LM317, NCV317
V
I
V
in
LM317
V
out
I
L
R
L
(max Load)
*
+
C
in
0.1
mF
I
Adj
C
O
1.0
mF
V
O
(min Load)
V
O
(max Load)
R
L
(min Load)
Adjust
R
1
240
1%
R
2
1%
* Pulse testing required.
*
1% Duty Cycle is suggested.
Load Regulation (mV) = V
O
(min Load) − V
O
(max Load)
Load Regulation (% V
O
) =
V
O
(min Load) − V
O
(max Load)
V
O
(min Load)
x 100
Figure 4. Load Regulation and
DI
Adj
/Load Test Circuit
V
in
LM317
V
out
I
L
Adjust
V
I
C
in
0.1
mF
I
SET
R
2
1%
R
1
I
Adj
240
1%
V
ref
+
C
O
1.0
mF
R
L
V
O
* Pulse testing required.
*
1% Duty Cycle is suggested.
To Calculate R
2
: V
out
= I
SET
R
2
+ 1.250 V
To Calculate R
2
:
Assume I
SET
= 5.25 mA
Figure 5. Standard Test Circuit
24 V
14 V
f = 120 Hz
V
in
LM317
V
out
Adjust
C
in
0.1
mF
R
1
240
1%
D
1
*
1N4002
+
C
O
1.0
mF
R
L
V
O
V
out
= 10 V
R
2
1.65 k
1%
+
C
Adj
10
mF
* D
1
Discharges C
Adj
if output is shorted to Ground.
Figure 6. Ripple Rejection Test Circuit
http://onsemi.com
4
ONSEMI [ ON SEMICONDUCTOR ]
