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Texas Instruments MCT8316Ax Trapezoidal Control BLDC Motor Drivers

Texas Instruments MCT8316Ax High-Speed Sensorless Trapezoidal Control Brushless DC (BLDC) Motor Drivers provide single-chip, code-free, sensorless trapezoidal solutions for applications requiring high-speed operation (up to 3kHz electrical) or very fast startup times (< 50ms capable) for 12V to 24V BLDCs up to 8A peak current. The MCT8316Ax integrates three 1/2H bridges with 40V absolute maximum capability and a very low R_DS(ON) of 95mΩ (high-side plus low-side). Power management features of an adjustable buck regulator and LDO generate the device’s 3.3V or 5.0V voltage rails and can power external circuits. The sensorless trapezoidal control is highly configurable through register settings (MCT8316AV) or hardware pins (MCT8316AT) ranging from motor start-up behavior to closed-loop operation. Register settings for the MCT8316AV component can be set in non-volatile EEPROM allowing the device to operate stand-alone once configured. These devices receive a speed command through a PWM input, analog voltage, or I²C command.

Features

Three-phase BLDC motor driver with an integrated sensorless motor control algorithm
- Code-free high-speed trapezoidal control
- Supports up to 3kHz (electrical frequency)
- Very fast startup time (<50ms)
- Fast deceleration (<150ms)
- Supports 120° or 150° modulation to improve acoustic performance
- Windmilling support through forward resynchronization and reverse drive
- Active Demagnetization to reduce power losses
- Configurable motor startup and stop options
- Optional closed-loop speed control
- Anti-voltage surge protections prevent overvoltage
- Variable monitoring through DACOUT
4.5V to 35V operating voltage (40V absolute maximum)
High 8A peak output current capability
Low MOSFET on-state resistance, 95mΩ R_DS(ON) (HS + LS) at T_A = +25°C
Low power sleep mode, 3µA (maximum) at VVM = 24V, T_A = +25°C
Speed loop accuracy
- 3% with an internal clock
- 1% with an external clock reference

Flexible device configuration options
- MCT8316AV model offers an I²C interface (EEPROM nonvolatile memory for storing configuration)
- MCT8316AT model offers a hardware pin based configuration
Supports up to 100kHz PWM frequency for low inductance motor support
It does not require an external current sense resistor
Built-in 3.3V ±5%, 20mA LDO regulator
Built-in 3.3V/5V, 170mA buck regulator
DRVOFF independent pin to disable output
Spread spectrum and slew rate for EMI mitigation
A suite of integrated protection features
- Supply undervoltage lockout (UVLO)
- Motor lock detection (5 different types)
- Overcurrent protection (OCP)
- Thermal warning and shutdown (OTW/OTSD)
- Fault condition indication pin (nFAULT)
- Optional fault diagnostics over I²C interface

Applications

Brushless DC (BLDC) motor modules
Robotic vacuum suction motors
Motorcycle fuel pumps

Appliance fans and pumps
Automotive fans and blowers
Medical CPAP blowers

Specifications

1x PWM, Analog, and Serial control interfaces
4.5V to 35V power supply voltage range
8A peak output winding current
-0.1V to 5.5V logic input voltage range
-0.1V to 5.5V open-drain pull-up voltage range
5mA open-drain output current capability
0.01kHz to 100kHz PWM input frequency range
8-bit to 12-bit PWM input resolution range
7.00mm x 5.00mm x 1.00mm, 40-pin VQFN package

0.5mm pin pitch
Temperature ranges
- -40°C to +125°C operating
- -65°C to +150°C storage
Electrostatic discharge (ESD)
- ±1000V for the Human Body Model (HBM) per ANSI/ESDA/JEDEC JS-001
- ±250V for the Charged-Device Model (CDM) per ANSI/ESDA/JEDEC JS-002

Texas Instruments MCT8316Ax Trapezoidal Control BLDC Motor Drivers

Features

Applications

Specifications

Simplified Schematic

MCT8316AT Block Diagram

MCT8316AV Block Diagram

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