60-V sensorless trapezoidal control three-phase BLDC gate driver

The

MCT8329A provides a single-chip, code-free sensorless trapezoidal solution for

applications requiring high speed operation or very fast startup time for three

phase brushless-DC motors. The device provide three half-bridge gate drivers, each

capable of driving high-side and low-side N-channel power MOSFETs. The device

generates correct gate drive voltages using an internal charge pump and enhances the

high-side MOSFETs using a bootstrap circuit. A trickle charge pump is included to

support 100% duty cycle. The gate drive architecture supports peak gate drive

currents up to 1-A source and 2-A sink. The MCT8329A can operate from a single power

supply and supports a wide input supply range of 4.5 to 60 V.

Sensorless trapezoidal control is highly configurable through register settings in

a non-volatile EEPROM (MCT8329A1I) ranging from motor start-up behavior to closed

loop operation, which allows the device to operate stand-alone once it has been

configured. Motor current is sensed using an integrated current sensing amplifier

supporting single external shunt resistor. The device receives a speed command

through a PWM input or analog voltage or variable frequency square wave or

I2C command. There are a large number of protection features

integrated into the MCT8329A, intended to protect the device, motor, and system

against fault events.