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48V BLDC Motor Position Control

Overview

BLDC motor applications have been increasing rapidly due to the demand for smaller, high-efficiency products. The core of a BLDC motor design is a robust and reliable motor control circuit paired with a versatile MCU for a safe control algorithm. Key components of a motor control circuit include a MOSFET driver, versatile MCU, voltage regulators, cell balancer, and battery charger. This 48V position control system integrates these components to deliver precise and efficient motor control for various industrial applications.

System Benefits:

  • Utilizes an ultra-low power MCU for energy efficiency.
  • Offers a fast wake-up time of 4µs for responsive control.
  • Features an integrated 12-bit ADC with an op amp and comparator.
  • Provides accurate cell balancing and monitoring with customer-programmable EEPROM for customization.

Block Diagram

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4:3 ratioSheet.694Sheet.1Sheet.2Sheet.3Sheet.4US043US043US043Digital Power MonitorDigital Power MonitorDigital Power MonitorSwitching Regulator 1Switching RegulatorSwitching RegulatorGate DriverGate Driver x3Gate Driver x3UART to USB ConverterUART to USB ConverterUART to USB ConverterRS-485 TransceiverRS-485 TransceiverRS-485 TransceiverLevel Shifter 1Level ShifterLevel ShifterMCUMCUMCULevel Shifter 2Level ShifterLevel ShifterCurrent Sense Op AmpCurrent Sense Op AmpCurrent Sense Op AmpLDOLDOLDOSwitching Regulator 2Switching RegulatorSwitching RegulatorHall Sensor/EncoderHall Sensor/EncoderHall Sensor/EncoderReset ICReset ICReset ICAC AdaptorAC AdaptorAC AdaptorMotorSheet.644Sheet.645MMResistor - FixedSheet.652Sheet.653Sheet.654Sheet.655Sheet.656Sheet.657Sheet.658Sheet.659Sheet.660Sheet.661Sheet.662Sheet.663Sheet.664Sheet.665Sheet.666Sheet.667Sheet.668Sheet.669Sheet.670Sheet.671Sheet.672Sheet.673Sheet.674Sheet.675Sheet.676Sheet.677Sheet.678Sheet.679Sheet.680Sheet.681Sheet.682Sheet.683Sheet.684Sheet.685Sheet.686Sheet.687Sheet.693Ground (earth).696Sheet.697Sheet.698Sheet.699Sheet.70048V48V48VConnector 1.171Connector 1.171.703Connector 1.171.704Connector 1.171.706Connector 1.171.707Connector 1.171.7083.3V3.3V3.3VConnector 1.171.710Connector 1.171.711 5V5V5VConnector 1.171.713Sheet.714Ground (earth)Sheet.723Sheet.724Sheet.725Sheet.726Connector 1.171.727Connector 1.171.73012V12V12VConnector 1.171.732 PWMPWMPWMMOSFET x6MOSFET x6MOSFET x6Connector LineConnector Line.737PWM

Digital Power Monitor

Current Sense Amplifiers
Current Sense Amplifiers

Switching Regulator

Buck Controllers (External FETs)
Buck Controllers (External FETs)

Switching Regulator

Buck Regulators (Integrated FETs)

Gate Driver

3-Phase MOSFET Drivers, 3-Phase FET Drivers

Level Shifter

2-Wire Bus Buffers

Level Shifter

2-Wire Bus Buffers

RS-485 Transceiver

RS-485/422 with Enhanced ESD Protection

LDO

Linear Regulators (LDO)

Current Sense Op Amp

General-purpose Op Amps
Application Note

MCU

RA Arm Cortex-M MCUs
RX 32-Bit Performance/Efficiency MCUs

MOSFET

Power MOSFETs

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