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PQ60025ETL35NYS Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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PQ60025ETL35NYS Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 13 page  Product # PQ60025ETL35 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2ET625F Rev. B 5/28/08 Page 9 Technical Specification Input: Output: Current: Package: 35V – 75 V 2.5 V 35 A Eighth-brick BASICOPERATIONANDFEATURES Thesinglestagepowerconverterswitchesatafixedfre- quencyforpredictableEMIperformance.Rectificationof thetransformer’soutputisaccomplishedwithsynchronous rectifiers.Thesedevices,whichareMOSFETswithaverylow on-stateresistance,dissipatefarlessenergythanSchottky diodes.ThisistheprimaryreasonthatthePowerQorcon- verterhassuchhighefficiency,evenatverylowoutputvolt- agesandveryhighoutputcurrents. Dissipationthroughouttheconverterissolowthatitdoes notrequireaheatsinkforoperation.Sinceaheatsinkisnot required,thePowerQorconverterdoesnotneedametal baseplateorpottingmaterialtohelpconductthedissipated energytotheheatsink.ThePowerQorconvertercanthusbe builtmoresimplyandreliablyusinghighyieldsurfacemount techniquesonaPCBsubstrate. ThePowerQorseriesofeighth-brick,quarter-brickandhalf- brickconvertersusestheindustrystandardfootprintand pin-outconfiguration. CONTROLFEATURES REMOTE ON/OFF (Pin 2):TheON/OFFinput,Pin2,permits theusertocontrolwhentheconverterisonoroff.Thisinputis referencedtothereturnterminaloftheinputbus,Vin(-).There aretwoversionsoftheconverterthatdifferbythesenseofthe logicusedfortheON/OFFinput. In the positive logic version, the ON/OFF input is active high (meaningthatahighturnstheconverteron).Inthenegative logicversion,theON/OFFsignalisactivelow(meaningthata lowturnstheconverteron).FigureAdetailsfivepossiblecircuits for driving the ON/OFF pin. Figure B is a detailed look of the internalON/OFFcircuitry. REMOTE SENSE(+) (Pins 7 and 5):TheSENSE(+)inputs correctforvoltagedropsalongtheconductorsthatconnect theconverter’soutputpinstotheload. Pin7shouldbeconnectedtoVout(+)andPin5shouldbe connectedtoVout(-)atthepointontheboardwhereregula- tionisdesired.Aremoteconnectionattheloadcanadjust foravoltagedroponlyaslargeasthatspecifiedinthis datasheet,thatis [Vout(+)-Vout(-)]–[Vsense(+)-Vsense(-)]< SenseRange%xVout Pins7and5mustbeconnectedforproperregulationof theoutputvoltage.Iftheseconnectionsarenotmade,the converterwilldeliveranoutputvoltagethatisslightlyhigher thanitsspecifiedvalue. Note:theoutputover-voltageprotectioncircuitsensesthe voltageacrosstheoutput(pins8and4)todeterminewhen itshouldtrigger,notthevoltageacrosstheconverter’ssense leads(pins7and5).Therefore,theresistivedroponthe boardshouldbesmallenoughsothatoutputOVPdoesnot trigger,evenduringloadtransients. OpenCollectorEnableCircuit Figure A: Various circuits for driving the ON/OFF pin. Figure B: Internal ON/OFF pin circuitry RemoteEnableCircuit DirectLogicDrive NegativeLogic (PermanentlyEnabled) PositiveLogic (PermanentlyEnabled) ON/OFF Vin(-) ON/OFF ON/OFF Vin(-) ON/OFF 5V TTL/ CMOS Vin(-) ON/OFF Vin(-) Vin(- ) TTL 5V 50k 10k ON/OFF Vin(-) 100pF |
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