Built around the HDSC HC32M120 series, this solution uses a sensorless square-wave control strategy with synchronous rectification to deliver high torque and high-speed operation from a BLDC motor. It suits low-voltage, high-power tool applications such as electric drills, angle grinders, impact drills, electric wrenches and rotary hammers.
Key Points
- Sensorless square-wave control with pre-closed-loop high-torque startup
- Up to 48MHz core clock, with over-voltage, under-voltage, over-current and stall protection
- Up to 12,000 rpm (12V / 7 pole-pair BLDC)
Solution Overview
The main controller is an HDSC HC32M120 series MCU, running a sensorless square-wave algorithm and driving the motor through 6-channel PWM.
Recommended MCU
- HDSC HC32M120 series: Arm® Cortex®-M0+ core, cost-effective MCU family; up to 48MHz core clock; 64KB~128KB Flash / 8KB RAM; 12bit ADC, 16bit PWM, analog comparator; LQFP32/QFN48/TQFP48/LQFP64 packages
Core Components
- MCU: HC32M120x (HDSC)
- LDO: MPS, full part number available on request
- MOSFET: Nexperia, full part number available on request
- Comparator: 3Peak, full part number available on request
Functional Block Diagram
