高效率峰值电流模降压型开关电源转换器XD1436的研究与设计
发布时间：2018-08-13 18:16
【摘要】：当今世界,人们的生活、工作和社会的发展已经离不开由电子器件组成的电子设备,其中电源管理芯片的应用范围十分广泛。本论文结合芯片实际典型应用电路,经过详细的理论分析后,成功的设计实现了一款采用恒定频率的高效同步降压型DC-DC转换器XD1436。论文首先对电源管理芯片的发展背景以及发展现状进行了概述;在综合考虑人口、能源、环境等因素的基础上,总结了开关电源技术的特点,并对其发展趋势做出了展望;论文对开关电源的相关技术以及主要特性指标参数进行了详细的介绍;由于本文设计的芯片XD1436为降压型DC-DC转换器,本文对DC-DC转换器的BUCK、BOOST、BUCK-BOOST的基本电路结构进行了原理分析与推导;在此基础上,综合考虑芯片功能、实际应用情况以及工艺水平,确定了芯片XD1436的主要电特性指标要求,选定其控制方式后,设计了整体电路的架构。结合芯片整体工作原理及功能要求,本文对芯片XD1436进行了系统级设计,结合实际应用要求,确定了芯片XD1436的主要电特性指标,并且对XD1436芯片系统进行了系统模块划分,将芯片分为使能控制模块ENABLE、电压欠压锁存模块UVLO、基准电压模块VREF、振荡器OSC、线性斜坡补偿电路SLOPE、误差放大电路EA、PWM比较器、过温关断保护模块OTP、软启动模块Soft_Start、逻辑控制模块LOGIC等17个模块。论文给出了芯片的关键子电路的电路原理分析,并在此基础上,对每个功能模块以及整体电路的典型性能参数进行了仿真验证。该芯片采用同步整流技术,在提高了芯片转换率的同时,避免了一个外部肖特基二极管,节省了PCB板的面积;2.7V至5.5V的输入电压范围,3A的最大输出电流的特性,使得芯片XD1436成为了便携式笔记本电脑、LCD TV、机顶盒等电子产品应用的理想选择;100%的占空比,满足了芯片低输出电压纹波的要求,实现了低压降操作,并延长了便携式系统中电池的使用寿命;芯片的低输出电压纹波以及内部采用较小的电感器和电容器,使芯片获得了1MHz的高开关频率,并且引入了线性斜坡补偿技术,有效避免亚谐波振荡现象的出现;欠压锁存、过电压保护、过电流保护、过温关断等保护模块的设计,提高了该芯片的可靠性和使用寿命;采用简单的分压结构,得到0.6V的反馈基准电压;为防止芯片启动过程中浪涌电流和过冲电压对芯片造成损坏,降低其使用寿命,芯片XD1436设计了软启动功能模块。论文对XD1436系统及主要功能模块进行了详细的理论分析,并基于0.5μmCMOS工艺,利用Cadence完成了芯片的关键子模块以及整体性能的设计与前仿真验证。关键子模块以及整体性能的仿真结果表明本文所设计的芯片XD1436各项性能指标满足设计要求,达到了预定的设计目标。芯片XD1436内部同步整流技术,软启动功能、过电压保护、过电流保护、过温关断等保护模块的设计以及内部较小的电感器和电容器的应用,提高了芯片XD1436的可靠性。
[Abstract]:In today's world, people's life, work and social development have been inseparable from the electronic devices, in which the power management chip is widely used. After detailed theoretical analysis, a high efficiency synchronous DC-DC converter XD1436 with constant frequency is designed and implemented in this paper. Firstly, the development background and current situation of power management chip are summarized, and the characteristics of switching power supply technology are summarized based on the comprehensive consideration of population, energy, environment and so on, and the development trend of switching power supply is prospected. The related technology and main characteristic parameters of switching power supply are introduced in detail, because the chip XD1436 designed in this paper is a step-down DC-DC converter, the basic circuit structure of DC-DC converter BUCK-BOOST is analyzed and deduced in principle. On this basis, considering the chip function, the actual application and the process level, the main electrical characteristic requirements of the chip XD1436 are determined, and the control mode is selected, and the whole circuit structure is designed. Combined with the whole working principle and function requirement of the chip, this paper designs the chip XD1436 at the system level, determines the main electrical characteristic index of the chip XD1436, and divides the system module of the XD1436 chip system. The chips are divided into enable control module (Enable), voltage under-voltage latch module (UVLOL), reference voltage module (VREF), OSCO oscillator, linear ramp compensation circuit (SLOOPEE), error amplifier circuit (EAA) PWM comparator. OTP, SoftStart, LOGIC, etc. In this paper, the circuit principle of the key sub-circuits of the chip is analyzed, and the typical performance parameters of each functional module and the whole circuit are simulated and verified. The chip adopts synchronous rectifier technology, which not only improves the conversion rate of the chip, but also avoids an external Schottky diode, and saves the characteristics of the maximum output current of the input voltage range from 2.7V to 5.5V of the PCB board. The chip XD1436 has become the ideal choice of duty cycle for portable notebook computer LCD TV, set-top box and other electronic products, which meets the requirements of low output voltage ripple of the chip, and realizes the operation of low voltage drop. The battery life of the portable system is prolonged, the low output voltage ripple of the chip and the inner inductor and capacitor are adopted, which makes the chip obtain the high switching frequency of 1MHz, and introduces the technology of linear ramp compensation. The design of under-voltage latch, over-voltage protection, over-current protection, over-temperature turn-off and other protection modules can improve the reliability and service life of the chip. The feedback reference voltage of 0.6V is obtained. In order to prevent the surge current and overshoot voltage from damaging the chip and reduce its service life, the chip XD1436 has designed the soft start function module. In this paper, the XD1436 system and its main function modules are analyzed in detail, and based on the 0.5 渭 mCMOS process, the key sub-modules of the chip and the design and pre-simulation of the whole performance are completed by using Cadence. The simulation results of the key sub-modules and the overall performance show that the performance indexes of the chip XD1436 designed in this paper meet the design requirements and achieve the intended design objectives. The design of XD1436 internal synchronous rectifier technology, soft start function, over-voltage protection, over-current protection, over-temperature turn-off and the application of smaller inductor and capacitor can improve the reliability of chip XD1436.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46
