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參數(shù)資料
| 型號： | BWR-15/575-D24A-C |
| 廠商： | MURATA POWER SOLUTIONS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 2-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, SMT-6/5 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 450K |
| 代理商： | BWR-15/575-D24A-C |
1 5 - 1 7 W , D U A L O U T P U T D C / D C C O N V E R T E R S
A Series
5
On/Off Control
Theinput-side,remoteOn/OffControlfunction(pin3)canbeorderedto
operatewitheitherpolarity.Positive-polaritydevices("C"suffix)areenabled
whenpin3isleftopen(orispulledhigh,+13VtoVINappliedwithrespectto
–Input,pin2,seeFigure2).Positive-polaritydevicesaredisabledwhenpin
3ispulledlow(0-0.8Vwithrespectto–Input).Negative-polaritydevicesare
offwhenpin3isleftopen(orpulledhigh,3.5VtoVIN),andonwhenpin3is
pulledlow(0-0.5V).SeeFigure5.
Dynamiccontroloftheremoteon/offfunctionisbestaccomplishedwith
amechanicalrelayoranopen-collector/open-draindrivecircuit(optically
isolatedifappropriate).Thedrivecircuitshouldbeabletosinkappropriate
current(seePerformanceSpecs)whenactivatedandwithstandappropriate
voltagewhendeactivated.
Applyinganexternalvoltagetopin3whennoinputpowerisappliedtothe
convertercancausepermanentdamagetotheconverter.
3
2
1
+INPUT
13V CIRCUIT
5V CIRCUIT
–INPUT
ON/OFF
CONTROL
Figure 4. Driving the Positive Polarity On/Off Control Pin
Figure 5. Driving the Negative Polarity On/Off Control Pin
Start-Up Time
TheVINtoVOUTstart-uptimeistheintervaloftimewheretheinputvoltage
crossestheturn-onthresholdpoint,andthefullyloadedoutputvoltage
entersandremainswithinitsspecifiedaccuracyband.Actualmeasured
timeswillvarywithexternaloutputcapacitanceandload.TheBWR15-17W
Seriesimplementsasoftstartcircuitthatlimitsthedutycycle
ofthePWMcontrolleratpowerup,therebylimitingtheInputInrushcurrent.
TheOn/OffControltoVOUTstart-uptimeassumestheconverterhasits
nominalinputvoltageappliedbutisturnedoffviatheOn/OffControlpin.The
specificationdefinestheintervalbetweenthetimeatwhichtheconverteris
turnedonandthefullyloadedoutputvoltageentersandremainswithinits
specifiedaccuracyband.SimilartotheVINtoVOUTstart-up,theOn/OffCon-
troltoVOUTstart-uptimeisalsogovernedbytheinternalsoftstartcircuitry
Ifloadingfrom+/–OutputstoOutputReturnissymmetrical,thevoltage
atOutputpinswithrespecttoOutputReturnwillalsobesymmetrical.An
unbalanceinloadingwillconsequentlyresultinadegradedVOUTregulation
accuracyfrom+/–OutputstoOutputReturn(–Outputto+Outputregulation
willstillbewithinspecification)withaloadstepfromminimumtomaximum
loadandwiththeotheroutputatfullload,themaximumdeviationis2.5%
VOUTnominal.
3
2
1
+INPUT
–INPUT
ON/OFF
CONTROL
15.5
15.4
15.3
15.2
15.1
15
14.9
14.8
14.7
BWR-15/575-D48A Unbalanced Output Load Regulation
Output Load Regulation (%)
+/
–1
5V
O
U
T
0
10
20
30
40
50
60
70
80
90
100
+15V@ 0A to 0.575A
–15V@ 0.575A
–15V@ 0A to 0.575A
+15V@ 0.575A
Current Limiting
Whenoutputcurrentincreasestoapproximately15%to50%abovetherated
outputcurrent,theDC/DCconverterwillgointoacurrentlimitingmode.In
thisconditiontheoutputvoltagewilldecreaseproportionatelywithincreases
inoutputcurrent,therebymaintainingasomewhatconstantpowerdissipa-
tion.Thisiscommonlyreferredtoaspowerlimiting.Currentlimitinception
isdefinedasthepointwherethefull-poweroutputvoltagefallsbelowthe
specifiedtolerance.SeePerformance/FunctionalSpecifications.Iftheload
currentbeingdrawnfromtheconverterissignificantenough,theunitwillgo
intoashortcircuitcondition.See"ShortCircuitCondition."
Short Circuit Condition
Whenaconverterisincurrentlimitmodetheoutputvoltageswilldropas
theoutputcurrentdemandincreases.Iftheoutputvoltagedropstoolow,the
magneticallycoupledvoltageusedtodevelopprimarysidevoltageswillalso
drop,therebyshuttingdownthePWMcontroller.
Followingatime-outperiod,thePWMwillrestart,causingtheoutputvoltages
tobeginrampingtotheirappropriatevalues.Iftheshort-circuitcondition
persists,anothershutdowncyclewillbeinitiated.Thison/offcyclingis
referredtoas"hiccup"mode.Thehiccupcyclingreducestheaverageoutput
current,therebypreventinginternaltemperaturesfromrisingtoexcessive
levels.TheBWR15-17WSeriesiscapableofenduringanindefiniteshort
circuitoutputcondition.
Thermal Shutdown
TheseBWRconvertersareequippedwithThermalShutdownCircuitry.If
environmentalconditionscausetheinternaltemperatureoftheDC/DCcon-
verterrisesabovethedesignedoperatingtemperature,aprecisiontempera-
turesensorwillpowerdowntheunit.Whentheinternaltemperature
Figure 4. Output Voltage Accuracy vs. Imbalanced Loading
www.cd4power.com
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