A Variable Mode Of Operation Of Ac / Dc Power Management Chip Design

As the development of technique of electronic, the internship between electronic equipment and people has gone deeply. In 1990s the switching power supply entered the field of electronic equipment, such as electronic supervise power supply and control equipment power supply .The primary technique of switching power supply is control IC, which is used widely because of its high integrity good cost performance simple circuit and high performance.The circuit of this paper is highly evaluated in usage for power supply of laptop battery TV supervisor according to its simple and low cost. In this paper, a current model controlled PWM switching power supply is proposed, which designed by TSMC 1.0μm SPDM 5V/40V/700V HVCMOS technology. When the IC worked fluently, it performs excellently in off-line switching condition. The switching frequency of the IC, which swiches into skip cycle model when lower than 0.5 voltage, in ordinary working condition is 100 k hertz while the VOUT is about 12 voltage with the soft-start to avoid the over current in start process, skip-cycle to improve switching efficiency under light load condition and ovp otp and ocp.In this paper, it introduces the working process of the common current model switching power supply and this novel power supply with the emphasis osc reference bias fb_ctrl digital soft-start ovp otp and ovp parts. Then it discusses the principle of layout design and proposes some layouts of important devices with the analysis of them.The simulation of the whole IC is done by Calibre and Hspice.All the designs are checked through DRC and LVS.