參數(shù)資料
型號: PKJ4719EPIP
廠商: ERICSSON POWER MODULES AB
元件分類: 電源模塊
英文描述: 1-OUTPUT 75 W DC-DC REG PWR SUPPLY MODULE
封裝: ROHS COMPLIANT PACKAGE-9
文件頁數(shù): 21/30頁
文件大?。?/td> 1870K
代理商: PKJ4719EPIP
8
PKJ4000EPIEN/LZT146025R8AEricssonPowerModules,June2007
Thermal Consideration
Position
Device
Tcritical
RecommendedMaxValue
P1
FR4PWB
Tsurface
125C
P2
Transformer
Tcore
125C
P2
P1
Airflow
General
ThePKJ4000ESeriesDC/DCconvertersaredesigned
tooperateinavarietyofthermalenvironments,however
sufficientcoolingshouldbeprovidedtohelpensurereliable
operation.Heatisremovedbyconduction,convectionand
radiationtothesurroundingenvironment.Increasedairflow
enhancestheheattransferviaconvection.Theavailable
loadcurrentvs.ambientairtemperatureandairflowat
Vin=53Vforeachmodelisaccordingtotheinformation
givenundertheoutputsection.Thetestisdoneinawind
tunnelwithacrosssectionof305x305mm,theDC/DC
converterverticallymountedona8layerPCBwithasize
of254x254mm.Eachlayerwith35m(1oz)copper.Proper
coolingcanbeverifiedbymeasuringthetemperatureof
selecteddevices.Peaktemperaturecanoccuratposition
P1andP2.Thetemperatureatthesepositionsshouldnot
exceedtherecommendedmaxvalues.
Calculation of ambient temperature
Byusingthethermalresistancethemaximumallowed
ambienttemperaturecanbecalculated.
1.Thepowerlossiscalculatedbyusingtheformula
((1/
η)-1)×outputpower=powerlosses.
η=efficiencyofconverter.E.g89%=0.89
2.Findthevalueofthethermalresistanceforeachproductin
thediagrambyusingtheairflowspeedattheoutputsection
oftheconverter.Takethethermalresistancexpowerlossto
getthetemperatureincrease.
3.Maxallowedcalculatedambienttemperatureis:Max
TPCBofDC/DCconverter–temperatureincrease.
B.10.2W×5.1°C/W=52°C
C.125°C-52°C=maxambienttemperatureis73°C
Therealtemperaturewillbedependentonseveralfactors,
likePCBsizeandtype,directionofairflow,airturbulence
etc.Itisrecommendedtoverifythetemperaturebytesting.
A.(()-1)×82.5W=10.2W
1
0.89
E.gPKJ4810EPIat1m/s:
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