Datasheet 搜索 > ADI（亚德诺） > LT1638CS8#PBF 数据手册 > LT1638CS8#PBF 数据手册 13/18 页
器件3D模型￥ 28.354
LT1638CS8#PBF 数据手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
封装:
SOIC
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
典型应用电路图在P1P12P13P18
原理图在P11P13
封装尺寸在P3P14P15
焊盘布局在P14P15P16
型号编码规则在P3
标记信息在P3
封装信息在P3
技术参数、封装参数在P7
应用领域在P1P11P12P13
电气规格在P4P5P6P7P8P9P10
导航目录
LT1638CS8#PBF数据手册
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LT1638/LT1639
13
16389fg
SIMPLIF IED SCHEMATIC
TYPICAL APPLICATIONS
–
+
1/2 LT1638
5V
V
+
200Ω
200Ω
0.2Ω
2k
0V TO 4.3V
1638/39 F03
V
OUT
= (2Ω)(I
LOAD
)
Q1
2N3904
LOAD
I
LOAD
Figure 4. Current Source
Figure 3. Positive Supply Rail Current Sense
–
+
1/2 LT1638
R1
1.2V
R1
I
OUT
=
LT1634-1.2
I
OUT
1638/39 F04
V
CC
V
CC
The application in Figure 3 utilizes the Over-The-Top
capabilities of the LT1638. The 0.2Ω resistor senses the
load current while the op amp and NPN transistor form a
closed loop making the collector current of Q1
propor
tional to the load current. As a convenient monitor,
the 2k load resistor converts the current into a voltage. The
positive supply rail, V
+
, is not limited to the 5V supply of
the op amp and could be as high as 44V.
The Figure 4 application uses the LT1638 in conjunction
with the LT1634 micropower shunt reference. The supply
current of the op amp also biases the reference. The drop
across resistor R1 is fi xed at 1.2V generating an output
current equal to 1.2V/R1.
Q10
D5
Q9
Q1
Q7
R2
1k
R3
1k
R4
8k
Q8
Q5
–IN
+IN
Q11 Q12
D4
ONE AMPLIFIER
D2
Q2
D1
Q6
Q13 Q14
R1
6k
R5
8k
Q4
10μA
+
Q15
Q19
D3
Q3
Q16 Q18
Q22
V
+
Q17 Q20
Q21
OUT
V
–
1638/39 SS
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