參數(shù)資料
型號： PMB4219WPP/B
廠商： ERICSSON POWER MODULES AB
元件分類： 電源模塊
英文描述： 1-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE
封裝： ROHS COMPLIANT, PACKAGE-10
文件頁數(shù)： 20/29頁
文件大?。?/td> 1387K
代理商： PMB4219WPP/B
EN/LZT146048R4A EricssonPowerModules,March2007
PMB4418TWPDatasheet
Thermal Considerations
General
ThePMB4000SeriesDC/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:5Vinput,1.8Voutputat1m/s,fullload:
B.2W×9°C/W=18°C
C.115°C-18°C=maxambienttemperatureis97°C
Therealtemperaturewillbedependentonseveralfactors,
likePCBsizeandtype,directionofairflow,airturbulence
etc.Itisrecommendedtoverifythetemperaturebytesting.
A.((1/0.9)-1)×18W=2W
ThePMB4000thermaltestingisperformedwiththe
productmountedonanFR4board254× 254 mm with 8
× 254 mm with 8
254mmwith8
layersof
35m copper. Airflow is perpendicular to the T
m copper. Airflow is perpendicular to the T
mcopper.AirflowisperpendiculartotheTrefside.
25
m
[1
in
.]
airflow
Test board
choke
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PMB4218GWPP/B 1-OUTPUT 28.8 W DC-DC REG PWR SUPPLY MODULE
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