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IQ24280HED14NRS-G Datasheet(PDF) 8 Page - SynQor Worldwide Headquarters |
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IQ24280HED14NRS-G Datasheet(HTML) 8 Page - SynQor Worldwide Headquarters |
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8 / 12 page  Input: Output: Current: Package: 18-36 V 50 V 8 A (400 W) Half-brick Technical Specification BASICOPERATIONANDFEATURES Theconverterseriesusesatwo-stagepowerconversiontopology. Thefirststagekeepstheoutputvoltageconstantovervariationsin line,load,andtemperature.Thesecondstageusesatransformer toprovidethefunctionsofinput/outputisolationandvoltagestep- downtoachievethelowoutputvoltagerequired. Both the first stage and the second stage switch at a fixed fre- quencyforpredictableEMIperformance.Rectificationofthetrans- former’soutputisaccomplishedwithsynchronousrectifiers.These devices,whichareMOSFETswithaverylowon-stateresistance, dissipatesignificantlylessenergythanSchottkydiodes,enabling theconvertertoachievehighefficiency. The series of half-brick, quarter-brick and eighth-brick converters usestheindustrystandardfootprintandpin-outconfiguration. CONTROLFEATURES REMOTE ON/OFF (Pin 2):TheON/OFFinput,Pin2,permits theusertocontrolwhentheconverterisonoroff.Thisinputis referencedtothereturnterminaloftheinputbus,Vin(-). The ON/OFF signal is active low (meaning that a low voltage turnstheconverteron).FigureAdetailsfourpossiblecircuitsfor drivingtheON/OFFpin. REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’soutputpinstotheload. Pin8shouldbeconnectedtoVout(+)andPin6shouldbeconnect- edtoVout(-)atthepointontheboardwhereregulationisdesired. Iftheseconnectionsarenotmade,theconverterwilldeliveran outputvoltagethatisslightlyhigherthanitsspecifiedvalue. Note:Theoutputover-voltageprotectioncircuitsensesthevoltage acrossthesenseleads(pins8and6)todeterminewhenitshould trigger,notthevoltageacrosstheconverter’soutputpins(pins9 and5). OUTPUT VOLTAGE TRIM (Pin 7):TheTRIMinputpermitsthe user to adjust the output voltage across the sense leads up or down according to the trim range specifications.SynQor uses industrystandardtrimequations. Todecreasetheoutputvoltage,theusershouldconnectaresistor betweenPin7(TRIM)andPin6(SENSE( –)input).Foradesired decreaseofthenominaloutputvoltage,thevalueoftheresistor shouldbe: Rtrim-down= (100%)_2kW ∆ where ∆% = Vnominal–Vdesired x100% Vnominal OpenCollectorEnableCircuit Figure A: Various circuits for driving the ON/OFF pin. RemoteEnableCircuit DirectLogicDrive NegativeLogic (PermanentlyEnabled) ON/OFF Vin(_ ) ON/OFF ON/OFF Vin(_ ) ON/OFF 5V CMOS Vin(_ ) Vin(_ ) Application Section Product # IQ24500HEx08 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 8 |
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