LMD18200T is an integrated circuit chip produced by Texas Instruments, mainly used as Motor Driver or Current Amplifier. It is designed to control and drive DC motors and other high current loads.

The LMD18200T is an H-bridge assembly dedicated to DC motor drives. The CMIOS control circuit and DMOS power device are integrated on the same chip, which can be used to form a complete motion control system with the main processor, motor and incremental encoder.

 

 

Ⅰ.Characteristics of LMD18200T

•LMD18200T can be used as a current amplifier to amplify the input current signal and used as a motor driver to control the operation of the DC motor
•Delivers Up to 3A Continuous Output
•Operates at Supply Voltages Up to 55V
•Used to support high current loads and typically have a higher output current capability, making them suitable for applications requiring high power
•TTL and CMOS Compatible Inputs
•LMD18200T can work in a wide voltage range to suit different supply voltage requirements
•Thermal Warning Flag Output at 145°C
•Thermal Shutdown (Outputs Off) at 170°C
•A pulse width modulation (PWM) signal is typically used to control the speed and direction of the motor, enabling precise motor control.
•Chips typically have internal current sensing circuitry that can be used to monitor output current and implement overcurrent protection
•LMD18200T Internal Clamp Diodes
•LMD18200T Shorted Load Protection
•LMD18200T usually has an over-temperature protection feature to prevent the chip from overheating and damage
•Internal Charge Pump with External Bootstrap Capability

Ⅱ.Relevant data of LMD18200T

•Current-Output:3A
•Voltage-power supply:12V~ 55V
•Voltage-load: 12V~55V
•Mounting type:Through hole
•Pd-Power dissipation: 25 W
•Subcategory: PMIC-Power Management ICs
•Minimum operating temperature:- 40 C
•Maximum operating temperature: +125 C
•Number of output ports:2 Output

 

Ⅲ.Package type of LMD18200T

The LMD18200T is generally available in the following two package types:
1.TO-220 package: TO-220 (also known as TO-220AB) is a common plug-in package, usually with three pins. This package is typically used in high power applications where heat dissipation is required. The pins of the TO-220 package are easy to connect to the board, and a heat sink can be attached to cool the chip.
2.HZIP-15 package: HZIP-15 (also known as TO-99-15) is a multi-pin package that is often used to provide more features and connection options. It has more pins and thus can support more complex circuit configurations.

Ⅳ.Application fields of LMD18200T

As an integrated circuit chip for motor drivers and current amplifiers, the LMD18200T has a wide range of applications, especially those that require controlling motors and currents.
1.Automotive and vehicle applications:The LMD18200T can be used for motor control in systems such as automotive power windows, seat adjusters, fans, and power mirrors.
2.Robotics:The LMD18200T can be used to control the motors of the robot joints, enabling the robot to achieve precise movement and positioning.
3.Printers and scanners: Motors in printers and scanners often require precise speed and position control, and the LMD18200T can achieve these controls.
4.Industrial automation:Industrial machinery and automation equipment often use motors to perform various tasks, and the LMD18200T can be used to control these motors.
5.Electric tools: Electric tools, such as electric drills and saw blocks, usually use motors as power sources, and the LMD18200T can be used to control their operation.
6.Household appliances: Some household appliances, such as washing machines, fans, and mixers, use motors as driving forces, and the LMD18200T can be used to control them.
7.Medical equipment:In some medical equipment, motors need to be controlled to perform precise movements, such as surgical robots and drug delivery systems.
8.Electric models and toys:Motors are commonly used in drones, remote control vehicles and other electric models and toys, and the LMD18200T can be used to control their power.

Ⅴ. Which models have functions similar to LMD18200T?

1.L298N: L298N is another common motor driver chip, usually used for dual-channel motor control. It can be used for speed and direction control of DC motors, with over-current and over-temperature protection functions.
2.DRV8833: DRV8833 is a dual-channel H-bridge motor driver produced by Texas Instruments. It is suitable for low voltage and low power applications with PWM control and protection features.
3.L293D:The L293D is another dual-channel motor driver suitable for the control of DC motors. It also has over-current protection and is widely used in small electric robots and toys.
4.L298:L298 is the predecessor of L298N, and it is also a dual-channel motor driver, which is widely used in various electric equipment.
5.L6203:L6203 is a dual-channel H-bridge motor driver manufactured by STMicroelectronics for high-power motor applications with over-current and over-temperature protection.

Ⅵ.Absolute Maximum Ratings for LMD18200T

 

(1)Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions.

(2)If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and specifications.

(3)See Application Information for details regarding current limiting.

(4)The maximum power dissipation must be derated at elevated temperatures and is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any temperature is PD(max) = (TJ(max) − TA) /θJA, or the number given in the Absolute Ratings, whichever is lower. The typical thermal resistance from junction to case (θJC) is 1.0°C/W and from junction to ambient (θJA) is 30°C/W. For ensured operation TJ(max) = 125°C.

(5)Human-body model,100 pF discharged through a 1.5 kΩ resistor. Except Bootstrap pins (pins 1 and 11) which are protected to 1000V of ESD.

Ⅶ.Working principle of LMD18200T

H-bridge circuit:The LMD18200T contains an H-bridge circuit internally, consisting of four switching elements, usually power transistors or MOSFETs. The four switching elements can be divided into two pairs, with each pair located between two poles of the motor.

Direction Control:The LMD18200T usually has an additional input for controlling the direction of the motor. By connecting this input to a different level (high or low), you can change the direction of the motor, making it run forward or reverse.

Control Input:The LMD18200T operates the switching element via a control input signal. Typically, it accepts PWM signals from a microcontroller or other controller to control the speed of the motor. By changing the duty cycle of the PWM signal, you can adjust the speed of the motor.

Current Control:The LMD18200T has built-in current feedback and limiting to prevent excessive current. It monitors the motor's current and limits the current by reducing the on-time of the switching element when the current reaches a preset threshold. This helps protect the motor and circuitry from damage due to overcurrent.

Protection features:This chip also usually includes protection features such as overheating protection and overcurrent protection to ensure safe operation of the circuit.

 

 

Frequently Asked Questions

1.How to use LMD18200T safely and effectively?
Use an appropriate power module or power circuit to provide the voltage and current required by the LMD18200T. If the application requires it, consider using a heat sink to cool the LMD18200T, especially in high power applications. Overheating can damage the chip. Understand the overcurrent protection features of the LMD18200T and ensure that other components and motors in the circuit can operate within a safe range. Use capacitors on the power lines to filter the power supply to ensure stable supply voltage and reduce power supply noise.

2.How to configure the LMD18200T to drive a DC motor?
Connect the two terminals of the DC motor to the OUT1 and OUT2 pins of the LMD18200T. These pins correspond to the positive and negative poles of the motor. Connect the appropriate supply voltage and current to the VCC and GND pins of the LMD18200T. Please make sure the power supply voltage is within the specifications of the chip. Use an external control circuit, typically a PWM signal from a microcontroller or other controller, connected to the Enable pin of the LMD18200T. By changing the duty cycle of the PWM signal, the speed of the motor can be controlled. In some applications, the Enable pin can also be used as an enable/disable input.

3.How to connect and use LMD18200T as current amplifier?
Connecting the power supply, connecting the power supply, current amplification setting, current output, power supply filtering, heat sink, testing and debugging, safety.