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PQ60018ETL45PRS Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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PQ60018ETL45PRS Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 14 page  Product # PQ60018ETL45 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2ET618F Rev. B 06/01/09 Page 11 Input: Output: Current: Package: 35-75 V 1.8 V 45 A Eighth-brick Technical Specification To increase the output voltage, the user should connect a resistor betweenPin6andPin7(SENSE(+)input).Foradesiredincrease of the nominal output voltage, the value of the resistor should be Rtrim-up (kW) ) where VOUT=NominalOutputVoltage = ( _ 511 _ 10.22 5.11VOUT(100+D%) 1.225D% D% FigureCgraphstherelationshipbetweenthetrimresistorvalue and Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down. 1 10 100 1,000 10,000 0 2 4 6 8 10 12 14 16 18 20 % increase Vout % decrease Vout 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 circuit to engage, particularly during transients. ItisnotnecessaryfortheusertoaddcapacitanceattheTrimpin. The node is internally bypassed to eliminate noise. Total DC Variation of Vout:Fortheconvertertomeetitsfull specifications, the maximum variation of the DC value of Vout, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range. PROTECTIONFEATURES Input Under-Voltage Lockout:Theconverterisdesignedto turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the applica- tionnotetitled“InputSystemInstability”.Thelockoutcircuitryisa comparatorwithDChysteresis.Whentheinputvoltageisrising,it mustexceedthetypicalTurn-OnVoltageThresholdvalue(listedon thespecificationpage)beforetheconverterwillturnon.Oncethe converter is on, the input voltage must fall below the typical Turn- OffVoltageThresholdvaluebeforetheconverterwillturnoff. Output Current Limit: Once the output current reaches the current-limit inception point, the converter will decrease the output voltage as the output current increases. However, once the imped- ance of the short across the output is small enough to make the outputvoltagedropbelowthespecifiedOutputDCCurrent-Limit ShutdownVoltage,theconverterturnsoff(seeFigure23). The converter then enters a “hiccup mode” where it repeatedly turnsonandoffata5Hz(nominal)frequencywitha5%duty cycle until the short circuit condition is removed. This prevents excessive heating of the converter or the load board. Output Over-Voltage Limit:Ifthevoltageacrosstheoutput pins exceeds the Output Over-Voltage Protection threshold, the converter will immediately stop switching. This prevents damage to the load circuit due to 1) excessive series resistance in output currentpathfromconverteroutputpinstosensepoint,2)arelease ofashort-circuitcondition,or3)areleaseofacurrentlimitcondi- tion. Load capacitance determines exactly how high the output voltagewillriseinresponsetotheseconditions.After200msthe converter will automatically restart. Over-Temperature Shutdown:Atemperaturesensoronthe converter senses the average temperature of the module. The ther- mal shutdown circuit is designed to turn the converter off when the temperatureatthesensedlocationreachestheOver-Temperature Shutdownvalue.Itwillallowtheconvertertoturnonagainwhen the temperature of the sensed location falls by the amount of the Over-TemperatureShutdownRestartHysteresisvalue. |
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