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Technical Specification
PQ60018ETL45
48Vin
Input
1.8Vout
Output
45A
Current
2250Vdc
Isolation
Eighth-brick
DC/DC Converter
The PQ60018ETL45 PowerQor(R) Tera eighth-brick converter is a next-generation, board-mountable, isolated, fixed switching frequency DC/DC converter that uses synchronous rectification to achieve extremely high conversion efficiency. The power dissipated by the converter is so low that a heatsink is not required, which saves cost, weight, height, and application effort. All of the power and control components are mounted to the multi-layer PCB substrate with high-yield surface mount technology. Since the PowerQor converter has no explicit thermal interfaces, it is extremely reliable. RoHS Compliant (see page 14). Operational Features
*Highefficiency,87%atfullratedloadcurrent *Deliversupto45Aofoutputcurrentwithminimalderating - no heatsink required *Wideinputvoltagerange:35-75V,with100V100ms input voltage transient capability *FixedfrequencyswitchingprovidespredictableEMI performance *Nominimumloadrequirement-nopreloadresistorsrequired
PQ60018ETL45 Module
Protection Features
*Inputunder-voltagelockoutdisablesconverteratlowinput voltage conditions *Outputcurrentlimitandshortcircuitprotectionprotects converter and load from permanent damage and consequent hazardous conditions *Activebackbiaslimitpreventsdamagetoconverterfrom external load induced pre-bias *Outputover-voltageprotectionprotectsloadfrom damaging voltages *Thermalshutdownprotectsconverterfromabnormal environmental conditions
Mechanical Features
*Industrystandardeighth-brickpin-outconfiguration *Openframesize:0.90"x2.3"(22.9x58.4mm) *Totalheightonly0.320"(8.13mm)L-option,permitsbetter airflow and smaller card pitch *Openframetotalweight:0.85oz(24g) *Openframeunitshaveflangedpinsdesignedto permit surface mount soldering (avoid wave solder) usingFPiPtechnique
Safety Features
*2250V,30M input-to-output isolation *Certifiedto60950-1requirementsforbasicinsulation (see Standards and Qualifications page) *RoHScompliant(seePage14)
Control Features
*On/Offcontrolreferencedtoinputside(positiveand negative logic options are available) *Remote sense for the output voltage compensates for output distribution drops *Outputvoltagetrimpermitscustomvoltagesand voltage margining
Product # PQ60018ETL45 Phone 1-888-567-9596
Contents
Mechanical Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 PQ60018ETL45 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . 4-5 PQ60-ET Family Standards and Qualifications (all output voltages) . . . . 5 PQ60018ETL45 Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9 Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Doc.# 005-2ET618F Rev. B 06/01/09
Page No.
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Page 1
Technical Specification
Mechanical Drawing - Open Frame A option
.900.022 [22,86 0,55] .600 [15,24 ] .450 [ 11,43 ] .300 [ 7,62] .150 [ 3,81 ]
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
.145 [ 3,68 ] SEE NOTE 3
87654
2.30 [ 58,4 ]
2.00 [ 50,8 ]
TOP VIEW
SIDE VIEW
.14 [ 3,6 ]
1
2
3
.300 [ 7,62] .600 [ 15,24 ] .15 [ 3,8 ]
.397[ 10,08 ] OVERALL HEIGHT
.093 [ 2,36 ] BOTTOMSIDE CLEARANCE
NOTES
1) PINS 1-3, 5-7 ARE 0.040" (1.02mm) DIA. WITH 0.080" (2.03mm) DIA. STANDOFF SHOULDERS 2) PINS 4, 8 ARE 0.062" (1.57mm) DIA. WITH 0.100" (2.54mm) DIA. STANDOFF SHOULDERS 3) OTHER PIN EXTENSION LENGTHS AVAILABLE 4) ALL PINS: MATERIAL: COPPER ALLOY FINISH: TIN-LEAD OVER NICKEL PLATE 5) UNDIMENSIONED COMPONENTS ARE SHOWN FOR VISUAL REFERENCE ONLY 6) ALL DIMENSIONS IN INCHES(mm) TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm) X.XXXIN +/-0.010 (X.XXmm +/-0.25mm) Pin 1 2 3 4 5 6 7 8 Notes: 1) 2) 3) Name Vin(+)
PIN DESIGNATIONS
Function Positive input voltage TTL input to turn converter on and off, referenced to Vin(-), with internal pull up. Negative input voltage Negative output voltage Negative remote sense(see note 1) Output voltage trim (see note 2) Positive remote sense (see note 3) Positive output voltage
ON/OFF Vin(-) Vout(-) SENSE(-) TRIM SENSE(+) Vout(+)
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.
