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參數(shù)資料
| 型號： | LT338AK |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 5A Positive Adjustable Voltage Regulator |
| 中文描述： | 1.2 V-32 V ADJUSTABLE POSITIVE REGULATOR, MBFM2 |
| 封裝： | METAL CAN, TO-3, 3 PIN |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 185K |
| 代理商： | LT338AK |
5
LT138A/LT338A
LM138/LM338
TYPICAL PERFOR U
Current Limit
Current Limit
Current Limit
INPUT-OUTPUT DIFFERENTIAL (V)
0
O
8
12
40
138A/338A G10
4
0
10
20
30
16
PEAK CURRENT LIMIT
DC CURRENT LIMIT
T
CASE
= 25
°
C
PRELOAD = 0A
PRELOAD = 1A
PRELOAD = 5A
TIME (ms)
0.1
8
O
10
12
14
1
10
100
138A/338A G11
6
4
2
0
PRELOAD = 0A
PRELOAD = 5A
V
IN
= 10V
V
OUT
= 5V
T
CASE
= 25
°
C
TIME (ms)
0.1
8
O
10
12
14
1
10
100
138A/338A G12
6
4
2
0
PRELOAD CURRENT = 0
T
CASE
= 25
°
C
V
IN
– V
OUT
= 10V
V
IN
– V
OUT
= 15V
V
IN
– V
OUT
= 20V
V
IN
– V
OUT
= 30V
Line Transient Response
TIME (
μ
s)
0
0
O
D
I
C
0.5
–1.5
–1.0
–0.5
20
30
1.5
138A/338A G13
1.0
10
40
0
0.5
1.0
C
L
= 1
μ
F
C
L
= 10
μ
F
C
OUT
= 0
C
ADJ
= 0
V
OUT
= 10V
I
OUT
= 50mA
T
J
= 25
°
C
Load Transient Response
TIME (
μ
s)
0
O
D
L
2
6
–3
–2
3
0
20
40
138A/338A G14
4
1
2
–1
0
10
30
V
IN
= 15V
V
OUT
= 10V
T
= 25
°
C
PRELOAD = 100mA
C
L
= 1
μ
F
C
ADJ
= 10
μ
F
C
L
= 0
C
ADJ
= 0
APPLICATIO
S I
FOR
ATIO
U
General
The LT138A develops a 1.25V reference voltage between
the output and the adjustable terminal (see Figure 1). By
placing a resistor, R1, between these two terminals, a con-
stant current is caused to flow through R1 and down through
R2 to set the overall output voltage. Normally this current
is the specified minimum load current of 5mA or 10mA.
Because I
ADJ
is very small and constant when compared
with the current through R1, it represents a small error and
can usually be ignored. It is easily seen from the output
voltage equation, that even if the resistors were of exact
value, the accuracy of the output is limited by the accuracy
of V
REF
. Earlier adjustable regulators had a reference
W
U
U
tolerance of
±
4% which is dangerously close to the
±
5%
supply tolerance required in many logic and analog sys-
tems. Further, even 1% resistors can drift 0.01%/
°
C, add-
ing additional error to the output voltage tolerance.
Figure 1. Basic Adjustable Regulator
LT338A
V
IN
R1
138A/338A F01
V
OUT
I
ADJ
50
μ
A
ADJ
V
REF
V
OUT
V
IN
R2
V
OUT
= V
REF
R2
R1
1 +
+ I
ADJ
R2
(
)
+
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相關代理商/技術參數(shù) |
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|---|---|
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