TL431, A, B Series, NCV431A, B
V+
V+
In
MC7805
Out
Common
R1
V
out
R1
V
out
R2
R2
1
)
R1 V
R2 ref
+
V
ref
)
5.0 V
V out
+
V
in(min)
V
1
)
R1 V
R2 ref
+
V out
)
V
+
V
ref
be
V out
+
V
out(min)
out(min)
Figure 20. Output Control for a
Three−Terminal Fixed Regulator
Figure 21. Series Pass Regulator
V+
R
CL
I
out
V+
I
sink
I
V
I out
+
ref
R
CL
V
+
ref
Sink
R
S
R
S
Figure 22. Constant Current Source
Figure 23. Constant Current Sink
V+
R1
V
out
V+
R1
V
out
R2
R2
V
out(trip)
+
1
)
R1 V
R2 ref
V
out(trip)
1
)
R1 V
R2 ref
+
Figure 24. TRIAC Crowbar
Figure 25. SRC Crowbar
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