Technical Specification IQ24500HEx08 18-36 V Input 50 V Output 8 A Current 2250 Vdc Isolation Half-brick DC-DC Converter The IQ24500HEx08 InQor™ Exa converter is an isolated, fixed switching frequency DC-DC converter that uses synchronous rectification to achieve extremely high efficiency and power density. The 24 Vin modules feature 2,250 Vdc isolation and low common mode noise. The Exa series converters offer industry leading usable output power for any standard “half-brick” module. RoHS compliant (see last page). Operational Features •Ultra-high efficiency, 94% at full rated load current, 95% at half rated load current •Delivers up to 8 A of output current (400 W) •Wide input voltage range: 18 – 36 V, with 50 V 100 ms input voltage transient capability •Fixed frequency switching provides predictable EMI performance •No minimum load requirement means no preload resistors required •Wide output voltage trim range (-50% to +10%) Mechanical Features • Industry standard half-brick pin-out configuration • Brick size: 2.39" x 2.49" (63.1 x 60.6 mm) • Total height only 0.512" (13 mm) • Total weight: 4.3 oz. (123 grams) Control Features • On/Off control referenced to input side IQ24500HEC08 Module Protection Features •Input under-voltage lockout disables converter at low input voltage conditions •Output current limit and short circuit protection protects converter and load from damage and consequent hazardous conditions •Active back bias limit provides smooth startup with external load induced pre-bias •Latching output over-voltage protection protects load from damaging voltages •Thermal shutdown protects converter from abnormal environmental conditions Safety Features Contents • 2250 V, 30 MΩ input-to-output isolation • UL 60950-1:2003, basic insulation • CAN/CSA-C22.2 No. 60950-1:2003 • EN60950-1:2001 • CE Marked • RoHS compliant (see Page 12) Product # IQ24500HEx08 Phone 1-888-567-9596 Page No. 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 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 1 18-36 V 50 V 8 A (400 W) Half-brick Input: Output: Current: Package: Technical Specification Mechanical Diagram 2.486 2.00 1.400 1.000 ±.020 [ 63.14 ±0.5 ] [ 50.8 ] [ 35.56 ] [ [ 25.4 ] .700 [ 17.78 ] .400 [ 10.16 ] +.002 -.005 +0.05 13 -0.12 OVERALL HEIGHT .512 .243 ±.020 [ 6.17 ±0.5 ] 9 8 6 7 ] .163 [ 4.14 ] 5 .243 ±.020 [ 6.17 ±0.5 ] 2.386 ±.020 [ 60.6 ±0.5 ] TOP VIEW 1.90 [ 48.3 ] SIDE VIEW 1.90 [ 48.3 ] .233 ±.020 [ 5.92 ±0.5 ] 1 2 4 3 .543 ±.020 [ 13.79 ±0.5 ] .400 [ 10.16 ] 1.00 [ 25.4 ] 1.400 THRU HOLE M3 (SEE NOTE 8) STANDOFFS (4) +.007 -.010 +0.17 0.69 -0.25 BOTTOMSIDE CLEARANCE .027 [ ] [ 35.56 ] PIN DESIGNATIONS NOTES Pin Name Function 1 Vin(+) Positive input voltage 2 ON/OFF TTL input to turn converter on and off, referenced to Vin(–), with internal pull up. 3 Reserved Not Connected 4 Vout(–) Negative output voltage 5 Vout(–) 6) UNDIMENSIONED COMPONENTS ARE SHOWN FOR VISUAL REFERENCE ONLY 6 SENSE(–) Negative output voltage Negative remote sense1 7 TRIM 7) WEIGHT: 139g/4.9oz 8 SENSE(+) Positive remote sense3 8) THREADED OR NON-THREADED OPTIONS AVAILABLE 9 Vout(+) Positive output voltage 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 9) ALL DIMENSIONS IN INCHES(mm) TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm X.XXXIN +/-0.010 (X.XXmm +/-0.25mm) Product # IQ24500HEx08 Phone 1-888-567-9596 Output voltage trim2 Notes: 1) SENSE(–) should be connected to Vout(–) either remotely or at the converter. 2) Leave TRIM pin open for nominal output voltage. 3) SENSE(+) should be connected to Vout(+) either remotely or at the converter. www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 2 Input: Output: Current: Package: Technical Specification 18-36 V 50 V 8 A (400 W) Half-brick IQ24500HEx08 ELECTRICAL CHARACTERISTICS TA=25°C, airflow rate=300 LFM, Vin=24Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient temperature with appropriate power derating. Specifications subject to change without notice. Parameter ABSOLUTE MAXIMUM RATINGS Input Voltage Non-Operating Operating Operating Transient Protection Isolation Voltage (input to output) Operating Temperature Storage Temperature Voltage at ON/OFF input pin INPUT CHARACTERISTICS Operating Input Voltage Range Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Voltage Hysteresis Maximum Input Current No-Load Input Current Disabled Input Current Response to Input Transient Input Reflected Ripple Current Input Terminal Ripple Current Recommended Input Fuse Input Filter Component Values (L\C) Recommended External Input Capacitance OUTPUT CHARACTERISTICS Output Voltage Set Point Output Voltage Regulation Over Line1 Over Load1 Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise2 Peak-to-Peak RMS Operating Output Current Range Output DC Current-Limit Inception Output DC Current-Limit Shutdown Voltage3 Back-Drive Current Limit while Enabled Back-Drive Current Limit while Disabled Maximum Output Capacitance DYNAMIC CHARACTERISTICS Output Voltage during Load Current Transient For a Step Change in Output C urrent (0.1 A/µs) For a Step Change in Output Current (5 A/µs) Settling Time Turn-On Transient Turn-On Time Output Voltage Overshoot EFFICIENCY 100% Load 50% Load TEMPERATURE LIMITS FOR POWER DERATING CURVES Semiconductor Junction Temperature Board Temperature Transformer Temperature ISOLATION CHARACTERISTICS Isolation Voltage (dielectric strength) Isolation Resistance Isolation Capacitance4 Note Note Note Note 1: 2: 3: 4: Min. Typ. Max. Units Notes & Conditions -40 -55 -2 50 40 50 2250 100 125 18 V V V V °C °C V Continuous Continuous 100 ms transient, square wave Basic insulation, Pollution Degree 2 18 24 36 V 50 V transient for 100 ms 16.5 15.0 1.0 17.0 15.5 1.5 300 100 1.5 5 150 0.34\23 470 17.5 16.0 2.0 30 400 125 20 40 V V V A mA mA V mA mA A µH\µF µF 48.60 50.00 51.35 V 48.5 0 9 1 0 +0.25\125 +0.25\125 +0.380 200 50 10 20 3 3 +1.000 51.45 250 65 8 11 4 7 1 %\mV %\mV V V mV mV A A V A mA mF 2 2 8 V V ms 50% to 75% to 50% Iout max, 200 µF load cap “ To within 1% Vout nom 24 35 40 2 ms % Full load, ON/OFF to Vout=90% nom. No load, 1mF load cap 94 95 % % Figures 1 & 2 Figures 1 & 2 125 125 125 °C °C °C Package rated to 150°C UL rated max operating temp 130°C 2250 30 1000 V MW pF 100% Load, 18 Vin, trimmed up 10% 0.25 V/µs input transient RMS thru 3.3 µH inductor RMS Fast blow external fuse recommended Internal values; see Figure E Typical ESR 0.1-0.2 W Over sample, line, load, temperature & life 20 MHz bandwidth Full Load Full Load Subject to thermal derating Output Voltage 10% Low Negative current drawn from output source Negative current drawn from output source 8 A Resistive Load Line and load regulation is limited by duty cycle quantization and does not indicate a shift in the internal voltage reference. For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected]). If the output voltage falls below the Output DC Current Limit Shutdown Voltage for more than 50ms, then the unit will enter into hiccup mode, with a 500 ms off-time. Higher values of isolation capacitance can be added external to the module. Product # IQ24500HEx08 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 3 Input: Output: Current: Package: Technical Specification 18-36 V 50 V 8 A (400 W) Half-brick ELECTRICAL CHARACTERISTICS (Continued) Parameter P FEATURE CHARACTERISTICS Switching Frequency Regulation Stage Switching Frequency Isolation Stage ON/OFF Control (Option N) Off-State Voltage On-State Voltage ON/OFF Control ON/OFF Control Hysteresis Pull-Up Voltage Pull Up Resistance Output Voltage Trim Range Output Over-Voltage Protection Over-Temperature Shutdown Over-Temperature Shutdown Restart Hysteresis RELIABILITY CHARACTERISTICS Calculated MTBF (Telcordia) Calculated MTBF (MIL-217) Field Demonstrated MTBF Min. Typ. Max. Units Notes & Conditions 232 116.0 235 117.5 237 118.5 kHz kHz 4.0 -2 4.75 -50 113 1.5 5.00 10 118 120 10 18 1.0 5.25 +10 123 V V V V kW % % °C °C TBD TBD Over sample, temp & life Over sample, temp & life Measured across Pins 9 & 5; see trim section Over full temp range; % of nominal Vout Average PCB Temperature 106 Hrs. TR-NWT-000332; 80% load,300LFM, 40ºC Ta 106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40ºC Ta 106 Hrs. See website for details Standards compliance and Qualification Testing Parameter Notes & Conditions STANDARDS COMPLIANCE UL 60950-1:2003 Basic Insulation CAN/CSA-C22.2 No. 60950-1:2003 EN60950-1:2001 CE Marked 2006/95/EC Low Voltage Directive IEC 61000-4-2 ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance) 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 # Units Test Conditions QUALIFICATION TESTING Life Test 32 95% rated Vin and load, units at derating point, 1000 hours Vibration 5 10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis Mechanical Shock 5 100g minimum, 2 drops in x and y axis, 1 drop in z axis Temperature Cycling 10 -40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles Power/Thermal Cycling 5 Toperating = min to max, Vin = min to max, full load, 100 cycles Design Marginality 