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Technical Specification
IQ24500HEx08
18-36 V
Input
Output
50 V
Current
8A
2250 Vdc
Isolation
DC-DC Converter
Half-brick
The IQ24500HEx08 InQorTM Exa converter is an isolated, fixed switching frequency DC-DC converter thatusessynchronousrectificationtoachieveextremely highefficiencyandpowerdensity.The24Vinmodules feature 2,250 Vdc isolation and low common mode noise.TheExaseriesconvertersofferindustryleading usable output power for any standard "half-brick" module.RoHScompliant(seelastpage). Operational Features
*Ultra-highefficiency,94%atfullratedloadcurrent,95% athalfratedloadcurrent *Deliversupto8Aofoutputcurrent(400W) *Wideinputvoltagerange:18-36V,with50V100ms inputvoltagetransientcapability *Fixedfrequencyswitchingprovidespredictable EMIperformance *Nominimumloadrequirementmeansnopreload resistorsrequired *Wideoutputvoltagetrimrange(-50%to+10%)
IQ24500HEC08 Module
Protection Features
*Inputunder-voltagelockoutdisablesconverteratlowinput voltageconditions *Outputcurrentlimitandshortcircuitprotectionprotects converterandloadfromdamageandconsequent hazardousconditions *Activebackbiaslimitprovidessmoothstartupwith externalloadinducedpre-bias *Latchingoutputover-voltageprotectionprotectsloadfrom damagingvoltages *Thermalshutdownprotectsconverterfromabnormal environmentalconditions
Mechanical Features
* Industrystandardhalf-brickpin-outconfiguration * Bricksize:2.39"x2.49"(63.1x60.6mm) * Totalheightonly0.512"(13mm) * Totalweight:4.3oz.(123grams)
Control Features
* On/Offcontrolreferencedtoinputside
Safety Features
* 2250V,30Minput-to-outputisolation * UL60950-1:2003,basicinsulation * CAN/CSA-C22.2No.60950-1:2003 * EN60950-1:2001 * CEMarked * RoHScompliant(seePage12)
Product # IQ24500HEx08 Phone 1-888-567-9596
Contents
Mechanical Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 IQ24500HEx08 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . .3-4 Standards compliance and Qualification Testing . . . . . . . . . . . . . . . . . . . 4 IQ24500HEx08 Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7 Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Page No.
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Doc.# 005-IHE2450 Rev. C
03/31/09
Page 1
Technical Specification
Mechanical Diagram
2.486 2.00 1.400 1.000 .700 .400 [ 50.8 ] [ 35.56 ] [ 25.4 ] [ 17.78 ] [ 10.16 ] .243 .020 [ 6.17 0.5 ] .020 [ 63.14 0.5 ]
Input: Output: Current: Package:
18-36 V 50 V 8 A (400 W) Half-brick
.512
[
+.002 -.005 +0.05 13 -0.12 OVERALL HEIGHT
]
.163 [ 4.14 ]
9
2.386 .020 [ 60.6 0.5 ] 1.90 [ 48.3 ]
8
7
6
5
.243 .020 [ 6.17 0.5 ]
TOP VIEW
1.90 [ 48.3 ]
SIDE VIEW
.233 .020 [ 5.92 0.5 ]
1
2
3
4
.543 .400 1.00 1.400
.020 [ 13.79 0.5 ] [ 10.16 ] [ 25.4 ] [ 35.56 ]
THRU HOLE M3 (SEE NOTE 8) STANDOFFS (4)
.027
+.007 -.010 +0.17 0.69 -0.25 BOTTOMSIDE CLEARANCE
[
]
NOTES
1) APPLIED TORQUE PER SCREW SHOULD NOT EXCEED 6in-lb (0.7Nm). 2) BASEPLATE FLATNESS TOLERANCE IS 0.004" (.10mm) TIR FOR SURFACE. 3) PINS 1-4, 6-8 ARE 0.040" (1.02mm) DIA. WITH 0.080" (2.03mm) DIA. STANDOFF SHOULDERS 4) PINS 5 AND 9 ARE 0.080" (2.03mm) DIA. WITH .125" (3.18) DIA. STANDOFF SHOULDERS 5) ALL PINS: MATERIAL: COPPER ALLOY FINISH: MATTE TIN OVER NICKEL PLATE 6) UNDIMENSIONED COMPONENTS ARE SHOWN FOR VISUAL REFERENCE ONLY 7) WEIGHT: 139g/4.9oz 8) THREADED OR NON-THREADED OPTIONS AVAILABLE 9) ALL DIMENSIONS IN INCHES(mm) TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
PIN DESIGNATIONS
Pin 1 2 3 4 5 6 7 8 9 Notes: 1) 2) 3) SENSE(-) should be connected to Vout(-) either remotely or at the converter. Leave TRIM pin open for nominal output voltage. SENSE(+) should be connected to Vout(+) either remotely or at the converter.
