Design Win

Compact reference design for low voltage brushless power tools up to 36V.

Solution Description

This three-phase brushless motor driver represents a ready-to-use solution for cordless power tool applications supplied by 2S to 6S 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 reliable, high performance operation.

The design is based on the highly integrated STSPIN32F0B System-In-Package capable of driving three-phase brushless motors in various modes. The device embeds 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 supplied by internal LDO internal regulator, a DC/DC buck converter (with external STPS0560Z Schottky rectifier) providing the 3.3 V voltage suitable to supply both the MCU and external components. The integrated operational amplifier ensures signal conditioning, while the comparator with programmable threshold delivers configurable overcurrent protection.

The power stage STL180N6F7 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.

  • Key Product Benefits

    STSPIN32F0B - advanced BLDC controller with STM32 MCU

    This controller integrates an ARM Cortex-M0 MCU with a host of power components to allow much smaller and more efficient power tool and similar battery-powered solutions, as well as the design flexibility to allow different control techniques with sensored or sensorless feedback.

    STL130N8F7 - Power MOSFET in PowerFLAT 5x6 package

    This N-channel Power MOSFET features very low on-state resistance, ensuring an efficient power stage in a small footprint, with good thermal characteristics for potentially hot power tool applications.

    STPS0560Z - power Schottky rectifier

    This Schottky rectifier in tiny SOD-123 package delivers extremely fast switching and negligible switching losses for the 3.3V DC-DC buck converter stage supplying the MCU and external components.

  • All Features

    • Suitable for a wide range of power tools supplied from 2S to 6S batteries (Input voltage from 7 VDC to 45 VDC)
    • Up to 15 A of continuous current delivered
    • Several protection features, including thermal shutdown, undervoltage lockout, and overcurrent protection with programmable threshold
    • 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.