Design Win

Compact reference design for battery-operated brushless power tools (36V-72V)

Solution Description

This three-phase brushless motor driver represents a ready-to-use solution for heavy-duty cordless power tool applications supplied by higher voltage 8S to 15S battery packs. It frees developers from complex design considerations involving size constraints, heat management, operational and standby efficiency, as well as the control and feedback mechanisms necessary for high performance operation with guaranteed reliability.

The design is based on the highly integrated STSPIN32F0252 System-In-Package capable of driving three-phase brushless motors in various operating modes. The device incorporates an STM32 microcontroller with dedicated firmware ready to run field-oriented control, 6-step sensorless and other advanced driving algorithms, a triple half-bridge gate driver, and a comparator featuring advanced SmartShutDown functionality for rapid overload and overcurrent protection. High-voltage bootstrap diodes are also integrated, as well as anti-cross conduction, deadtime and UVLO protection on both the lower and upper driving sections to prevent the power switches from operating in low efficiency or failure causing conditions.

The power stage STL130N8F7 N-channel power MOSFET ensures very low switching losses, coupled with high current capability and low thermal resistance for highly efficient and reliable motor driving operation in a compact surface mount PowerFLAT 5x6 package. Auxiliary power for the control stage is managed by the VIPER013 high voltage converter in buck configuration in tandem with the LD1117 low drop voltage regulator

  • All Features

    • Suitable for a wide range of power tools supplied from 8S to 15S batteries (Input voltage from 20 VDC to 72 VDC)
    • Up to 19 A of continuous current delivered
    • Several protection features, including thermal shutdown, undervoltage lockout, overcurrent protection with programmable threshold and SmartShutDown function.
    • Full firmware configured for immediate six-step control based on Hall effect sensor feedback, or easily adapted for sensorless control; can be substituted with sensorless / sensored Field Oriented Control algorithms.