“By design, electric and hybrid vehicles are quieter than traditional models with internal combustion engines—especially when stationary—and drivers are increasingly sensitive to noise created by components like cooling fans,” says Steve Lutz, product line manager for motor controllers at Allegro. “The A89307’s hardware-based algorithm makes it easier for designers to reduce fan noise while improving cooling performance and increasing fuel economy. That’s good for drivers and good for the environment.”
Embedded motion control accelerates sustainability plans.
The A89307 features a hardware-based algorithm that requires no external sensors or software development; the user simply selects parameters via a straightforward graphical user interface and loads them into the integrated circuit's EEPROM chip. With only five external components, the A89307 helps designers reduce material costs by minimizing the number of components in the bill of materials and enabling very small system footprints for motor printed circuit boards. Its fully integrated algorithm can even eliminate the need for a separate microprocessor.
Operating modes include fully programmable open-loop or closed-loop PWM speed control. In closed-loop mode, the customer can program the PWM-speed relationship to match PWM commands provided by an external ECU. Field weakening is included to improve high-speed performance. Low-speed operation and coolant startup are just some of the features included in the A89307 hardware-based digital algorithm.
Although designed for electric vehicle battery cooling fans, the A89307 can also be used in HVAC fans, as well as in liquid pumps for traction inverter cooling systems.
The external door drive allows the device to be flexible enough to operate a wide range of motor power levels up to 500W.
Pricing and Availability
The A89307 is available in a 28L QFN "wettable flank" package.