Doc.# 005-IHE2450 Rev. C 03/31/09 Page 2
Name Vin(+) ON/OFF Reserved Vout(-) Vout(-) SENSE(-) TRIM SENSE(+) Vout(+)
Function Positive input voltage TTL input to turn converter on and off, referenced to Vin(-), with internal pull up. Not Connected Negative output voltage Negative output voltage Negative remote sense1 Positive remote sense3 Positive output voltage Output voltage trim2
Product # IQ24500HEx08
Phone 1-888-567-9596
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Technical Specification
IQ24500HEx08 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS InputVoltage Non-Operating Operating OperatingTransientProtection IsolationVoltage(inputtooutput) OperatingTemperature StorageTemperature VoltageatON/OFFinputpin INPUT CHARACTERISTICS OperatingInputVoltageRange InputUnder-VoltageLockout Turn-OnVoltageThreshold Turn-OffVoltageThreshold LockoutVoltageHysteresis MaximumInputCurrent No-LoadInputCurrent DisabledInputCurrent ResponsetoInputTransient InputReflectedRippleCurrent InputTerminalRippleCurrent RecommendedInputFuse InputFilterComponentValues(L\C) RecommendedExternalInputCapacitance OUTPUT CHARACTERISTICS OutputVoltageSetPoint OutputVoltageRegulation OverLine1 OverLoad1 OverTemperature TotalOutputVoltageRange OutputVoltageRippleandNoise2 Peak-to-Peak RMS OperatingOutputCurrentRange OutputDCCurrent-LimitInception OutputDCCurrent-LimitShutdownVoltage3 Back-DriveCurrentLimitwhileEnabled Back-DriveCurrentLimitwhileDisabled MaximumOutputCapacitance DYNAMIC CHARACTERISTICS OutputVoltageduringLoadCurrentTransient ForaStepChangeinOutputCurrent(0.1A/s) ForaStepChangeinOutputCurrent(5A/s) SettlingTime Turn-OnTransient Turn-OnTime OutputVoltageOvershoot EFFICIENCY 100%Load 50%Load TEMPERATURE LIMITS FOR POWER DERATING CURVES SemiconductorJunctionTemperature BoardTemperature TransformerTemperature ISOLATION CHARACTERISTICS IsolationVoltage(dielectricstrength) IsolationResistance IsolationCapacitance4
Input: Output: Current: Package:
18-36 V 50 V 8 A (400 W) Half-brick
TA=25C, airflow rate=300 LFM, Vin=24Vdc unless otherwise noted; full operating temperature range is -40C to +100C ambient temperaturewithappropriatepowerderating.Specificationssubjecttochangewithoutnotice.
Min.
-40 -55 -2 18 16.5 15.0 1.0 48.60 48.5 0 9 1 0 24
Typ.
24 17.0 15.5 1.5 300 100 1.5 5 150 0.34\23 470 50.00 +0.25\125 +0.25\125 +0.380 200 50 10 20 3 3 2 2 8 35 94 95 2250 30 1000
Max.
