TL431, A, B Series, NCV431A
V+
l
R1
R3
V
out
V+
V
out
V
in
R2
R4
V
th
= V
ref
V
in
< V
ref
> V
ref
V
out
V+
≈
2.0 V
L.E.D. indicator is ‘on’ when V+ is between the
upper and lower limits.
Lower Limit
+
Upper Limit
+
1
)
R1 V
R2 ref
1
)
R3 V
R4 ref
Figure 26. Voltage Monitor
Figure 27. Single−Supply Comparator with
Temperature−Compensated Threshold
25 V
1N5305
2.0 mA
10 k
Calibrate
25 V
−
LM11
+
−5.0 V
R x
+
V out
D
W
Range
V
T
l
= 330 to 8.0
W
T
I
8.0
W
38 V
330
5.0 k
1%
50 k
1%
10 kW
V
500 k
1%
5.0 M
1%
+
360 k
1.0
mF
470
mF
1.0 kW
V
R
X
100 kW
1.0 MW
V
V
Range
V
out
* Thermalloy
*
THM 6024
*
Heatsink on
*
LP Package
*
0.05
mF
Tone
25 k
Volume
47 k
56 k
10 k
Figure 28. Linear Ohmmeter
Figure 29. Simple 400 mW Phono Amplifier
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