IQ24280HZC18NRS

Technical Specification IQ24280HZC18 18-36 V Input Output 28 V Current 18 A 2250 Vdc Isolation DC-DC Converter Half-brick 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. 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%) IQ24280HZC18 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 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) 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 Control Features • On/Off control referenced to input side Product # IQ24280HZC18 Phone 1-888-567-9596 Technical Specification MECHANICAL DIAGRAM 2.49 (63.1) 2.00 (50.8) 1.400 (35.56) 1.000 (25.40) 0.700 (17.78) 0.400 (10.16) 0.24 (6.2) Input: Output: Current: Package: 18-36 V 28 V 18 A (504 W) Half-brick 0.512 +0.002/-0.005 (13 +0.05/-0.12) Overall height 9 2.39 (60.6) 8 76 5 0.24 (6.2) 0.145 typ. (3.68) 1.90 (48.3) Top View 1.90 (48.3) M3 Threaded Standoff 4 Places Side View 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 NOTES 1) Applied torque per screw should not exceed 6in-lb. (0.7 Nm) 2) Baseplate flatness tolerance is 0.004" (0.10 mm) TIR for surface 3) Pins 1, 2, 4, 6-8, are 0.040" (1.02mm) diameter with 0.080" (2.03 mm) diameter standoff shoulders 4) Pins 5, 9 are 0.080" (2.03 mm) diameter shoulderless pins. 5) Other pin extension lengths available 6) All Pins: Material - Copper Alloy Finish - Matte Tin over Nickel plate 7) Undimensioned components are shown for visual reference only. 8) Weight: 4.3 oz. (123 g) typical 9) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 10) Workmanship: Meets or exceeds IPC-A-610C Class II PIN DESIGNATIONS Pin No. Name 1 2 3 4 5 6 7 8 9 Vin(+) ON/OFF Reserved Vin(-) 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 input voltage Negative output voltage Return remote sense Output voltage trim Positive remote sense Positive output voltage 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. Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 2 Technical Specification IQ24280HZC18 ELECTRICAL CHARACTERISTICS 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 Input: Output: Current: Package: 18-36 V 28 V 18 A (504 W) Half-brick 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. Min. -40 -55 -2 18 16.5 15.0 1.0 27.22 Typ. 24 17.0 15.5 1.5 300 100 1.5 10 500 0.34\23 470 28.00 +0.25\70 +0.25\70 +0.215 150 40 21.0 11.5 5 3 1.5 1.5 8 37 93 95 2250 30 1000 Max. 50 40 50 2250 100 125 18 36 17.5 16.0 2.0 38 400 125 25 40 28.75 +0.560 28.82 250 70 18 22.5 6 4 5 40 5 125 125 125 Units V V V V °C °C V V V V V A mA mA V mA mA A µH\µF µF 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 100 ms transient, square wave Basic insulation, Pollution Degree 2 50 V transient for 100 ms 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 27.15 0 19.5 4 0 24 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 50% to 75% to 50% Iout max, 200 µF load cap “ To within 1% Vout nom Full load, ON/OFF to Vout=90% nom. No load, 5 mF load cap Package rated to 150°C UL rated max operating temp 130°C Note 1: Line and load regulation is limited by duty cycle quantization and does not indicate a shift in the internal voltage reference. Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com). Note 3: 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. Note 4: 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 Technical Specification 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 Input: Output: Current: Package: 18-36 V 28 V 18 A (504 W) Half-brick Min. 232 116.0 4.0 -2 4.75 -50 125 Typ. 235 117.5 1.5 5.00 10 130 120 10 TBD TBD Max. 237 118.5 18 1.0 5.25 +20 135 Units kHz kHz V V V V kW % % °C °C Notes & Conditions 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 STANDARDS COMPLIANCE UL/cUL 60950-1 EN60950-1 Needle Flame Test (IEC 695-2-2) IEC 61000-4-2 Parameter 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 QUALIFICATION TESTING Life Test Vibration Mechanical Shock Temperature Cycling Power/Thermal Cycling Design Marginality Humidity Solderability Parameter # 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 # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 4 Technical Specification 100 95 70 60 Input: Output: Current: Package: 18-36 V 28 V 18 A (504 W) Half-brick Power Dissipation (W) 90 50 40 30 20 10 0 18 Vin 24 Vin 36 Vin Efficiency (%) 85 80 75 70 65 60 0 2 4 6 8 10 12 14 16 18 18 Vin 24 Vin 36 Vin 0 2 4 6 8 10 12 14 16 18 Load Current (A) 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. 16 14 12 20 18 16 14 10 Iout (A) Iout (A) 12 10 8 8 6 4 2 0 25 40 55 70 85 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 6 4 2 0 25 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 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) Product # IQ24280HZC18 Phone 1-888-567-9596 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) Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 5 www.synqor.com Technical Specification Input: Output: Current: Package: 18-36 V 28 V 18 A (504 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/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 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). source impedance Figure 10 Figure 12 iS VSOURCE iC DC-DC Converter 1 µF VOUT 100 µF, 10mW ESR electrolytic capacitor 470 µF, 0.2W ESR 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 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. Product # IQ24280HZC18 Phone 1-888-567-9596 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. Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 6 www.synqor.com Technical Specification Input: Output: Current: Package: 18-36 V 28 V 18 A (504 W) Half-brick 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. 