LM317
V
I
V
in
LM317
V
out
I
L
R
L
(max Load)
+
*
1.0
µF
V
O
(min Load)
V
O
(max Load)
R
L
(min Load)
Adjust
C
in
0.1
µF
I
Adj
R
1
240
1%
C
O
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 2. Load Regulation and
∆I
Adj
/Load Test Circuit
V
in
LM317
V
out
I
L
Adjust
V
I
C
in
0.1
µF
I
Adj
R
1
240
1%
V
ref
C
O
+
1.0
µF
R
L
V
O
I
SET
R
2
1%
* 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 3. Standard Test Circuit
24 V
14 V
f = 120 Hz
V
in
LM317
V
out
Adjust
C
in
0.1
µF
R
1
240
1%
D
1
*
1N4002
C
O
+
1.0
µF
R
L
V
O
V
out
= 10 V
R
2
1.65 k
1%
C
Adj
+
10
µF
* D
1
Discharges C
Adj
if output is shorted to Ground.
Figure 4. Ripple Rejection Test Circuit
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