Texas Instruments INA187 High-Precision Current Sense Amplifier

Introduction

The Texas Instruments INA187 is a high-precision, bidirectional current sense amplifier designed for accurate measurement of voltage drops across shunt resistors. With a wide common-mode range and multiple gain options, it is an ideal choice for various high-speed applications.

Part Description

The INA187 operates within a common-mode voltage range of -2V to +42V, independent of the supply voltage. It features a low offset voltage of ±150µV (maximum) and a small gain error of ±0.25% (maximum), ensuring precise current measurement. The amplifier supports bidirectional DC current measurements and is optimized for high-speed applications, boasting a signal bandwidth of 650kHz and a fast settling time of 6.5µs. It operates from a single supply voltage of 2.7V to 12V and is available in three gain options: 20V/V, 50V/V, and 100V/V, making it versatile for various applications.

Applications

• Motor drives
• Solenoids and actuators
• Injection molding machines
• Cordless power tools
• Fast overcurrent protection
• Transient detection

Industries

• Automotive
• Industrial automation
• Consumer electronics
• Robotics
• Renewable energy systems

Usage Ideas

1. Motor Control System: Implement the INA187 in a motor control circuit to monitor and regulate the current flowing to the motor, ensuring efficient operation and preventing overload.
2. Battery Management System: Use the INA187 to measure the current in a battery pack, allowing for accurate state-of-charge calculations and enhancing battery life through effective management.
3. Power Tool Monitoring: Integrate the INA187 into cordless power tools to provide real-time current feedback, enabling features such as overcurrent protection and performance optimization.

Conclusion

The Texas Instruments INA187 High-Precision Current Sense Amplifier is a versatile and reliable component for measuring current in various applications. With its high precision, wide common-mode range, and multiple gain options, it is well-suited for industries ranging from automotive to consumer electronics. Whether for motor control, battery management, or power tool monitoring, the INA187 provides the performance needed for modern electronic designs.