Motor driver platform addresses highly integrated mechatronic designs

November 28, 2014 // By Christoph Hammerschmidt
Addressing car manufacturers' and tier one's strategy towards electrification of auxiliary components in vehicles, Infineon has launched an intelligent motor driver chip platform with embedded 32-bit ARM Cortex M3 processors inside. The first two family members are the TLE987x series for 3-phase (brushless DC) motors and the TLE986x series for 2phase (DC) motors.

In this product family, Infineon combined its proprietary automotive qualified 130nm Smart Power manufacturing technology with its experience in motor control drivers. "Our strategy is bringing the intelligence next to the motors in mechatronic designs", said Theodore Varelas, Marketing Manager, Automotive Body Power Applications at Infineon.

Where previous multi-chip designs needed a standalone microcontroller, a bridge driver and a LIN bus transceiver, users of the new chip family benefit from motor control designs with minimum external components count. The products reduce the component count from today's approximately more than 150 down to less than 30, thus allowing integration of all functions and associated external components for the motor control in a PCB area of merely 3cm².

The peripheral set of both the the TLE987x and the TLE986x includes a current sensor, a successive approximation 10-bit ADC synchronized with the capture and compare unit for PWM control and 16-bit timers. Both series include an on-chip linear voltage regulator to supply external loads. Their flash memory is scalable from 36kB to 128kB. They operate from 5.4V up to 28V. An integrated charge pump enables low voltage operation using only two external capacitors, resulting in a significant BoM reduction when compared with the commonly used voltage bootstrap techniques. The bridge drivers feature programmable charging and discharging current. The patented current slope control technique optimizes the system EMC behaviour for a wide range of MOSFETs. The products withstand load dump conditions up to 40V while maintaining an extended supply voltage operating down to 3.0V where the microcontroller and the flash memory are fully functional.

The TLE987x series of bridge drivers addresses 3-phase (BLDC) motor applications such as fuel pumps, HVAC blowers, engine cooling fans, water pumps as well as other pumps and fans. It supports sensor-less and sensor based BLDC motor applications, including field-oriented control, addressed by LIN or controlled via PWM.

The TLE987x series includes six fully integrated NFET drivers optimized to drive