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dc.contributor.advisorSanchez-Sinencio, Edgar
dc.creatorVarghese, Francy
dc.date.accessioned2017-08-21T14:28:51Z
dc.date.available2017-08-21T14:28:51Z
dc.date.created2015-05
dc.date.issued2015-04-20
dc.date.submittedMay 2015
dc.identifier.urihttp://hdl.handle.net/1969.1/161256
dc.description.abstractDual mode DC-DC converters utilizing PWM and PFM modes of operation have been widely used to improve the efficiency over a wide range of the load current. Due to the highly varying nature of the load, it is beneficial to have the converter switch between the modes without an external mode select signal. This work proposes a new technique for automatic mode switching which maintains very high efficiency at light loads and at the same time, keeps the output well regulated during a load transient from sleep to the active state. The Constant On-time PFM scheme and a zero current detector avoids the use of an accurate current sensing block. The power supply rejection is also improved using feed-forward paths from the supply in both the PWM and PFM modes. A new implementation of the PWM controller with clamped error voltage required to meet the specifications is also shown. The proposed feedback implementation using a programmable current source and resistance provides smooth output programming.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.subjectPWM (Pulse-Width Modulation)
dc.subjectPFM (Pulse-Frequency Modulation)
dc.subjectDual mode converter
dc.subjectlight load efficiency
dc.subjectAutomatic mode transition
dc.subjectZCD (Zero Current Detector)
dc.titleA Fast Response Dual Mode Buck Converter with Automatic Mode Transition
dc.typeThesis
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.disciplineElectrical Engineering
thesis.degree.grantorTexas A & M University
thesis.degree.nameMaster of Science
thesis.degree.levelMasters
dc.contributor.committeeMemberLi, Peng
dc.contributor.committeeMemberHu, Jiang
dc.contributor.committeeMemberFink, Rainer
dc.type.materialtext
dc.date.updated2017-08-21T14:28:51Z
local.etdauthor.orcid0000-0003-4533-8825


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