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Doc.# 005-2ET618F Rev. B
06/01/09
Page 2
Technical Specification
Mechanical Drawing - Open Frame L option
2.30
(58.4)
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
0.450
(11.43)
2.00
(50.8)
0.14
(3.6)
0.300
(7.62)
0.15
(3.8)
Top View
1 2 3 8 7 6 5 4
0.150
(3.81)
0.600
(15.24)
0.300
(7.62)
0.900 +0.022
(22.86 +0.55)
0.320 +0.015
(8.13 +0.38)
0.600
(15.24)
Overall Height
0.145
(3.68) See Note 3
0.016 +0.015
(0.41 +0.38)
Side View
Lowest Component Load Board Flanged Pin See Note 10
Bottom Side Clearance
NOTES
1) Pins 1-3, 5-7 are 0.040" (1.02mm) diameter. with 0.080" (2.03mm) diameter standoff shoulders. 2) Pins 4 and 8 are 0.062" (1.57 mm) diameter with 0.100" (2.54 mm) diameter standoff shoulders. 3) Other pin extension lengths available. Recommended pin length is 0.03" (0.76mm) greater than the PCB thickness. 4) All Pins: Material - Copper Alloy Finish - Matte Tin over Nickel plate 5) Undimensioned components are shown for visual reference only 6) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 7) Weight: 0.85 oz (24 g) typical 8) Workmanship: Meets or exceeds IPC-A-610C Class II 9) UL/TUV standards require a clearance greater than 0.04" (1.02mm) between input and output for Basic insulation. This issue should be considered if any copper traces are on the top side of the user's board. Note that the ferrite core shown at left above is considered part of the input/primary circuit and that the two ferrite cores shown at the right above are considered part of the output/secondary circuit.
PIN DESIGNATIONS
Pin 1 2 3 4 5 Name Vin(+) ON/OFF Vin(-) Vout(-) SENSE(-) Function Positive input voltage TTL input to turn converter on and off, referenced to Vin(-), with internal pull up. Negative input voltage Negative output voltage Negative remote sense(see note 1) Output voltage trim (see note 2) Positive remote sense (see note 3) Positive output voltage
6 TRIM 7 SENSE(+) 8 Vout(+) 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.
10) The flanged pins are designed to permit surface mount soldering (allowing to avoid the wave soldering process) through the use of the flanged pin-in-paste technique.
Product # PQ60018ETL45 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2ET618F Rev. B 06/01/09 Page 3
Technical Specification
PQ60018ETL45 Electrical Characteristics
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
TA=25C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40C to +100C ambient temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
ABSOLUTE MAXIMUM RATINGS
Min.
35 -40 -55 -2 35 31.5 29.6 1.9 0 1.785 1.774 0 48 10 180
Typ.
48 32.6 30.6 2.0 46 6 60 2 30 47 1.800 +0.1\1.8 +0.2\3.6 +5 1.800 35 15 52 1.0 4.6 10 67 120 200 1000 13 200 0 87 89 2250 30 3300
Max.
