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http://www.ti.com/general/docs/suppproductinfo.tsp?distId=26&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fmct8315a”>View Datasheet

Texas Instruments MCT8315A FET BLDC Driver

Texas Instruments MCT8315A FET Brushless DC (BLDC) Driver is a single-chip, code-free, and sensorless trapezoidal control three-phase BLDC motor driver with 3kHz electrical frequency. This BLDC driver is designed for 12V to 24V BLDC motors requiring up to 4A peak current. The MCT8315A driver integrates three ½-bridges with 40V absolute maximum capability and a low RDS(ON) of 240mΩ (high-side + low-side FETs). This BLDC driver features built-in power management circuits, including a voltage-adjustable buck regulator and LDO that can be used to power external circuits. 

The MCT8315A driver offers speed loop accuracy of 3% with an internal clock and 1% accuracy with an external clock reference. The integrated protection features include Supply Under Voltage Lockout (UVLO), supply Over Voltage Protection (OVP), motor lock detection, Overcurrent Protection (OCP), thermal warning, and shutdown. Typical applications include BLDC motor modules, robotic vacuum suction motors, motorcycle fuel pumps, and CPAP machines.

Features

  • Three-phase BLDC motor driver with integrated sensorless motor control algorithm:
    • Code-free high-speed trapezoidal control
    • Supports up to 3kHz (electrical frequency)
    • Very fast start-up time (<50 ms)
    • Fast deceleration (<150 ms)
    • Supports 120° or 150° modulation to improve acoustic performance
    • Windmilling support through forward resynchronization and reverse drive
    • Analog, PWM, frequency, or I2C-based speed input
    • Active demagnetization to reduce power losses
    • Configurable motor start-up and stop options
    • Closed speed/power loop options
    • Anti-Voltage Surge (AVS) protection prevents DC bus voltage spikes during motor deceleration
  • Customer-configurable non-volatile memory (EEPROM) to store device configuration
  • Supports up to 100kHz PWM frequency for low inductance motor support
  • Does not require external current sense resistors and uses built-in current sensing
  • Built-in 3.3V, 20mA LDO regulator
  • Built-in 3.3V/5V, 170mA buck regulator
  • Dedicated DRVOFF pin to disable (Hi-Z) outputs
  • Spread spectrum and slew rate for EMI mitigation
  • Suite of integrated protection features:
    • Supply Under Voltage Lockout (UVLO)
    • Supply Over-Voltage Protection (OVP)
    • Motor lock detection (5 different types)
    • Overcurrent Protection (OCP)
    • Thermal warning and shutdown (OTW/TSD)
    • Fault condition indication pin (nFAULT)
    • Optional fault diagnostics over the I2C interface
       

Specifications

  • 4.5V to 35V operating voltage (40V abs maximum)
  • Low-power sleep mode:
    • 5µA (maximum) @ VVM = 24V, TA = 25°C
  • Low MOSFET on-state resistance:
    • RDS(ON) (HS + LS) @ TA = 25°C : 240mΩ (typical)
  • 4A high output current capability
  • Speed loop accuracy:
    • 3% with an internal clock and 1% with the external clock reference

Applications

  • Brushless-DC (BLDC) motor modules
  • Robotic vacuum suction motors
  • Motor cycle fuel pumps
  • Appliance fans and pumps
  • Automotive fan and blowers
  • CPAP machines

Block Diagram

Block Diagram - Texas Instruments MCT8315A FET BLDC Driver

Simplified Schematic

Schematic - Texas Instruments MCT8315A FET BLDC Driver

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Texas Instruments MCT8315A FET BLDC Driver