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 R_DS(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 7.8x6.4mm 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: R_DS(ON)(H+L) at T_J=25°C: 250mΩ(typ.)
- PWP: R_DS(ON)(H+L) at T_J=25°C: 265mΩ(typ.)
Low-power sleep mode
- 5µA (maximum) at V_VM = 24V, T_A = 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