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參數(shù)資料
| 型號： | LT338A |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 5A Positive Adjustable Voltage Regulator |
| 中文描述： | 5A條正，可調(diào)式電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 185K |
| 代理商： | LT338A |
3
LT138A/LT338A
LM138/LM338
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
A
= 25
°
C. (Note 2)
The
G
denotes specifications which apply over the full operating
LT138A
TYP
1
LM138
TYP
1
SYMBOL
V
OUT
Temp
V
OUT
Time
e
n
θ
JC
PARAMETER
Temperature Stability
CONDITIONS
MIN
MAX
2
MIN
MAX
UNITS
G
%
Long-Term Stability
T
A
= 125
°
C, 1000 Hours
0.3
1
0.3
1
%
RMS Output Noise (% of V
OUT
) 10Hz
≤
f
≤
10kHz
Thermal Resistance
Junction-to-Case
0.001
0.003
%
K Package
1
1
°
C/W
The
G
denotes specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25
°
C. (Note 2)
LT338A
TYP
1.250
1.250
LM338
TYP
SYMBOL
V
REF
PARAMETER
Reference Voltage
CONDITIONS
I
OUT
= 10mA
3V
≤
(V
IN
– V
OUT
)
≤
35V,
10mA
≤
I
OUT
≤
5A, P
≤
50W
3V
≤
(V
IN
– V
OUT
)
≤
35V, (Note 3)
MIN
1.238
1.225
MAX
1.262
1.270
MIN
MAX
UNITS
V
V
G
1.19
1.24
1.29
V
OUT
V
IN
V
OUT
I
OUT
Line Regulation
0.005
0.02
0.01
0.04
0.005
0.02
0.03
0.06
%/V
%/V
G
Load Regulation
10mA
≤
I
OUT
≤
5A, (Note 3)
V
OUT
≤
5V
V
OUT
≥
5V
V
OUT
≤
5V
V
OUT
≥
5V
20ms Pulse
V
OUT
= 10V, f = 120Hz
C
ADJ
= 0
μ
F
C
ADJ
= 10
μ
F
5
15
0.3
30
0.6
0.02
5
25
0.5
50
1
0.02
mV
%
mV
%
%/W
0.1
20
0.3
0.002
0.1
20
0.3
0.002
G
G
Thermal Regulation
Ripple Rejection
G
G
60
75
45
0.2
60
75
45
0.2
dB
dB
μ
A
μ
A
60
60
I
ADJ
I
ADJ
Adjust Pin Current
Adjust Pin Current Change
G
100
5
100
5
10mA
≤
I
OUT
≤
5A,
3V
≤
(V
IN
– V
OUT
)
≤
35V
(V
IN
– V
OUT
) = 35V
(V
IN
– V
OUT
)
≤
10V
DC
0.5ms Peak
(V
IN
– V
OUT
) = 30V, T
J
= 25
°
C
G
Minimum Load Current
Current Limit
G
3.5
10
3.5
10
mA
I
SC
G
G
5
6
8
5
6
8
A
A
A
12
1
1
12
1
1
2
2
V
OUT
Temp
V
OUT
Time
e
n
θ
JC
Temperature Stability
G
%
Long-Term Stability
T
A
= 125
°
C, 1000 Hours
0.3
1
0.3
1
%
RMS Output Noise (% of V
OUT
)
Thermal Resistance
Junction-to-Case
10Hz
≤
f
≤
10kHz
K Package
0.001
0.003
%
1
1
°
C/W
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
Unless otherwise specified, these specifications apply:
V
IN
– V
OUT
= 5V and I
OUT
= 2.5A. These specifications are applicable for
power dissipations up to 50W.
Note 3:
See thermal regulation specifications for changes in output voltage
due to heating effects. Load and line regulation are measured at a constant
junction temperature by low duty cycle pulse testing.
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