LB1897D-E

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Driving motors of controlling the motion of machinery and devices is of utmost importance in areas such as automated machinery, robotics, and automotive control. The LB1897D-E is a multi-phased motor driver controller especially suited for such applications that integrates several features to facilitate the development of motor driver designs. This device includes a number of features, such as adjustable current limitation, fixed period PWM generation, over-current and thermal protection, and high-frequency operation, making it an invaluable tool for motor control applications.

Overview

The LB1897D-E is a BiCMOS power integrated circuit (IC). It is a low-voltage applied motor driver with a single supply voltage ranging from 3 to 8 V. It includes a built-in MOSFET output stage, as well as a five-phase current limit circuit to maintain the current level at a constant value. The circuit off-time is also adjustable using a current limiting resistor.

The LB1897D-E contains integral protection functions that support the application circuit\'s stability and reliability, such as high-temperature protection from excessive power dissipation, over-current and over-voltage protection, and efficient thermal shut-off. Furthermore, the device is built to operate at high frequency, up to 3 MHz.

Features and Benefits

The LB1897D-E is a power IC featuring high-efficiency motor driving and protection functions that are essential in the development of motor control applications. Among its features are:

• Wide Supply Voltage and Output Current Range: The device will facilitate a range of supply voltages from 3-8 V, while maintaining a minimum output current range of 20 mA.
• Adjustable Driving Circuit: The device can be tailored to the specific application needs by providing an adjustable fan-out of 1-4 series and an adjustable current limit of 0.3-2 A.
• High-frequency Operation: The device operates up to 3MHz, providing high performance in a wide range of control applications.
• Protection Functions: The device offers protection from over-heating, over-current, and over-voltage, enabling a more robust system.
• Low power consumption: The device requires minimum current consumption and hence minimises the overall power consumption.

Applications

The LB1897D-E integrated motor driving and protection features makes it suitable for use in a variety of motor control applications. Some of the main areas of application are:

• Automotive Motor Control: The LB1897D-E can be used to control electric motors used in various automotive systems including throttle control, electric cooling fans, and engine control.
• Robotics: The device provides an ideal solution to control robotic arms, grippers, and other mechatronic systems.
• Industrial Machinery: The device provides a robust solution for the development of motor control systems for industrial machinery like conveyor belts, pumps and compressors.
• Applications: The device is suitable for a variety of applications such as motor control for small appliances, home automation systems, and medical instrumentation.

Working Principle

The LB1897D-E works by sensing the voltage between two ends of the motor\'s two output terminals. This voltage is compared to a set reference level. If the difference is greater than a certain amount, the device will start a time-dependent process, to automatically increase its output current, until the voltage level is equal to the reference level. The device also supports a regenerative braking feature, whereby when the motor switches direction, it will deliver a high-frequency signal to shut off the power to the motor.

The LB1897D-E allows for the adjustment of the current limit and the fan-out by adjusting external devices, enabling the circuit to be customized to the specific application. It also includes a number of protection features, such as over-current and over-voltage protection, as well as thermal shut-off which further increases the system stability.

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