FA5547

FA5553/5547 Series of PWM Control Power Supply ICs with Multi-functionality and Low Standby Power Masanari Fujii Hiroshi Maruyama Kokou Boku 1. Introduction In recent years, global environmental warming has come to be addressed as a worldwide problem and energy savings has become critical for all electric products. In particular, televisions, audio components, notebook computers, printers and other such peripheral devices that are often continuously plugged into an electrical outlet remain in their standby state for a longer duration of time than their actual time of usage, and therefore functions for reducing the power consumption during standby have become essential. Requests for lower standby power consumption in power supply units have also intensified year after year. In response to these requests, Fuji Electric has already developed a series of control ICs for use in switching mode power supply units to convert commercial AC power (100 V or 240 V) to a DC power supply. Recently, Fuji Electric has developed the FA5553 / 5547 series of 8-pin current mode PWM (pulse width modulation) control power supply ICs which feature enhanced low standby power performance and added protection functions suitable for various products. An overview of this new product series is presented below. 2. Product Overview Fuji Electric has developed a series of AC-DC power supply ICs for driving externally attached power MOSFETs fabricated using a 30 V CMOS (complementary metal-oxide-semicon...