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PQ60018QPA60NKS Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ60018QPA60NKS Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 14 page  35 - 75 V 1.8 V 60 A Quarter-brick Product # PQ60018QPA60 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QP618F Rev. B 09/24/08 Page 11 Technical Specification Input: Output: Current: Package: 35 - 75 V 1.8 V 60 A Quarter-brick OUTPUT VOLTAGE TRIM (Pin 7):TheTRIMinputpermitsthe user to adjust the output voltage across the sense leads up or downaccordingtothetrimrangespecifications. Todecreasetheoutputvoltage,theusershouldconnectaresistor betweenPin7andPin6(SENSE(-)input).Foradesireddecrease ofthenominaloutputvoltage,thevalueoftheresistorshouldbe Rtrim-down= (511)-10.22(kW) D % where D% = Vnominal–Vdesired x100% Vnominal Toincreasetheoutputvoltage,theusershouldconnectaresistor betweenPin7andPin8(SENSE(+)input).Foradesiredincrease ofthenominaloutputvoltage,thevalueoftheresistorshouldbe Rtrim-up (kW) ) where VOUT=NominalOutputVoltage = ( _511 _10.22 5.11VOUT(100+D%) 1.225D% D% FigureCgraphstherelationshipbetweenthetrimresistorvalue andRtrim-upandRtrim-down,showingthetotalrangetheoutput voltagecanbetrimmedupordown. Figure C: Trim Graph for 1.8Vout module Note:theTRIMfeaturedoesnotaffectthevoltageatwhichthe output over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the over-voltage protection circuittoengage,particularlyduringtransients. ItisnotnecessaryfortheusertoaddcapacitanceattheTrimpin. Thenodeisinternallybypassedtoeliminatenoise. Total DC Variation of Vout:Fortheconvertertomeetitsfull specifications, the maximum variation of the DC value of Vout, duetobothtrimmingandremoteloadvoltagedrops,shouldnot begreaterthanthatspecifiedfortheoutputvoltagetrimrange. PROTECTIONFEATURES Input Under-Voltage Lockout:Theconverterisdesignedto turnoffwhentheinputvoltageistoolow,helpingavoidaninput systeminstabilityproblem,describedinmoredetailintheapplica- tionnotetitled“InputSystemInstability”.Thelockoutcircuitryisa comparatorwithDChysteresis.Whentheinputvoltageisrising,it mustexceedthetypicalTurn-OnVoltageThresholdvalue(listedon thespecificationpage)beforetheconverterwillturnon.Oncethe converterison,theinputvoltagemustfallbelowthetypicalTurn- OffVoltageThresholdvaluebeforetheconverterwillturnoff. Output Current Limit: The maximum current limit remains constantastheoutputvoltagedrops.However,oncetheimped- anceoftheshortacrosstheoutputissmallenoughtomakethe outputvoltagedropbelowthespecifiedOutputDCCurrent-Limit ShutdownVoltage,theconverterturnsoff. The converter then enters a “hiccup mode” where it repeatedly turnsonandoffata5Hz(nominal)frequencywitha5%duty cycle until the short circuit condition is removed. This prevents excessiveheatingoftheconverterortheloadboard. Output Over-Voltage Limit:Ifthevoltageacrosstheoutput pins exceeds the Output Over-Voltage Protection threshold, the converterwillimmediatelystopswitching.Thispreventsdamage totheloadcircuitdueto1)excessiveseriesresistanceinoutput currentpathfromconverteroutputpinstosensepoint,2)arelease ofashort-circuitcondition,or3)areleaseofacurrentlimitcondi- tion. Load capacitance determines exactly how high the output voltagewillriseinresponsetotheseconditions.After200msthe converterwillautomaticallyrestart. Over-Temperature Shutdown:Atemperaturesensoronthe convertersensestheaveragetemperatureofthemodule.Thether- malshutdowncircuitisdesignedtoturntheconverteroffwhenthe temperatureatthesensedlocationreachestheOver-Temperature Shutdownvalue.Itwillallowtheconvertertoturnonagainwhen thetemperatureofthesensedlocationfallsbytheamountofthe Over-TemperatureShutdownRestartHysteresisvalue. 10 100 1,000 10,000 0 2 4 6 8 10 12 14 16 18 20 % increase Vout % decrease Vout |
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