本文编号：2181794
[Abstract]:In today's world, people's life, work and social development have been inseparable from the electronic devices, in which the power management chip is widely used. After detailed theoretical analysis, a high efficiency synchronous DC-DC converter XD1436 with constant frequency is designed and implemented in this paper. Firstly, the development background and current situation of power management chip are summarized, and the characteristics of switching power supply technology are summarized based on the comprehensive consideration of population, energy, environment and so on, and the development trend of switching power supply is prospected. The related technology and main characteristic parameters of switching power supply are introduced in detail, because the chip XD1436 designed in this paper is a step-down DC-DC converter, the basic circuit structure of DC-DC converter BUCK-BOOST is analyzed and deduced in principle. On this basis, considering the chip function, the actual application and the process level, the main electrical characteristic requirements of the chip XD1436 are determined, and the control mode is selected, and the whole circuit structure is designed. Combined with the whole working principle and function requirement of the chip, this paper designs the chip XD1436 at the system level, determines the main electrical characteristic index of the chip XD1436, and divides the system module of the XD1436 chip system. The chips are divided into enable control module (Enable), voltage under-voltage latch module (UVLOL), reference voltage module (VREF), OSCO oscillator, linear ramp compensation circuit (SLOOPEE), error amplifier circuit (EAA) PWM comparator. OTP, SoftStart, LOGIC, etc. In this paper, the circuit principle of the key sub-circuits of the chip is analyzed, and the typical performance parameters of each functional module and the whole circuit are simulated and verified. The chip adopts synchronous rectifier technology, which not only improves the conversion rate of the chip, but also avoids an external Schottky diode, and saves the characteristics of the maximum output current of the input voltage range from 2.7V to 5.5V of the PCB board. The chip XD1436 has become the ideal choice of duty cycle for portable notebook computer LCD TV, set-top box and other electronic products, which meets the requirements of low output voltage ripple of the chip, and realizes the operation of low voltage drop. The battery life of the portable system is prolonged, the low output voltage ripple of the chip and the inner inductor and capacitor are adopted, which makes the chip obtain the high switching frequency of 1MHz, and introduces the technology of linear ramp compensation. The design of under-voltage latch, over-voltage protection, over-current protection, over-temperature turn-off and other protection modules can improve the reliability and service life of the chip. The feedback reference voltage of 0.6V is obtained. In order to prevent the surge current and overshoot voltage from damaging the chip and reduce its service life, the chip XD1436 has designed the soft start function module. In this paper, the XD1436 system and its main function modules are analyzed in detail, and based on the 0.5 渭 mCMOS process, the key sub-modules of the chip and the design and pre-simulation of the whole performance are completed by using Cadence. The simulation results of the key sub-modules and the overall performance show that the performance indexes of the chip XD1436 designed in this paper meet the design requirements and achieve the intended design objectives. The design of XD1436 internal synchronous rectifier technology, soft start function, over-voltage protection, over-current protection, over-temperature turn-off and the application of smaller inductor and capacitor can improve the reliability of chip XD1436.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46
【参考文献】
相关硕士学位论文 前2条
1 刘彬;基于PWM控制模式的电流型DC-DC降压转换器的研究[D];西安电子科技大学;2008年
2 谢应孝;Buck型DC/DC开关电源的研究与设计[D];黑龙江大学;2010年
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