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Elmos driver chip targets 48V vehicle power systems

Posted: 11 May 2015     Print Version  Bookmark and Share

Keywords:Driver chip  brushless DC motor  16bit microcontroller 

German chip manufacturer Elmos unveiled the E523.52 integrated driver chip for brushless DC (BLDC) motors. The driver chip combines a 16bit microcontroller with specific motor control circuitry. Aiming at 48V split-voltage automotive onboard power systems, the E523.52 can also be used in industrial applications at voltages up to 72V.

The device can control up to three n-channel MOSFETs (NMOS) half bridges for BLDC motors in the power range to 1,000W. It has an integrated DC/DC buck converter that generates the voltages for the gate drivers and the supply for the integrated microcontroller. In addition, an internal 3.5V regulator can supply up to 30mA to a microcontroller.

For higher loads, an external transistor may be added. Comprehensive monitoring and diagnosis functions for the MOSFETs ensure reliability and stable operation; the AEC-Q100 certification opens the door to deployment in automotive environments.

E523.52 driver chip

Possible applications include BLDC motor drives as well as general applications within the 48V part of split-voltage supplies in vehicles, 48V telecommunications applications and in general industrial applications at voltages between 24V and 72V. The vendor provides free-of-charge application software for block and sinus wave commutation as well as for space vector modulation. A reference board with power stage and PC-based development environment completes the offer.

A specific feature of the E523.52 is its high design flexibility. The compact QFN36L7 casing requires little installation space, the three half bridges with three high-side and low-side gate drivers each are controlled through a high-voltage input, a digital RUN pin and six digital channels. The six PWM inputs can be configured freely.

Thanks to its internal temperature monitoring and the casing, which has been designed with efficient cooling in mind, the chip can be operated at temperatures between -40°C and 125°C. To output channels provide over and under voltage as well as overheating.

- Christoph Hammerschmidt
  EE Times Europe

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