50 40 50 2250 100 125 18 36 17.5 16.0 2.0 30 400 125 20 40 51.35 +1.000 51.45 250 65 8 11 4 7 1 40 2 125 125 125
Units
V V V V C C V V V V V A mA mA V mA mA A H\F F V %\mV %\mV V V mV mV A A V A mA mF V V ms ms % % % C C C V MW pF
Notes & Conditions
Continuous Continuous 100mstransient,squarewave Basicinsulation,PollutionDegree2
50Vtransientfor100ms
100%Load,18Vin,trimmedup10% 0.25V/sinputtransient RMSthru3.3Hinductor RMS Fastblowexternalfuserecommended Internalvalues;seeFigureE TypicalESR0.1-0.2W
Oversample,line,load,temperature&life 20MHzbandwidth FullLoad FullLoad Subjecttothermalderating OutputVoltage10%Low Negativecurrentdrawnfromoutputsource Negativecurrentdrawnfromoutputsource 8AResistiveLoad 50%to75%to50%Ioutmax,200Floadcap " Towithin1%Voutnom Fullload,ON/OFFtoVout=90%nom. Noload,1mFloadcap Figures1&2 Figures1&2 Packageratedto150C ULratedmaxoperatingtemp130C
Note1:Lineandloadregulationislimitedbydutycyclequantizationanddoesnotindicateashiftintheinternalvoltagereference. Note2:Forapplicationsrequiringreducedoutputvoltagerippleandnoise,consultSynQorapplicationssupport(e-mail:support@synqor.com). Note3:IftheoutputvoltagefallsbelowtheOutputDCCurrentLimitShutdownVoltageformorethan50ms,thentheunitwillenterintohiccupmode,witha500msoff-time. Note4:Highervaluesofisolationcapacitancecanbeaddedexternaltothemodule.
Product # IQ24500HEx08
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Doc.# 005-IHE2450 Rev. C
03/31/09
Page 3
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS SwitchingFrequencyRegulationStage SwitchingFrequencyIsolationStage ON/OFFControl(OptionN) Off-StateVoltage On-StateVoltage ON/OFFControl ON/OFFControlHysteresis Pull-UpVoltage PullUpResistance OutputVoltageTrimRange OutputOver-VoltageProtection Over-TemperatureShutdown Over-TemperatureShutdownRestartHysteresis RELIABILITY CHARACTERISTICS CalculatedMTBF(Telcordia) CalculatedMTBF(MIL-217) FieldDemonstratedMTBF
Input: Output: Current: Package:
18-36 V 50 V 8 A (400 W) Half-brick
Min.
232 116.0 4.0 -2 4.75 -50 113
Typ.
235 117.5 1.5 5.00 10 118 120 10 TBD TBD
Max.
237 118.5 18 1.0 5.25 +10 123
Units
kHz kHz V V V V kW % % C C
Notes & Conditions
Oversample,temp&life Oversample,temp&life
MeasuredacrossPins9&5;seetrimsection Overfulltemprange;%ofnominalVout AveragePCBTemperature
106Hrs. TR-NWT-000332;80%load,300LFM,40CTa 106Hrs. MIL-HDBK-217F;80%load,300LFM,40CTa 106Hrs. Seewebsitefordetails
Standards compliance and Qualification Testing
Parameter
STANDARDS COMPLIANCE UL 60950-1:2003 CAN/CSA-C22.2 No. 60950-1:2003 EN60950-1:2001 CE Marked IEC 61000-4-2 2006/95/EC Low Voltage Directive ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance) Basic Insulation
Notes & Conditions
Note: An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or download from the SynQor website.
Parameter
QUALIFICATION TESTING Life Test Vibration Mechanical Shock Temperature Cycling Power/Thermal Cycling Design Marginality Humidity Solderability
# Units
32 5 5 10 5 5 5 15 pins
Test Conditions
95% rated Vin and load, units at derating point, 1000 hours 10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis 100g minimum, 2 drops in x and y axis, 1 drop in z axis -40 C to 100 C, unit temp. ramp 15 C/min., 500 cycles Toperating = min to max, Vin = min to max, full load, 100 cycles Tmin-10 C to Tmax+10 C, 5 C steps, Vin = min to max, 0-105% load 85 C, 85% RH, 1000 hours, continuous Vin applied except 5 min/day MIL-STD-883, method 2003
Product # IQ24500HEx08
Phone 1-888-567-9596
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Doc.# 005-IHE2450 Rev. C
03/31/09
Page 4
Technical Specification
100 95 50 60
Input: Output: Current: Package:
18-36 V 50 V 8 A (400 W) Half-brick
Power Dissipation (W)
90
Efficiency (%)
40
85 80 75 70 65 60 0 1 2 3 4 5 6 7 8 18 Vin 24 Vin 36 Vin
30
20 18 Vin 24 Vin 36 Vin 0 0 1 2 3 4 5 6 7 8
10
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.
