LMD18200T: High-Performance H-Bridge Motor Driver from Texas Instruments

The LMD18200T is a high-efficiency, fully integrated H-Bridge motor driver designed by Texas Instruments to control DC and stepper motors in demanding environments. With robust power handling capabilities, integrated protection features, and flexible control inputs, it stands out as an ideal choice for industrial and embedded motor control systems.




Overview of LMD18200T

The LMD18200T is capable of driving motors with a wide supply voltage ranging from 12V to 55V. It can deliver a continuous output current of up to 3A and supports peak currents of up to 6A for short durations. The device includes essential features like thermal shutdown, overcurrent protection, and built-in flyback diodes for safe and reliable operation.

Another key benefit of the LMD18200T is its compatibility with logic-level PWM signals up to 20kHz, enabling precise speed and torque control. Engineers appreciate its ease of integration in both prototype and production systems.




Pin Configuration (TO-220-11 Package)

The LMD18200T comes in a TO-220-11 package and includes essential control and feedback pins:

  • V+: Motor power supply input

  • OUT1 / OUT2: Motor output terminals

  • GND: Ground

  • PWM: Pulse width modulation input

  • DIR: Direction control input

  • BRAKE: Active-high input to stop motor quickly

  • ENABLE: Motor enable signal, active low

  • VSENSE: Outputs voltage proportional to current for sensing

  • DIAG: Diagnostic fault output

  • NC: No connect (not internally bonded)

This layout simplifies both hardware routing and software control in motor-based systems.

Key Features

The LMD18200T integrates everything needed to drive a motor efficiently. Key features include:

  • Wide input voltage range for compatibility with industrial power systems

  • High continuous and peak output currents

  • Built-in current sensing via VSENSE

  • Overtemperature and short-circuit protection

  • Flyback diodes for inductive load protection

  • Simple control via PWM, DIR, and BRAKE inputs

Common Applications

Thanks to its reliability and performance, the LMD18200T is widely used in:

  • Robotics: For driving robot wheels, arms, and manipulators

  • 3D Printers: Smooth control of motors with feedback support

  • CNC Machines: Accurate motion control for industrial tools

  • Automated Guided Vehicles (AGVs): Efficient power conversion in compact designs

  • Educational and DIY Projects: Popular in embedded development and training kits

Whether you're building a prototype or scaling up for mass production, this motor driver provides excellent value and performance.

Advantages Over Other Motor Drivers

Compared to legacy motor drivers like the L298N or modern drivers like DRV8871, the LMD18200T offers a unique balance of higher voltage handling, built-in protection, and more powerful current output. Its thermal stability and ease of use make it a long-standing favorite among engineers.

Frequently Asked Questions

Can the LMD18200T control a stepper motor?
Yes, by using two LMD18200Ts, a bipolar stepper motor can be driven efficiently with independent control over each phase.

Does it support speed control through PWM?
Absolutely. The driver supports high-frequency PWM input, allowing for smooth and precise motor speed control.

Is a heatsink required?
A heatsink is recommended when operating at higher currents to ensure reliable thermal performance.

Can I monitor the motor current?
Yes, the VSENSE pin provides a voltage output proportional to the motor current, which can be used for monitoring and control.

Conclusion

If you're looking for a motor driver that combines power, precision, and protection in a single package, the LMD18200T is a smart choice. It's well-suited for a wide range of applications from industrial automation to robotics and beyond.




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