ST Launches Plug-and-Play Board to Simplify Power Tool Development
Published2020.10.29 10:17Firmware provided for 6-step motor commutation using Hall effect rotor position detection
Low torque ripple and optimal power efficiency
STMicroelectronics (ST) announced on the 29th the release of two new plug-and-play boards that support the development of cordless power tools. The boards are powered by up to 56V lithium-ion batteries and control three-phase brushless motors.
▲ ST has released the plug-and-play STSPIN32 prototype board, which simplifies the development of cordless power tools. [Photo = ST]
The STEVAL-PTOOL1V1 and STEVAL-PTOOL2V1 evaluation boards are based on the STSPIN32 motor control System-in-Package (SiP), which meets key power tool requirements for small size and low standby current. Firmware for 6-step motor commutation using Hall-effect rotor position detection is provided, ensuring low torque ripple and optimal power efficiency.
The STEVAL-PTOOL1V1 supports equipment powered by lithium-ion battery packs ranging from 2 cells (7.4 V) to 6 cells (22.2 V), measures 70 mm x 30 mm, and provides up to 15 A of continuous current. The standby current is less than 1 µA. At the heart of the board is the STSPIN32F0B motor controller, which contains an STM32F0 microcontroller, three-phase half-bridge gate drivers, 12V and 3.3V voltage regulators, an operational amplifier for current sensing, and power-stage protection features such as programmable over-current protection (OCP), cross-conduction prevention, and under-voltage lockout (UVLO). The STEVAL-PTOOL1V1 power stage features ST’s power MOSFET N-channel 60V STripFET F7 technology.
The STEVAL-PTOOL2V1 board, suitable for battery sizes from 8 cells (29.6 V) to 15 cells (55.5 V), delivers up to 19 A of continuous current. It is controlled by ST’s STSPIN32F0252 motor controller, which includes a 3-phase 250 V gate driver, an STM32F0 microcontroller, and a comparator designed to provide very fast and flexible OCP. The STSPIN32F0252 has a robust design, with its output pins able to withstand below-ground spikes down to -120 V, enhancing the reliability of power tools. The STEVAL-PTOOL2V1 board features onboard bus voltage detection and measures 77 mm x 54 mm. The power stage uses ST’s Power MOSFET N-channel, 80 V, STripFET F7 technology.
Both boards come pre-mounted with heatsinks and feature potentiometers for speed variation, inputs for trigger and direction settings, thermal shutdown, and power stage output reverse bias protection.
Additionally, it can be used in any battery-operated application utilizing a brushless 3-phase motor with single shunt control capability.
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