Smart Gate Driver BLDC Motor Control

The RAA227063 is a smart gate driver IC for 3-phase sensorless brushless DC (BLDC) motor applications. It integrates three half-bridge smart gate drivers that are capable of driving up to three N-Channel MOSFET bridges and supports bridge voltages from 4.5V to 60V, with 1A drive and 2A sinking current capability. It is equipped with an LDO that is fed directly from the input voltage, providing power to the MCU. Three accurate differential amplifiers with adjustable gain are integrated to support ground-side shunt current sensing with the S/H system, which provides results via one output channel to the MCU ADC input.

System Benefits​:

• Proposed solution allows for a minimalistic MCU approach, not requiring 3-phase coupled S/H circuits for shunt current sensing
• Input signal to the PWM consists of the PWM_hi signal only, the PWM_lo with adjustable dead-time is generated by the gate driver
• Wide range of motor capabilities, 5V up to 60V, max 2A

Target Applications:

• Ventilators
• Air-fans
• Heater systems
• Vacuum cleaners

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