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SJSU EE 136 - Loop Compensation of MIC2204

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Loop Compensation of MIC2204WHAT IS MIC 2204?MIC2204 Block DiagramStable_Unstable_SystemHow to Make an Unstable System, Stable.Problems of Making a Voltage_Mode_Buck_Converter StableRemediesWhenever two different paths will lead to the same point, then we will have zeroes.Compensation Configuration in MIC2204Structure of Error AmplifierZero AmplifierOverall StabilitySlide 13ReferencesSlide 15Loop Compensation of Loop Compensation of MIC2204MIC2204Behzad MohtashemiBehzad MohtashemiEE 136 Power ElectronicsEE 136 Power ElectronicsProfessor Zhou Ph.D.Professor Zhou Ph.D.WHAT IS MIC 2204?WHAT IS MIC 2204?It is a high-efficiency 2MHz Synchronous Buck It is a high-efficiency 2MHz Synchronous Buck Converter. >95% efficiencyConverter. >95% efficiencyInput voltage range: 2.3V to 5.5VInput voltage range: 2.3V to 5.5VOutput down to 1V/600mAOutput down to 1V/600mAIt has ultra-fast transient response (typical It has ultra-fast transient response (typical 200kHz GBW)200kHz GBW)Internal CompensationInternal CompensationAll ceramic capacitors ( No ESR ). difficult to All ceramic capacitors ( No ESR ). difficult to compensatecompensateMIC2204 Block DiagramMIC2204 Block DiagramStable_Unstable_SystemStable_Unstable_SystemHow to Make an Unstable System, How to Make an Unstable System, Stable.Stable.Problems of Making a Problems of Making a Voltage_Mode_Buck_ConverVoltage_Mode_Buck_Converter Stableter StableRemediesRemediesClose the loop before the resonant frequency, but this Close the loop before the resonant frequency, but this will result in a very slow transient response.will result in a very slow transient response.Use an output capacitor with a small ESR, such Use an output capacitor with a small ESR, such Y5_ceramic capacitors.Y5_ceramic capacitors.Add zeroes into your loop system, by using typeII Add zeroes into your loop system, by using typeII and typeIII amplifiers. and typeIII amplifiers. MIC2204 uses a zero amplifier to introduce the final MIC2204 uses a zero amplifier to introduce the final zero into the system. The first pole and zero come zero into the system. The first pole and zero come from the error amplifier itself.from the error amplifier itself.Whenever two different Whenever two different paths will lead to the same paths will lead to the same point, then we will have point, then we will have zeroes.zeroes.Compensation Compensation Configuration in MIC2204Configuration in MIC2204Structure of Error Structure of Error AmplifierAmplifierZero AmplifierZero AmplifierIt is simple unity gain amplifierIt is simple unity gain amplifierIt only needs to create an alternate path to the It only needs to create an alternate path to the outputoutputIt needs no internal compensationsIt needs no internal compensationsBy creating an alternate path, then it will boost By creating an alternate path, then it will boost both gain and phase both gain and phaseOverall StabilityOverall StabilityOverall StabilityOverall StabilityReferencesReferencesH. Dean Venable, The K factor: A new H. Dean Venable, The K factor: A new mathematical tool for stability analysis and mathematical tool for stability analysis and synthesis, synthesis, Powerc onPowerc on, 10 , H1-H12 (1983), 10 , H1-H12 (1983)Thomas V. Papathomos, On the stability of Thomas V. Papathomos, On the stability of peak current-controlled converters: Analysis, peak current-controlled converters: Analysis, simulation, and experiments, IEEE simulation, and experiments, IEEE Transaction on Industrial Electronics, IE-Transaction on Industrial Electronics, IE-33(2), 176-184 (1986)33(2), 176-184 (1986)J. Kassakian, M. Schlecht, and G. Verghese, J. Kassakian, M. Schlecht, and G. Verghese, Principles of Power Electronics. Reading, MA: Principles of Power Electronics. Reading, MA: Addison Wesley, 1992Addison Wesley, 1992Overall StabilityOverall


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SJSU EE 136 - Loop Compensation of MIC2204

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