摘要
基于提高模拟控制电流模式Buck型DC-DC芯片效率的目的,通过对一款2.5 A电流模式Buck型DC-DC的功率管损耗模型进行分析,提出了一种根据负载电流不同而产生不同控制信号来控制振荡器充电电流大小的方法,从而实现振荡器频率切换进而提升效率。该电路主要由误差放大器、比较器和梯形波产生电路等构成,在CSMC 0.25BCD高压工艺库下,使用spectre完成电路设计与仿真验证,结果表明,在小于500 mA负载电流时,效率提升最高达10%;在500 mA至1.5 A负载电流时,效率提升最高达2%;在1.5 A至2.5 A负载电流时,效率提升最高达0.5%。
Based on the purpose of improving the efficiency of the analog control current mode Buck DCDC chip,this paper analyzes a 2.5 A current mode Buck DC-DC power tube loss model,and proposes a different control according to the different load currents. The signal is used to control the charging current of the oscillator,so as to realize the frequency switching of the oscillator to improve efficiency. The circuit is mainly composed of an error amplifier,a comparator,and a trapezoidal wave generating circuit.Under the CSMC 0.25BCD high voltage process library,spectre is used to complete the circuit design and simulation verification. The results show that the efficiency improvement is as high as when the load current is less than 500 mA 10%;when the load current is 500 mA to 1.5 A,the efficiency increase is up to 2%;when the load current is 1.5 A to 2.5 A,the efficiency increase is up to 0.5%.
作者
赵鹏
ZHAO Peng(School of Information Engineering,Yulin University,Yulin 719000,China)
出处
《电子设计工程》
2022年第9期144-148,共5页
Electronic Design Engineering
基金
陕西省教育厅科学研究计划项目(21JK1006)。
