KBJ4005 is a monolithic integrated circuit developed by Yangjie Electronics Co., Ltd. It is an ultra-low power, high voltage, and fixed frequency 3-phase brushless DC motor driver. It is mainly used for driving three-phase brushless DC motor in applications such as vacuum cleaners, pumps and motorized vehicles. It has multiple protection circuits, such as: thermal protection, overvoltage protection, undervoltage protection, overcurrent protection, and over temperature protection. It adopts a fast response control system and an efficient PWM control technology, and uses a cost-effective UART communication interface for convenient and precise motor control.