| With the demands of power electronics technology and switching power supply constantly developing ahead, new technologies are emerging in an endless. Switching power supply was widely used by the people because of its features such as high efficiency, small size, and high level of integration.In this paper the design of research projects comes from Xidian University of the "key technology theoretical research of high-performance and high integration mixed signal IC's." As the TFT-LCD (active-matrix thin-film transistor liquid-crystal display) display has become the mainstream and had the great market, a DC/DC converter XDJ0618 integrated OPAs (operational amplifiers) has been designed. It is a BOOST DC/DC converter which integrated the two linear regulators. The combination of external charge pump devices, DC/DC converter of internal control and a number of operational amplifiers together provides a complete power management solution for TFT-LCD panel. The chip is adopted current-mode control, so that either its response to the supply voltage or its transient response to load changes is fast. This paper describes the control method of the chip, the definition of indicators, the design of system program, the implementation and simulation of the function in detail. Based on the rapid development of TFT-LCD and the demands of the market, the design of the chip is of great significance.The chip was designed with a foreign company BCD process. Now the circuit design has been completed and simulated. HSPICE simulation results show that many important specifications of the chip meet the design requirements. The input supply voltage can be as low as 2.6 volts, its fixed frequency is about 1.2 MHz, the efficiency can reach above 85% and its transient response is better. |
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