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Texas Instruments MCF8315A FET BLDC Driver

Texas Instruments MCF8315A FET BLDC Driver is a single-chip, code-free, and sensorless Field Oriented Control (FOC) control three-phase BLDC motor driver with code-free FOC. This Brushless-DC (BLDC) motor driver is designed for driving speed-controlled 12V to 24V BLDC or Permanent Magnet Synchronous Motor (PMSM) requiring up to 4A peak current. The MCF8315A driver integrates three ½-bridges with 40V absolute maximum capability and a low R_DS(ON) of 240mΩ. This 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. This driver supports up to 75kHz PWM frequency for low inductance motor support. 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 air purifiers and humidifier fans, BLDC motor modules, washer and dishwasher pumps, and CPAP machines.

Features

Three-phase BLDC motor driver with integrated sensorless motor control algorithm:
- Code-free Field Oriented Control (FOC)
- Analog, PWM, and frequency-based speed input modes:
  - Available only when MCF8315A is configured as a standby device (DEV_MODE = 0b)
- I²C-based speed input mode:
  - Available in both sleep (DEV_MODE = 1b) and standby devices (DEV_MODE = 0b)
- Offline motor parameters measurement with Motor Parameter Extraction Tool (MPET)
- 5-point configurable speed profile support
- Windmilling support through forward resynchronization and reverse drive
- Anti-Voltage Surge (AVS) protection
- Improved acoustic performance with automatic dead time compensation

Supports up to 75kHz PWM frequency for low inductance motor support
Does not require external current sense resistors and uses built-in current sensing
Built-in 3.3V, 20-mA 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

Specifications

4.5V to 35V operating voltage (40V abs maximum)
Low-power sleep mode:
- 7µA to 65µA (maximum) @ V_VM = 24V, T_A = 25°C
Low MOSFET ON-state resistance
- R_DS(ON) (HS + LS) @ T_A = 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
Residential and living fans
Air Purifiers and humidifier fans

Washer and dishwashers pumps
Automotive fan and blowers
CPAP machines

Texas Instruments MCF8315A FET BLDC Driver

Features

Specifications

Applications

Block Diagram

Simplified Schematic

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