一款電流模同步升壓型DC-DC轉換器XD1407的設計
[Abstract]:Based on the research project of Xi'an University of Electronic Science and Technology, "theoretical research and design of power management integrated circuit", a DC-DC converter XD1407. is designed in this paper, aiming at the design of high performance chip. This paper first introduces the switching power supply, and then analyzes the importance and development trend of the DC-DC converter, the core component of the switching power supply, according to the current market situation. Then the basic theoretical knowledge and working process of DC converter are described in detail, and the control mode and efficiency of boost DC-DC converter are studied carefully. According to the characteristics of this chip, the appropriate control mode is chosen, that is, current mode. At the same time, a solution to improve efficiency is proposed, and then the overall architecture of the chip XD1407 is analyzed and designed, the loop stability of the chip is systematically modeled, and the zero pole position of the chip is deduced. The stability of the chip is verified by simulation, and then the key modules of the chip XD1407 are designed and verified, and the results meet the design requirements. The last chapter of this paper is the introduction of the overall circuit simulation results of the chip XD1407. The working frequency of the boost type XD1407 is 500kHz, which is fixed and invariable. It adopts peak current mode control, built-in power switch and synchronous rectifier, which makes the peripheral circuit simple when it is applied. The PCB area is saved, the working voltage range of XD1407 is 2.5V-5V, the peak current is 8A and the load capacity can reach 5A. XD1407 has two working modes, PWM mode and light load mode. When the load is small, it can be judged that the chip works in light load mode by detecting the information of inductance current. In this mode, the chip can be put into dormancy state after several cycles of continuous operation. During the dormancy period, the main switch tube and the synchronous tube can not be switched on, so that most of the modules inside the chip are turned off, so that the static current of the chip is reduced. When reduced to 55 U A, the conduction loss and switching loss can be almost zero, and the output voltage begins to decrease. In the circuit, the output voltage drop is controlled by detecting the feedback voltage FB, the pulse control signal is output by the high-precision comparator, and the control chip exits the dormant state after the processing of the logic circuit, so it works repeatedly. With the increasing of the load, the inductance current increases, the chip is converted to PWM mode, and the two modes can be switched smoothly, which ensures that the chip can get higher conversion efficiency in the whole load range. At the same time, it has small output voltage ripple, through the careful study of booster DC-DC converter, then combined with theoretical knowledge to model and analyze, determine the chip frequency compensation scheme, by adjusting the relevant parameters, Using the simulation software to select the appropriate bandwidth frequency and phase margin, the loop of the system can work stably. A variety of protection mechanisms are designed in XD1407 at the same time, so that the input voltage of the chip is low. XD1407 is based on a company's 0.35 u M CMOS process and is verified by Cadence software to ensure that the simulation results can meet the design requirements under different device models, different power supply and temperature. The simulation results show that the chip has good performance and meets the design requirements.
【學位授予單位】:西安電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM46
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