Advanced Motor Control and Thermal Management Enhance e-Mobility and Automation
Three new solutions developed by Allegro MicroSystems are designed to enhance motor-control and thermal-management performance in e-mobility and industrial automation applications:
A89347 Fan Driver IC
Allegro’s A89347 is an automotive-grade, sensorless sinusoidal three-phase BLDC driver for electric-vehicle (EV) seat- and battery-cooling fans. It offers integrated closed-loop speed control to minimize vibration and audible noise. In addition, a customizable speed curve, configured via EEPROM, allows for tailored performance in various fan applications.
The A89347 features slew-rate control, lock detection, and a low-power standby mode with a current consumption of just 10 µA. Flexible control contributes to quieter, more efficient fan operation, while lower power consumption extends battery life. This AEC-Q100-qualified IC helps ensure reliable operation in automotive environments.
ACS37035 Current Sensor
The ACS37035 high-accuracy current sensor boasts a 1-MHz bandwidth and 0.45-µs typical response time, enabling precise measurement of high-frequency currents in fast control loops. Its differential sensing capability, combined with a common-mode rejection ratio (CMRR) of 4 mA/Gauss, provides high immunity to external magnetic fields, ensuring accurate measurements even in noisy environments.
With a ±3% sensitivity error over temperature and a maximum offset voltage of ±15 mV, the sensor minimizes error and improves system performance. Target applications include motor control, load detection and management, and switch-mode power supplies.
ACS37630 Current Sensor
Designed for U-core current-sensing applications like xEV traction inverter and battery-management systems, the ACS37630 offers high bandwidth (up to 250 kHz) and a fast analog output with a 1.6-µs typical response time. Its vertical Hall technology enables sensing parallel to the package surface, suiting it for system integration with U-core magnets. This contactless, non-invasive current-sensing solution eliminates the need for C-core magnets, simplifying assembly and reducing system complexity.
With a sensitivity of ±0.7% and offset of ±5 mV, the ACS37630 provides precise current measurements over the full automotive Grade 0 operating temperature range of –50 to +150°C. A simplified design and high accuracy reduce current-sensing system design and manufacturing complexity while lowering costs and improving system reliability.
All devices will include evaluation boards and comprehensive support resources to assist customers with design and development.
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Lee Goldberg
Contributing Editor
Lee Goldberg is a self-identified “Recovering Engineer,” Maker/Hacker, Green-Tech Maven, Aviator, Gadfly, and Geek Dad. He spent the first 18 years of his career helping design microprocessors, embedded systems, renewable energy applications, and the occasional interplanetary spacecraft. After trading his ‘scope and soldering iron for a keyboard and a second career as a tech journalist, he’s spent the next two decades at several print and online engineering publications.
Lee’s current focus is power electronics, especially the technologies involved with energy efficiency, energy management, and renewable energy. This dovetails with his coverage of sustainable technologies and various environmental and social issues within the engineering community that he began in 1996. Lee also covers 3D printers, open-source hardware, and other Maker/Hacker technologies.
Lee holds a BSEE in Electrical Engineering from Thomas Edison College, and participated in a colloquium on technology, society, and the environment at Goddard College’s Institute for Social Ecology. His book, “Green Electronics/Green Bottom Line - A Commonsense Guide To Environmentally Responsible Engineering and Management,” was published by Newnes Press.
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