{"title":"宽负载PWM/PFM DC-DC降压变换器开关尺寸控制电路","authors":"B. Yuan, X. Lai, Jun Wang, Yao Huang, Xiuzhi Wu","doi":"10.1109/ISICIR.2016.7829740","DOIUrl":null,"url":null,"abstract":"A switch size control circuit for voltage-mode DC-DC buck converter is presented. By detecting the average load current, the circuit not only achieves hybrid mode of PWM and PFM operation, but also changes the power switch size according to the load conditions. Both the high-side and low-side switch currents are fully sensed by detecting the filtered smooth voltage of the switch node. The generated digital signal maintains a substantially constant mode and switch size changing point. A monolithic DC-DC buck converter using the proposed circuit has been fabricated with a 0.5µm CMOS process for validation. The switch size is 1/3 of the maximum value in PFM operation and changes to full size in PWM operation. High efficiency over a wide load current from 0.001 to 5A is achieved. The measurement result shows that the switch size control circuit has good performance and agrees well with the theoretical analysis.","PeriodicalId":159343,"journal":{"name":"2016 International Symposium on Integrated Circuits (ISIC)","volume":"192 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":"{\"title\":\"Switch size control circuit in wide-load PWM/PFM DC-DC buck converters\",\"authors\":\"B. Yuan, X. Lai, Jun Wang, Yao Huang, Xiuzhi Wu\",\"doi\":\"10.1109/ISICIR.2016.7829740\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A switch size control circuit for voltage-mode DC-DC buck converter is presented. By detecting the average load current, the circuit not only achieves hybrid mode of PWM and PFM operation, but also changes the power switch size according to the load conditions. Both the high-side and low-side switch currents are fully sensed by detecting the filtered smooth voltage of the switch node. The generated digital signal maintains a substantially constant mode and switch size changing point. A monolithic DC-DC buck converter using the proposed circuit has been fabricated with a 0.5µm CMOS process for validation. The switch size is 1/3 of the maximum value in PFM operation and changes to full size in PWM operation. High efficiency over a wide load current from 0.001 to 5A is achieved. The measurement result shows that the switch size control circuit has good performance and agrees well with the theoretical analysis.\",\"PeriodicalId\":159343,\"journal\":{\"name\":\"2016 International Symposium on Integrated Circuits (ISIC)\",\"volume\":\"192 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2016-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"5\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2016 International Symposium on Integrated Circuits (ISIC)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/ISICIR.2016.7829740\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2016 International Symposium on Integrated Circuits (ISIC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ISICIR.2016.7829740","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Switch size control circuit in wide-load PWM/PFM DC-DC buck converters
A switch size control circuit for voltage-mode DC-DC buck converter is presented. By detecting the average load current, the circuit not only achieves hybrid mode of PWM and PFM operation, but also changes the power switch size according to the load conditions. Both the high-side and low-side switch currents are fully sensed by detecting the filtered smooth voltage of the switch node. The generated digital signal maintains a substantially constant mode and switch size changing point. A monolithic DC-DC buck converter using the proposed circuit has been fabricated with a 0.5µm CMOS process for validation. The switch size is 1/3 of the maximum value in PFM operation and changes to full size in PWM operation. High efficiency over a wide load current from 0.001 to 5A is achieved. The measurement result shows that the switch size control circuit has good performance and agrees well with the theoretical analysis.
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