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LT1787HV

更新时间： 2024-11-24 22:51:47
品牌 Logo 应用领域
凌特 - Linear 放大器
页数 文件大小 规格书
12页 209K
描述
Precision, High Side Current Sense Amplifiers

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中文翻译

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LT1787HV 数据手册

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LT1787/LT1787HV  
Precision, High Side  
Current Sense Amplifiers  
U
DESCRIPTIO  
FEATURES  
The LT®1787 is a complete micropower precision high  
side current sense amplifier. The LT1787 monitors bidi-  
rectional currents via the voltage across an external sense  
resistor. A current or voltage output depicts the direction  
and magnitude of the sense current. The LT1787 delivers  
greater than a 12-bit dynamic range with ultralow 40µV  
input offset voltage compared to a typical 250mV full-  
scale input voltage. A fixed gain of 8 is set by onboard  
precision resistors. Input signal filtering is easily imple-  
mented with a capacitor between the FIL– and FIL+ pins.  
The LT1787HV operates from 2.5V to 60V total supply  
voltage and the LT1787 operates from 2.5V to 36V total  
supply voltage. Both versions have a PSRR in excess of  
120dB. The LT1787/LT1787HV draw only 60µA and are  
available in 8-lead SO and MSOP packages.  
■
Input Offset Voltage: 75µV (Max)  
■
60V Supply Operation (LT1787HV)  
12-Bit Dynamic Range  
■
■
■
■
■
■
■
Operating Current: 60µA  
User-Selectable External Sense Resistor  
Bidirectional High Side Current Sensing  
Unidirectional or Bidirectional Output  
Input Noise Filtering  
Available in 8-Lead SO and MSOP Packages  
U
APPLICATIO S  
■
Battery Monitoring  
■
Power Monitoring  
■
Portable Phones  
Cellular Phones  
Portable Test/Measurement Systems  
Battery-Operated Systems  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
U
TYPICAL APPLICATIO  
12-Bit Dynamic Resolution Unidirectional Output into LTC®1286 ADC  
Input Offset Voltage vs Supply Voltage  
50  
40  
30  
20  
R
SENSE  
0.0016Ω  
I = 100A  
TO  
LOAD  
2.5V TO 60V  
1
8
–
+
+
FIL  
FIL  
LT1787HV  
–
V
V
S
2
3
S
7
6
R1  
15k  
10  
C1  
5V  
1µF  
V
R
BIAS  
0
–10  
–20  
DNC  
OUT  
20k  
V
V
CC  
REF  
4
5
CS  
CLK  
V
+IN  
EE  
LTC1286  
TO µP  
V
OUT  
–30  
–40  
–50  
–IN  
D
OUT  
GND  
C2  
0.1µF  
1787 TA01  
LT1634-1.25  
V
= V  
+ (8 • I  
• R  
)
SENSE  
OUT  
BIAS  
LOAD  
0
10  
30  
40  
50  
60  
20  
TOTAL SUPPLY VOLTAGE (V)  
1787 TA01b  
1
1234567...12

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