一种新型升压变换器的IC设计  

A New IC Design of Boost Convertor

作　　者：傅科成[1] 冯勇建[1] 洪明[1] 

机构地区：[1]厦门大学物理与机电工程学院,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2011年第4期734-738,共5页Journal of Xiamen University：Natural Science

基　　金：福建省重大科技项目(2010H6025)

摘　　要：针对便携式电子产品电源功耗过大而降低了电池寿命的问题,设计了一款高带载能力、高效率的电流脉宽调制模式的升压型DC-DC变换器控制芯片.通过采用可提高带载能力的分段线性斜波补偿技术,解决了传统开关DC-DC变换器在脉冲宽度调制(pules width modulation,PWM)信号占空比大于0.5时的斜波补偿导致芯片带载能力下降的缺陷;同时,芯片设计了新颖的峰值电流检测电路,有效减小了芯片面积,提高芯片的转换效率.The power consumption for portable electronic devices is very large,that will reduce the battery life.Here we designed a high load capacity,high efficiency current mode pules width modulation（PWM） step-up mode DC-DC convertor control chip.Through the use of a piecewise linear ramp compensation technique,we can increase it′s carrying capacity,conquering the defect of decreasing the chip′s carrying capacity of a traditional switching DC-DC convertor.The defect is caused by the slope compensation when PWM signal duty cycle is greater than 50%;Meanwhile,we proposed a novel peak current detection circuit,effectively reducing the chip area and improving the chip efficiency.

关 键 词：开关电源 DC-DC变换器 斜波补偿 

分 类 号：TN386.1[电子电信—物理电子学]