TL431, A, B Series
Figure 20. Output Control for a
Three–Terminal Fixed Regulator
Figure 21. Series Pass Regulator
V+
V
out
MC7805
Out
Common
R1
R2
V+
V
out
In
R1
R2
R1
R2
V
V
1
V
out
out
ref
R1
R2
V
V
1
V
out
out
ref
5.0V
min
V
V
ref
be
min
V
ref
Figure 22. Constant Current Source
Figure 23. Constant Current Sink
R
CL
I
V+
sink
V+
I
out
V
ref
I
Sink
R
S
V
R
ref
CL
I
out
R
S
Figure 24. TRIAC Crowbar
Figure 25. SRC Crowbar
V+
V+
V
out
V
out
R1
R1
R2
V
R2
R1
R2
V
1
out(trip)
ref
R1
R2
V
1
V
out(trip)
ref
8
MOTOROLA ANALOG IC DEVICE DATA