Low-noise fan driver for automotive applications

September 11, 2018 // By Christoph Hammerschmidt
Microelectronics engineering company Melexis (Tessenderlo, Belgium) has developed a single coil fan driver IC that is capable of delivering 600mA at 24V, or 15W and is suitable for a wide range of applications that require high performance with low noise operation. An adaptive control algorithm ensures maximum performance.

The MLX90411 operates from a supply voltage in the range 3V to 28V, making it suitable for all applications that require a supply of 5V, 12V or 24V. In automotive applications, the device can be directly connected to the battery without further protection due to its ability to withstand load dump pulses up to 40V. It is the world’s first ASIL-ready fandriver and can operate over a temperature range of -40°C to +150°C.

Besides applications in the car, the target markets also include home appliances such as air purifiers as well as many white goods. In many of these applications AC induction motors are being replaced by brushless and a single coil fan driver, such as the MLX90411, is the preferred solution.

Multiple commutation options are available, encompassing both low EMI and low acoustic noise. A patent-pending adaptive control algorithm ensures maximum torque and the lowest reverse current across all operating conditions, with any design of motor. Both open loop and closed loop control is possible, with a wide range of dynamic (PI) settings, for a speed range up to 45,000 electrical RPM.

The MLX90411 features multiple integrated protection features including locked rotor, overtemperature, overvoltage, short circuit and current limiting. Not only do these facilitate UL/CE certification, they also meet the most stringent automotive requirements.

The device is programmable via an I2C interface and all options are configurable in the on-board EEPROM. Based upon 0.18μm technology, the tiny MLX90411 is available in a straight-lead SOT package and a 2.5mm x 2.0mm x 0.4mm UTDFN package.

The MLX90411 is sampling now with volumes shipments due later this year.

More information: www.melexis.com


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