STMicroelectronics has released a reference board, the ELDRIVE101-HPD, which combines an STDrive101 three-phase, triple half-bridge gate driver with an Arm Cortex M0+ STM32G071KB microcontroller. ST designed the board to drive 750 W brushless DC motors (BLDCs). The design uses six STL220N6F7 60-V STripFET F7 MOSFETs to drive BLDC motors from 18 V to 52 V at up to 15 A. The N-channel MOSFETs have a low RDS, at 1.2 mΩ, and the entire system has a sleep mode power draw of less than 1 uA.



Brushless DC motor are electrically and audibly quieter than their brushed companions. They feature longer service lives and more reliable speed control. Their primary disadvantage is that they require electronic control. While a brushed motor requires little more than a DC power source and a switch, BLDCs require complex drive circuitry. The new reference design from ST removes much of the complexity by offering a complete circuit in a size and configuration that is ready to use out of the box.

At 50 mm (less than 2”) in diameter, the motor drive board can fit into many form factors that were previously out of reach for high-powered BLDC motors. It is designed for small battery-powered devices like hair dryers, power tools, and fans. Its small size and high power also make it useful for household robots and personal drones. Outside the home, it enables more compact industrial equipment such as pumps and process automation equipment.

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