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MCOTS-C-28-48-QT Single Output Quarter Brick
MILITARY COTS DC/DC CONVERTER
16-40V
Continuous Input
16-50V
Transient Input
48V
Output
2.5A
Output
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Full Power Operation: -55C to +100C
TheMilQorseriesofMIL-COTSDC/DCconvertersbrings SynQor's field proven high-efficiency synchronous rectification technology to the Military/Aerospace
91% @ 1.25A / 89% @ 2.5A Efficiency
Mil-COTS
industry. SynQor's ruggedized encased packaging approach ensures survivability in demanding environments. Compatible with the industry standard format,theseconvertersoperateatafixedfrequency, andfollowconservativecomponentderatingguidelines. Theyaredesignedandmanufacturedtocomplywitha widerangeofmilitarystandards Operational Features
Designed and Manufactured in the USA
* Highefficiency,89%atfullratedloadcurrent * Operatinginputvoltagerange:16-40V * FixedfrequencyswitchingprovidespredictableEMI * Nominimumloadrequirement
Mechanical Features
Protection Features
* Industrystandardquarter-brickpin-outconfiguration * Size:1.54"x2.39"x0.50" (39.0x60.6x12.7mm) * Totalweight:3oz(85g)
* Inputunder-voltagelockout * Outputcurrentlimitandshortcircuitprotection * Activebackbiaslimit * Outputover-voltageprotection * Thermalshutdown
Control Features
Screening/Qualification
* On/Offcontrolreferencedtoinputside * Remotesensefortheoutputvoltage * Outputvoltagetrimrangeof-20%,+10%
Safety Features
* 2250V,30MWinput-to-outputisolation * Certified60950-1requirementsforbasicinsulation (seeStandardsandQualificationspage) * CEMarked * RoHScompliant
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* AS9100andISO9100:2000certifiedfacility * QualificationconsistentwithMIL-STD-883 * Avialablewithstandardormilitarygradescreening * Pre-capinspectionperIPC-610,ClassIII * TemperaturecyclingperMIL-STD-883,Method1010, ConditionB,10cycles * Burn-Inat100Cbaseplatetemperature * FinalvisualinspectionperMIL-STD-2008 * Fullcomponenttraceability
Product # MCOTS-C-28-48-QT
www.synqor.com
Doc.# 005-0005282 Rev. 1
06/16/09
Page 1
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
BLOCK DIAGRAM
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TYPICAL CONNECTION DIAGRAM
Vin
External Input Filter

Vin(+)
Vout(+)
Electrolytic
Vsense(+)
Trim
Rtrim-up
ON/OFF
or
Vsense(_) Vout(_)
Rtrim-down
Cload
Iload
Vin(_)
Product # MCOTS-C-28-48-QT
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Doc.# 005-0005282 Rev. 1
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Page 2
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
MCOTS-C-28-48-QT ELECTRICAL CHRACTERISTICS
ABSOLUTE MAXIMUM RATINGS InputVoltage Non-Operating Operating OperatingTransientProtection IsolationVoltage InputtoOutput InputtoBase-Plate OutputtoBase-Plate OperatingTemperature StorageTemperature VoltageatON/OFFinputpin INPUT CHARACTERISTICS OperatingInputVoltageRange InputUnder-VoltageLockout Turn-OnVoltageThreshold Turn-OffVoltageThreshold LockoutVoltageHysteresis RecommendedExternalInputCapacitance InputFilterComponentValues(L\C) MaximumInputCurrent No-LoadInputCurrent DisabledInputCurrent ResponsetoInputTransient InputTerminalRippleCurrent RecommendedInputFuse OUTPUT CHARACTERISTICS OutputVoltageSetPoint OutputVoltageRegulation OverLine OverLoad OverTemperature TotalOutputVoltageRange OutputVoltageRippleandNoise Peak-to-Peak RMS OperatingOutputCurrentRange OutputDCCurrent-LimitInception OutputDCCurrent-LimitShutdownVoltage Back-DriveCurrentLimitwhileEnabled Back-DriveCurrentLimitwhileDisabled MaximumOutputCapacitance OutputVoltageduringLoadCurrentTransient StepChangeinOutputCurrent(0.1A/s) SettlingTime OutputVoltageTrimRange OutputVoltageRemoteSenseRange OutputOver-VoltageProtection DYNAMIC CHARACTERISTICS Turn-OnTransient Turn-OnTime Start-UpInhibitTime OutputVoltageOvershoot EFFICIENCY 100%Load 50%Load Ta=25C,airflowrate=300LFM,Vin=28Vdcunlessotherwisenoted;fulloperatingtemperaturerangeis-40Cto+100Cbaseplatetemperaturewith appropriatepowerderating.Specificationssubjecttochangewithoutnotice.
