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PQ60240QGA05NRS Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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PQ60240QGA05NRS Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 13 page  Input: Output: Current: Package: Technical Specification 35 - 75 V 24 V 5.0 A Quarter-brick Product # PQ60240QGA05 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2-QGA624D Rev. B 10/01/08 Page 9 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. Both the first stage and the second stage switch at a fixed fre- quency for predictable EMI performance. Rectification of the transformer’soutputisaccomplishedwithsynchronousrectifiers. These devices, which are MOSFETs with a very low on-state resistance, dissipate far less energy than Schottky diodes. This istheprimaryreasonthatthePowerQorconverterhassuchhigh efficiency,evenatverylowoutputvoltagesandveryhighoutput currents. 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 and quarter-brick converters usestheindustrystandardfootprintandpin-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).Inthenegativelogic version, the ON/OFF signal is active low (meaning that a low turnstheconverteron).FigureAdetailsfivepossiblecircuitsfor drivingtheON/OFFpin.FigureBisadetailedlookoftheinter- nalON/OFFcircuitry. REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs correctforvoltagedropsalongtheconductorsthatconnectthe converter’soutputpinstotheload. Pin7shouldbeconnectedtoVout(+)andPin5shouldbecon- nected to Vout(-) at the point on the board where regulation is desired.Aremoteconnectionattheloadcanadjustforavoltage droponlyaslargeasthatspecifiedinthisdatasheet,thatis [Vout(+)-Vout(-)]–[Vsense(+)-Vsense(-)]< SenseRange%xVout Pins 7 and 5 must be connected for proper regulation of the outputvoltage.Iftheseconnectionsarenotmade,theconverter willdeliveranoutputvoltagethatisslightlyhigherthanitsspeci- fiedvalue. 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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