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.
出处
《固体电子学研究与进展》
CAS
CSCD
北大核心
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)