Parameter
Min.
Typ.
Max.
60 40 50
Units
V V V
Notes & Conditions
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-40 -55 -2 16 2250 2250 2250 100 125 18 40 Vdc Vdc Vdc C C V V Baseplatetemperature 28 15.1 14.2 15.4 14.5 0.9 100 1.0\6.6 80 2 1 320 48 15.7 14.8 11.2 100 4 TBD V V V F H\F A mA mA V mA A V 50Vtransientfor1s TypicalESR0.1-0.2 Internalvalues;seeFigureE Vinmin;trimup;incurrentlimit SeeFigure6 RMS Fastactingexternalfuserecommended 47.52 48.48 -720 46.80 0 0.1 0.1 0.3 0.3 720 49.20 80 20 2.5 3.3 % % mV V 0 2.8 40 10 3.0 24 0.06 TBD 100 mV mV A A V A mA F mV s % % V ms ms % % % Oversample,line,load,temperature&life 20MHzbandwidth;seeNote1 Fullload Fullload Subjecttothermalderating Outputvoltage10%Low Negativecurrentdrawnfromoutput Negativecurrentdrawnfromoutput Voutnominalatfullload(resistiveload) -20 1400 100 56.16 58.56 9 230 0 89 91 10 10 60.96 200 250 Fullload,Vout=90%nom. -40Cto+125C;FigureF MaximumOutputCapacitance SeeFigure1forefficiencycurve SeeFigure1forefficiencycurve
Product # MCOTS-C-28-48-QT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005282 Rev. 1 06/16/09
Continuous Continuous 1stransient,squarewave
50%to75%to50%Ioutmax Towithin1%Voutnom AcrossPins8&4;CommonFigures3-5;seeNote2 AcrossPins8&4 Overfulltemprange
Page 3
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
MCOTS-C-28-48-QT ELECTRICAL CHRACTERISTICS (cont.)
Ta=25C,airflowrate=300LFM,Vin=28Vdcunlessotherwisenoted;fulloperatingtemperaturerangeis-40Cto+100Cbaseplatetemperature withappropriatepowerderating.Specificationssubjecttochangewithoutnotice. ISOLATION CHARACTERISTICS IsolationVoltage(dielectricstrength) SeeAbsoluteMaximumRatings IsolationResistance 30 M IsolationCapacitance(inputtooutput) 1000 pF SeeNote1 TEMPERATURE LIMITS FOR POWER DERATING CURVES SemiconductorJunctionTemperature 125 C Packageratedto150C BoardTemperature 125 C ULratedmaxoperatingtemp130C TransformerTemperature 125 C MaximumBaseplateTemperature,Tb 100 C FEATURE CHARACTERISTICS SwitchingFrequency 230 250 270 kHz Forbothinputandisolationstage ON/OFFControl Off-StateVoltage 2.4 18 V On-StateVoltage -2 0.8 ON/OFFControl ApplicationnotesFiguresA&B Pull-UpVoltage 5 V Pull-UpResistance 50 k Over-TemperatureShutdownOTPTripPoint 125 C AveragePCBTemperature Over-TemperatureShutdownRestartHysteresis 10 C RELIABILITY CHARACTERISTICS CalculatedMTBF(Telcordia)TR-NWT-000332 TBD 106Hrs. 80%load,200LFM,40CTa CalculatedMTBF(MIL-217)MIL-HDBK-217F TBD 106Hrs. 80%load,200LFM,40CTa FieldDemonstratedMTBF 106Hrs. Seeourwebsitefordetails Note1:Highervaluesofisolationcapacitancecanbeaddedexternaltothemodule.
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Product # MCOTS-C-28-48-QT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005282 Rev. 1 06/16/09
Page 4
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
95 90
16 20 18
85
Power Dissipation (W)
14 12 10 8 6 4 2 0
Efficiency (%)
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75 70 65 60 40 Vin 28 Vin 16 Vin
40 Vin 28 Vin 16 Vin
80
0.0
0.5
1.0
1.5
2.0
2.5
0.0
0.5
1.0
1.5
2.0
2.5
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25C.
Figure 2: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25C.
