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Texas Instruments MCT8329A Three-Phase BLDC Gate Driver

Texas Instruments MCT8329A Three-Phase BLDC Gate Driver provides a single-chip, code-free sensorless trapezoidal solution for applications requiring high-speed operation or very fast startup time. The device offers 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 a 100% duty cycle. The gate drive architecture supports peak gate drive currents up to 1A source and 2A sink. The MCT8329A can operate from a single power supply and supports a wide input supply range of 4.5V to 60V.

Sensorless trapezoidal control is highly configurable through register settings in a non-volatile EEPROM (MCT8329A1I), ranging from motor startup 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 a single external shunt resistor. The device receives a speed command through a PWM input, analog voltage, variable frequency square wave, or I²C command. Many protection features are integrated into the Texas Instruments MCT8329A to protect the device, motor, and system against fault events.

Features

Three-phase BLDC gate driver with integrated sensorless motor control algorithm
- Code-free high-speed Trapezoidal Control
- Supports up to 3kHz (electrical frequency)
- Very fast startup time (< 50ms)
- Fast deceleration (< 150ms)
- Supports 120° or 150° modulation to improve acoustic performance
- Forward and reverse windmilling support
- Analog, PWM, freq., or I²C-based control input
- Configurable motor startup and stop options
- Optional closed-loop speed or power control, open-loop voltage control
- 5-point configurable reference profile support
- Anti-voltage surge prevents overvoltage
- Variable monitoring through DACOUT
65V three-phase half-bridge gate driver
- Drives three high-side and three low-side N-Channel MOSFETs, 4.5V to 60V operating voltage
- Supports 100% PWM duty cycle
- Bootstrap-based gate driver architecture
- 1A/2A maximum peak source/sink current

Integrated current sense amplifier
- Adjustable gain (5V/V, 10V/V, 20V/V, 40V/V)
Low-power sleep mode
- 5µA (maximum) at V_PVDD = 24V, T_A = 25°C
Speed loop accuracy of < 3% with internal clock
Supports up to 100kHz PWM frequency
Accurate LDO (AVDD) 3.3V ±3%, 50mA support with AVDD connected to VREG
Independent driver shutdown path (DRVOFF)
Spread spectrum for EMI mitigation
Suite of Integrated protection features
- Supply undervoltage lockout (UVLO)
- Motor lock detection (3 different types)
- Overcurrent protection (OCP)
- Thermal shutdown (TSD)
- Fault condition indication pin (nFAULT)
- Optional fault diagnostics over the I²C interface

Applications

Brushless-DC (BLDC) motor modules LDO out
Cordless vacuum cleaners PWM, analog, frequency, or commanded over I²C

HVAC blowers and ventilators
Appliance fans and pumps
Cordless garden and power tools, lawnmowers

Texas Instruments MCT8329A Three-Phase BLDC Gate Driver

Features

Applications

Simplified Schematic

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