LM317M
Load Regulation (mV) = V
O
(min Load) −V
O
(max Load)
V
O
(min Load) − V
O
(max Load)
Load Regulation (% V
O
) =
V
O
(min Load)
V
in
V
in
LM317M
V
out
I
L
R
L
(max Load)
*
+
C
in
0.1mF
I
Adj
C
O
1.0mF
X 100
V
O
(min Load)
VO (max Load)
Adjust
R
1
240
1%
R
L
(min Load)
R
2
1%
* Pulse Testing Required:
1% Duty Cycle is suggested.
Figure 4. Load Regulation and
DI
Adj
/Load
Test Circuit
V
in
LM317M
V
out
I
L
Adjust
V
I
C
in
0.1mF
I
SET
R
2
1%
R
1
I
Adj
240
1%
V
ref
+
C
O
1mF
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
Assume I
SET
= 5.25 mA
Figure 5. Standard Test Circuit
24V
14V
f = 120 Hz
V
in
V
out
LM317M
V
out
= 10 V
Adjust
C
in
0.1mF
R
1
240
1%
D
1
*
1N4002
+
C
O
1.0mF
R
L
V
O
R
2
1.65K
1%
**
C
Adj
+
10mF
* D
1
Discharges C
Adj
if Output is Shorted to Ground.
**C
Adj
provides an AC ground to the adjust pin.
Figure 6. Ripple Rejection Test Circuit
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