100 75 100 2250 100 125 18 75 33.7 32.5 2.1 2.6 75 10 0.1 20 1.0\3.3 1.817 1.828 45 64 6.5 50 43 5 20 230 125 125 125
Units
V V V V C C V V V V V A mA mA A 2s mV mA mA A H\F F V %\mV %\mV mV V mV mV A A V A mA mF mF dB mV mV s ms ms % % % C C C V MW pF
Notes & Conditions
Continuous Continuous 100ms transient, square wave Basicinsulation,PollutionDegree2

INPUT CHARACTERISTICS
InputVoltage Non-Operating Operating OperatingTransientProtection IsolationVoltage(inputtooutput) OperatingTemperature StorageTemperature VoltageatON/OFFinputpin OperatingInputVoltageRange InputUnder-VoltageLockout Turn-OnVoltageThreshold Turn-OffVoltageThreshold LockoutVoltageHysteresis MaximumInputCurrent No-LoadInputCurrent DisabledInputCurrent InrushCurrentTransientRating ResponsetoInputTransient InputReflectedRippleCurrent InputTerminalRippleCurrent RecommendedInputFuse InputFilterComponentValues(L\C) RecommendedExternalInputCapacitance
100%Load,35Vin,nominalVout
OUTPUT CHARACTERISTICS
1000V/msinputtransient RMSthru10Hinductor;Figures13&15 RMS;Figures13&14 Fastblowexternalfuserecommended Internalvalues;seeFigureE TypicalESR0.1-0.2W;seeFigure13
DYNAMIC CHARACTERISTICS
OutputVoltageSetPoint OutputVoltageRegulation OverLine OverLoad OverTemperature TotalOutputVoltageRange OutputVoltageRippleandNoise1 Peak-to-Peak RMS OperatingOutputCurrentRange OutputDCCurrent-LimitInception OutputDCCurrent-LimitShutdownVoltage Back-DriveCurrentLimitwhileEnabled Back-DriveCurrentLimitwhileDisabled MaximumOutputCapacitanceElectrolytic MaximumOutputCapacitanceCeramic InputVoltageRippleRejection OutputVoltageduringLoadCurrentTransient ForaStepChangeinOutputCurrent(0.1A/s) ForaStepChangeinOutputCurrent(1A/s) Settling Time Turn-OnTransient Turn-OnTime RestartInhibitTime OutputVoltageOvershoot 100%Load 50%Load
Oversample,line,load,temperature&life 20MHzbandwidth;Figures 13&16 FullLoad;seeFigures 13&16 FullLoad;seeFigures 13&16 Subjecttothermalderating;Figures5-8 OutputVoltage10%Low Negativecurrentdrawnfromoutput Negativecurrentdrawnfromoutput 1.8Voutat45AResistiveLoad 1.8Voutat45AResistiveLoad 120Hz;Figure20 50%to75%to50%Ioutmax;Figure11 50%to75%to50%Ioutmax;Figure12 Towithin1%Voutnom Fullload,Vout=90%nom.;Figures9&10 -40Cto+125C;FigureF Noloadcapacitance,Iout=0A Figures1-4 Figures1-4 Packageratedto150C ULratedmaxoperatingtemp130C SeeFigures5-8forderatingcurves
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
ISOLATION CHARACTERISTICS
SemiconductorJunctionTemperature BoardTemperature TransformerTemperature IsolationVoltage(dielectricstrength) IsolationResistance IsolationCapacitance2
Note1:Outputvoltageripplecanexceedmaximumspecificationduringstartupwhenoutputvoltageislessthan0.7V.Additionaloutputcapacitancewillmitigatethis startupripplebehavior.Forapplicationsrequiringreducedoutputvoltagerippleandnoise,consultSynQorapplicationssupport(e-mail:support@synqor.com) Note2:Highervaluesofisolationcapacitancecanbeaddedexternaltothemodule.
Product # PQ60018ETL45
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Doc.# 005-2ET618F Rev. B
06/01/09
Page 4
Technical Specification
PQ60018ETL45 Electrical Characteristics (Continued)
Parameter P

FEATURE CHARACTERISTICS
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
Min.
300 -2 2.4 2.4 -2 -20 117
Typ.
333 5 10 133 120 10 2.42 2.27
Max.
