MCF8315A обеспечивает одночипное бескодовое решение FOC без датчиков для заказчиков, управляющих скоростью двигателей постоянного тока без щёток (BLDC) или синхронных двигателей с постоянными магнитами (PMSM) в диапазоне напряжений 12–24 В и пикового тока до 4 А. MCF8315A интегрирует три полумоста с абсолютным максимальным напряжением 40 В и низким сопротивлением в открытом состоянии RDS(ON) 240 мОм (высоковольтные и низковольтные ключи на полевых транзисторах). В MCF8315A также интегрированы цепи управления питанием, включая понижающий регулятор напряжения с регулируемым выходным напряжением (3,3 В / 5 В, 170 мА) и стабилизатор напряжения последовательного типа (LDO) (3,3 В / 20 мА), которые могут использоваться для питания внешних цепей.

Конфигурация алгоритма FOC может храниться во внешней энергонезависимой памяти EEPROM, что позволяет устройству работать автономно после его настройки. Устройство получает команду скорости через вход ШИМ, аналоговое напряжение, квадратный сигнал переменной частоты или команду I²C. В микросхеме MCF8315A интегрировано большое количество функций защиты, предназначенных для защиты устройства, двигателя и системы от аварийных ситуаций.

• Three-phase BLDC motor driver with integrated sensorless motor control algorithm
  • Code-free Field Oriented Control (FOC)
  • Analog, PWM and freq. based speed input modes: available only when MCF8315A is configured as a standby device (DEV_MODE = 0b)
  • I 2C 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
• 4.5- to 35-V operating voltage (40-V abs max)
• High output current capability: 4-A peak
• Low MOSFET on-state resistance
  • R DS(ON) (HS + LS) at T A = 25°C : 240-mΩ (typ.)
• Low power sleep mode : Refer
  • 5-µA (maximum) at V VM = 24-V, T A = 25°C
• Speed loop accuracy: 3% with internal clock and 1% with external clock reference
• Supports up to 75-kHz PWM frequency for low inductance motor support
• Does not require external current sense resistors; uses built-in current sensing
• Built-in 3.3-V, 20-mA LDO regulator
• Built-in 3.3-V/5-V, 170-mA 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 I 2C interface

Key Features

1. Integrated sensorless FOC motor control
MCF8315A1VRGFR includes a built-in sensorless motor-control algorithm with code-free Field-Oriented Control. This helps reduce firmware development work and enables smooth, efficient BLDC motor control without Hall sensors.

2. Fully integrated three-phase power stage
The device integrates three half-bridge MOSFET power stages, so designers do not need to build a separate external MOSFET bridge for lower-power BLDC motor applications. This reduces component count, PCB area, and design complexity.

3. 4.5V to 35V operating voltage range
The wide input range makes it suitable for common 12V and 24V motor systems, as well as battery-powered BLDC motor applications. TI specifies a 40V absolute maximum voltage rating.

4. 4A peak output current capability
The driver supports up to 4A peak current, making it suitable for small to medium-power BLDC motors such as fans, pumps, blowers, and compact motion-control systems.

5. Low MOSFET on-resistance
The integrated MOSFETs provide a typical combined high-side plus low-side RDS(on) of 240mΩ at 25°C, helping reduce conduction loss and improve motor-drive efficiency.

6. Multiple speed-control input options
The device supports analog, PWM, frequency-based, and I²C speed input modes, giving system designers flexibility to control motor speed from simple analog circuits, MCUs, or digital control systems.

7. Motor Parameter Extraction Tool support
TI supports offline motor-parameter measurement through its Motor Parameter Extraction Tool (MPET), helping simplify motor tuning and accelerate design validation.

8. 5-point configurable speed profile
The integrated motor-control algorithm supports a 5-point configurable speed profile, allowing designers to tune motor behavior for different speed zones and load conditions.

9. Windmilling support
The device supports windmilling operation through forward resynchronization and reverse drive, which is useful when a fan or motor may already be spinning before startup.

10. Low-power sleep mode
MCF8315A supports low-power sleep operation, with TI listing 5µA maximum sleep current at 24V and 25°C, helping reduce standby power in battery-powered or energy-sensitive products.

11. Protection and acoustic performance features
The device includes features such as anti-voltage-surge protection and automatic dead-time compensation, helping improve reliability and acoustic performance in BLDC motor applications.