提高峰值电流模DC/DC带载能力的限流设计  

Design of peak current limitation for improving load ability in peak current mode DC/DC converters

作　　者：代国定[1,2] 胡波[1] 马晓辉[1] 陈跃[1] 

机构地区：[1]西安电子科技大学电路CAD研究所,陕西西安710071 [2]西安电子科技大学超高速电路设计与电磁兼容教育部重点实验室,陕西西安710071

出　　处：《华中科技大学学报（自然科学版）》2011年第4期29-32,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家部委预研基金资助项目(9140A08010208DZ0123)

摘　　要：提出了一种新颖的提高峰值电流模DC/DC带载能力的限流设计,将斜坡补偿的采样电流放大信号与斜坡补偿的正温度系数电压信号相比较,代替传统的固定电压限流,消除斜坡补偿对带载能力的影响,并对采样结构的正温度特性进行温度补偿,提高了DC/DC转换器带载能力.该电路基于TSMC的0.25μm BCD工艺设计,投片测试结果表明:占空比在10%～80%变化时,电感电流最大值相对变化量小于5%;温度在-40～120℃变化时,电感电流最大值相对变化量小于6.5%.A novel design of peak current limitation for improving load ability in peak current mode direct current/direct current （DC/DC） converters was presented. The amplified signal of the sense current with slope compensation was compared with a positive temperature coefficient voltage with the same slope compensation to eliminate the conventional fixed voltage current limit, which reduced the slope compensation effect on the load ability and made a temperature compensation for the current sense structure. Thus, the load ability was improved significantly. Based on taiwan semiconductor manufacturing compang （TSMC） 0.25 μm bipolar transistor/complementary metal oxide semiconductor/double diffusion metal oxide semiconductor （BCD） process, the circuit was designed and implemented in peak current mode DC/DC converter. Silicon test results show that the relative variation of max inductor current is less than 5% with a duty cycle ranging from 10% to 80%, and the relative variation of max inductor current is less than 6.5% with a temperature ranging from -40～120 ℃

关 键 词：DC/DC转换器 斜坡补偿 带载能力 峰值电流模 限流比较器 温度补偿 

分 类 号：TN432[电子电信—微电子学与固体电子学]