360 0.8 18 18 0.8 6 +10 +10 142
Units
kHz V V V V V kW % % % C C
Notes & Conditions
RELIABILITY CHARACTERISTICS
SwitchingFrequency ON/OFFControl(OptionP) Off-StateVoltage On-StateVoltage ON/OFFControl(OptionN) Off-StateVoltage On-StateVoltage ON/OFFControl(EitherOption) Pull-UpVoltage Pull-UpResistance OutputVoltageTrimRange OutputVoltageRemoteSenseRange OutputOver-VoltageProtection Over-TemperatureShutdown Over-TemperatureShutdownRestartHysteresis CalculatedMTBF(Telcordia) CalculatedMTBF(MIL-217) FieldDemonstratedMTBF
FiguresA&B MeasuredacrossPins8&4;FigureC MeasuredacrossPins8&4 Overfulltemprange;%ofnominalVout AveragePCBTemperature
106 Hrs. TR-NWT-000332;80%load,300LFM,40oC Ta 106 Hrs. MIL-HDBK-217F;80%load,300LFM,40oC Ta 106 Hrs. See our website for latest values
PQ60-ET Family Standards and Qualifications (all output voltages)
Parameter
STANDARDS COMPLIANCE UL/cUL 60950-1 EN60950-1 Needle Flame Test (IEC 695-2-2) IEC 61000-4-2 File # E194341, Basic insulation Certified by TUV Test on entire assembly; board & plastic components UL94V-0 compliant ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance)
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
# Units
32 5 5 10 5 5 5
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
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Doc.# 005-2ET618F Rev. B
06/01/09
Page 5
Technical Specification
100 95 90 94 93 92
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
Efficiency (%)
80 75 70 65 60 0 5 10 15 20 25 30 35 40 45 35 Vin 48 Vin 75 Vin
Efficiency (%)
85
91 90 89 88 87 86 100 200 300 400 25 C 40 C 55 C
Load Current (A)
Air Flow (LFM)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25C.
Figure 2: Efficiency at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25C, 40C, and 55C (nominal input voltage).
8 7
14 12
Power Dissipation (W)
Power Dissipation (W)
10 8 6 4 2 0 0 5 10 15 20 25 30 35 40 45 35 Vin 48 Vin 75 Vin
6 5 4 3 2 1 100 200 300 400 25 C 40 C 55 C
Load Current (A)
Air Flow (LFM)
Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25C.
Figure 4: Power dissipation at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25C, 40C, and 55C (nominal input voltage).
50
40
Iout (A)
30
20 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 10 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 0 25 40 55 70 85
Ambient Air Temperature (C)
Figure 5: Maximum output power-derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing from pin 3 to pin 1(nominal input voltage).
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Figure 6: Thermal plot of an open frame converter at 36.5 amp load current (65.6W) with 70C air flowing at the rate of 200 LFM. Air is flowing across the converter from 3 to pin 1 (nominal input voltage).
Doc.# 005-2ET618F Rev. B 06/01/09 Page 6
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Technical Specification
50
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
40
Iout (A)
30
20 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 10 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 0 25 40 55 70 85
Ambient Air Temperature (C)
Figure 7: Maximum output power derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing across the converter from pin input to output (nominal input voltage).
Figure 8: Thermal plot of an open frame converter at 35.6 amp load current (64.0W) with 70C air flowing at the rate of 200 LFM. Air is flowing across the converter from input to output (nominal input voltage).
Figure 9: Turn-on transient at full load (resistive load) (5 ms/div). Load cap: 10 uF, 100 mW ESR tantalum capacitor and 1 uF ceramic capacitor. Input voltage pre-applied. Ch 1: Vout (500 mV/div), Ch 2: ON/OFF input (5 V/div).
Figure 10: Turn-on transient at zero load (5 ms/div). Load cap: 10 uF, 100 mW ESR tantalum capacitor and 1 uF ceramic capacitor. Ch 1: Vout (500 mV/div), Ch 2: ON/OFF input (5 V/div).
Figure 11: Output voltage response to step-change in load current (50%75%-50% of Iout(max); dI/dt = 0.1A/s). Load cap: 10F, 100 mW ESR tantalum cap and 1F ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout (20A/div).
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Figure 12: Output voltage response to step-change in load current (50%75%-50% of Iout(max): dI/dt = 1A/s). Load cap: 470F, 30 mW ESR tantalum cap and 1F ceramic cap. Ch 1: Vout (200mV/div), Ch 2: Iout (20A/div).
