LM317
Vishay
formerly General Semiconductor
Ratings and
Characteristic Curves
(T
100
C
Adj
= 10µF
A
= 25°C unless otherwise noted)
Fig. 11 – Ripple Rejection
vs. Output Voltage
140
120
Fig. 12 – Ripple Rejection
vs. Output Current
RR -- Ripple Rejection (db)
RR -- Ripple Rejection (db)
80
Without C
Adj
60
100
80
60
40
20
0
0.01
V
I
= 15V
Vo = 10V
f = 120H
Z
T
J
= 25°C
0.1
C
Adj
= 10µF
40
V
I --
Vo = 5V
I
L
= 500mA
f = 120H
Z
T
J
= 25°C
0
5
10
15
20
25
30
35
40
Without C
Adj
20
0
1
10
V
o
-- Output Voltage (V)
I
o
-- Output Current (A)
Fig. 13 – Ripple Rejection
vs. Frequency
100
10
1
Fig. 14 – Output Impedance
V
I
= 15V
Vo = 10V
I
L
= 500mA
T
J
= 25°C
RR -- Ripple Rejection (db)
80
C
Adj
= 10µF
60
Without C
Adj
Output Impedance (Ω)
10
0
10
--1
Without C
Adj
10
--2
C
Adj
= 10µF
40
I
L
= 500mA
V
I
= 15V
Vo = 10V
T
J
= 25°C
100
1K
10K
100K
1M
20
0
10
10
--3
10
100
1K
10K
100K
1M
f -- Frequency (Hz)
f -- Frequency (Hz)
∆V
I
-- Input Voltage
∆V
o -- Output Voltage
Change (V)
Deviation (V)
Fig. 15 – Line Transient Response
3
Fig. 16 – Load Transient Response
Vo -- Output Voltage
Deviation (V)
2
1
0
--1
--2
--3
C
L
= 0 Without C
Adj
V
I
= 15V
Vo = 10V
I
NL
= 50mA
T
J
= 25°C
CL = 1µF C
Adj
= 10µF
1.5
1.0
CL = 1µF C
Adj
= 10µF
0.5
0
--0.5
--1.0
--1.5
1.0
0.5
0
0
10
20
30
40
V
I
Vo = 10V
I
L
= 50mA
T
J
= 25°C
C
L
= 0
Without C
Adj
I
L
-- Load
Current (A)
1.5
1.0
0.5
0
0
10
20
30
I
L
40
t -- Time (µs)
Document Number 74809
30-Oct-02
t -- Time (µs)
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