9 8 7 6
9 8 7 6
Iout (A)
5 4 3 400 LFM (2.0 m/s) 2 1 0 25 40 55 70 85 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s)
Iout (A)
5 4 3 400 LFM (2.0 m/s) 2 1 0 25 40 55 70 85 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s)
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 input to output (nominal input voltage).
Figure 4: Encased converter (with 1/2" heatsink) max. output power derating vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM. Air flows across the converter from input to output (nominal input voltage).
Figure 5: Turn-on transient at full load (resistive load) (10 ms/div). Ch 1: Vout (10 V/div) Ch 2: ON/OFF input (5 V/div)
Product # IQ24500HEx08 Phone 1-888-567-9596
Figure 6: Turn-on transient at zero load (10 ms/div). Ch 1: ON/OFF input (5 V/div) Ch 2: Vout (10 V/div)
Doc.# 005-IHE2450 Rev. C 03/31/09 Page 5
www.synqor.com
Technical Specification
Input: Output: Current: Package:
18-36 V 50 V 8 A (400 W) Half-brick
Figure 7: Output voltage response to step-change in load current (50%-75%-50% of Iout(max); dI/dt = 0.1 A/s; 1 ms/div). Load cap: 1 uF ceramic and 330 F, 15 mW ESR electrolitic capacitors. Top trace: Vout (1 V/div). Bottom trace: Iout (5 A/div). Figure 11 3.3H
Figure 8: Output voltage response to step-change in load current (50%-75%-50% of Iout(max): dI/dt = 5 A/s; 2 ms/div). Load cap: 330 F, 15 mW ESR electrolytic capacitor. Top trace: Vout (1.0 V/div). Bottom trace: Iout 10 A/div).
source impedance
Figure 10 Figure 12
iS
VSOURCE
iC
DC-DC Converter 1F
VOUT
100F, 10mWESR
electrolytic capacitor
470F, 0.2WESR
electrolytic capacitor
ceramic capacitor
Figure 9: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 10), Input Reflected Ripple Current (Figure 11) and Output Voltage Ripple (Figure 12).
Figure 10: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 3.3 H source impedance and 470 F electrolytic capacitor (200 mA/div; 2 s/div). See Figure 9.
Figure 11: Input reflected ripple current, is, through a 3.3 H source inductor, using a 470 F input capacitor, at nominal input voltage and rated load current (10 mA/div; 2 s/div). See Figure 9.
Product # IQ24500HEx08 Phone 1-888-567-9596
Figure 12: Output voltage ripple at nominal input voltage and rated load current (50 mV/div; 2 s/div). Load capacitance: 1 F ceramic capacitor and 100 F electrolytic capacitor. Bandwidth: 20 MHz. See Figure 9.
Doc.# 005-IHE2450 Rev. C 03/31/09 Page 6
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Technical Specification
Input: Output: Current: Package:
18-36 V 50 V 8 A (400 W) Half-brick
Figure 13: Output voltage response to step-change in input voltage (18 V to 36 V in 200 s; 400 s/div). Load cap: 470 F, 15 mW ESR electrolytic capacitor. Top trace: Vin (5.0 V/div). Bottom trace: Vout (1.0 V/div), at zero load current.
61 57 53
Figure 14: Load current (5 A/div; 10 ms/div) as a function of time when the converter attempts to turn on into a 1 mW short circuit.
Output Voltage (V)
49 45 41 37 33 29 25 21 -4 -2 0 2 4 6 8 10 12 18 Vin 24 Vin 36 Vin
Load Current (A)
Figure 15: Output voltage vs. load current showing typical current limit curves and OVP shutdown point.
Product # IQ24500HEx08
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Doc.# 005-IHE2450 Rev. C
03/31/09
Page 7
Technical Specification
BASICOPERATIONANDFEATURES
Theconverterseriesusesatwo-stagepowerconversiontopology. Thefirststagekeepstheoutputvoltageconstantovervariationsin line,load,andtemperature.Thesecondstageusesatransformer toprovidethefunctionsofinput/outputisolationandvoltagestepdowntoachievethelowoutputvoltagerequired. Both the first stage and the second stage switch at a fixed frequencyforpredictableEMIperformance.Rectificationofthetransformer'soutputisaccomplishedwithsynchronousrectifiers.These devices,whichareMOSFETswithaverylowon-stateresistance, dissipatesignificantlylessenergythanSchottkydiodes,enabling theconvertertoachievehighefficiency. The series of half-brick, quarter-brick and eighth-brick converters usestheindustrystandardfootprintandpin-outconfiguration.
