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
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Key Product Benefits
STSPIN32F0252 250 V three-phase controller with STM32 MCU
This controller with integrated Cortex-M0 MCU, gate drivers and protection comparator allow significant size reduction and high efficiency for battery-powered applications and allows different control techniques with sensored or sensorless feedback options.
STL130N8F7 N-channel 80 V, 3.0 mΩ typ., 120 A STripFET F7
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.
VIPER01B energy saving off-line high voltage converter
This device offers very low consumption and high feature integration to allow reduced component requirements in final applications and to satisfy stringent energy specifications.
LD1117 adjustable and fixed low-drop positive-voltage regulator
This device features high efficiency and improved drop and tolerance performance.
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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.
