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PQ60018QPA60NR2 Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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PQ60018QPA60NR2 Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 14 page  Product # PQ60018QPA60 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QP618F Rev. B 09/24/08 Page 10 Technical Specification Input: Output: Current: Package: 35 - 75 V 1.8 V 60 A Quarter-brick BASICOPERATIONANDFEATURES The PowerQor series converter uses a two-stage power conver- siontopology.Thefirststageisabuck-converterthatkeepsthe outputvoltageconstantovervariationsinline,load,andtempera- ture.Thesecondstageusesatransformertoprovidethefunctions of input/output isolation and voltage step-down to achieve the lowoutputvoltagerequired. Boththefirststageandthesecondstageswitchatafixedfrequency forpredictableEMIperformance.Rectificationofthetransformer’s outputisaccomplishedwithsynchronousrectifiers.Thesedevices, whichareMOSFETswithaverylowon-stateresistance,dissipate farlessenergythanSchottkydiodes.Thisistheprimaryreasonthat thePowerQorconverterhassuchhighefficiency,evenatverylow outputvoltagesandveryhighoutputcurrents. Dissipation throughout the converter is so low that it does not requireaheatsinkforoperation.Sinceaheatsinkisnotrequired, the PowerQor converter does not need a metal baseplate or potting material to help conduct the dissipated energy to the heatsink.ThePowerQorconvertercanthusbebuiltmoresimply andreliablyusinghighyieldsurfacemounttechniquesonaPCB substrate. The PowerQor series of half-brick, quarter-brick and eighth- brickconvertersusestheindustrystandardfootprintandpin-out configuration. 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).Inthenegativelogic version, the ON/OFF signal is active low (meaning that a low turnstheconverteron).FigureAdetailsfivepossiblecircuitsfor drivingtheON/OFFpin.FigureBisadetailedlookoftheinter- nalON/OFFcircuitry. REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correctforvoltagedropsalongtheconductorsthatconnectthe 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 Pins8and6mustbeconnectedforproperregulationoftheoutput voltage.Iftheseconnectionsarenotmade,theconverterwilldeliv- eranoutputvoltagethatisslightlylowerthanitsspecifiedvalue. Note:theoutputover-voltageprotectioncircuitsensesthevoltage acrosstheoutput(pins9and5)todeterminewhenitshouldtrigger, notthevoltageacrosstheconverter’ssenseleads(pins8and6). Therefore,theresistivedropontheboardshouldbesmallenough sothatoutputOVPdoesnottrigger,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 274k Vin(+) ON/OFF Vin(_) 50k 100pF |
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