An integrated high-voltage self-powered buck converter with reduced heat generation

Abstract

In this paper, an AC-DC constant current buck converter is designed, and a novel high voltage self-powered method of chip is proposed. Through the VIN valley power supply technology, the serious problem of heating for integrated high voltage power supply of AC-DC converter is solved, and making high voltage integrated power supply of high power system possible. The chip is designed and produced in 0.18μm UHVBCD process. A 50W BUCK converter prototype with this chip as the core is developed. The test results show that the constant current performance is good, with the line regulation is 1.7%, and the load regulation is 3.2%. The chip temperature is lower than 110°C. The experimental results of prototype demonstrate the effectiveness of the proposed circuit. This design reduces peripheral devices, saves costs and improves the integration degree.