参数资料
型号: PMC4118LWS/C
厂商: ERICSSON POWER MODULES AB
元件分类: 电源模块
英文描述: 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE
封装: ROHS COMPLIANT, PACKAGE-6
文件页数: 21/31页
文件大小: 1603K
代理商: PMC4118LWS/C
EN/LZT146056R4A EricssonPowerModules,March2007
PMC4318TWSDatasheet
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.1.67W×9°C/W=15°C
C.115°C-15°C=maxambienttemperatureis100°C
Therealtemperaturewillbedependentonseveralfactors,
likePCBsizeandtype,directionofairflow,airturbulence
etc.Itisrecommendedtoverifythetemperaturebytesting.
A.((1/0.915)-1)×18W=1.67W
Tref
ThePMC4000thermaltestingisperformedwiththe
productmountedonanFR4board254× 254 mm with 8
× 254 mm with 8
254mmwith8
layersof
35mcopper.
AIRFLOW
(max115°C)
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