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Texas Instruments MCT8314Z BLDC Motor Driver

Texas Instruments MCT8314Z Brushless DC (BLDC) Motor Driver provides a single-chip and code-free sensored trapezoidal commutation device for driving 12V to 24V BLDC motors. This motor driver integrates three 1/2-H bridges with 40V absolute maximum capability and a 575mΩ low RDS(ON) to enable high-power drive capability. The MCT8314Z motor driver implements sensor-based trapezoidal control in a fixed-function state machine and eliminates the need for the external microcontroller to spin the BLDC motor.

The MCT8314Z three-phase motor driver includes protection functions to protect the motor, device, and system from fault events. This motor driver supports up to 100kHz Pulse Width Modulation (PWM) frequency and 1.8V, 3.3V and 5V logic inputs. The MCT8314Z motor driver operates within the 5V to 35V voltage range and -40°C to 125°C ambient temperature range. This motor driver is used in HVAC motors, small home appliances, office automation appliances, and robotics.

Features

  • Three-phase BLDC motor driver with integrated sensored trapezoidal control:
    • Hall sensor based trapezoidal (120°) commutation
    • Supports analog or digital hall inputs
    • Synchronous/asynchronous PWM modulation
    • Cycle-by-cycle current limit to limit phase current
    • Supports up to 100kHz PWM frequency
    • Automatic synchronous rectification to reduce power losses
  • 575mΩ RDS(ON) (Hihg Side + Low Side) low MOSFET on-state resistance at TA = 25°C
  • 1.5µA at VVM = 24V, TA = 25°C low-power sleep mode
  • 5V to 35V operating voltage range
  • 1.5A peak high output current capability
  • Built-in 5V (5%) and 30mA LDO regulator
  • Integrated current limiting eliminates external current sense resistors
  • Supports 1.8V, 3.3V, and 5V logic inputs
  • Integrated protection functions:
    • Supply Under-Voltage Lockout (UVLO)
    • Charge Pump Under-Voltage (CPUV)
    • Over-Current Protection (OCP)
    • Motor lock protection
    • Fault condition indication pin (nFAULT)
    • Optional fault diagnostics over SPI

Applications

  • BLDC motor modules
  • Small home appliances
  • Office automation machines
  • Factory automation and robotics
  • HVAC motors

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Simplified Schematic Diagram

Schematic - Texas Instruments MCT8314Z BLDC Motor Driver

Hardware Interface

Texas Instruments MCT8314Z BLDC Motor Driver
Published: 2024-07-22 | Updated: 2024-07-29