A3966 Dual Full-Bridge PWM Motor Driver Datasheet

Category: Allegro Microsystems Europe Ltd, Electronics, Other Semiconductors

A3966 Dual Full-Bridge PWM Motor Driver Overview

The A3966 Dual Full-Bridge PWM Motor Driver, designed by Allegro Microsystems, is a state-of-the-art device destined for the precision operation of two-phase bipolar stepper motors. It is particularly notable for its dual full-bridge design that supports continuous output currents up to 1650 mA along with an operating voltage range that can extend to 30 V.

Features and Benefits

Key features of the A3966 include:

High Output Current: With 1650 mA of continuous output current, it caters to a broad range of motion control applications.
Voltage Rating: The driver can support up to 30 V of output voltage, enhancing its ability to drive various motor types.
PWM Current Control: An internal fixed-frequency PWM (pulse-width modulated) current control mechanism allows precise control over motor winding current.
Satlington® Sink Drivers: A patented output structure that offers the benefits of low voltage drop and high peak current capabilities.
Thermal and Overcurrent Protection: Integrates protective measures such as thermal shutdown, crossover-current protection, ground-clamp, and flyback diodes.
Adjustable Blanking Window: Users can select a blanking window to avoid false triggering during switching transitions via an external RC timing network.

Design and Packaging

The A3966 motor driver is supplied in a 16-pin wide SOIC package (suffix LB), notable for its enhanced thermal dissipation enabled by internally fused pins to the die pad. These pins are at ground potential and thus simplify the design by not requiring electrical isolation.

Usability and Protection

This component requires no special power-up sequencing, which makes it easy to integrate into existing designs. Alongside its robust thermal management, other layers of protection include various diodes and shutdown mechanisms to maintain device integrity under adverse conditions. The presence of ENABLE inputs for each bridge facilitates flexible control over the motor driver’s output.

Environmental and Regulatory Compliance

The A3966 promotes environmental responsibility being lead (Pb) free and employing a matte tin leadframe plating.

Selection Guide and Absolute Maximum Ratings

For selection convenience, the A3966 is offered in multiple package quantities with operational ambient temperature ranges from -20°C to 85°C and storage temperature ranges spanning from -55°C to 150°C. Absolute maximum ratings consist of 30 V for the load supply voltage, 7.0 V for the logic supply voltage, and an output current peak of 750 mA. It is crucial to adhere to these specifications to avoid exceeding the device’s capacity and to maintain the temperature within the specified range of up to 150°C for junction temperature.

Company Contact Information

Further details about the A3966, along with other products and services, can be found by contacting Allegro Microsystems at their corporate headquarters located in Worcester, Massachusetts, or by visiting their official website (www.allegromicro.com).