Volver a Texas Instruments

Texas Instruments MCF8315D Sensorless FOC BLDC Driver

Texas Instruments MCF8315D Sensorless Field Oriented Control (FOC) Brushless-DC (BLDC) Motor Driver is a single-chip device for users driving speed-controlled 12V to 24V BLDCs. The FOC algorithm is implemented in a fixed-function state machine, so no coding is required. The algorithm configuration is stored in non-volatile EEPROM, which allows the driver to function in stand-alone mode once the driver is configured. This driver integrates three half-bridges with 40V absolute maximum capability and a low RDS(ON) of 240mΩ/250mΩ/265mΩ (high-side + low-side FETs).

The MCF8315D driver includes a built-in Low-Dropout (LDO) regulator (3.3V and 20mA) and a built-in buck regulator (3.3V/5V and 170mA). This driver features a dedicated DRVOFF pin to disable (Hi-Z) outputs and 3% speed loop accuracy with an internal clock. The MCF8315D driver offers supply Under Voltage Lockout (UVLO), motor lock detection, supply Over Voltage Protection (OVP), and configurable current limit protection functions. This driver is used in applications such as small home appliances, air purifiers, humidifier fans, residential fans, and BLDC motor modules.

Features

  • Three-phase BLDC motor driver with integrated sensorless motor control algorithm:
    • Code-free Field Oriented Control (FOC)
    • Speed, current, power, and voltage control
    • Forward and reverse windmilling support
    • Configurable power and speed limit
    • Lead angle adjustment for high efficiency
    • Improved acoustic performance with soft-start, soft-stop, and dead time compensation
    • Offline motor parameter measurement with Motor Parameter Extraction Tool (MPET)
    • Analog, PWM, frequency, or I2C based speed input
    • Configurable motor start-up and stop options
    • Flux weakening for high-speed operation
    • Anti-Voltage Surge (AVS) protection
    • Variable monitoring through DACOUT pins
  • Low MOSFET on-state resistance:
    • RGF: RDS(ON) (H+L) at TJ=25°C: 240mΩ (typical)
    • RRY: RDS(ON) (H+L) at TJ=25°C: 250mΩ (typical)
    • PWP: RDS(ON) (H+L) at TJ=25°C: 265mΩ (typical)
  • 4.5 to 35V operating voltage (40V absolute maximum)
  • 4A peak high output current capability
  • 3% speed loop accuracy with internal clock and 1% with external clock reference
  • Configurable EEPROM with R/W security to store device configuration
  • Do not require external current sense resistors and uses built-in current sensing
  • Built-in 3.3V and 20mA LDO regulator
  • Built-in 3.3V/5V and 170mA buck regulator
  • Dedicated DRVOFF pin to disable (Hi-Z) outputs
  • Spread spectrum, PWM dithering, and slew rate for EMI reduction
  • Suite of integrated protection functions:
    • Supply Under Voltage Lockout (UVLO)
    • Supply Over Voltage protection (OVP)
    • Motor lock detection
    • Configurable current limit
    • Thermal warning and shutdown (OTW/TSD)
    • Fault condition indication pin (nFAULT)

Applications

  • Small home appliances
  • Air purifiers
  • Humidifier fans
  • Residential fans
  • BLDC motor modules
  • Dishwasher pumps

Simplified Schematic Diagram

Schematic - Texas Instruments MCF8315D Sensorless FOC BLDC Driver
Publicado: 2025-01-21 | Actualizado: 2025-02-19