AC7840-MOTOR
High-performance 3-phase motor driver with FOC support and ASIL-B safety features for electric power steering
Product Overview
Description
The AC7840-MOTOR is a high-performance 3-phase motor driver featuring integrated FOC (Field Oriented Control) support.
With 12V to 60V supply, 10A peak current, and ASIL-B safety features, it is ideal for electric power steering and traction motors.
The device includes current sensing, position feedback interfaces, and comprehensive diagnostic capabilities.
Product Series
AC
Primary Application
Electric power steering
Key Features
- Wide 12V to 60V supply voltage range
- 10A continuous, 20A peak output current
- Integrated FOC algorithm support
- Dual current sense amplifiers
- Encoder and Hall sensor interfaces
- ASIL-B functional safety features
- Comprehensive diagnostic capabilities
- AEC-Q100 Grade 1 qualified
Specifications
| Supply Voltage | 12V to 60V |
|---|---|
| Output Current | 10A continuous, 20A peak |
| Gate Drive Voltage | 12V to 15V programmable |
| Control Interface | SPI and PWM |
| Safety Level | ASIL-B support |
| Package | QFN-48, LQFP-64 |
Applications
Electric power steering
Electronic system design
Electric water pumps
Electronic system design
Electric oil pumps
Electronic system design
HVAC compressor drives
Motor drive and control systems
Traction motor control
Motor drive and control systems
FAE Expert Insights
"The AC7840-MOTOR is my recommended solution for safety-critical motor control applications. The integrated FOC support enables efficient torque control for electric power steering systems. I have successfully used this driver in EPS and electric pump applications with excellent performance. The ASIL-B safety features including independent current monitoring and diagnostic capabilities provide the reliability required for safety systems. The 10A continuous current capability handles most automotive motor applications. The position feedback interfaces support both encoders and Hall sensors for flexible system design. For safety-critical motor control, this driver offers excellent performance and value."
ASIL-B motor driver with FOC support for safety-critical automotive applications
— Jennifer Liu, BeiLuo
Frequently Asked Questions
What is Field Oriented Control (FOC)?
Field Oriented Control (FOC) is an advanced motor control algorithm that provides precise torque and speed control for 3-phase motors. FOC transforms 3-phase currents into direct and quadrature components match rotor flux, enabling independent control of torque and flux. This results in smooth operation, high efficiency, and fast dynamic response. The AC7840-MOTOR includes hardware support for FOC including current sensing and PWM generation synchronized with rotor position.
FOC is essential for high-performance motor control applications requiring precise torque control.
What safety features does AC7840-MOTOR include?
The AC7840-MOTOR includes comprehensive safety features for ASIL-B compliance. Features include dual independent current sense channels for redundant current monitoring, hardware over-current protection with fast shutdown, diagnostic SPI interface for fault reporting, and independent safety monitoring outputs. The driver also includes open-load detection, short-circuit protection, and over-temperature monitoring. These features enable integration into safety-critical systems.
AC7840-MOTOR safety features support ASIL-B applications when combined with appropriate system design.
What position feedback options are supported?
The AC7840-MOTOR supports multiple position feedback options for flexible motor control. Quadrature encoder interfaces support incremental encoders with A/B/Z channels for precise position and speed measurement. Hall sensor interfaces support both 3-phase Hall and linear Hall sensors. The driver also supports sensorless operation using BEMF detection for cost-sensitive applications. The position feedback can be used for FOC commutation and speed control loops.
Select encoder for highest precision, Hall sensors for cost-effective solutions, sensorless for simple applications.
What is the gate drive capability?
The AC7840-MOTOR provides programmable gate drive with 12V to 15V output voltage and up to 2A source/sink current. The programmable drive strength allows optimization for different power MOSFETs and switching frequencies. Integrated bootstrap diodes support high-side gate drive for 100% duty cycle operation. Adjustable dead-time prevents shoot-through in half-bridge configurations. The gate drive includes under-voltage lockout to ensure proper MOSFET operation.
2A gate drive supports large MOSFETs for high-power motor applications.
Can AC7840-MOTOR be used for traction motor control?
The AC7840-MOTOR can be used for low-power traction motor control in applications such as electric scooters, golf carts, and auxiliary vehicle drives. The 10A continuous current capability supports motors up to approximately 500W at 48V. For higher power traction applications, multiple drivers can be used in parallel or higher current drivers should be selected. The FOC support and safety features make it suitable for safety-critical traction applications.
AC7840-MOTOR is suitable for low-power traction applications. Contact LiTong for higher power requirements.