3.0
3.0
2.5
2.5
2.0
2.0
Iout (A)
1.5
Iout (A)
1.5
1.0
1.0
400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s)
400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s)
0.5
0.5
0.0
0.0
0
25
40
55
70
85
0
25
40
55
70
85
Ambient Air Temperature (C)
Ambient Air Temperature (C)
Figure 3: Encased converter (without heatsink) max. output power derating vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM. Air flows across the converter from pin 3 to pin 1 (nominal input voltage).
Figure 4: Encased converter (with 1/4" heatsink) max. output power derating vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM. Air flows across the converter from pin 3 to pin 1 (nominal input voltage).
Figure 5: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1 A/s). Load cap: 1 F ceramic and 15 F tantalum capacitors. Ch 1: Vout (2V/div), Ch 2: Iout (1A/div).
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Figure 6: Output voltage response to step-change in input voltage (500 V/ms). Load cap: 100 F, electrolytic output capacitance. Ch 1: Vout (1V/div), Ch 2: Vin (20V/div).
Doc.# 005-0005282 Rev. 1 06/16/09
Product # MCOTS-C-28-48-QT
www.synqor.com
Page 5
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
120
Nominal Vout
100
Typical Current Limit Inception Point
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Output Voltage (%)
80 Typical Output Voltage at Shutdown 60 40 Vin min 20 Vin nom Vin max 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
Load Current (% )
Figure 7: Typical startup waveform. Input voltage pre-applied, ON/OFF Pin on Ch 2.
100,000.0
Figure 8: Output voltage vs. load current showing typical current limit curves and converter shutdown points.
Trim Up
Trim Down
Trim Resistance (kOhms)
10,000.0
1,000.0
100.0
10.0
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
Figure 9: Trim graph for trim-up, trim down.
Product # MCOTS-C-28-48-QT
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Doc.# 005-0005282 Rev. 1
06/16/09
Page 6
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
MIL-COTS Qualification
Test Name LifeTesting Details
Visual,mechanicalandelectricaltestingbefore,duringandafter1000hour burn-in@fullload Visual,mechanicalandelectricaltestingbefore,duringandaftershockand vibrationtests +85C,85%RH,1000hours,2minuteson/6hoursoff 500cyclesof-40Cto+100C(30 minutedwellateachtemperature 15pins
#Tested (# Failed)
15 (0)
Consistent with MIL-STD-883F Method Method1005.8
Consistent with MILSTD-883F Method 5005
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Shock-Vibration Humidity
5 (0) 8 (0)
MIL-STD-202,Method1
Method1004.7
TemperatureCycling Solderability DMT
10 (0) 15 (0)
Method1010.8 Method2003
ConditionA
-65Cto+110Cacrossfulllneand loadspecificatonsin5Csteps
7 (0)
MIL-COTS Screening
Screening
Process Description
Standard
Military (MIL Grade)
BaseplateOperatingTemperature StorageTemperature Pre-Capinspection TemperatureCyclling Burn-In
-55Cto+100C -65Cto+135C
-55Cto+100C -65Cto+135C
IPC-610,ClassIII
Method1010,ConditionB, 10Cycles 100CBaseplate 100% MIL-STD-2008
12Hours 25C
96Hours
FinalElectricalTest
-55C,+25C,+100C
FinalVisualInspection
Product # MCOTS-C-28-48-QT
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Doc.# 005-0005282 Rev. 1
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Page 7
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
BASICOPERATIONANDFEATURES
This MIL-COTS converter series uses a two-stage power conversion topology. The first stage is a buck-converter that keepstheoutputvoltageconstantovervariationsinline,load, and temperature. The second stage uses a transformer to providethefunctionsofinput/outputisolationandvoltagestepuporstep-downtoachievetheoutputvoltagerequired. Both the first stage and the second stage switch at a fixed frequency for predictable EMI performance. Rectification of the transformer's output is accomplished with synchronous rectifiers. These devices, which are MOSFETs with a very low on-state resistance, dissipate far less energy than Schottky diodes. This is the primary reason that the converter has such highefficiency,evenatverylowoutputvoltagesandveryhigh outputcurrents.
CONTROLFEATURES
REMOTE ON/OFF (Pin 2):TheON/OFFinput,Pin2,permits the user to control when the converter is on or off. This input is referenced to the return terminal of the input bus, Vin(-). TheON/OFFsignalisactivelow(meaningthatalowturnsthe converteron).FigureAdetailsfourpossiblecircuitsfordriving theON/OFFpin.FigureBisadetailedlookoftheinternalON/ OFFcircuitry.