Doc.# 005-2ET618F Rev. B 06/01/09 Page 7
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Technical Specification
See Fig. 15
source impedance
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
10 H
See Fig. 14 See Fig. 16
iS
VSOURCE
iC
DC/DC Converter 1 F
VOUT
15 F,
electrolytic capacitor
47F, <1W ESR
ceramic 100mW ESR capacitor tantalum capacitor
Figure 13: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 14), Input Reflected Ripple Current (Figure 15) and Output Voltage Ripple (Figure 16).
Figure 14: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 10H source impedance and 47F electrolytic capacitor (50 mA/div). See Figure 13.
Figure 15: Input reflected ripple current, is, through a 10 H source inductor, using a 47F electrolytic input capacitor (5mA/div). See Figure 13.
Figure 16: Output voltage ripple at nominal input voltage and rated load current (20 mV/div). Load capacitance: 1F ceramic capacitor and 15F tantalum capacitor. Bandwidth: 20 MHz. See Figure 13.
12 11 10 9
Vout Trim-up (%)
8 7 6 5 4 3 2 1 0 40.0 39.5 39.0 38.5 38.0 37.5 37.0 36.6 36.0 35.5 35.0 100% Load 50% Load 0% Load
Input Voltage (V)
Figure 17: Output voltage response to step-change in input voltage (48V to 75V), at 45A load current. Load cap: 10F tantalum capacitor and 1uF ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Vin (20V/div).
Product # PQ60018ETL45 Phone 1-888-567-9596
Figure 18: Achievable trim-up percentage vs. input voltage at 0%, 50% and full load. Vin=35-40V.
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Doc.# 005-2ET618F Rev. B
06/01/09
Page 8
Technical Specification
1 0 -10
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
0.1
Forward Transmission (dB)
Output Impedance (ohms)
-20 -30 -40 -50 -60 -70 -80 -90 -100 35 Vin 48 Vin 75 Vin 10 100 1,000 10,000 100,000
0.01
0.001
35 Vin 48 Vin 75 Vin
0.0001 10 100 1,000 10,000 100,000
Hz
Hz
Figure 19: Magnitude of incremental output impedance (Zout = vout/iout) for minimum, nominal, and maximum input voltage at full rated power.
Figure 20: Magnitude of incremental forward transmission (FT = vout/vin) for minimum, nominal, and maximum input voltage at full rated power.
5
100
-5
Reverse Transmission (dB)
-15
Input Impedance (ohms)
10
-25
-35 35 Vin -45 48 Vin 75 Vin -55 10 100 1,000 10,000 100,000
1 35 Vin 48 Vin 75 Vin 0.1 10 100 1,000 10,000 100,000
Hz
Hz
Figure 21: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power.
Figure 22: Magnitude of incremental input impedance (Zin = vin/iin) for minimum, nominal, and maximum input voltage at full rated power.
2
1.5
Output Voltage (V)
1
0.5
35 Vin 48 Vin 75 Vin
0 0 10 20 30 40 50 60
Load Current (A)
Figure 23: Output voltage vs. load current showing typical current limit curves and converter shutdown points.
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Technical Specification
BASICOPERATIONANDFEATURES
The single stage power converter switches at a fixed frequency forpredictableEMIperformance.Rectificationofthetransformer's output is accomplished with synchronous rectifiers. These devices, whichareMOSFETswithaverylowon-stateresistance,dissipate far less energy than Schottky diodes. This is the primary reason that the PowerQor converter has such high efficiency, even at very low output voltages and very high output currents. Dissipation throughout the converter is so low that it does not require a heatsink for operation. Since a heatsink is not required, the PowerQor converter does not need a metal baseplate or potting material to help conduct the dissipated energy to the heatsink. The PowerQor converter can thus be built more simply and reliably using high yield surface mount techniques on a PCB substrate. The PowerQor series of eighth-brick, quarter-brick and half-brick converters uses the industry standard footprint and pin-out configuration.
