参数资料
型号: PMC4510WS
厂商: ERICSSON POWER MODULES AB
元件分类: 电源模块
英文描述: 1-OUTPUT 52.8 W DC-DC REG PWR SUPPLY MODULE
封装: ROHS COMPLIANT, PACKAGE-6
文件页数: 21/31页
文件大小: 1655K
代理商: PMC4510WS
EN/LZT146055R4A EricssonPowerModules,March2007
PMC4518TWSDatasheet
Thermal Considerations
General
ThePMC4000SeriesDC/DCregulatorsaredesigned
tooperateinavarietyofthermalenvironments,however
sufficientcoolingshouldbeprovidedtohelpensurereliable
operation.Heatisremovedbyconduction,convectionand
radiationtothesurroundingenvironment.Increasedairflow
enhancestheheattransferviaconvection.
Propercoolingcanbeverifiedbymeasuringthe
temperatureatthereferencepoint(Tref).
Calculation of ambient temperature
Byusingthethermalresistancethemaximumallowed
ambienttemperaturecanbecalculated.
A.Thepowerlossiscalculatedbyusingtheformula
((1/
η)-1)×outputpower=powerlosses.
η=efficiencyofregulator.Example:95%=0.95
B.FindthevalueofthethermalresistanceRthTref-Ainthedia-
grambyusingtheairflowspeedatthemodule.Takethether-
malresistance×powerlosstogetthetemperatureincrease.
Thermalresistancevs.airspeedmeasuredattheregulator.
C.Maxallowedcalculatedambienttemperatureis:
MaxTrefofDC/DCregulator-temperatureincrease.
Example:1.8Voutputat1m/s,fullload,3.3Vin:
B.2.7W×7.5°C/W=20.3°C
C.115°C-20.3°C=maxambienttemperatureis94.7°C
Therealtemperaturewillbedependentonseveralfactors,
likePCBsizeandtype,directionofairflow,airturbulence
etc.Itisrecommendedtoverifythetemperaturebytesting.
A.((1/0.915)-1)×28.8W=2.7W
Tref
ThePMC4000thermaltestingisperformedwiththe
productmountedonanFR4board254× 254 mm with 8
× 254 mm with 8
254mmwith8
layersof35mcopper.
AIRFLOW
(max115°C)
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