LM337
R
2
C
in
1.0
mF
1%
C
O
+
I
Adj
R
1
120
*
V
out
R
L
(max
Load)
1.0
mF
* Pulse testing required.
1% Duty Cycle is suggested.
Adjust
−V
I
V
in
LM337
I
L
−V
O
(min Load)
−V
O
(max Load)
V
O
(min Load) − V
O
(max Load)
V
O
(min Load)
x 100
Load Regulation (mV) = V
O
(min Load) − V
O
(max Load)
Load Regulation (% V
O
) =
Figure 2. Load Regulation and
DI
Adj
/Load Test Circuit
R
2
1%
+
1.0
mF
R
L
I
Adj
V
ref
R
1
V
out
120
V
I
C
in
1.0
mF
C
O
V
O
Adjust
V
in
V
O
LM337
I
L
To Calculate R
2
:
V
ref
This assumes I
Adj
is negligible.
R
2
=
−1
R
1
* Pulse testing required.
*
1% Duty Cycle is suggested.
Figure 3. Standard Test Circuit
+
R
2
C
in
1.0
mF
Adjust
V
in
LM337
R
1
V
out
V
out
= −1.25 V
14.3 V
4.3 V
f = 120 Hz
* D
1
Discharges C
Adj
if output is shorted to Ground.
120
D
1
*
1%
C
Adj
10mF
C
O
1N4002
+
1.0
mF
R
L
V
O
Figure 4. Ripple Rejection Test Circuit
http://onsemi.com
4
ONSEMI [ ON SEMICONDUCTOR ]
