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