current vs. Cathode Voltage
Figure 12. OFF-State Cathode Current vs.
Ambient Temperature
Figure 13. Reference Input Current vs.
Ambient Temperature
Figure 14. Frequency vs. Small Signal Voltage
Amplification
Figure 15. Pulse Response
-2 -1 0 1 2 3
-100
-50
0
50
100
150
V
KA
= V
REF
T
A
= 25
o
C
I
K
, Cathode Current (mA)
V
KA
, Cathode Voltage (V)
I
K
- Cathode Current (mA)
V
KA
- Cathode Voltage (V)
-10123
-200
0
200
400
600
800
I
KA(MIN)
V
KA
= V
REF
T
A
= 25
o
C
I
KA
, CATHODE CURRENT (uA)
V
KA
, CATHODE VOLTAGE (V)
I
KA
- Cathode Current (μA)
V
KA
- Cathode Voltage (V)
-50 -25 0 25 50 75 100 125 150
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
I
off
, Off-State Cathode Current (uA)
T
A
, Ambient Temperature (
o
C)
I
off
- Off-State Cathode Current (μA)
T
A
- Ambient Temperature (
o
C)
-50 -25 0 25 50 75 100 125
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
I
ref
, Reference Input Current (uA)
T
A
, Ambient Temperature (
o
C)
T
A
- Ambient Temperature (
o
C)
I
ref
- Reference Input Current (μA)
1k 10k 100k 1M 10M
-10
0
10
20
30
40
50
60
T
A
= 25
o
C
I
KA
= 10mA
Open Loop Voltage Gain (dB)
Frequency (Hz)
Open Loop Voltage Gain (dB)
Frequency (Hz)
048121620
0
1
2
3
4
5
6
T
A
=25
o
C
OUTPUT
INPUT
Voltage Swing (V)
Time (us)
Time (μs)
Voltage Swing (V)
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