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Second-gen brushless DC motor controller debuts

Posted: 24 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:sensorless brushless controller? motor controller DC? automotive application?

Melexis Microelectronic Integrated Systems N.V. has launched its first member of the second generation of integrated brushless DC motor controllers. The MLX81200 sports TruSense and SineDrive technologies, which enable designers to integrate applications of this motor type in automotive applications.

According to Melexis, TrueSense technologies combine reluctance measurement with BEMF (Back Electromotive Force) sensing for detection and tracking of the rotor position, allowing a robust motor operation in a wide dynamic range in harsh environments. This Melexis second-generation sensorless brushless DC motor controllers feature dedicated hardware blocks and patented motor control algorithms to guarantee fail safe and robust sensorless operation under stringent automotive conditions. On the fly, rotor position sensing allows fast startup to nominal speed within 70ms. The patented BEMF sensing using a phase integrator enables operation from ultra low to high motor speeds under fast varying load conditions.

The SineDrive motor control allows shaping the motor current to optimize efficiency and torque ripple for each motor, especially important for applications like engine cooling fans and HVAC blowers. Furthermore, sensorless Sinewave motor control also reduces audible noise, conducted and radiated emissions simplifying the motor control. The MLX81200 enables new applications in the world of sensorless brushless DC motors. The reliable and wide dynamic operating range, the very low speed operation capabilities (reducing battery drain during engine stop condition) and the high integration make the MLX81200 a suitable solution for water pumps and transmission oil pumps in hybrid powertrains. Additionally, brushless DC fuel pumps, active suspension control, engine cooling fans and HVAC blowers benefit when using the new Melexis device.

The MLX81200 combines a 16bit microcontroller with a high voltage analog periphery for brushless DC motor control allowing smallest application PCBs with only a few external discrete components. It includes 30Kbyte flash program memory, 2Kbyte SRAM, 128byte data EEPROM, voltage regulator, on-chip RC oscillator, pre-driver for directly driving 6 n-channel power FETs, highly accurate shunt current sensing, independent analog watch dog, high voltage I/Os and several diagnostic functions for a fail/safe operation., It is available in QFN48 and TQFP48 7mm x 7mm packages, and has been qualified up to 150C ambient temperature, making it an ideal fit for under the hood applications.

- Christoph Hammerschmidt
Automotive Design Europe

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