TL431, A, B Series, NCV431A
V+
V
out
V+
l
R1
R2
R3
V
out
V
in
R4
V
V
out
in
V
th
= V
ref
L.E.D. indicator is ‘on’ when V+ is between the
upper and lower limits.
< V
> V
V+
≈ 2.0 V
ref
ref
R1
R2
LowerꢀLimit +ꢀ ǒ1 ) ǓꢀV
ref
ref
R3
UpperꢀLimit +ꢀ ǒ1 ) ǓꢀV
R4
Figure 26. Voltage Monitor
Figure 27. Single−Supply Comparator with
Temperature−Compensated Threshold
25 V
1N5305
38 V
2.0 mA
330
T = 330 to 8.0 W
l
T
5.0 k
1%
50 k 500 k
5.0 M
1%
10 k
Calibrate
I
+
1%
1%
470 mF
8.0 W
10 kW
V
360 k
100 kW
V
25 V
1.0 MW
V
1.0 mF
1.0 kW
V
−
*
LM11
V
out
Range
Volume
47 k
+
0.05 mF
Tone
*Thermalloy
*THM 6024
*Heatsink on
*LP Package
−5.0 V
R
X
56 k
10 k
25 k
W
V
R
x
+ V ꢀDꢀꢀ ꢀ Range
out
Figure 28. Linear Ohmmeter
Figure 29. Simple 400 mW Phono Amplifier
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