Smart LIN motor pre-driver assists high power mechatronic miniaturization

Smart LIN motor pre-driver assists high power mechatronic miniaturization

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By Christoph Hammerschmidt

The MLX81346 enables motor control miniaturization and efficient silent drive with field-oriented control (FOC). It addresses automotive mechatronic applications – including oil pumps, engine cooling fans, and BLDC positioning actuators. The device is also used in robotic systems and e-bikes/e-scooters.

As well as being able to support operation up to 1000 W from a 12 V supply, the MLX81346 is also uniquely positioned to reach 2000 W from a 48 V supply. Its high-voltage capabilities come from the silicon-on-insulator (SOI) technology it relies on.

The MLX81346 features a 16-bit embedded microcontroller unit (MCU), a 64 KB flash memory, plus a LIN software stack and LIN interface (for connecting to in-vehicle networking infrastructure). It has 12 GPIOs including 3x high-voltage I/Os, 2 UARTs, SPI and I2C. Rapid end-of-line programming via the LIN pin can be carried out by the customers with the support of Melexis’ recommended third parties.

This compact pre-driver chip can be supplied in either a 32-pin QFN (5 mm x 5 mm) or a 48-pin TQFP48 (7 mm x 7 mm) packages. The device was developed as a SEooC (Safety Element out of Context) with ASIL B capability. An operational temperature range of -40°C to 150°C is supported. All essential circuit protection functions are also incorporated.

“The MLX8146 completes our third generation of embedded drivers. The family now includes the LIN drivers MLX81330 and MLX81332 for 1 to 10 W applications, and the LIN pre-drivers MLX81340, MLX81344 and MLX81346 for 10..2000 W applications,” says Marc Lambrechts, Product Line Manager for Embedded Motor Drivers. “With the MLX81346, Melexis is the first company to bring a fully integrated 48 V pre-driver System-on-Chip (SoC) to the market.”

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