At present,the automobile industry is undergoing profound changes from traditional mechanical control to electronic and intelligent control.The body control system not only needs to manage basic functions such as seats,doors and windows,tailgate,but also needs to support personalized setting and automatic operation,such as multi-directional adjustment of power seats,anti-pinch protection of power windows,and regional centralized control.The realization of these functions depends on electronic devices that can drive multiple motors or loads efficiently and accurately.To this end,the automotive control system solution introduced by Yingshangwei aims to provide high-performance motor drivers for complex body functions.
 

The motor driver DR7804Q,a multi-channel gate driver specially designed for automobile control system,is introduced by Yingshangwei.It has a four-way half-bridge structure and can independently drive up to eight external N-channel MOSFET.The motor driver not only supports the parallel control of multiple brushed DC motors,but also can be configured in high-side switching mode,which is suitable for various load types including motors and solenoid valves,especially for multi-actuator scenes such as electric seats,electric doors and electric tailgates.In the control mode,DR7804Q motor driver provides flexible interface options.In addition to accurate parameter configuration and real-time control through 24-bit SPI interface,it also supports three PWM inputs to directly control four groups of half-bridges,which greatly improves the flexibility of system design.
 

The motor driver DR7804Q integrates two current sampling amplifiers(CSA)with high common mode,high speed and high precision.Combined with its unique PWM anti-interference technology,it can realize motor ripple sampling and locked-rotor protection without Hall sensor,which provides a reliable signal basis for anti-pinch and other safety functions.
 

In terms of driving ability,DR7804Q adopts intelligent gate driving architecture,which provides 8-speed software-adjustable driving current,up to 96mA,and supports adaptive switching speed adjustment.In addition,the motor driver device has a built-in handshake logic protection mechanism,which effectively prevents the upper and lower pipes from going straight through,and the system security is significantly improved.
 

In terms of protection and diagnosis,the motor driver DR7804Q has multiple protection designs,including power supply voltage monitoring,over-current protection,charge pump state detection,temperature alarm and overheating shutdown,watchdog timer and load open/short circuit diagnosis.Each driver supports the monitoring of drain-source voltage of external MOSFET,which can quickly identify and locate faults.
 

With its high integration,flexible interface configuration,precise detection function and comprehensive system protection mechanism,DR7804Q motor driver provides a reliable and efficient solution for modern automobile body control system.With the further evolution of automotive electronic architecture to regional control and centralized control,such high-performance,multi-channel driver chips will play an increasingly important role in improving the intelligent level and user experience of the whole vehicle.


Keywords: motor driver