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REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs correctforvoltagedropsalongtheconductorsthatconnectthe converter'soutputpinstotheload. Pin 7 should be connected to Vout(+) and Pin 5 should be connectedtoVout(-)atthepointontheboardwhereregulation is desired. A remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, thatis Theseconvertersareofferedtotallyencasedtowithstandharsh environmentsandthermallydemandingapplications.Dissipation throughout the converter is so low that it does not require a heatsink for operation in many applications; however, adding a heatsink provides improved thermal derating performance in extremesituations. Thisseriesofconvertersusetheindustrystandardfootprintand pin-outconfiguration.
[Vout(+)-Vout(-)]-[Vsense(+)-Vsense(-)]<
SenseRange%xVout
Pins 7 and 5 must be connected for proper regulation of the output voltage. If these connections are not made, the converter will deliver an output voltage that is slightly higher thanitsspecifiedvalue.
Note: the output over-voltage protection circuit senses the voltage across the output (pins 8 and 4) to determine when it should trigger, not the voltage across the converter's sense leads(pins7and5).Therefore,theresistivedropontheboard should be small enough so that output OVP does not trigger, evenduringloadtransients.
ON/OFF
ON/OFF
Vin(_)
Vin(_)
5V
RemoteEnableCircuit
NegativeLogic (PermanentlyEnabled) ON/OFF 5V
50k
ON/OFF
50k
TTL/ CMOS
TTL
ON/OFF
100pF
Vin(_)
Vin(_)
Vin(_)
OpenCollectorEnableCircuit
DirectLogicDrive
Figure A: Various circuits for driving the ON/OFF pin.
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Figure B: Internal ON/OFF pin circuitry
06/16/09
Product # MCOTS-C-28-48-QT
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Doc.# 005-0005282 Rev. 1
Page 8
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
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
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,itmustexceedthetypicalTurnOn 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 theoutputvoltagedropbelowthespecifiedOutputDCCurrentLimitShutdownVoltage,theconverterturnsoff.
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Rtrim-down= 511 -10.22 (kW) %
()
where
% =
Vnominal-Vdesired x100% Vnominal
To increase the output voltage, the user should connect a resistorbetweenPin6andPin7(SENSE(+)input).Foradesired increaseofthenominaloutputvoltage,thevalueoftheresistor shouldbe
Rtrim-up =
where
(
5.11VOUTx(100+%)
1.225%
_ 511 _ 10.22
%
)
(kW)
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.
Vout=NominalOutputVoltage
Trim graphs show the relationship between the trim resistor valueandRtrim-upandRtrim-down,showingthetotalrangethe outputvoltagecanbetrimmedupordown. Note:theTRIMfeaturedoesnotaffectthevoltageatwhichthe outputover-voltageprotectioncircuitistriggered.Trimmingthe output voltage too high may cause the over-voltage protection circuittoengage,particularlyduringtransients.
ItisnotnecessaryfortheusertoaddcapacitanceattheTrim pin.Thenodeisinternallybypassedtoeliminatenoise.
Total DC Variation of VOUT: For the converter to meet its full specifications, the maximum variation of the dc value of VOUT, duetobothtrimmingandremoteloadvoltagedrops,shouldnot begreaterthanthatspecifiedfortheoutputvoltagetrimrange.
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 to turn on again when the temperature of the sensed location fallsbytheamountoftheOver-TemperatureShutdownRestart Hysteresisvalue.
Product # MCOTS-C-28-48-QT
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Doc.# 005-0005282 Rev. 1
06/16/09
Page 9
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
APPLICATIONCONSIDERATIONS
Input System Instability: This condition can occur because Application Circuits:FigureCprovidesatypicalcircuitdiagram any dc-dc converter appears incrementally as a negative whichdetailstheinputfilteringandvoltagetrimming. resistanceload.Adetailedapplicationnotetitled"InputSystem Instability"isavailableontheSynQorwebsitewhichprovides anunderstandingofwhythisinstabilityarises,andshowsthe preferredsolutionforcorrectingit.
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Vin(+) Vout(+)
Vin
External Input Filter
Electrolytic Capacitor
Vsense(+)
Trim
Rtrim-up
ON/OFF
or
Vsense(_) Vout(_)
Rtrim-down
Cload
Iload
Vin(_)
Figure C: Typical application circuit (negative logic unit, permanently enabled).
