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Texas Instruments MCF8329A FOC Three-Phase BLDC Gate Driver

Texas Instruments MCF8329A FOC Three-Phase BLDC Gate Driver provides a single-chip, code-free sensorless FOC solution for applications driving brushless-DC motors (BLDC) or Permanent Magnet Synchronous motors (PMSM). The MCF8329A provides three half-bridge gate drivers. Each is capable of driving high-side and low-side N-channel power MOSFETs. The device uses a bootstrap circuit that generates the correct gate drive voltages using an internal charge pump. This feature enhances the high-side MOSFETs. A trickle charge pump is included to support a 100% duty cycle. The MCF8329A supports a wide input supply range of 4.5V to 60V and can operate from a single power supply.

The algorithm configuration can be stored in non-volatile EEPROM, 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 Texas Instruments MCF8329A integrates many protection features to protect the device, system, and motor against fault events.

Features

Three-phase BLDC gate driver with integrated sensorless motor control algorithm
- Code-free single-shunt Field Oriented Control
- Supports up to 1.8kHz (electrical frequency)
- Support flux weakening control
- 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 or current control or modulation index control
- 5-point configurable reference profile support
- Anti-voltage surge prevents overvoltage
- Improved acoustic performance with automatic dead time compensation
- Support maximum torque per ampere (MTPA)
- Offline motor back EMF measurement
- Variable monitoring through DACOUT
65V Three-phase 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
Configurable non-volatile memory (EEPROM) to store device configuration
Supports up to 75kHz PWM frequency for low inductance motor support
Accurate LDO (AVDD) 3.3V ±3%, 50mA support with AVDD connected to VREG
Independent driver shutdown path (DRVOFF)
Spread spectrum for EMI mitigation
A suite of integrated protection features
- Supply under-voltage lockout (UVLO)
- Motor lock detection (3 different types)
- Over-current protection (OCP)
- Thermal shutdown (TSD)
- Fault condition indication pin (nFAULT)
- Optional fault diagnostics over the I²C interface

Applications

Brushless-DC (BLDC) motor modules
Cordless vacuum cleaners
Washer and dishwasher pumps

Appliance fans and pumps
Cordless garden and power tools, lawnmowers

Texas Instruments MCF8329A FOC Three-Phase BLDC Gate Driver

Features

Applications

Simplified Schematic

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