LM317L
14.30V
4.30V
f = 120 Hz
V
in
LM317L
V
out
V
out
= 1.25 V
Adjust
C
in
0.1mF
R
1
240
1%
D
1
*
1N4002
+
C
O
1mF
R
L
V
O
R
2
1.65K
1%
+
**
10mF
* D
1
Discharges C
Adj
if Output is Shorted to Ground.
**C
Adj
provides an AC ground to the adjust pin.
Figure 4. Ripple Rejection Test Circuit
Δ
V out, OUTPUT VOLTAGE CHANGE (%)
0.4
0.2
0
−0.2
−0.4
−0.6
−0.8
−1.0
−50
−25
RR, RIPPLE REJECTION (dB)
V
in
= 45 V
V
out
= 5.0 V
I
L
= 5.0 mA to 40 mA
80
70
I
L
= 40 mA
f = 120 Hz
V
out
= 10 V
V
in
= 14 V to 24 V
V
in
= 10 V
V
out
= 5.0 V
I
L
= 5.0 mA to 100 mA
60
50
0
25
50
75
100 125
T
J
, JUNCTION TEMPERATURE (°C)
150
−50
−25
0
25
50
75
100 125
T
J
, JUNCTION TEMPERATURE (°C)
150
Figure 5. Load Regulation
Figure 6. Ripple Rejection
0.50
T
J
= 25°C
IO, OUTPUT CURRENT (A)
0.40
0.30
0.20
0.10
0
T
J
= 150°C
V in −Vout , INPUT−OUTPUT VOLTAGE
DIFFERENTIAL (V)
2.5
2.0
I
L
= 100 mA
1.5
I
L
= 5.0 mA
1.0
0
10
20
30
40
V
in
−V
out
, INPUT−OUTPUT VOLTAGE DIFFERENTIAL (V)
50
0.5
−50
−25
0
25
50
75
100 125
T
J
, JUNCTION TEMPERATURE (°C)
150
Figure 7. Current Limit
Figure 8. Dropout Voltage
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