Allegro MicroSystems, designed specifically for battery cooling fans and HVAC systems in EVs and HEVs, extends its QuietMotion product line with the new A89307 vehicle-level gate driver IC. To help automakers reduce noise and extend battery life, provide more range charging and reduce a vehicle's carbon footprint. Provides ultra-low noise and vibration by using FOC algorithms to drive continuous sinusoidal current to the load.
"Electric and hybrid vehicles are designed to be quieter than conventional models with internal combustion engines -- especially when they stop -- and drivers are increasingly sensitive to noise generated by components such as cooling fans," said Steve Lutz, product line director at The company. Allegro's motor driver. "The A89307's hardware-based algorithms enable designers to more easily reduce fan noise while improving cooling performance and increasing mileage per charge. It's good for drivers and good for the environment."
The user simply selects parameters using a simple GUI and loads them into the IC's on-chip EEPROM. Because the device contains hardware-based algorithms, there is no need for external sensors or software development; Its fully integrated algorithm eliminates even the need for a separate microprocessor. With five external components, it helps designers reduce material costs by reducing BOM components and helping designers reduce the system footprint of the PCB inside the motor.
Operating modes include open-loop PWM or fully programmable closed-loop speed control. In closed loop mode, the user can program the PWM- speed relationship to match PWM commands from the external ECU. The magnetic field is weakened for better performance at high speeds. Low speed operation and windmill startup are just a few characteristics of hardware-based digital algorithms.
The unit is designed for use with xEV battery cooling fans and can also be used with hVAC blowers and fluid pumps in traction inverter cooling systems. The external gate drive allows the device to be flexible enough to drive a wide range of motor power up to 500W. The device is available in a 28L wettable side QFN package.
