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参数资料
| 型号： | PMB8218GP |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-10 |
| 文件页数： | 24/32页 |
| 文件大小： | 1551K |
| 代理商： | PMB8218GP |
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EN/LZT146066R2A EricssonPowerModules,April2007
PMB8818TPDatasheet
Thermal Considerations
General
ThePMB8000SeriesDC/DCregulatorsaredesigned
tooperateinavarietyofthermalenvironments,however
sufficientcoolingshouldbeprovidedtohelpensurereliable
operation.Heatisremovedbyconduction,convectionand
radiationtothesurroundingenvironment.Increasedairflow
enhancestheheattransferviaconvection.Propercooling
canbeverifiedbymeasuringthetemperature
atthereferencepoint(Tref).
1
Tref
ThePMB8000thermaltestingisperformedwiththe
productmountedonanFR4board254 254 mm with 8
254 mm with 8
254mmwith8
layersof35
mmcopper.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.5.11W7.2°C/W=36.8°C
C.115°C-36.8°C=maxambienttemperatureis78.2°C
Therealtemperaturewillbedependentonseveralfactors,
likePCBsizeandtype,directionofairflow,airturbulence
etc.Itisrecommendedtoverifythetemperaturebytesting.
A.(()-1)80W=5.11W
1
0.94
E.g V output at 1 m/s, full load, 1 V in:
Thermalresistancevs.airspeedmeasuredattheregulator.
ThePMB8000seriesregulatorcanacceptupto8mFof
capacitiveloadontheoutputatfullload.Thisgives<500
mF/AofIO.Whenusingthatlargecapacitanceitisimportant
toconsidertheselectionofoutputcapacitors;theresulting
behaviorisacombinationoftheamountofcapacitanceand
ESR.
AcombinationoflowESRandoutputcapacitance
exceeding8mFforPMB8818cancausetheregulatorinto
overcurrentprotectionmode(hick-up)duetohighstartup
current.Theoutputfiltermustthereforebedesignedwithout
exceedingtheabovestatedcapacitancelevelsiftheESRis
lowerthen
30-40m
.
Parallel Operation
ThePMB8000SeriesDC/DCregulatorscanbeconnected
inparallelwithacommoninput.Parallelingisaccomplished
byconnectingtheoutputvoltagepinsdirectlyandusing
aloadsharingdeviceontheinput.Layoutconsiderations
shouldbemadetoavoidloadimbalance.Formoredetails
onparalleling,pleaseconsultyourlocalapplicationssupport.
(max115°C)
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