5 Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load Humidity 5 85 °C, 85% RH, 1000 hours, continuous Vin applied except 5 min/day Solderability Product # IQ24500HEx08 15 pins Phone 1-888-567-9596 MIL-STD-883, method 2003 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 4 Input: Output: Current: Package: Technical Specification 100 18-36 V 50 V 8 A (400 W) Half-brick 60 95 50 Power Dissipation (W) Efficiency (%) 90 85 80 75 70 18 Vin 24 Vin 36 Vin 65 40 30 20 18 Vin 24 Vin 10 36 Vin 0 60 0 1 2 3 4 5 6 7 0 8 1 2 3 Load Current (A) Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 5 6 7 8 Figure 2: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 9 9 8 8 7 7 6 6 Iout (A) Iout (A) 4 Load Current (A) 5 4 3 5 4 3 400 LFM (2.0 m/s) 2 400 LFM (2.0 m/s) 2 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 1 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 1 100 LFM (0.5 m/s) 100 LFM (0.5 m/s) 0 0 25 40 55 70 85 25 Ambient Air Temperature (°C) 40 55 70 85 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) 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) Product # IQ24500HEx08 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 5 Input: Output: Current: Package: Technical Specification Figure 7: Output voltage response to step-change in load current (50%-75%-50% of Iout(max); dI/dt = 0.1 A/µs; 1 ms/div). Load cap: 1 uF ceramic and 330 µF, 15 mW ESR electrolitic capacitors. Top trace: Vout (1 V/div). Bottom trace: Iout (5 A/div). Figure 11 3.3 µH source impedance Figure 8: Output voltage response to step-change in load current (50%-75%-50% of Iout(max): dI/dt = 5 A/µs; 2 ms/div). Load cap: 330 µF, 15 mW ESR electrolytic capacitor. Top trace: Vout (1.0 V/div). Bottom trace: Iout 10 A/div). Figure 10 Figure 12 iS VSOURCE 18-36 V 50 V 8 A (400 W) Half-brick iC 470 µF, 0.2W ESR electrolytic capacitor DC-DC Converter VOUT 1 µF ceramic capacitor 100 µF, 10mW ESR electrolytic 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 µH source impedance and 470 µF electrolytic capacitor (200 mA/div; 2 µs/div). See Figure 9. Figure 11: Input reflected ripple current, is, through a 3.3 µH source inductor, using a 470 µF input capacitor, at nominal input voltage and rated load current (10 mA/div; 2 µs/div). See Figure 9. Figure 12: Output voltage ripple at nominal input voltage and rated load current (50 mV/div; 2 µs/div). Load capacitance: 1 µF ceramic capacitor and 100 µF electrolytic capacitor. Bandwidth: 20 MHz. See Figure 9. Product # IQ24500HEx08 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 6 Input: Output: Current: Package: Technical Specification Figure 13: Output voltage response to step-change in input voltage (18 V to 36 V in 200 µs; 400 µs/div). Load cap: 470 µF, 15 mW ESR electrolytic capacitor. Top trace: Vin (5.0 V/div). Bottom trace: Vout (1.0 V/div), at zero load current. 18-36 V 50 V 8 A (400 W) Half-brick 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. 61 57 Output Voltage (V) 53 49 45 41 37 33 18 Vin 29 24 Vin 25 36 Vin 21 -4 -2 0 2 4 6 8 10 12 Load Current (A) Figure 15: Output voltage vs. load current showing typical current limit curves and OVP shutdown point. Product # IQ24500HEx08 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 7 Input: Output: Current: Package: Technical Specification 18-36 V 50 V 8 A (400 W) Half-brick BASICOPERATIONANDFEATURES CONTROLFEATURES Theconverterseriesusesatwo-stagepowerconversiontopology. Thefirststagekeepstheoutputvoltageconstantovervariationsin line,load,andtemperature.Thesecondstageusesatransformer toprovidethefunctionsofinput/outputisolationandvoltagestepdowntoachievethelowoutputvoltagerequired. 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(-). 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 Vin(_) Vin(_) RemoteEnableCircuit 5V ON/OFF Vin(_) Vin(_) DirectLogicDrive Figure A: Various circuits for driving the ON/OFF pin. Product # IQ24500HEx08 Pin8shouldbeconnectedtoVout(+)andPin6shouldbeconnectedtoVout(-)atthepointontheboardwhereregulationisdesired. If these connections are not made, the converter will deliver an outputvoltagethatisslightlyhigherthanitsspecifiedvalue. 