37 35 33 31 29 27 25 23 21 19 17 15 13 11 9 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 22 18 Vin 24 Vin 36 Vin 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. Output Voltage (V) 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 Technical Specification BASIC OPERATION AND FEATURES 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. Both the first stage and the second stage switch at a fixed frequency for predictable EMI performance. Rectification of the transformer’s output is accomplished with synchronous rectifiers. These devices, which are MOSFETs with a very low on-state resistance, dissipate 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 Input: Output: Current: Package: CONTROL FEATURES 18-36 V 28 V 18 A (504 W) Half-brick REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits the user to control when the converter is on or off. This input is referenced to the return terminal of the input bus, Vin(-). The ON/OFF signal is active low (meaning that a low voltage turns the converter on). Figure A details four possible circuits for driving the ON/OFF pin. REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter’s output pins to the load. Pin 8 should be connected to Vout(+) and Pin 6 should be connected to Vout(-) at the point on the board where regulation is desired. If these connections are not made, the converter will deliver an output voltage that is slightly higher than its specified value. Note: The output over-voltage protection circuit senses the voltage across the sense leads (pins 8 and 6) to determine when it should trigger, not the voltage across the converter’s output pins (pins 9 and 5). OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits the 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. To decrease the output voltage, the user should connect a resistor between Pin 7 (TRIM) and Pin 6 (SENSE(–) input). For a desired decrease of the nominal output voltage, the value of the resistor should be: Vin(_) Remote Enable Circuit Vin(_) Negative Logic (Permanently Enabled) ON/OFF CMOS 5V ON/OFF Vin(_) Open Collector Enable Circuit Vin(_) Direct Logic Drive Rtrim-down = where (100%) _ 2 ∆ kW Figure A: Various circuits for driving the ON/OFF pin. ∆% = Vnominal – Vdesired Vnominal x 100% Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 8 Technical Specification To increase the output voltage, the user should connect a resistor between Pin 7 (TRIM) and Pin 8 (SENSE(+) input). For a desired increase of the nominal output voltage, the value of the resistor should be Input: Output: Current: Package: PROTECTION FEATURES 18-36 V 28 V 18 A (504 W) Half-brick Rtrim-up = ( Vnominal – 2 ) x V 1.225 DES + VNOM kW VDES – VNOM Figure B graphs the relationship between the trim resistor value, Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down. 100,000.0 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 DC hysteresis. When the input voltage is rising, it must exceed the typical “Turn-On Voltage Threshold” value* before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Output Current Limit: If the output current exceeds the “Output DC Current Limit Inception” point*, then a fast linear current limit controller will reduce the output voltage to maintain a constant output current. If as a result, the output voltage falls below the “Output DC Current 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*, then a fast back-drive limit controller will increase the output voltage to maintain a constant output current. If this results in the output voltage exceeding the “Output OverVoltage Protection” threshold*, then the unit will shut down. The full I-V output characteristics can be seen in Figure 15. 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: A temperature sensor on the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the “Over-Temperature Shutdown” value*. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the “Over-Temperature Shutdown Restart Hysteresis” value*. Trim Resistance (kOhms) 1,000.0 100.0 10.0 1.0 0.1 0.0 0 5 10 15 20 25 30 35 40 45 50 % Increase in Vout % 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. Total DC Variation of Vout: For the converter to meet its full 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. * See Electrical Characteristics page. Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 9 Technical Specification APPLICATION CONSIDERATIONS 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: Figure C below provides a typical circuit diagram which details the input filtering and voltage trimming. Input Filtering and External Input Capacitance: Figure D 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 Input Characteristics section on the Electrical Specifications page. More detailed information is available in the application note titled “EMI Characteristics” on the SynQor website. Input: Output: Current: Package: 18-36 V 28 V 18 A (504 W) Half-brick Output Filtering and External Output Capacitance: Figure D below shows the internal output filter components. This filter dramatically reduces output voltage ripple. However, some minimum external output capacitance is required, as specified in the Output Characteristics section on the Electrical Specifications page. No damage will occur without this capacitor connected, but peak output voltage ripple will be much higher. 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). Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 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 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. Pdiss = max 100 ºC - 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) Product # IQ24280HZC18 Phone 1-888-567-9596 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 11 Technical Specification PART NUMBERING SYSTEM The part numbering system for SynQor’s dc-dc converters follows the format shown in the example below. IQ 2 4 2 80 H Z C 1 8 N N S - G 6/6 RoHS Options (see Ordering Information) Output Current Thermal Design Performance Level Package Size Output Voltage Input Voltage Product Family Input: Output: Current: Package: ORDERING INFORMATION 18-36 V 28 V 18 A (504 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 3 characters for options. A “-G” suffix indicates the product is 6/6 RoHS compliant. Model Number IQ24280HZC18xyz IQ24500HZC10xyz Input Voltage 18 - 36 V 18 - 36 V Output Voltage 28V 50 V Max Output Current 18 A 10 A 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 Enable Logic N - Negative Pin Style R - 0.180" Feature Set 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. 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: 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 # IQ24280HZC18 www.synqor.com Doc.# 005-IHZ2428 Rev. C 09/19/08 Page 12