A Brushless DC Motor Driver Chip with Internal Bridge Driver

This paper proposes a brushless DC (BLDC) motor driver chip with internal bridge driver. The performance of BLDC motor is determined by the performance of bridge driver. So Laterally Diffused Metal Oxide Semiconductor (LDMOS) is adopted as power transistors of bridge driver, which can withstand high voltage and current with low onresistance. To ensure the consistency of high-side and low-side delay in bridge driver, a high-side gate driver with low delay is used. In addition, the chip has internal motor controller used for electronic commutation and dead time insertion of bridge driver. A charge pump is integrated for supplying power to high-side gate driver. The chip is designed and verified by using a 180nm SOI BCD Technology. It has 5A output current capability and 60 V maximum operating voltage, having good driving capability.