Input Filtering and External Capacitance:FigureDprovides adiagramshowingtheinternalinputfiltercomponents.Thisfilter dramaticallyreducesinputterminalripplecurrent,whichotherwise couldexceedtheratingofanexternalelectrolyticinputcapacitor.
The recommended external input capacitance is specified in the Input Characteristics section on the Electrical Characteristics page.Moredetailedinformationisavailableintheapplicationnote titled"EMICharacteristics"ontheSynQorwebsite.
Lin
Vin(+)
C1
C2
Regulation Stage
Isolation Stage
Vin(_)
Figure D: Internal Input Filter Diagram (component values listed on the specifications page).
Product # MCOTS-C-28-48-QT
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Page 10
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
Startup Inhibit Period:TheStartupInhibitPeriodensuresthat theconverterwillremainoffforapproximately200mswhenitis shutdownforanyreason.Whenanoutputshortispresent,this generates a 5 Hz "hiccup mode," which prevents the converter fromoverheating.Inall,therearesevenwaysthattheconverter canbeshutdown,initiatingaStartupInhibitPeriod: * InputUnder-VoltageLockout * InputOver-VoltageShutdown * OverTemperatureShutdown * CurrentLimit * ShortCircuitProtection When the ON/OFF pin goes high after t2, the Startup Inhibit Period has elapsed, and the output turns on within the typical Turn-OnTime. Thermal Considerations:Themaximumoperatingbase-plate temperature,TB,is100C.Aslongastheuser'sthermalsystem keepsTB<100C,theconvertercandeliveritsfullratedpower. Apowerderatingcurvecanbecalculatedforanyheatsinkthatis attached to the base-plate of the converter. It is only necessary todeterminethethermalresistance,RTHBA,ofthechosenheatsink between the base-plate and the ambient air for a given airflow rate. This information is usually available from the heatsink vendor.Thefollowingformulacanthebeusedtodeterminethe maximumpowertheconvertercandissipateforagiventhermal conditionifitsbase-plateistobenohigherthan100C.
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* OutputOver-VoltageProtection * TurnedoffbytheON/OFFinput
Vin
Under-Voltage LockoutTurnOnThreshold
FigureEshowsthreeturn-onscenarios,whereaStartupInhibit 100C-TA max Periodisinitiatedatt0,t1,andt2: Pdiss = RTHBA Beforetimet0,whentheinputvoltageisbelowtheUVLthreshold, theunitisdisabledbytheInputUnder-VoltageLockoutfeature. Thisvalueofpowerdissipationcanthenbeusedinconjunction WhentheinputvoltagerisesabovetheUVLthreshold,theInput withthedatashowninFigure2todeterminethemaximumload Under-VoltageLockoutisreleased,andaStartupInhibitPeriodis current (and power) that the converter can deliver in the given initiated.Attheendofthisdelay,theON/OFFpinisevaluated, thermalcondition. andsinceitisactive,theunitturnson. Forconvenience,powerderatingcurvesforanencasedconverter Attimet1,theunitisdisabledbytheON/OFFpin,anditcannot without a heatsink and with a typical heatsink are provided for eachoutputvoltage. beenabledagainuntiltheStartupInhibitPeriodhaselapsed.
ON/OFF
(neglogic)
ON
OFF ON
OFF
ON
Vout
9ms(typical
(typicalstart-up inhibitperiod)
200ms
turnontime)
200ms
200ms
t0
t1
t2
t
Figure E: Startup Inhibit Period (turn-on time not to scale)
Product # MCOTS-C-28-48-QT
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Page 11
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
Mechanical Drawing
Top View
1.5360.020(39.010.5) 0.600(15.24) 0.450(11.43) 0.300(7.62) 0.150(3.81) 0.2530.020 (6.40.5)
Side View
0.5000.025 (12.70.63) OverallHeight
0.180.010 (4.570.25)
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0.2630.020 (6.680.5)
87654
2.386 0.020 (60.60.5)
2.00 (50.8)
1.86 (47.2)
M3 Threaded Inserts 4Places SeeNotes
1
2
3
0.183.020 (4.65)0.5
0.4680.020 (11.890.5)
0.300(7.62) 0.600(15.24) 1.030(26.16)
NOTES
PIN DESIGNATIONS
Function Positiveinputvoltage
1) M3screwsusedtoboltunit'sbaseplatetoothersurfaces(suchasa heatsink)mustnotexceed0.100"(2.54mm)depthbelowthesurface ofthebaseplate. 2) Appliedtorqueperscrewshouldnotexceed6in-lb.(0.7Nm).
