电流模降压DC-DC大负载低漏失工作研究  

The Research on Low Dropout Operation of Current-mode DC-DC Buck Converters with Heavy Loads

作　　者：袁冰[1,2] 来新泉[1] 叶强[1] 靳钊[2] 李演明[2] 贾新章[2] 

机构地区：[1]西安电子科技大学电路CAD所,西安710071 [2]西安电子科技大学微电子学院,西安710071

出　　处：《固体电子学研究与进展》2009年第3期429-433,共5页Research & Progress of SSE

基　　金：国家部委重点预研资助(D112006067);教育部超高速电路与电磁兼容重点实验室专项资助(YZCB2008009)

摘　　要：对线性斜坡补偿与芯片峰值电流和带载的关系进行了论证,针对大负载低漏失工作,在分段线性斜坡补偿的基础上,提出了电流抵消电路,得到在箝位状态可调节的斜坡电流,延长了电池的使用寿命,利于便携式应用。电路紧凑简洁,易于实现,并在一款额定带载600mA的电流模降压DC-DC变换器中进行了验证,测试结果表明,达到了100%占空比时输出电压2.5V以及3.3V的600mA大负载低漏失工作。The linear slope compensation effect on peak current and load capability of DC-DC converter is proven in this paper.In order to solve the problem of low dropout operation with heavy loads,the circuit for counteracting part of the slope current is proposed on the basis of piecewise linear slope compensation.And adjustable slope current and low dropout operation are achieved during clamp state,which extends the battery life and suits for portable applications.The circuit is concise,simple to implement and has been fabricated in a current-mode DC-DC buck converter with 600mA load current for validation. Experimental results show that the low dropout operation with 600 mA load current and output voltage of 2.5 V and 3.3 V at duty cycle of 100M is realized.

关 键 词：DC-DC变换器 电流模控制 低漏失工作 斜坡补偿 带载能力 

分 类 号：TN432[电子电信—微电子学与固体电子学]