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參數(shù)資料
| 型號： | PMB8118LPN |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, PACKAGE-10 |
| 文件頁數(shù)： | 24/32頁 |
| 文件大?。?/td> | 1554K |
| 代理商： | PMB8118LPN |
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EN/LZT146065R2A EricssonPowerModules,April2007
PMB8518TPDatasheet
Thermal Considerations
General
ThePMB8000SeriesDC/DCregulatorsaredesigned
tooperateinavarietyofthermalenvironments,however
sufficientcoolingshouldbeprovidedtohelpensurereliable
operation.Heatisremovedbyconduction,convectionand
radiationtothesurroundingenvironment.Increasedairflow
enhancestheheattransferviaconvection.
Propercoolingcanbeverifiedbymeasuringthe
temperatureatthereferencepoint(Tref).
1
Tref
ThePMB8000thermaltestingisperformedwiththe
productmountedonanFR4board254x 254 mm with 8
x254 mm with 8
254mmwith8
layersof35
mcopper.AirflowisperpendiculartotheTref
side.
25
m
[1
in
.]
airflow
Test board
choke
Calculation of ambient temperature
Byusingthethermalresistancethemaximumallowed
ambienttemperaturecanbecalculated.
1. Thepowerlossiscalculatedbyusingtheformula
((1/
η)-1)×outputpower=powerlosses.
η=efficiencyofconverter.E.g88%=0.88
2. Findthevalueofthethermalresistanceforeachproduct
inthediagrambyusingtheairflowspeedattheoutput
sectionoftheconverter.Takethethermalresistancex
powerlosstogetthetemperatureincrease.
3. Maxallowedcalculatedambienttemperatureis:Max
TrefofDC/DCregulator–temperatureincrease.
B.3.19W×12.2°C/W=38.9°C
C.115°C-38.9°C=maxambienttemperatureis76.1°C
Therealtemperaturewillbedependentonseveralfactors,
likePCBsizeandtype,directionofairflow,airturbulence
etc.Itisrecommendedtoverifythetemperaturebytesting.
A.(()-1)×50W=3.19W
1
0.94
E.g V output at 1 m/s, full load, 1 V in:
Thermalresistancevs.airspeedmeasuredattheregulator.
ThePMB8000seriesregulatorcanacceptupto5mFof
capacitiveloadontheoutputatfullload.Thisgives<500
F/AofIO.Whenusingthatlargecapacitanceitisimportant
toconsidertheselectionofoutputcapacitors;theresulting
behaviorisacombinationoftheamountofcapacitanceand
ESR.
AcombinationoflowESRandoutputcapacitance
exceeding5mFforPMB8518cancausetheregulatorinto
overcurrentprotectionmode(hick-up)duetohighstartup
current.Theoutputfiltermustthereforebedesignedwithout
exceedingtheabovestatedcapacitancelevelsiftheESRis
lowerthen30-40m
.
Parallel Operation
ThePMB8000SeriesDC/DCregulatorscanbeconnected
inparallelwithacommoninput.Parallelingisaccomplished
byconnectingtheoutputvoltagepinsdirectlyandusing
aloadsharingdeviceontheinput.Layoutconsiderations
shouldbemadetoavoidloadimbalance.Formoredetails
onparalleling,pleaseconsultyourlocalapplicationssup-
port.
(max115°C)
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