ON/OFF ON/OFF
Input: Output: Current: Package:
CONTROLFEATURES
18-36 V 50 V 8 A (400 W) Half-brick
REMOTE ON/OFF (Pin 2):TheON/OFFinput,Pin2,permits the user to control when the converter is on or off. This input is referencedtothereturnterminaloftheinputbus,Vin(-). The ON/OFF signal is active low (meaning that a low voltage turnstheconverteron).FigureAdetailsfourpossiblecircuitsfor drivingtheON/OFFpin. REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter'soutputpinstotheload. Pin8shouldbeconnectedtoVout(+)andPin6shouldbeconnectedtoVout(-)atthepointontheboardwhereregulationisdesired. If these connections are not made, the converter will deliver an outputvoltagethatisslightlyhigherthanitsspecifiedvalue. Note:Theoutputover-voltageprotectioncircuitsensesthevoltage acrossthesenseleads(pins8and6)todeterminewhenitshould trigger,notthevoltageacrosstheconverter'soutputpins(pins9 and5). OUTPUT VOLTAGE TRIM (Pin 7):TheTRIMinputpermitsthe user to adjust the output voltage across the sense leads up or down according to the trim range specifications. SynQor uses industrystandardtrimequations. Todecreasetheoutputvoltage,theusershouldconnectaresistor betweenPin7(TRIM)andPin6(SENSE(-)input).Foradesired decreaseofthenominaloutputvoltage,thevalueoftheresistor shouldbe:
Vin(_)
RemoteEnableCircuit
Vin(_)
NegativeLogic (PermanentlyEnabled)
ON/OFF
CMOS
5V ON/OFF
Vin(_)
OpenCollectorEnableCircuit
Vin(_)
DirectLogicDrive
Rtrim-down=
where
100% _ 2 kW
(
)
Figure A: Various circuits for driving the ON/OFF pin.
% =
Vnominal-Vdesired x100% Vnominal
Product # IQ24500HEx08
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Doc.# 005-IHE2450 Rev. C
03/31/09
Page 8
Technical Specification
Toincreasetheoutputvoltage,theusershouldconnectaresistor betweenPin7(TRIM)andPin8(SENSE(+)input).Foradesired increase of the nominal output voltage, the value of the resistor shouldbe
Input: Output: Current: Package:
PROTECTIONFEATURES
18-36 V 50 V 8 A (400 W) Half-brick
Rtrim-up
( Vnominal -2 ) xV 1.225 =
DES+VNOM
kW
VDES-VNOM
FigureBgraphstherelationshipbetweenthetrimresistorvalue, Rtrim-upandRtrim-down,showingthetotalrangetheoutputvoltagecanbetrimmedupordown.
100,000.0 100,000.0 10,000.0 10,000.0
Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping to avoid an input system instability problem, which is described in more detail in the application note titled "Input System Instability" on the SynQor website. The lockout circuitry is a comparator with DChysteresis.Whentheinputvoltageisrising,itmustexceedthe typical"Turn-OnVoltageThreshold"value*beforetheconverter willturnon.Oncetheconverterison,theinputvoltagemustfall below the typical Turn-Off Voltage Threshold value before the converterwillturnoff. Output Current Limit:Iftheoutputcurrentexceedsthe"Output DCCurrentLimitInception"point*,thenafastlinearcurrentlimit controller will reduce the output voltage to maintain a constant outputcurrent.Ifasaresult,theoutputvoltagefallsbelowthe "Output DCCurrent Limit Shutdown Voltage"* for more than 50ms,thentheunitwillenterintohiccupmode,witha500ms off-time.Theunitwillthenautomaticallyattempttorestart. Back-Drive Current Limit: If there is negative output current of a magnitude larger than the "Back-Drive Current Limit while Enabled"specification*,thenafastback-drivelimitcontrollerwill increasetheoutputvoltagetomaintainaconstantoutputcurrent. If this results in the output voltage exceeding the "Output OverVoltageProtection"threshold*,thentheunitwillshutdown.The fullI-VoutputcharacteristicscanbeseeninFigure15. Output Over-Voltage Limit: If the voltage directly across the output pins exceeds the "Output Over-Voltage Protection" threshold*, the converter will immediately stop switching. This shutdown is latching; unlike other shutdown types, the converter will not restart unless the input power is cycled or the ON/OFF inputistoggled. Over-Temperature Shutdown:Atemperaturesensoronthe convertersensestheaveragetemperatureofthemodule.Thethermalshutdowncircuitisdesignedtoturntheconverteroffwhenthe temperatureatthesensedlocationreachesthe"Over-Temperature Shutdown" value*. It will allow the converter to turn on again whenthetemperatureofthesensedlocationfallsbytheamountof the"Over-TemperatureShutdownRestartHysteresis"value*.
