A3940KLP

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The A3940KLP is a high-performance integrated stepper motor driver from Allegro MicroSystems that provides an advanced, high-speed microstepping motor control. Classified as a Power Management Interface and Control (PMIC) motor driver, controller, A3940KLP allows users to control the speed, direction, and step resolution of a stepper motor with improved accuracy and performance compared to traditional stepper motor controllers. This device is suited for industrial and automation applications, as well as applications that require precise motion control. This article explains the application fields and working principle of A3940KLP.

Application and Market

The A3940KLP is well-suited for applications that require precise motion control, including precision positioning and closed loop servo andlinear motion stages. With the combination of motion control and power stage, the device is also suitable for many industrial and automation applications, such as medical equipment, consumer electronics, and office automation.

The A3940KLP has a wide range of applications owing to its robust and accurate performance compared to traditional stepper motor controllers. Its accuracy provides superior motion control with no cogging, along with superior load ability, position stability, and low noise compared to traditional controllers. The device also offers a wide range of motion control features, such as microstepping, dual-channel output, and full-step, half-step, and quarter-step resolutions. Additionally, the output current range is adjustable to provide a wide range of current outputs from 1 A to 5 A.

The A3940KLP boasts a wide operating temperature range of -40 °C to 85 °C, making it suitable for use in extreme environmental conditions. It is also designed with safety features that make it suitable for use in safety-critical applications, such as medical and aerospace applications.

Features

The A3940KLP features a wide input voltage range of 4V to 40V, making it suitable for a wide range of applications. It provides an adjustable output current rating of up to 5 A, enabling it to drive small and large motors with ease. Additionally, it is designed with pulse-width modulated (PWM) control and adjustable peak current limit to ensure efficient and optimized operation.

The A3940KLP also offers a wide range of motion control features, such as step and direction signals, as well as full-step, half-step, and quarter-step resolutions. Moreover, the A3940 offers protection features, such as over-temperature protection, over-voltage protection, under-voltage protection, current limit protection, and lock protection.

The A3940KLP is designed with multiple termination options, such as a 6-pin SIP package, a 14-pin SOIC package, and an 8-pin SOIC package. It also offers either a differential output or a TTL compatible logic.

Working Principle

The A3940KLP integrates a pulse-width modulated (PWM) control and a current-sensing circuit to provide an efficient and optimized operation. It provides two channels of full-bridge current control, which can act as either two unique single-channel circuits or a single-channel dual-bridge circuit to drive bi-directional stepper motors.

The output current of the A3940KLP is controlled by a current sensor that is embedded in the device. The device uses step and direction inputs to control the stepper motor. The step/direction pulse is used to generate a PWM signal, which is then used to adjust the output current. Depending on the direction of the pulse, the output current for each channel is either increased or decreased.

The A3940KLP features a wide range of protection features, such as over-temperature protection, over-voltage protection, under-voltage protection, current limit protection, and lock protection. For example, it features an over-temperature protection system that limits the output current of the device if it exceeds the temperature threshold. Additionally, the device features a lock protection system that prevents output current from exceeding the maximum current ratings when the device is in a locked state.

Conclusion

The A3940KLP is a high-performance integrated stepper motor driver from Allegro MicroSystems, which provides an advanced, high-speed and efficient microstepping motor control. It is classified as a Power Management Interface And Control (PMIC) motor driver, controller and is suitable for industrial and automation applications, along with providing superior motion control accuracy with no cogging and superior loadability, position stability and low noise compared to conventional stepper motor controllers. The A3940KLP integrates a pulse-width modulated (PWM) control and a current-sensing circuit to provide an efficient and optimized operation. Additionally, it features multiple protection features, along with a wide range of motion control features and multiple termination options.

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