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參數(shù)資料
| 型號(hào)： | PMB4118LAWP/B |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 19.2 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： | PMB4118LAWP/B |
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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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PMB4218GWP/B | 1-OUTPUT 28.8 W DC-DC REG PWR SUPPLY MODULE |
| PMB4510WPP | 1-OUTPUT 52.8 W DC-DC REG PWR SUPPLY MODULE |
| PMB4218HWPP/B | 1-OUTPUT 24 W DC-DC REG PWR SUPPLY MODULE |
| PMB4218HWP | 1-OUTPUT 24 W DC-DC REG PWR SUPPLY MODULE |
| PMB4118LAWPP/B | 1-OUTPUT 19.2 W DC-DC REG PWR SUPPLY MODULE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PMB4118LWPM | 制造商:Ericsson 功能描述:POL DOSA COMPATIBLE 12V 10A |
| PMB4118NAWP | 制造商:Ericsson 功能描述:- Trays |
| PMB4118NWP | 制造商:Ericsson 功能描述:- Trays |
| PMB4219WPM | 制造商:Ericsson 功能描述:POL DOSA COMPATIBLE |
| PMB4310TP | 制造商:Ericsson 功能描述:NON-ISOLATED, THRU-HOLE, REGULATOR - Bulk |
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