LM350
D
6
1N4002
V
in
32V
LM350
(1)
V
out1
R
SC
V
in2
LM350
(2)
V
out 2
240
Adjust 1
Current
Limit
Adjust
1K
D
1
1N4001
1N4001
D
2
5.0K
Adjust 2
Voltage
Adjust
1N4001
D
3
D
4
−10V
Diodes D
1
and D
2
and transistor Q
2
are added to allow adjustment
of output voltage to 0 V.
D
6
protects both LM350’s during an input short circuit.
Q
2
2N5640
1N4001
Output Range:
0
≤
V
O
≤
25 V
0
≤
I
O
≤
1.5 A
D
5
IN4001
+
10mF
I
O
V
O
+
1.0mF
Tantalum
V
in1
0.1mF
Q
1
2N3822
−10V
Figure 21. “Laboratory” Power Supply with Adjustable Current Limit and Output Voltage
+25V
V
in
LM350
V
out
R
1
620
V
out
I
out
D
1
D
1
1N4001
D
2
1N4001
1N4002
V
in
LM350
V
out
+
120
Adjust
MPS2222
720
1.0k
TTL
Control
1.0mF
Adjust
* To provide current limiting of I
O
to the system ground, the source of
the FET must be tied to a negative
voltage below −1.25 V.
V
ref
R
2
≤
I
DSS
R
1
=
V
ref
I
Omax
+ I
DSS
R
2
100
2N5640
V
SS
*
V
O
< V
(BR)DSS
+ 1.25 V + V
SS
I
Lmin
− I
DSS
< I
O
< 3.0 A
As shown O < I
O
< 1.0 A
Minimum V
out
= 1.25 V
D
1
protects the device during an input short circuit.
Figure 22. Adjustable Current Limiter
Figure 23. 5.0 V Electronic Shutdown Regulator
V
in
V
in
LM350
V
out
240
Adjust
R
2
MPS2907
50k
+
10mF
1N4001
Adjust
LM350
V
out
R
1
I
out
I
Adj
Iout
+
Vref
)
IAdj
R1
^
1.25 V
R
1
10 mA
≤
I
out
≤
3.0 A
Figure 24. Slow Turn−On Regulator
Figure 25. Current Regulator
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