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Texas Instruments MCF8315C/MCF8315C-Q1 FOC BLDC Motor Driver

Texas Instruments MCF8315C/MCF8315C-Q1 FOC Three-Phase BLDC Motor Driver provides a single-chip, code-free, sensorless FOC solution for customers driving speed-controlled Permanent Magnet Synchronous motor (PMSM) or 12V to 24V brushless-DC motors (BLDC) up to 4A peak current. The MCF8315C/MCF8315C-Q1 integrates three 1/2-bridges with 40V absolute maximum capability and a low RDS(ON) of 250/265mΩ (high-side + low-side FETs). MCF8315C/MCF8315C-Q1 integrates power management circuits, including a voltage-adjustable buck regulator (3.3V/5V, 170mA) and LDO (3.3V/20mA) that can be used to power external circuits.

The FOC algorithm configuration can be stored in non-volatile EEPROM. This feature allows the device to operate stand-alone once it has been configured. The device receives a speed command through a variable frequency square wave, PWM input, analog voltage, or I2C command. Many protection features are integrated into the MCF8315C/MCF8315C-Q1 to protect the device, system, and motor against fault events. The MCF8315C/MCF8315C-Q1 is available in three packages – 40-pin 7x5mm wettable-flank QFN (RGF), 32-pin 6x4mm wettable-flank QFN (RRY) and 24-pin 7.8×6.4mm HTSSOP (PWP). The CF8315C-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Three-phase BLDC motor driver with integrated sensorless motor control algorithm
    • Code-free Field Oriented Control (FOC)
    • Offline motor parameters measurement with Motor Parameter Extraction Tool (MPET)
    • 5-point configurable speed profile support
    • Windmilling support through forward resynchronization and reverse drive
    • Analog, PWM, freq., or I2C-based speed input
    • Configurable motor start-up and stop options
    • Anti-voltage surge (AVS) protection
    • Improved acoustic performance with automatic dead time compensation
    • Variable monitoring through DACOUT pin
  • 4.5V to 35V operating voltage (40V abs max)
  • High output current capability: 4A peak
  • Low MOSFET on-state resistance
    • RRY: RDS(ON)(H+L) at TJ=25°C: 250mΩ(typ.)
    • PWP: RDS(ON)(H+L) at TJ=25°C: 265mΩ(typ.)
  • Low-power sleep mode
    • 5µA (maximum) at VVM = 24V, TA = 25°C
  • Speed loop accuracy: 3% with internal clock and 1% with external clock reference
  • Customer-configurable non-volatile memory (EEPROM) to store device configuration
  • Supports up to 60kHz PWM frequency for low inductance motor support
  • Does not require external current sense resistors; 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)
    • Over current protection (OCP)
    • Thermal warning and shutdown (OTW/TSD)
    • Fault condition indication pin (nFAULT)
    • Optional fault diagnostics over the I2C interface

Applications

  • Brushless-DC (BLDC) motor modules
  • Residential and living fans
  • Air purifiers and humidifier fans
  • Washer and dishwasher pumps
  • Automotive fans and blowers
  • CPAP machines

Simplified Schematic

Schematic - Texas Instruments MCF8315C/MCF8315C-Q1 FOC BLDC Motor Driver

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Texas Instruments MCF8315C/MCF8315C-Q1 FOC BLDC Motor Driver