Technical Specification IQ24280HZC18 18-36 V Input 28 V Output 18 A Current 2250 Vdc Isolation Half-brick DC-DC Converter The IQ24280HZC18 InQor™ Zeta 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 Zeta series converters offer industry leading useable output power for any standard “half-brick” module. RoHS compliant. IQ24280HZC18 Module Operational Features •Ultra-high efficiency, 93% at full rated load current, 95% at half rated load current •Delivers up to 18 A of output current (504 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 +20%) 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 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 Product # IQ24280HZC18 Phone 1-888-567-9596 Safety Features • 2250 V, 30 MW input-to-output isolation provides input/output ground separation • UL/cUL 60950-1 recognized (US & Canada), insulation rating • TUV certified to EN60950-1 • Meets 72/23/EEC and 93/68/EEC directives which facilitates CE Marking in user’s end product • Board and plastic components meet UL94V-0 flammability requirements www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 1 Input: Output: Current: Package: Technical Specification 18-36 V 28 V 18 A (504 W) Half-brick MECHANICAL DIAGRAM 2.49 (63.1) 2.00 (50.8) 1.400 (35.56) 0.24 1.000 (25.40) 0.700 (17.78) 0.400 (10.16) (6.2) 0.512 +0.002/-0.005 (13 +0.05/-0.12) Overall height 9 8 7 6 5 0.145 typ. (3.68) 0.24 2.39 (6.2) (60.6) Top View 1.90 (48.3) Side View 1.90 (48.3) M3 Threaded Standoff 4 Places 0.23 (5.9) 1 2 3 4 0.54 (13.8) 0.400 (10.16) 1.000 (25.40) 1.400 (35.56) 0.027 +0.007/-0.010 (0.69 +0.17/-0.25) Bottom side Clearance PINDESIGNATIONS NOTES 1)Appliedtorqueperscrewshouldnotexceed6in-lb.(0.7Nm) 2)Baseplateflatnesstoleranceis0.004"(0.10mm)TIRforsurface 3)Pins1,2,4,6-8,are0.040"(1.02mm)diameterwith0.080" (2.03mm)diameterstandoffshoulders 4)Pins5,9are0.080"(2.03mm)diametershoulderlesspins. 5)Otherpinextensionlengthsavailable 6)AllPins:Material-CopperAlloy Finish-MatteTinoverNickelplate 7)Undimensionedcomponentsareshownforvisualreferenceonly. 8)Weight:4.3oz.(123g)typical 9)Alldimensionsininches(mm) Tolerances:x.xx+/-0.02in.(x.x+/-0.5mm) x.xxx+/-0.010in.(x.xx+/-0.25mm) 10)Workmanship:MeetsorexceedsIPC-A-610CClassII PinNo. Name Function 1 Vin(+) Positiveinputvoltage 2 ON/OFF TTLinputtoturnconverteronand off,referencedtoVin(-),with internal pull up. 3 Reserved Notconnected 4 Vin(-) Negativeinputvoltage 5 Vout(-) Negativeoutputvoltage 6 SENSE(-) Return remote sense 7 TRIM Outputvoltagetrim 8 SENSE(+) Positiveremotesense 9 Vout(+) Positiveoutputvoltage Notes: 1.SENSE(–)shouldbeconnectedtoVout(–)eitherremotelyorattheconverter. 2.LeaveTRIMpinopenfornominaloutputvoltage. 3.SENSE(+)shouldbeconnectedtoVout(+)eitherremotelyorattheconverter. Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 2 Input: Output: Current: Package: Technical Specification 18-36 V 28 V 18 A (504 W) Half-brick IQ24280HZC18 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 Min. Typ. Max. ABSOLUTE MAXIMUM RATINGS Input Voltage Non-Operating 50 Operating 40 50 Operating Transient Protection Isolation Voltage (input to output) 2250 Operating Temperature -40 100 Storage Temperature -55 125 Voltage at ON/OFF input pin -2 18 INPUT CHARACTERISTICS Operating Input Voltage Range 18 24 36 Input Under-Voltage Lockout Turn-On Voltage Threshold 16.5 17.0 17.5 Turn-Off Voltage Threshold 15.0 15.5 16.0 Lockout Voltage Hysteresis 1.0 1.5 2.0 Maximum Input Current 38 No-Load Input Current 300 400 Disabled Input Current 100 125 Response to Input Transient 1.5 Input Reflected Ripple Current 10 25 Input Terminal Ripple Current 500 Recommended Input Fuse 40 Input Filter Component Values (L\C) 0.34\23 Recommended External Input Capacitance 470 OUTPUT CHARACTERISTICS Output Voltage Set Point 27.22 28.00 28.75 Output Voltage Regulation 1 +0.25\70 Over Line +0.25\70 Over Load1 +0.215 +0.560 Over Temperature Total Output Voltage Range 27.15 28.82 Output Voltage Ripple and Noise2 150 250 Peak-to-Peak 40 70 RMS Operating Output Current Range 0 18 19.5 21.0 22.5 Output DC Current-Limit Inception 11.5 Output DC Current-Limit Shutdown Voltage3 Back-Drive Current Limit while Enabled 4 5 6 Back-Drive Current Limit while Disabled 0 3 4 Maximum Output Capacitance 5 DYNAMIC CHARACTERISTICS Output Voltage during Load Current Transient For a Step Change in Output C urrent (0.1 A/µs) 1.5 For a Step Change in Output Current (5 A/µs) 1.5 Settling Time 8 Turn-On Transient Turn-On Time 24 37 40 Output Voltage Overshoot 5 EFFICIENCY 100% Load 93 95 50% Load TEMPERATURE LIMITS FOR POWER DERATING CURVES Semiconductor Junction Temperature 125 Board Temperature 125 Transformer Temperature 125 ISOLATION CHARACTERISTICS Isolation Voltage (dielectric strength) 2250 Isolation Resistance 30 Isolation Capacitance4 1000 Note Note Note Note 1: 2: 3: 4: Units Notes & Conditions V V V V °C °C V Continuous Continuous 100 ms transient, square wave Basic insulation, Pollution Degree 2 V 50 V transient for 100 ms V V V A mA mA V mA mA A µH\µF µF 100% Load, 18 Vin, trimmed up 20% 0.25 V/µs input transient RMS thru 3.3 µH inductor RMS Fast blow external fuse recommended Internal values Typical ESR 0.1-0.2 W V %\mV %\mV V V mV mV A A V A mA mF 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 18 A Resistive Load V V ms 50% to 75% to 50% Iout max, 200 µF load cap “ To within 1% Vout nom ms % Full load, ON/OFF to Vout=90% nom. No load, 5 mF load cap % % °C °C °C Package rated to 150°C UL rated max operating temp 130°C V MW pF 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 500ms off-time. Higher values of isolation capacitance can be added external to the module. Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 3 Input: Output: Current: Package: Technical Specification 18-36 V 28 V 18 A (504 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 STANDARDS COMPLIANCE Parameter STANDARDS COMPLIANCE UL/cUL 60950-1 EN60950-1 Needle Flame Test (IEC 695-2-2) IEC 61000-4-2 Min. Typ. Max. Units Notes & Conditions 232 116.0 235 117.5 237 118.5 kHz kHz 4.0 -2 4.75 -50 125 1.5 5.00 10 130 120 10 18 1.0 5.25 +20 135 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 Notes & Conditions 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) 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. QUALIFICATION TESTING Parameter QUALIFICATION TESTING Life Test Vibration Mechanical Shock Temperature Cycling Power/Thermal Cycling Design Marginality Humidity Solderability Product # IQ24280HZC18 # Units 32 5 5 10 5 5 5 15 pins Phone 1-888-567-9596 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 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 4 Input: Output: Current: Package: Technical Specification 100 70 95 60 Power Dissipation (W) Efficiency (%) 90 85 80 75 70 18 Vin 24 Vin 36 Vin 65 18-36 V 28 V 18 A (504 W) Half-brick 50 40 30 20 18 Vin 24 Vin 10 36 Vin 0 60 0 2 4 6 8 10 12 14 16 0 18 2 4 6 Load Current (A) 8 10 12 14 16 18 Load Current (A) Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. Figure 2: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 20 16 18 14 16 12 14 Iout (A) Iout (A) 10 8 12 10 8 6 6 400 LFM (2.0 m/s) 4 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 2 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 4 200 LFM (1.0 m/s) 2 100 LFM (0.5 m/s) 100 LFM (0.5 m/s) 0 0 25 40 55 70 25 85 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 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 (5 V/div) Ch 2: ON/OFF input (5 V/div) Figure 6: Turn-on transient at zero load (10 ms/div). Ch 1: Vout (5 V/div) Ch 3: ON/OFF input (5 V/div) Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 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 100 µF, 15 mW ESR electrolytic capacitors. Top trace: Vout (1 V/div). Bottom trace: Iout (10 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: 100 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 28 V 18 A (504 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 (500 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 # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 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 28 V 18 A (504 W) Half-brick Figure 14: Load current (10 A/div; 20 ms/div) as a function of time when the converter attempts to turn on into a 1 mW short circuit. 37 35 33 Output Voltage (V) 31 29 27 25 23 21 19 17 18 Vin 15 24 Vin 13 36 Vin 11 9 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 22 Load Current (A) Figure 15: Output voltage vs. load current showing typical current limit curves and OVP shutdown point. Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 7 Input: Output: Current: Package: Technical Specification 18-36 V 28 V 18 A (504 W) Half-brick BASICOPERATIONANDFEATURES CONTROLFEATURES The converter series uses a two-stage power conversion topology. The first stage keeps the output voltage constant over variations in line, load, and temperature. The second stage uses a transformer to provide the functions of input/output isolation and voltage stepdown to achieve the low output voltage required. 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, dissipate significantly less energy than Schottky diodes, enabling the converter to achieve high efficiency. The series of half-brick, quarter-brick and eighth-brick converters uses the industry standard footprint and pin-out configuration. ON/OFF ON/OFF Vin(_) Vin(_) RemoteEnableCircuit Pin8shouldbeconnectedtoVout(+)andPin6shouldbeconnectedtoVout(-)atthepointontheboardwhereregulationisdesired. If these connections are not made, the converter will deliver an output voltage that is slightly higher than its specified value. 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 industry standard trim equations. 