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參數(shù)資料
| 型號： | PMB4218GWP |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 28.8 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> | 1528K |
| 代理商： | PMB4218GWP |
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EN/LZT146049R4A EricssonPowerModules,March2007
PMB4518TWPDatasheet
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.3.2W×9°C/W=28.8°C
C.90°C-28.8°C=maxambienttemperatureis61.2°C
Therealtemperaturewillbedependentonseveralfactors,
likePCBsizeandtype,directionofairflow,airturbulence
etc.Itisrecommendedtoverifythetemperaturebytesting.
A.((1/0.9)-1)×28.8W=3.2W
ThePMB4000thermaltestingisperformedwiththe
productmountedonanFR4board254× 254 mm with 8
× 254 mm with 8
254mmwith8
layersof35m copper. Airflow is perpendicular to the T
m copper. Airflow is perpendicular to the T
mcopper.AirflowisperpendiculartotheTref
side.
25
m
[1
in
.]
airflow
Test board
choke
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