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. CMOS OpenCollectorEnableCircuit REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’soutputpinstotheload. Note:Theoutputover-voltageprotectioncircuitsensesthevoltage acrossthesenseleads(pins8and6)todeterminewhenitshould trigger,notthevoltageacrosstheconverter’soutputpins(pins9 and5). NegativeLogic (PermanentlyEnabled) ON/OFF The ON/OFF signal is active low (meaning that a low voltage turnstheconverteron).FigureAdetailsfourpossiblecircuitsfor drivingtheON/OFFpin. Phone 1-888-567-9596 Todecreasetheoutputvoltage,theusershouldconnectaresistor betweenPin7(TRIM)andPin6(SENSE(–)input).Foradesired decreaseofthenominaloutputvoltage,thevalueoftheresistor shouldbe: Rtrim-down= ( ) 100% _ 2 kW ∆ where www.synqor.com ∆% = Vnominal–Vdesired x100% Vnominal Doc.# 005-IHE2450 Rev. C 03/31/09 Page 8 Input: Output: Current: Package: Technical Specification Toincreasetheoutputvoltage,theusershouldconnectaresistor betweenPin7(TRIM)andPin8(SENSE(+)input).Foradesired increase of the nominal output voltage, the value of the resistor shouldbe Rtrim-up Vnominal –2 ( ) xV 1.225 = DES+VNOM kW VDES–VNOM FigureBgraphstherelationshipbetweenthetrimresistorvalue, Rtrim-upandRtrim-down,showingthetotalrangetheoutputvoltagecanbetrimmedupordown. 100,000.0 100,000.0 Trim Resistance Resistance (kOhms) (kOhms) Trim 10,000.0 10,000.0 18-36 V 50 V 8 A (400 W) Half-brick PROTECTIONFEATURES 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. 1,000.0 1,000.0 100.0 100.0 10.0 1.0 0.1 0.0 0 5 10 15 20 25 % Increase in Vout 30 30 35 35 40 40 45 45 50 50 Decrease in in Vout Vout % Decrease Figure 50 Vout Vout module module FigureB: B:Trim TrimGraph Graph for for 28 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. 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*. 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 Input: Output: Current: Package: Technical Specification APPLICATIONCONSIDERATIONS Input System Instability:Thisconditioncanoccurbecause any DC-DC converter appears incrementally as a negative resistanceload.Adetailedapplicationnotetitled“InputSystem Instability”isavailableontheSynQorwebsitewhichprovides anunderstandingofwhythisinstabilityarises,andshowsthe preferredsolutionforcorrectingit. 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. 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. Vin(+) Vin External Input Filter Vout(+) Vsense(+) Electrolytic Capacitor ON/OFF Trim Vsense(_) Vin(_) Rtrim-up or Rtrim-down Cload Iload Vout(_) 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 # IQ24500HEx08 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 10 Input: Output: Current: Package: 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: 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 ºC. As long as the user’s thermal system keeps TB < 100 ºC, 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 ºC. 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. 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. 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. For convenience, Figures 3 and 4 provide Power derating curves for an encased converter without a heatsink and with a typical heatsink. max Pdiss = 100 ºC - TA RTHBA Vin Under-Voltage Lockout TurnOn Threshold ON/OFF (neg logic) ON OFF ON Vout OFF ON 9ms (typical turn on time) 200ms (typical start-up inhibit period) t0 200ms 200ms t1 t t2 Figure F: Startup Inhibit Period (turn-on time not to scale) Product # IQ24500HEx08 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 11 Input: Output: Current: Package: Technical Specification 18-36 V 50 V 8 A (400 W) Half-brick PART NUMBERING SYSTEM ORDERING INFORMATION The part numbering system for SynQor’s dc-dc converters follows the format shown in the example below. 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. I Q 2 4 5 00 H E C 0 8 N R S -G 6/6 RoHS Options (see Ordering Information) Model Number Input Voltage Output Voltage Max Output Current IQ24280HEw14NRS-G 18 - 36 V 28 V 14 A IQ24500HEw08NRS-G 18 - 36 V 50 V 8A Output Current Thermal Design Performance Level Package Size The following options must be included in place of the w x y z spaces in the model numbers listed above. Output Voltage Input Voltage Options Description: w x y z Product Family Thermal Design 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. 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 [email protected]. C - Encased with Threaded Baseplate D - Encased with Non-Threaded Baseplate Enable Logic Pin Style Feature Set N - Negative R - 0.180" S - Standard 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 might apply to this product: 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: Product # IQ24500HEx08 978-849-0600 888-567-9596 978-849-0602 [email protected] 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. www.synqor.com Doc.# 005-IHE2450 Rev. C 03/31/09 Page 12