STMicroelectronics STSPIN32G4 | Demoboard AN5748

Description

The STSPIN32G4 is an advanced controller for driving three-phase brushless motors that integrates a triple half-bridge gate driver, one high performance STM32G431 microcontroller and a flexible power management circuitry. In particular, one Buckconverter is available to efficiently generate gate driver supply voltage, VCC, starting from motor supply VM. When VM voltage is reduced approaching target VCC voltage, the Buck converter is not able to properly regulate its output voltage that is consequently lower than input supply level. A reduction of system performance could arise during these low supply voltage operations since power MOSFETs of the motor inverter might be turned on with a not optimal gate voltage providing increased channel resistance and power losses.This application note describes how to convert the Buck regulator integrated inside STSPIN32G4 into a Buck-Boost regulator with few external components.The presented solution can be beneficial for battery powered applications to achieve best system efficiency

Features

• Motor supply voltage from 5.5 V to 75 V
• Three-phase gate drivers:
• 1 A sink/source current capability
• VDS monitoring of the power stage MOSFETs
• Integrated bootstrap diodes
• I2C accessible configuration and status registers for best application fit
• Cross-conduction prevention
• STM32G431 microcontroller with 32-bit ARM® Cortex®-M4 MCU+FPU core:
• Up to 170 MHz clock frequency
• CORDIC mathematical hardware accelerator for trigonometric functions
• 128 kB Flash memory with proprietary code readout protection (PCROP), securable memory area, 1 kB OTP
• 32 kB SRAM memory with HW parity check
• 2 x advanced times for motor control, 16-bit with up to 6 x PWM channels
• 8 x general purpose timers
• 2 x ADCs 12-bit resolution (up to 19 channels) with 4 Msps conversion rate
• 4 x 12-bit DAC channels
• 4 x ultra-fast rail-to-rail comparators
• 3 x rail-to-rail operational amplifiers usable also in PGA mode
• Internal high precision voltage reference
• Up to 40 GPIOs
• Full set of interfaces: I2C, SPI, UART and CAN
• Self-supplied thanks to embedded flexible power management
• VCC buck converter up to 200 mA, with programmable output and embedded MOSFET
• 3.3 V LDO linear regulator up to 150 mA
• Low quiescent linear regulator for MCU supply during standby
• Full set of protection features: thermal shutdown, short-circuit, overload and UVLO
• Possibility to control 2 motors simultaneously from the same MCU
• Standby mode for reduced power consumption
• On-chip debug support via SWD or JTAG
• Extended temperature range: -40 to +125°C

Typical applications

• 3-phase brushless motor controller

More information

• Datasheet
• IC product information