Datasheet

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