A3973SB

The A3973SB motor driver is a high-performance bipolar motor driver with advanced protective features for a variety of automotive and industrial applications. Specifically, it is designed to drive brush DC motors with a supply voltage range from 3.2V to 32V and output currents up to 1.2A. It is part of a family of high-performance motor drivers available from STMicroelectronics.

The A3973SB has two integrated bridge drive stages and two integrated H-bridges. The two bridges can be controlled separately or simultaneously. Each bridge is controlled by an independent logic input, which allows two independent motors to be driven on-board with one driver IC. The drive current is controlled by an internal current limiting circuit, which can be externally adjusted.

The A3973SB also has a number of advanced protective features, such as over-temperature protection, under-voltage lockout, short-circuit protection, and over-current protection. The driver also includes a thermal shutdown for protection in the event of overload. Other features include a logic output for indication of over-temperature and over-current conditions.

The A3973SB works by using two bridge drive stages. When the logic input is activated, the bridge drive stages allow current to flow through the H-bridges to drive the motor. The current passing through each bridge is then monitored with a sense resistor in order to provide an adjustable current limiting. The sense resistor is monitored to detect when the current reaches a pre-determined limit. Once the current reaches this limit, the drive is disabled until the motor current has dissipated.

In addition to the bridge drive stages, the A3973SB has a logic output, which provides a signal for over-temperature and over-current conditions. When the logic output is enabled, it provides a logical low output for each bridge, indicating the current limit of the motor has been exceeded. The logic output can be connected to a microcontroller or other external circuitry for monitoring and further protection.

Overall, the A3973SB is a high-performance bipolar motor driver with advanced protective features. It is designed to drive brush DC motors with a supply voltage range from 3.2V to 32V and output currents up to 1.2A. It can be used in a wide range of automotive, industrial, and consumer applications. It provides reliable, efficient operation and reliable, long-term protection in harsh environments.