Pin 1 2 3
Name Vin(+)
ON/OFF Vin(-)
3) Baseplateflatnesstoleranceis0.004"(.10mm)TIRforsurface.
TTLinputtoturnconverteron andoff,referencedtoVin(-),with internalpullup. Negativeinputvoltage Negativeoutputvoltage Negativeremotesense1 Outputvoltagetrim2 Positiveremotesense3 Positiveoutputvoltage
4) Pins1-3,5-7are0.040"(1.02mm)diameter,with0.080"(2.03mm) diameterstandoffshoulders.
4 5 7 8
Vout(-) TRIM
5) Pins4and8are0.062"(1.57mm)diameterwith0.100"(2.54mm) diameterstandoffshoulders. 6) AllPins:Material-CopperAlloy-Finish(RoHS6/6)-MatteTinover Nickelplate 7) Undimensionedcomponentsareshownforvisualreferenceonly. 8) Weight:3.02oz.(85.7g)typical 9) Alldimensionsininches(mm) Tolerances:x.xx+/-0.02in.(x.x+/-0.5mm) x.xxx+/-0.010in.(x.xx+/-0.25mm)
SENSE(-)
6
SENSE(+) Vout(+)
Notes: 1)
SENSE(-)shouldbeconnectedtoVout(-)eitherremotelyor attheconverter. LeaveTRIMpinopenfornominaloutputvoltage.
2)
10) Workmanship:MeetsorexceedsIPC-A-610CClassII
3)
11) Recommendedpinlengthis0.03"(0.76mm)greaterthanthePCB thickness.
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SENSE(+)shouldbeconnectedtoVout(+)eitherremotelyor attheconverter.
Doc.# 005-0005282 Rev. 1 06/16/09
Product # MCOTS-C-28-48-QT
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Page 12
MCOTS-C-28-48-QT
Output: 48V Current: 2.5A
Technical Specification
Ordering Information/ Part Numbering
Family Product Input Voltage Output Voltage
1R2:1.2V 1R5:1.5V 1R8:1.8V 2R5:2.5V 3R3:3.3V 05:5V 07:7V 12:12V 15:15V 24:24V 28:28V 40:40V 48:48V P:Passive T:Active
Package
FT:FullBrick HP:HalfBrickPeta HZ:HalfBrickZeta QT:QuarterBrick EG:EighthBrick SM:SixteenthBrick
Heatsink Option
Screening Level
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MCOTS C:Converter F:Filter 28:16-40V 48:34-75V 270:155-400V N:Normal F:Flanged S:Standard M:M-Grade
Example MCOTS-C-28-48-QT-N-S
Application Notes
Avarietyofapplicationnotesandtechnicalwhitepaperscan bedownloadedinpdfformatfromourwebsite.
RoHS Compliance:TheEUledRoHS(RestrictionofHazardous Substances)DirectivebanstheuseofLead,Cadmium,Hexavalent Chromium, Mercury, Polybrominated Biphenyls (PBB), and PolybrominatedDiphenylEther(PBDE)inElectricalandElectronic Equipment. This SynQor product is 6/6 RoHS compliant. For more information please refer to SynQor's RoHS addendum availableatourRoHSCompliance/LeadFreeInitiativewebpage ore-mailusatrohs@synqor.com.
PATENTS
SynQorholdsthefollowingpatents,oneormoreofwhichmightapplytothisproduct: 5,999,417 6,594,159 6,927,987 7,119,524 6,222,742 6,731,520 7,050,309 7,269,034 6,545,890 6,894,468 7,072,190 7,272,021
6,577,109 6,896,526 7,085,146 7,272,023
Contact SynQor for further information:

Phone: TollFree: Fax: E-mail: Web: Address:
978-849-0600 888-567-9596 978-849-0602 mqnbofae@synqor.com www.synqor.com 155SwansonRoad Boxborough,MA01719 USA
Warranty SynQoroffersatwo(2)yearlimitedwarranty.Completewarranty informationislistedonourwebsiteorisavailableuponrequestfrom SynQor. InformationfurnishedbySynQorisbelievedtobeaccurateandreliable. However,noresponsibilityisassumedbySynQorforitsuse,norforany infringementsofpatentsorotherrightsofthirdpartieswhichmayresult fromitsuse.Nolicenseisgrantedbyimplicationorotherwiseunderany patentorpatentrightsofSynQor.
Product # MCOTS-C-28-48-QT
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005282 Rev. 1
06/16/09
Page 13

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