AC7840-HIGHCURRENT
High-power 3-phase motor driver with 30A peak current and advanced FOC support for electric power steering applications
Product Overview
Description
The AC7840-HIGHCURRENT is a high-power 3-phase motor driver designed for demanding automotive motor control applications.
With 12V to 60V supply range, 30A peak current, and advanced FOC support, it is ideal for electric power steering and high-power pumps.
The device includes dual current sensing, position feedback interfaces, and ASIL-B safety features.
Product Series
AC
Primary Application
Electric power steering
Key Features
- Wide 12V to 60V supply voltage range
- 15A continuous, 30A peak output current
- High-current integrated gate drivers
- Dual current sense amplifiers
- Encoder and resolver interfaces
- ASIL-B functional safety features
- Comprehensive diagnostic capabilities
- AEC-Q100 Grade 1 qualified
Specifications
| Supply Voltage | 12V to 60V |
|---|---|
| Output Current | 15A continuous, 30A peak |
| Gate Drive Voltage | 12V to 15V programmable |
| Current Sensing | Dual high-side/low-side |
| Safety Level | ASIL-B support |
| Package | QFN-56, LQFP-80 |
Applications
Electric power steering
Electronic system design
High-power water pumps
Electronic system design
Electric oil pumps
Electronic system design
HVAC compressor drives
Motor drive and control systems
High-power cooling fans
Electronic system design
FAE Expert Insights
"The AC7840-HIGHCURRENT is my recommended solution for high-power automotive motor control applications. The 30A peak current capability handles demanding electric power steering requirements with margin. The high-current gate drivers can drive large MOSFETs for high-power applications. I have successfully used this driver in EPS systems where precise torque control and high reliability are critical. The dual current sensing provides redundant measurement for safety-critical applications. The ASIL-B features support safety system design with comprehensive diagnostics. For high-power automotive motor control, this driver offers excellent performance and safety features."
High-current 3-phase driver with ASIL-B for electric power steering and high-power pumps
— Jennifer Liu, BeiLuo
Frequently Asked Questions
What external components are required for high-current operation?
The AC7840-HIGHCURRENT requires external power MOSFETs for the motor bridge, current sense resistors for measurement, and bootstrap capacitors for high-side gate drive. The driver provides integrated gate drive, control logic, and protection circuits. For 30A peak operation, select MOSFETs with adequate current rating.
Select external MOSFETs based on current requirements and thermal constraints.
What is ASIL-B support?
ASIL-B (Automotive Safety Integrity Level B) support includes hardware safety features for functional safety compliance. The driver includes dual current sensing for redundancy, comprehensive diagnostics, and fault reporting. These features enable use in safety-related motor control applications.
ASIL-B features support safety-critical motor control applications.
Can AC7840-HIGHCURRENT drive brushless DC motors?
Yes, the AC7840-HIGHCURRENT can drive 3-phase brushless DC motors with appropriate control software. The driver provides three half-bridge gate drivers for BLDC motor control. Hall sensor or sensorless control algorithms run on the external MCU. The high current capability supports large BLDC motors.
AC7840-HIGHCURRENT supports both BLDC and PMSM motor control.
What diagnostic features are included?
The AC7840-HIGHCURRENT includes comprehensive diagnostics: over-current detection, short-circuit protection, open-load detection, over-temperature monitoring, and undervoltage lockout. Fault conditions are reported via SPI interface. These diagnostics support predictive maintenance and fault isolation.
Comprehensive diagnostics enable fault detection and predictive maintenance.
What gate drive voltage is recommended?
The AC7840-HIGHCURRENT supports programmable gate drive voltage from 12V to 15V. Higher gate drive voltage provides better MOSFET conduction for high-current applications. 15V is recommended for high-power applications. 12V may be used for lower power to reduce gate drive losses.
Use 15V gate drive for high-current, 12V for lower power applications.