Transcription of Minimizing Ringing at the Switch Node of a Boost Converter
{{id}} {{{paragraph}}}
Example: biology
Minimizing Ringing at the Switch Node of a Boost Converter
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 . INIT+12pLSPAR#CSPAR# (1)LSPAR#+1 CADD3 2p INIT 2(2)RSNUB+LSPAR#CADD3 (3) ,thetotalcircuitcapacitance[C PAR#+CADD]isnow4timesitsoriginalvalue[or C PAR#=CADD/3].
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 converter on a 5-ns/divtime scale.
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: