Multi-mode High-efficiency PWM AC/DC Controller Design

Abstract

This paper proposes a multi-mode pulse-width modulation (PWM) AC/DC controller, which was implemented on a 40-V 0.8-μm one-poly two-metal (1P2M) CMOS process. It can change the operation mode by using an inner logic controller to improve the conversion efficiency under all load conditions. The necessary protection circuits are integrated on chip to reduce the number and size of the discrete components. The area of the chip is as small as 1410 X 730 um2. The standby power is lower than 100mW, and the conversion efficiency is higher than 85%. Test results have met the most stringent power consumption standards of “Energy Star VIâ€. The Design has achieved the industrial mass production, used in portable electronic device adapter.