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一般性判定方法,仅计算Conductionloss,不考虑switchinglossJudgepass:TmosfetTjCASETEMPERATURETcMOSFETDRAINCURRENT(RMS)IDSTATICDRAIN-SOURCEONRESISTANCERDSTHERMALRESISTANCEJUNCTION-CASEMAXRθjcTHERMALRESISTANCEJUNCTION-AMBIENTMAXRθjaPOWERENVIRONMENTTALOPERATIONTEMPERATURERANGEMAXTA(MAX)TESTAMBIENTTEMPERATURETAMOSFETOPERATINGJUNCTIONTEMPERATURETjTMOSFET=TA+ID^2*RDS(ON)*Rθja+TA(MAX)-TA(粗略节温度)TMOSFETTMOSFET=TC+ID^2*RDS(ON)*Rθjc+TA(MAX)-TA(粗略节温度)TMOSFETTCASE=TMOSFET-ID^2*RDS(ON)*RθjaTCASEUnitIRF540NFUnit100℃℃28AA0.077Ω0.077Ω1℃/W6262℃/W25℃25℃3767.8℃0160.37℃0160.37℃
本文标题:MOSFET温升计算工具
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