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PQ60260HTB10 Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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PQ60260HTB10 Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 13 page  Product # PQ60260HTB10 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2HTB26F Rev. H 10/10/08 Page 9 Input: Output: Current: Package: 35-75 V 26 V 9.6 A (250W) Half-brick Technical Specification BASICOPERATIONANDFEATURES ThePowerQorseriesconverterusesatwo-stagepowerconversion topology.Thefirststageisabuck-converterthatkeepstheoutput voltage constant over variations in line, load, and temperature. Thesecondstageusesatransformertoprovidethefunctionsof input/outputisolationandvoltagestep-downtoachievethelow outputvoltagerequired. Both the first stage and the second stage switch at a fixed fre- quencyforpredictableEMIperformance.Rectificationofthetrans- former’soutputisaccomplishedwithsynchronousrectifiers.These devices,whichareMOSFETswithaverylowon-stateresistance, dissipatefarlessenergythanSchottkydiodes.Thisistheprimary reasonthatthePowerQorconverterhassuchhighefficiency,even atverylowoutputvoltagesandveryhighoutputcurrents. Dissipation throughout the converter is so low that it does not requireaheatsinkforoperation.Sinceaheatsinkisnotrequired, thePowerQorconverterdoesnotneedametalbaseplateorpot- tingmaterialtohelpconductthedissipatedenergytotheheatsink. ThePowerQorconvertercanthusbebuiltmoresimplyandreliably usinghighyieldsurfacemounttechniquesonaPCBsubstrate. The PowerQor series of half-brick, quarter-brick and eighth-brick convertersusestheindustrystandardfootprintandpin-outconfigura- tion. CONTROLFEATURES REMOTE ON/OFF (Pin 2):TheON/OFFinput,Pin2,permits theusertocontrolwhentheconverterisonoroff.Thisinputisref- erencedtothereturnterminaloftheinputbus,Vin(-).Thereare twoversionsoftheconverterthatdifferbythesenseofthelogic usedfortheON/OFFinput. In the positive logic version, the ON/OFF input is active high (meaningthatahighturnstheconverteron).Inthenegativelogic version, the ON/OFF signal is active low (meaning that a low turnstheconverteron).FigureAdetailsfivepossiblecircuitsfor drivingtheON/OFFpin.FigureBisadetailedlookoftheinternal ON/OFFcircuitry. REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’soutputpinstotheload. Pin8shouldbeconnectedtoVout(+)andPin6shouldbecon- nected to Vout(-) at the point on the board where regulation is desired.Aremoteconnectionattheloadcanadjustforavoltage droponlyaslargeasthatspecifiedinthisdatasheet,thatis [Vout(+)-Vout(-)]–[Vsense(+)-Vsense(-)]< SenseRange%xVout Pins8and6mustbeconnectedforproperregulationoftheout- putvoltage.Iftheseconnectionsarenotmade,theconverterwill deliveranoutputvoltagethatisslightlyhigherthanitsspecified value. Note:theoutputover-voltageprotectioncircuitsensesthevoltage acrosstheoutput(pins9and5)todeterminewhenitshouldtrig- ger,notthevoltageacrosstheconverter’ssenseleads(pins8and 6).Therefore, the resistive drop on the board should be small enough so that output OVP does not trigger, even during load transients. OUTPUT VOLTAGE TRIM (Pin 7):TheTRIMinputpermitsthe usertoadjusttheoutputvoltageacrossthesenseleadsupordown accordingtothetrimrangespecifications. 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 274k Vin(+) ON/OFF Vin(_) 50k 100pF |
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