LM317L
Figure 19. Adjustable Current Limiter
Figure 20. 5 V Electronic Shutdown Regulator
D
1
V
I
O
V
R
O
+25V
out
1
LM317L
1.25k
1N4002
V
in
V
V
in
out
LM317L
Adjust
D1
1N914
R
+
2
1.0µF
120
500
D2
* To provide current limiting of I
to the system ground, the source of
the current limiting diode must be tied to
a negative voltage below – 7.25 V.
O
Adjust
720
1N914
MPS2222
1.0k
TTL
Control
1N5314
V
ref
R
R
≥
2
I
DSS
Minimum V
out
= 1.25 V
V
*
SS
V
ref
+ I
=
1
I
Omax DSS
D
protects the device during an input short circuit.
1
V
< P
OV
+ 1.25 V + V
O
SS
– I < I < 100 mA – I
P
I
Lmin
P
O
As shown O < I < 95 mA
O
Figure 21. Slow Turn–On Regulator
Figure 22. Current Regulator
I
V
V
out
out
in
V
R
R
in
1
2
LM317L
LM317L
240
1N4002
V
out
I
Adjust
50k
Adjust
Adj
R
2
MPS2907
+
10µF
V
1.25 V
R
1
ref
I
I
=
=
+ I
Adj
outmax
R
1
V
1.25 V
R + R
1
ref
+ I
outmax
Adj
R
+ R
1
2
2
5.0 mA < I
< 100 mA
out
8
MOTOROLA ANALOG IC DEVICE DATA
ONSEMI [ ONSEMI ]
