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LT1991CDD#PBF PDF预览

LT1991CDD#PBF

更新时间: 2024-11-04 13:01:47
品牌 Logo 应用领域
凌特 - Linear 放大器
页数 文件大小 规格书
24页 857K
描述
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LT1991CDD#PBF 数据手册

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LT1999-10/LT1999-20/  
LT1999-50  
High Voltage, Bidirectional  
Current Sense Amplifier  
FeaTures  
DescripTion  
The LT®1999 is a high speed precision current sense  
amplifier, designed to monitor bidirectional currents over  
a wide common mode range. The LT1999 is offered in  
three gain options: 10V/V, 20V/V, and 50V/V.  
n
Buffered Output with 3 Gain Options:  
10V/V, 20V/V, 50V/V  
n
Gain Accuracy: 0.5% Max  
n
Input Common Mode Voltage Range: –5V to 80V  
n
AC CMRR > 80dB at 100kHz  
The LT1999 senses current via an external resistive shunt  
andgeneratesanoutputvoltage,indicatingbothmagnitude  
and direction of the sensed current. The output voltage is  
referencedhalfwaybetweenthesupplyvoltageandground,  
or an external voltage can be used to set the reference  
level. With a 2MHz bandwidth and a common mode input  
range of –5V to 80V, the LT1999 is suitable for monitoring  
currents in H-Bridge motor controls, switching power  
supplies, solenoid currents, and battery charge currents  
from full charge to depletion.  
n
Input Offset Voltage: 1.5mV Max  
n
–3dB Bandwidth: 2MHz  
n
Smooth, Continuous Operation Over Entire Common  
Mode Range  
n
4kV HBM Tolerant and 1kV CDM Tolerant  
n
Low Power Shutdown <10µA  
n
–55°C to 150°C Operating Temperature Range  
n
8-Lead MSOP and 8-Lead SO (Narrow) Packages  
applicaTions  
The LT1999 operates from an independent 5V supply and  
draws1.55mA.Ashutdownmodeisprovidedforminimiz-  
ing power consumption.  
n
n
n
n
n
n
High Side or Low Side Current Sensing  
H-Bridge Motor Control  
Solenoid Current Sense  
The LT1999 is available in an 8-lead MSOP or SOP package.  
High Voltage Data Acquisition  
PWM Control Loops  
Fuse/MOSFET Monitoring  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
Typical applicaTion  
Full Bridge Armature Current Monitor  
+
V
LT1999  
V
S
5V  
+
2µA  
V
1
2
8
7
SHDN  
V
SHDN  
2.5V  
R
+
G
4k  
V
V
+IN  
–IN  
+
R
+
S
V
V
OUT  
REF  
V
0.8k  
0.8k  
+
V
+IN  
V
160k  
160k  
4k  
+
3
4
6
5
5V  
V
0.1µF  
1999 TA01b  
TIME (10µs/DIV)  
0.1µF  
1999 TA01a  
1999fb  
1

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