AC7801-STEPPER
AEC-Q100 qualified stepper motor driver with microstepping and integrated current control for automotive actuators
Product Overview
Description
The AC7801-STEPPER is an automotive-qualified stepper motor driver featuring microstepping control and integrated current regulation.
With 8V to 40V supply range, 2A peak current, and up to 1/16 microstepping, it is ideal for HVAC flap actuators and headlight leveling systems.
The device includes stall detection, over-temperature protection, and SPI interface for configuration.
Product Series
AC
Primary Application
HVAC flap actuators
Key Features
- Wide 8V to 40V supply voltage range
- 2A continuous output current per phase
- Up to 1/16 microstepping resolution
- Integrated current chopper control
- Stall detection and reporting
- Over-current and over-temperature protection
- SPI interface for configuration
- AEC-Q100 Grade 1 qualified
Specifications
| Supply Voltage | 8V to 40V |
|---|---|
| Output Current | 2A continuous, 2.5A peak |
| Microstepping | Up to 1/16 step |
| On-Resistance | 0.3 ohm per phase |
| Current Control | Integrated chopper |
| Package | TSSOP-24, QFN-32 |
Applications
HVAC flap actuators
Electronic system design
Headlight leveling systems
Electronic system design
Throttle body control
Industrial automation and control
Idle air control valves
Industrial automation and control
Mirror positioning
Electronic system design
FAE Expert Insights
"The AC7801-STEPPER is an excellent solution for automotive stepper motor applications requiring precise position control. The microstepping capability provides smooth motion and reduced vibration compared to full-step operation. I have successfully used this driver in HVAC systems for precise flap control and in headlight leveling applications. The integrated current control eliminates the need for external sense resistors and current control circuits. The stall detection feature is valuable for end-position detection without additional sensors. The SPI interface allows flexible configuration of current levels and microstepping modes. For automotive stepper motor applications, this driver offers excellent integration and value."
Integrated stepper driver with microstepping for precise automotive actuator control
— Dr. Michael Chen, BeiLuo
Frequently Asked Questions
What is microstepping and why is it important?
Microstepping divides each full step of a stepper motor into smaller increments (up to 1/16 step). This provides smoother motion, reduced vibration, and more precise position control. Microstepping also reduces audible noise, which is important for automotive interior applications.
Use 1/16 microstepping for smoothest operation and lowest noise.
How does stall detection work?
Stall detection monitors motor current and back-EMF to detect when the motor stalls. When a stall is detected, the driver can stop the motor or report the condition to the MCU. This prevents damage to the motor and mechanism. Stall detection can also be used for homing without limit switches.
Use stall detection for end-position detection and motor protection.
What is the chopper current control?
The chopper current control regulates motor winding current using PWM switching. This maintains constant current regardless of supply voltage variations. The chopper frequency is programmable to optimize for motor characteristics. Current control ensures consistent torque and prevents motor overheating.
Chopper control maintains constant current for consistent motor performance.
Can AC7801-STEPPER drive different motor sizes?
Yes, the AC7801-STEPPER can drive various stepper motor sizes from NEMA 8 to NEMA 23. The 2A current capability handles most automotive actuator motors. Current can be programmed to match motor ratings. The wide supply voltage range accommodates different motor voltage requirements.
AC7801-STEPPER supports various stepper motor sizes with programmable current.
What thermal protection is included?
The AC7801-STEPPER includes over-temperature protection with automatic current reduction. If the die temperature exceeds safe limits, the driver reduces current to prevent damage. Thermal status can be monitored via SPI. This protection is essential for automotive applications with high ambient temperatures.
Thermal protection ensures reliable operation in high-temperature environments.