A3955SB-T

Step Resolution:	1, 1/2, 1/4, 1/8
Base Part Number:	A3955
Supplier Device Package:	16-DIP
Package / Case:	16-PowerDIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-20°C ~ 150°C (TJ)
Voltage - Load:	4.5 V ~ 50 V
Voltage - Supply:	4.5 V ~ 5.5 V
Current - Output:	1.5A
Applications:	General Purpose
Series:	--
Technology:	Bipolar
Interface:	Parallel
Output Configuration:	Half Bridge (2)
Function:	Driver - Fully Integrated, Control and Power Stage
Motor Type - AC, DC:	--
Motor Type - Stepper:	Bipolar
Part Status:	Obsolete
Packaging:	Tube

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PMIC - Motor Drivers, ControllersA3955SB-T is a monolithic bipolar step non-commercial motor driver developed by Allegro Microsystems. It is employed in numerous industrial, consumer, and commercial applications. This device can be used to control brushed DC motors (intended for “unrestricted” 5-30 Volt applications) up to 400 Watts. It has integrated protection features, is fitted with advanced on-chip diagnostics and a thermal shutdown circuit. It also has full bridge and dual half-bridges driving capabilities.The core of this powerful motor driver lies in its basic working principle. Its design enables a wide variety of motor control capabilities. The A3955SB-T utilizes its powerful micro-stepping technology which is used to achieve smooth and accurate position control of a motor within a wide speed range. It specifically uses the “micro-stepping” mode in order to more precisely control the motor position through the use of long pulse train commands that are generated by a controller. In short, the A3955SB-T converts digital command signals into a stream of small, discrete pulses that are used to control the speed and position of the motor.By taking advantage of the A3955SB-T’s advanced features, its users benefit from an improved overall performance and better control of the motor operation. For example, its advanced current-sensing circuit monitors and regulates the motor’s current output, thus reducing the total power consumption. Also, the A3955SB-T evaluates the electrical load for each phase and modifies the drive frequencies to optimize its performance.This device can handle a wide range of applications that include motor control systems, motor speed control, as well as other industrial, consumer, and automotive applications. The device can be used to manually control the speed and position of linear motors as well as of positioners and actuators. The A3955SB-T provides an alternative and cost-effective solution to mechanically controlling the position of a motor in series or linear applications.The A3955SB-T is featured with an integrated protective circuit that guards the device from operating in excess of its ratings. Moreover, the device utilizes an embedded thermal shutdown circuitry which shuts down the motor conveniently if it is placed at a temperature range beyond its rating (beyond 80°C).The A3955SB-T is available in a 20-pin TSSOP-EP package and is equipped with integrated position sensors, which “learn” and track the motor position relative to its peak magnetic field. The integrated micro-stepping technology and advanced features of the device allow it to maintain precise and precise control of the motor position, even at speeds up to 400 Watts. Its advanced micro-stepping technology also allow users to more finely control the motor position, making it suitable for use in applications which require precise and accurate positioning. Furthermore, its current sensing circuit ensures that power consumption is kept low, resulting in extended product life-cycles and cost savings.In conclusion, the A3955SB-T is an optimal solution for a range of industrial, consumer, and commercial motor control applications. Its reliable and advanced characteristics, integrated protection circuit, current sensing, and integrated position sensors, makes this device widely used, convenient and beneficial for users.

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