Transcription of Minimizing Ringing at the Switch Node of a Boost …
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Minimizing Ringing at the Switch Node of a Boost …
1 DescriptionoftheProblemControlLPAR3 LPAR4 COUTCOUT-BYPCINVINVOUTPARC-D1L1D1 CriticalLoopPower GND Pointor PlaneCPAR-Q1Q1 LPAR1 RSNUBCSNUBLPAR5 LPAR2 SWNodeApplicationReportSLVA255 scriticalloopcreatedbytheparasiticinduct ancesandcapacitances, + , ,theconductedemissionsand/orelectromagne ticinterference(EMI) ,approximatelytwicetheexpected200-MHzrin gingfrequency, ,thepeakvoltageattheswitchnodeshouldbeno morethanVOUT+VDIODE , , ,thedesignershouldselectFETsanddiodeswit hminimalparasiticcapacitancesandthenlayo uttheboardtominimizethedistancebetweenbo thswitchesandtheinductor, , ' [COUT-BYP]betweentheoutput( F F) #,LPAR1,LPAR2, ,asnubbercircuit, 'sparasiticinductance, ,fINIT=217 MHz,causedbytheparasiticinductance[L PAR#]andparasiticcapacitance[C PAR#]fromthescopeplotinFigure2,addenough capacitance[CADD]fromtheswitchnodetogrou ndtoreducetheringingfrequencyby.
www .ti.com Description of the Problem Figure 2. Ringing at Switch Node of Boost Converter Figure 2 shows a scope plot of the switch node of a boost …
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