Trim Resistance (kOhms) Trim Resistance (kOhms)
1,000.0 1,000.0 100.0 100.0 10.0 1.0 0.1 0.0 0 5
10 15 20 25
30 30
35 35
40 40
45 45
50 50
% Increase in Vout
Decrease in Vout % Decrease in Vout
Figure B: Trim Graph for 28 Vout module Figure B: Trim Graph for 50 Vout module
Note: The TRIM feature does not affect the voltage at which the output over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the over-voltage protection circuittoengage,particularlyduringtransients. ItisnotnecessaryfortheusertoaddcapacitanceattheTrimpin. Thenodeisinternallyfilteredtoeliminatenoise. Total DC Variation of Vout:Fortheconvertertomeetitsfull specifications, the maximum variation of the DC value of Vout, duetobothtrimmingandremoteloadvoltagedrops,shouldnot begreaterthanthatspecifiedfortheoutputvoltagetrimrange.
*SeeElectricalCharacteristicspage.
Product # IQ24500HEx08 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 9
Technical Specification
APPLICATIONCONSIDERATIONS
Input System Instability:Thisconditioncanoccurbecause any DC-DC converter appears incrementally as a negative resistanceload.Adetailedapplicationnotetitled"InputSystem Instability"isavailableontheSynQorwebsitewhichprovides anunderstandingofwhythisinstabilityarises,andshowsthe preferredsolutionforcorrectingit. Application Circuits:FigureCbelowprovidesatypicalcircuit diagramwhichdetailstheinputfilteringandvoltagetrimming. Input Filtering and External Input Capacitance:FigureD belowshowstheinternalinputfiltercomponents.Thisfilterdramatically reduces input terminal ripple current, which otherwise couldexceedtheratingofanexternalelectrolyticinputcapacitor. The recommended external input capacitance is specified in the InputCharacteristicssectionontheElectricalSpecificationspage. More detailed information is available in the application note titled"EMICharacteristics"ontheSynQorwebsite.
Input: Output: Current: Package:
18-36 V 50 V 8 A (400 W) Half-brick
Output Filtering and External Output Capacitance: FigureDbelowshowstheinternaloutputfiltercomponents.This filterdramaticallyreducesoutputvoltageripple.However,some minimumexternaloutputcapacitanceisrequired,asspecifiedin theOutputCharacteristicssectionontheElectricalSpecifications page. No damage will occur without this capacitor connected, butpeakoutputvoltageripplewillbemuchhigher.
Vin(+) External Input Filter
Electrolytic Capacitor
Vout(+) Vsense(+) Rtrim-up
or
Vin
ON/OFF
Trim
Vsense(_) Vin(_) Vout(_)
Rtrim-down
Cload
Iload
Figure D: Typical application circuit (negative logic unit, permanently enabled).
L
Vin(+) C Vin(_)
Figure E: Internal Input Filter Diagram (component values listed on the specifications page).
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Doc.# 005-IHE2450 Rev. C
03/31/09
Page 10
Technical Specification
Startup Inhibit Period: The Startup Inhibit Period ensures that the converter will remain off for approximately 200 ms when it is shut down for any reason. When an output short is present, this generates a 5 Hz "hiccup mode," which prevents the converter from overheating. In all, there are seven ways that the converter can be shut down, initiating a Startup Inhibit Period: * Input Under-Voltage Lockout * Output Over-Voltage Protection * Over Temperature Shutdown * Current Limit * Short Circuit Protection * Turned off by the ON/OFF input Figure F shows three turn-on scenarios, where a Startup Inhibit Period is initiated at t0, t1, and t2: Before time t0, when the input voltage is below the UVL threshold, the unit is disabled by the Input Under-Voltage Lockout feature. When the input voltage rises above the UVL threshold, the Input Under-Voltage Lockout is released, and a Startup Inhibit Period is initiated. At the end of this delay, the ON/OFF pin is evaluated, and since it is active, the unit turns on. At time t1, the unit is disabled by the ON/OFF pin, and it cannot be enabled again until the Startup Inhibit Period has elapsed.