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter'soutputpinstotheload. Pin 7 should be connected to Vout(+) and Pin 5 should be connected to Vout(-) at the point on the board where regulation is desired. A remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, that is
[Vout(+)-Vout(-)] - [Vsense(+)-Vsense(-)] <
SenseRange%xVout
Pins7and5mustbeconnectedforproperregulationoftheoutputvoltage.Iftheseconnectionsarenotmade,theconverterwill deliver an output voltage that is slightly higher than its specified value. Note:theoutputover-voltageprotectioncircuitsensesthevoltage across the output (pins 8 and 4) to determine when it should trigger,notthevoltageacrosstheconverter'ssenseleads(pins7and 5). Therefore, the resistive drop on the board should be small enough so that output OVP does not trigger, even during load transients. OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications. To decrease the output voltage, the user should connect a resistor betweenPin6andPin5(SENSE(-)input).Foradesireddecrease of the nominal output voltage, the value of the resistor should be
CONTROLFEATURES
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(-).Thereare two versions of the converter that differ by the sense of the logic usedfortheON/OFFinput. In the positive logic version, the ON/OFF input is active high (meaning that a high turns the converter on).Inthenegativelogic version, the ON/OFF signal is active low (meaning that a low turns the converter on). Figure A details five possible circuits for drivingtheON/OFFpin.FigureBisadetailedlookoftheinternal ON/OFFcircuitry.
ON/OFF ON/OFF ON/OFF
Rtrim-down =
where
(511) -10.22 D%
(kW)
D% =
Vnominal-Vdesired Vnominal
x100%
Vin(_) Remote Enable Circuit
Vin(_) NegativeLogic (Permanently Enabled) ON/OFF
TTL/ CMOS
Vin(_) Positive Logic (Permanently Enabled) ON/OFF ON/OFF 10k 50k
5V
5V
TTL
100pF
Vin(_) OpenCollectorEnableCircuit
Vin(_) Direct Logic Drive
Vin(_)
Figure A: Various circuits for driving the ON/OFF pin.
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Figure B: Internal ON/OFF pin circuitry
Doc.# 005-2ET618F Rev. B 06/01/09 Page 10
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
Input: Output: Current: Package:
PROTECTIONFEATURES
35-75 V 1.8 V 45 A Eighth-brick
Rtrim-up =
where
(
5.11VOUT(100+D%) _ 511 _
1.225D%
D%
10.22
)
(kW)
VOUT=NominalOutputVoltage Figure C graphs the relationship between the trim resistor value and Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down.
10,000
Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the applicationnotetitled"InputSystemInstability".Thelockoutcircuitryisa comparatorwithDChysteresis.Whentheinputvoltageisrising,it mustexceedthetypicalTurn-OnVoltageThresholdvalue(listedon thespecificationpage)beforetheconverterwillturnon.Oncethe converter is on, the input voltage must fall below the typical TurnOffVoltageThresholdvaluebeforetheconverterwillturnoff. 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 impedance 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 turns on and off at a 5 Hz (nominal) frequency with a 5% duty cycle until the short circuit condition is removed. This prevents excessive heating of the converter or the load board. Output Over-Voltage Limit: If the voltage across the output 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)areleaseofacurrentlimitcondition. 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 thermal 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.
Trim Resistance (kOhms)
1,000
100
10
1 0 2 4 6 8 10 12 14 16 18 20
% increase Vout
% decrease Vout
Figure C: Trim Graph for 1.8Vout 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 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.
Product # PQ60018ETL45
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2ET618F Rev. B
06/01/09
Page 11
Technical Specification
APPLICATIONCONSIDERATIONS
Input System Instability: This condition can occur because any DC/DC converter appears incrementally as a negative resistance load. A detailed application note titled "Input System Instability" is available on the SynQor website which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. Application Circuits:FigureDbelowprovidesatypicalcircuit diagram which details the input filtering and voltage trimming. Input Filtering and External Capacitance:FigureEbelow provides a diagram showing the internal input filter components. This filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of an external input electrolytic capacitor. The recommended external input capacitance is specified in the "Input Characteristics" section. More detailed information is available in the application note titled "EMI Characteristics"ontheSynQorwebsite.
