TL431, A, B Series, NCV431A
3.0
VOLTAGE SWING (V)
2.0
1.0
0
5.0
0
0
4.0
Input
8.0
t, TIME (ms)
12
16
20
T
A
= 25°C
Output
140
Input
Monitor
Pulse
Generator
f = 100 kHz
220 Output
50
GND
120
I K, CATHODE CURRENT (mA)
100
80
60
40
20
0
1.0 nF
A
1.0
mF
Stable
B
D
B
A
10
mF
100
mF
Stable
Unstable
Area
A
B
C
D
Programmed
V
KA
(V)
V
ref
5.0
10
15
C
T
A
= 25°C
10 nF
100 nF
C
L
, LOAD CAPACITANCE
Figure 14. Pulse Response
Figure 15. Stability Boundary Conditions
150
I
K
V+
C
L
V+
150
I
K
10 k
C
L
Figure 16. Test Circuit For Curve A
of Stability Boundary Conditions
Figure 17. Test Circuit For Curves B, C, And D
of Stability Boundary Conditions
TYPICAL APPLICATIONS
V+
R1
V
out
V+
R1
V
out
R2
R2
V out
+
1
)
R1 V
R2 ref
1
)
R1 V
R2 ref
V out
+
Figure 18. Shunt Regulator
Figure 19. High Current Shunt Regulator
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