Vin
Under-Voltage Lockout TurnOn Threshold
Input: Output: Current: Package:
18-36 V 50 V 8 A (400 W) Half-brick
When the ON/OFF pin goes high after t2, the Startup Inhibit Period has elapsed, and the output turns on within the typical Turn-On Time. Thermal Considerations: The maximum operating baseplate temperature, TB, is 100 C. As long as the user's thermal system keeps TB < 100 C, the converter can deliver its full rated power. A power derating curve can be calculated for any heatsink that is attached to the base-plate of the converter. It is only necessary to determine the thermal resistance, RTHBA, of the chosen heatsink between the base-plate and the ambient air for a given airflow rate. This information is usually available from the heatsink vendor. The following formula can the be used to determine the maximum power the converter can dissipate for a given thermal condition if its base-plate is to be no higher than 100 C. Pdiss =
max
100 C - TA RTHBA
This value of power dissipation can then be used in conjunction with the data shown in Figure 2 to determine the maximum load current (and power) that the converter can deliver in the given thermal condition. For convenience, Figures 3 and 4 provide Power derating curves for an encased converter without a heatsink and with a typical heatsink.
ON/OFF
(neg logic)
ON
OFF ON
OFF
ON 9ms (typical turn on time)
Vout
(typical start-up inhibit period)
200ms
200ms
200ms
t0
t1
t2
t
Figure F: Startup Inhibit Period (turn-on time not to scale)
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Technical Specification
PART NUMBERING SYSTEM
The part numbering system for SynQor's dc-dc converters follows the format shown in the example below.
I Q 2 4 5 00 H E C 0 8 N R S -G 6/6RoHS Options(see
OrderingInformation)
Input: Output: Current: Package:
ORDERING INFORMATION
18-36 V 50 V 8 A (400 W) Half-brick
The tables below show the valid model numbers and ordering options for converters in this product family. When ordering SynQor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional characters for options. Add "-G" to the model number for 6/6 RoHS compliance.
Model Number IQ24280HEw14NRS-G IQ24500HEw08NRS-G Input Voltage 18 - 36 V 18 - 36 V Output Voltage 28 V 50 V Max Output Current 14 A 8A
OutputCurrent ThermalDesign PerformanceLevel PackageSize OutputVoltage InputVoltage ProductFamily
Thefollowingoptionsmustbeincludedinplaceofthe w x y z spacesinthemodelnumberslistedabove.
Options Description: w x y z Thermal Design Enable Logic Pin Style Feature Set
The first 12 characters comprise the base part number and the last 3 characters indicate available options. The "-G" suffix indicates 6/6 RoHS compliance.
C - Encased with Threaded Baseplate D - Encased with Non-Threaded Baseplate
N - Negative
R - 0.180"
S - Standard
Application Notes
A variety of application notes and technical white papers can be downloaded in pdf format from our website.
RoHS Compliance: The EU led RoHS (Restriction of Hazardous Substances) Directive bans the use of Lead, Cadmium, Hexavalent Chromium, Mercury, Polybrominated Biphenyls (PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical and Electronic Equipment. This SynQor product is 6/6 RoHS compliant. For more information please refer to SynQor's RoHS addendum available at our RoHS Compliance / Lead Free Initiative web page or e-mail us at rohs@synqor.com.
Not all combinations make valid part numbers, please contact SynQor for availability. See the Product Summary web page for more options.
PATENTS
SynQorholdsthefollowingpatents,oneormoreofwhich mightapplytothisproduct: 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: Toll Free: Fax: E-mail: Web: Address:
978-849-0600 888-567-9596 978-849-0602 power@synqor.com www.synqor.com 155 Swanson Road Boxborough, MA 01719 USA
Phone 1-888-567-9596
Warranty SynQor offers a two (2) year limited warranty. Complete warranty information is listed on our website or is available upon request from SynQor. Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SynQor.
Product # IQ24500HEx08
www.synqor.com
Doc.# 005-IHE2450 Rev. C
03/31/09
Page 12

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