Small-appliance BLDC motor control MCU has built-in pre-driver

December 01, 2015 // By Graham Prophet
Highly efficient motor control for small appliances is enabled by a tiny microcontroller, says Toshiba Electronics Europe, introducing its TX03 series of ARM Cortex-M3-based microcontrollers now including the TMPM37AFSQG.

The new IC is presented as the smallest vector control microcontroller that incorporates Toshiba?s Vector Engine Plus (VE+) coprocessor and a pre-driver to enable brushless DC motor control. The TMPM37AFSQG pre-driver can directly drive MOSFETs for complementary three-phase PWM output with a minimum unit of 25 nsec. This suits the microcontroller for controlling small motors, server fans, small cooling fans, vent fans, electric fans, ceiling fans, pumps and toys. The microcontroller core is powered from the pre-driver voltage enabling the use of a single-power supply to drive the entire device.

With an ARM Cortex-M3 core capable of running at speeds of up to 40 MHz, a 12-bit A/D converter and an on-board vector control platform, the TMPM37AFSQG enables efficient, low vibration and low noise motor control; also integrated into the device are an op-amp for current detection using a single shunt resistor and a comparator for over-current detection. All functions have been incorporated in a small package (VQFN32 5 x 5 mm, 0.5 mm pitch), designed to minimise mount space.