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MCOTS-C-28-24-QT Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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MCOTS-C-28-24-QT Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 13 page  Product # MCOTS-C-28-24-QT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005283 Rev. 1 06/16/09 Page 9 Output: Current: 24V 5A MCOTS-C-28-24-QT Technical Specification OUTPUT VOLTAGE TRIM (Pin 6):TheTRIMinputpermitsthe usertoadjusttheoutputvoltageacrossthesenseleadsupor downaccordingtothetrimrangespecifications. To decrease the output voltage, the user should connect a resistorbetweenPin6andPin5(SENSE(-)input).Foradesired decreaseofthenominaloutputvoltage,thevalueoftheresistor shouldbe Rtrim-down= (511)-10.22(kW) ∆% where ∆% = Vnominal–Vdesiredx100% Vnominal To increase the output voltage, the user should connect a resistorbetweenPin6andPin7(SENSE(+)input).Foradesired increaseofthenominaloutputvoltage,thevalueoftheresistor shouldbe Trim graphs show the relationship between the trim resistor valueandRtrim-upandRtrim-down,showingthetotalrangethe outputvoltagecanbetrimmedupordown. Note:theTRIMfeaturedoesnotaffectthevoltageatwhichthe outputover-voltageprotectioncircuitistriggered.Trimmingthe outputvoltagetoohighmaycausetheover-voltageprotection circuittoengage,particularlyduringtransients. ItisnotnecessaryfortheusertoaddcapacitanceattheTrim pin.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: The converter is designed toturnoffwhentheinputvoltageistoolow,helpingavoidan input system instability problem, described in more detail in the application note titled “Input System Instability” on our website.Thelockoutcircuitryisacomparatorwithdchysteresis. Whentheinputvoltageisrising,itmustexceedthetypicalTurn- On Voltage Threshold value (listed on the specifications page) before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Thresholdvaluebeforetheconverterwillturnoff. Output Current Limit: The maximum current limit remains constant as the output voltage drops. However, once the impedanceoftheloadacrosstheoutputissmallenoughtomake theoutputvoltagedropbelowthespecifiedOutputDCCurrent- LimitShutdownVoltage,theconverterturnsoff. Theconverterthenentersa“hiccupmode”whereitrepeatedly turnsonandoffata5Hz(nominal)frequencywitha5%duty cycleuntiltheshortcircuitconditionisremoved.Thisprevents excessiveheatingoftheconverterortheloadboard. Output Over-Voltage Limit:Ifthevoltageacrosstheoutput pinsexceedstheOutputOver-VoltageProtectionthreshold,the converterwillimmediatelystopswitching.Thispreventsdamage totheloadcircuitdueto1)excessiveseriesresistanceinoutput current path from converter output pins to sense point, 2) a releaseofashort-circuitcondition,or3)areleaseofacurrent limit condition. Load capacitance determines exactly how high theoutputvoltagewillriseinresponsetotheseconditions.After 200mstheconverterwillautomaticallyrestart. Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. Thethermalshutdowncircuitisdesignedtoturntheconverter off when the temperature at the sensed location reaches the Over-Temperature Shutdown value. It will allow the converter toturnonagainwhenthetemperatureofthesensedlocation fallsbytheamountoftheOver-TemperatureShutdownRestart Hysteresisvalue. Rtrim-up (kW) where Vout=NominalOutputVoltage 511 _ 10.22 5.11VOUTx(100+∆%) 1.225 ∆% ∆% ) = ( _ |
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