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參數(shù)資料
| 型號(hào)： | LT338AK |
| 廠(chǎng)商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 基準(zhǔn)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(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 185K |
| 代理商： | LT338AK |
7
LT138A/LT338A
LM138/LM338
APPLICATIO
S I
N
FOR
ATIO
U
negative side of the load. Although it may not be immedi-
ately obvious, best load regulation is obtained when the
top of the resistor divider, R1, is connected directlyto the
case not to the load This is illustrated in Figure 3 If R1
were connected to the load, the effective resistance be-
tween the regulator and the load would be:
W
U
R
R
R
R
R
ParasiticLine
sis
ce
P
P
2
1
1
+
=
,
Re
tan
Connected as shown, R
P
is not multiplied by the divider
ratio. R
P
is about 0.004
per foot using 16 gauge wire.
This translates to 4mV/ft at 1A load current, so it is
important to keep the positive lead between regulator and
load as short as possible, and use large wire or PC board
traces.
LT338A
R
PARASITIC
LINE RESISTANCE
V
IN
R1
CONNECT
R1 TO CASE
CONNECT
R2 TO LOAD
138A/338A F03
V
OUT
ADJ
V
IN
R
L
R2
Figure 3. Connections for Best Load Regulation
TYPICAL APPLICATIO
N
S
Improving Ripple Rejection
LT338A
V
IN
R1
121
1%
R2
365
1%
1
μ
F
*C1 IMPROVES RIPPLE REJECTION, X
C
SHOULD BE SMALL COMPARED TO R2
C
L
*
10
μ
F
138A/338A TA03
V
OUT
ADJ
5V
V
IN
+
+
1.2V to 25V Adjustable Regulator
LT338A
V
IN
R1
240
C1*
1
μ
F
NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS
OPTIONAL, IMPROVES TRANSIENT RESPONSE
**
R2
R1
R2
5k
138A/338A TA04
V
OUT
ADJ
V
OUT
V
IN
+
C2**
1
μ
F
*
+
V
OUT
= 1.25V
1 +
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