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
Startup/Restart Inhibit Period: The Restart Inhibit Period ensures that the converter will remain off for approximately 200msonceitisshutdown.Whenanoutputshortispresent,this generates a 5Hz "hiccup mode," which prevents the converter fromoverheating.Inall,therearefivewaysthattheconvertercan beshutdownthatinitiateaRestartInhibitPeriod: *InputUnder-VoltageLockout *OutputOver-VoltageProtection *OverTemperatureShutdown *CurrentLimit *TurnedoffbytheON/OFFinput Figure F shows four turn-on scenarios, where a Restart Inhibit Period is initiated at t1, t2, and t3: A Startup Inhibit Period is initiated when the input voltage is brought up from zero voltage during initial startup, beginning as the input voltage reaches approximately 10V. At the end of the Startup Inhibit Period (typically 10mS), if the ON/OFF pin has been active for at least 1ms, and the input voltage is above theUnder-VoltageLockoutthreshold,theoutputturnsonwiththe TypicalTurn-OnTime.Thisisshownattimet0.
Vin(+) External Input Filter
Electrolytic Capacitor
Vout(+) Vsense(+) Rtrim-up
or
Vin
47F
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).
Product # PQ60018ETL45 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2ET618F Rev. B 06/01/09 Page 12
Technical Specification
At time t1,theinputvoltagefallsbelowtheInputUnder-Voltage Lockout threshold. This disables the unit and initiates a Restart Inhibit Period. During the Restart Inhibit Period, if the input voltage again exceeds the UVLO threshold, the unit cannot be enabledagainuntiltheRestartInhibitPeriodhaselapsed.Once thisoccurs,theoutputturnsonwiththeTypicalTurn-OnTime. At time t2, the ON/OFF pin disables the unit and initiates a RestartInhibitPeriod.DuringtheRestartInhibitPeriod,iftheON/ OFFpinisagainactivated,theunitcannotbeenabledagainuntil theRestartInhibitPeriodhaselapsed.Oncethisoccurs,theoutput turnsonwiththeTypicalTurn-OnTime.
Input: Output: Current: Package:
35-75 V 1.8 V 45 A Eighth-brick
WhentheON/OFFpingoeshighaftert3,andtheRestartInhibit Period has elapsed, the output turns on approximately 1.6ms after theON/OFFpinisactivated,withtheTypicalTurn-OnTime. If the Under-Voltage Lockout threshold has not been satisfied at theendofeitherInhibitPeriod,theunitwillremaindisableduntil theinputvoltageexceedstheUVLOthreshold.Oncethisoccurs, theoutputturnsonwiththeTypicalTurn-OnTime. If the ON/OFF pin is activated after either Inhibit Period has elapsed, the output will turn on approximately 1.6ms after the ON/OFFpinisactivated,withtheTypicalTurn-OnTime.
Vin
Under-Voltage LockoutTurn-On Threshold
ON/OFF
(pos logic)
ON
OFF ON
OFF
ON
Vout
(typical start-up inhibit period)
10ms
(typical restart inhibit period)
(typical turn on time)
15ms
200ms
200ms
200ms
t0
t1
t2
t3
t
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # PQ60018ETL45
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2ET618F Rev. B
06/01/09
Page 13
Technical Specification
PART NUMBERING SYSTEM
The part numbering system for SynQor's dc-dc converters follows the format shown in the example below.
PQ 6 0 0 1 8 E T L 4 5 N N S - G 6/6 RoHS Options (see OrderingInformation) OutputCurrent Thermal Design Performance Level Package Size OutputVoltage InputVoltage ProductFamily
Thermal Design A - Open Frame L - Low Profile Model Number PQ60018ETw45xyz PQ60025ETw35xyz PQ60033ETw30xyz
Input: Output: Current: Package:
ORDERING INFORMATION
35-75 V 1.8 V 45 A Eighth-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.
Continuous Input Output Voltage Maximum Output Current Voltage 35-75V 1.8 V 45 A 35-75V 2.5 V 35 A 35-75V 3.3 V 30 A
The following options must be included in place of the w x y z spaces in the model numbers listed above.
Options Description: w x y z Enable Logic P - Positive N - Negative Pin Length K - 0.110" N - 0.145" R - 0.180" Y - 0.250" 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.
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
SynQor holds the following patents, one or more of which 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 three (3) 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 # PQ60018ETL45
www.synqor.com
Doc.# 005-2ET618F Rev. B
06/01/09
Page 14

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