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.