5V ON/OFF CMOS Vin(_) Vin(_) 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 turns the converter on).FigureAdetailsfourpossiblecircuitsfor drivingtheON/OFFpin. DirectLogicDrive To decrease the output voltage, the user should connect a resistor betweenPin7(TRIM)andPin6(SENSE(–)input).Foradesired decrease of the nominal output voltage, the value of the resistor shouldbe: Rtrim-down = Phone 1-888-567-9596 kW where Figure A: Various circuits for driving the ON/OFF pin. Product # IQ24280HZC18 (100% )_2 ∆ www.synqor.com ∆% = Vnominal–Vdesired Vnominal Doc.# 005-IHZ2428 Rev. C x100% 09/19/08 Page 8 Input: Output: Current: Package: Technical Specification To increase the output voltage, the user should connect a resistor betweenPin7(TRIM)andPin8(SENSE(+)input).Foradesired increase of the nominal output voltage, the value of the resistor should be Rtrim-up = –2 ) x V ( Vnominal 1.225 DES+VNOM kW VDES–VNOM FigureBgraphstherelationshipbetweenthetrimresistorvalue, Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down. 100,000.0 Trim Resistance (kOhms) 10,000.0 18-36 V 28 V 18 A (504 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 converter will turn off. Output Current Limit:Iftheoutputcurrentexceedsthe“Output DCCurrentLimitInception”point*,thenafastlinearcurrentlimit controller will reduce the output voltage to maintain a constant output current. If as a result, the output voltage falls below the “Output DCCurrent Limit Shutdown Voltage”* for more than 50 ms, then the unit will enter into hiccup mode, with a 500 ms off-time. The unit will then automatically attempt to restart. 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 increase the output voltage to maintain a constant output current. If this results in the output voltage exceeding the “Output OverVoltageProtection”threshold*,thentheunitwillshutdown.The fullI-VoutputcharacteristicscanbeseeninFigure15. 1,000.0 100.0 10.0 1.0 0.1 0.0 0 5 10 15 20 25 % Increase in Vout 30 35 40 45 50 % Decrease in Vout Figure B: Trim Graph for 28 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 circuit to engage, particularly during transients. It is not necessary for the user to add capacitance at the Trim pin. The node is internally filtered to eliminate noise. 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 input is toggled. 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 temperatureatthesensedlocationreachesthe“Over-Temperature Shutdown” value*. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the“Over-TemperatureShutdownRestartHysteresis”value*. 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. *SeeElectricalCharacteristicspage. Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 9 Input: Output: Current: Package: Technical Specification APPLICATIONCONSIDERATIONS Input System Instability:Thiscondition can occur because any DC-DC converter appears incrementally as a negative resistanceload.Adetailedapplicationnotetitled“InputSystem Instability” is available on the SynQor website which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. 18-36 V 28 V 18 A (504 W) Half-brick Output Filtering and External Output Capacitance: FigureDbelowshowstheinternaloutputfiltercomponents.This filter dramatically reduces output voltage ripple. However, some minimum external output capacitance is required, as specified in theOutputCharacteristicssectionontheElectricalSpecifications page. No damage will occur without this capacitor connected, but peak output voltage ripple will be much higher. Application Circuits:FigureCbelowprovidesatypicalcircuit diagram which details the input filtering and voltage trimming. Input Filtering and External Input Capacitance:FigureD below shows the internal input filter components. This filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of an external electrolytic input capacitor. 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 # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 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 28 V 18 A (504 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 # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 11 Input: Output: Current: Package: Technical Specification 18-36 V 28 V 18 A (504 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 3 characters for options. A “-G” suffix indicates the product is 6/6 RoHS compliant. I Q 2 4 2 80 H Z C 1 8 N N S -G 6/6RoHS Options (see OrderingInformation) OutputCurrent Thermal Design PerformanceLevel Model Number Input Voltage Output Voltage Max Output Current IQ24280HZC18xyz IQ24500HZC10xyz 18 - 36 V 28V 18 A 18 - 36 V 50 V 10 A PackageSize OutputVoltage Input Voltage ProductFamily 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. The following options must be included in place of the x y z spaces in the model numbers listed above. Options Description: x y z 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]. 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. 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 # IQ24280HZC18 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-IHZ2428 Rev. C 09/19/08 Page 12