Technical Specification BQ55120EZB38 35-55V 12.0V 38A 2000V dc Eighth-brick Continuous Input Output Current Isolation DC-DC Converter The BusQor BQ55120EZx38 bus converter is a nextgeneration, board-mountable, isolated, fixed switching frequency dc/dc converter that uses synchronous rectification to achieve extremely high conversion efficiency. The BusQor series provides an isolated step down voltage from 48V to 12 or 9.6V intermediate bus with no regulation in a standard “eighth-brick” module. BusQor converters are ideal for creating the mid-bus voltage required to drive point-of-load (nonisolated) converters in intermediate bus architectures. ® Operational Features • • • • • High efficiency, 97% at full rated load current Delivers 38A full power with minimal derating - no heatsink required Operating input voltage range: 35-55V Fixed frequency switching provides predictable EMI No minimum load requirement BQ55120EZB38 Model Mechanical Features • Industry standard quarter-brick pin-out configuration • Size: 0.96 x 2.3” (24.4x58.4mm), height: 0.539" (13.69mm) • Total Baseplate weight: 1.69 oz (47.9 g) Control Features • On/Off control referenced to input side (positive and negative logic options are available) • Inherent current share (by droop method) for high current and parallel applications. Protection Features • Input under-voltage lockout and over-voltage shutdown protects against abnormal input voltages • Output current limit and short circuit protection (auto recovery) • Output over-voltage protection • Thermal shutdown Contents Page No. Safety Features • UL 60950-1/R2011-12 • EN60950-1/A2:2013 • CAN/CSA-C22.2 No. 60950-1/A1:2011 Product # BQ55120EZB38 Phone 1-888-567-9596 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Standards Compliance & Qualification Testing . . . . . . . . . . . . . . . . . . . . 5 Technical Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Applications Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 1 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Baseplated Mechanical Diagram 0.539 ± 0.030 [13.69 ± 0.75] Overall Height 0.96 [24.4] 0.040 ± 0.010 [ 1.02 ± 0.25 ] Bottomside Clearance 4 0.600 [ 15.24] 5 0.004 [0.10] 2.30 [ 58.4] 2.000 [ 50.80] 2.000 [ 50.80] 0.15 [ 3.8] 0.15[3.8] 0.660 [16.76] 0.14 [ 3.6] 3 0.180[4.57] 2 1 0.18 [4.6] SEE NOTE 1 0.300 [7.62] 0.600 [15.24] NOTES PIN DESIGNATIONS 1)APPLIED TORQUE PER M3 SCREW 5in-lb RECOMMENDED 6in-lb LIMIT) SCREW SHOULD NOT EXCEED 0.100" (2.54mm) DEPTH BELOW THE SURFACE OF THE BASEPLATE. 2)BASEPLATE FLATNESS TOLERANCE IS 0.004" (.10mm) TIR FOR SURFACE. 3)PINS 1-3 ARE 0.040" (1.02mm) DIA. WITH 0.080" (2.03mm) DIA. STANDOFF SHOULDERS 4)PINS 4 & 5 ARE 0.062" (1.57mm) DIA. WITH 0.100" (2.54mm) DIA. STANDOFF SHOULDERS 5)ALL PINS: MATERIAL: COPPER ALLOY FINISH: MATTE TIN OVER NICKEL PLATE 6) WEIGHT: 1.69oz (47.9g) 7)ALL DIMENSIONS IN INCHES (mm) TOLERANCES: X.XX IN +/-0.02 (X.X mm +/-0.5 mm) X.XXX IN +/-0.010 (X.XX mm +/-0.25 mm) Product # BQ55120EZB38 Phone 1-888-567-9596 Pin Name Function 1 Vin(+) Positive input voltage 2 ON/OFF Logic control input to turn converter on/off. 3 Vin(–) Negative input 4 Vout(–) Negative output 5 Vout(+) Positive output www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 2 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Technical Specification BQ55120EZB38 Electrical Characteristics Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C base plate temperature with appropriate power derating. Specifications subject to change without notice. Parameter Min. ABSOLUTE MAXIMUM RATINGS Input Voltage Non-Operating Operating 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 Input Over-Voltage Shutdown Turn-On Voltage Threshold Turn-Off Voltage Threshold Maximum Input Current No-Load Input Current Disabled Input Current Input Reflected-Ripple Current Input Terminal-Ripple Current Recommended Input Fuse (see Note 1) Recommended External Input Capacitance Input Filter Component Values (C) OUTPUT CHARACTERISTICS Output Voltage Set Point Output Voltage Regulation Over Line Over Load Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise Peak-to-Peak RMS Operating Output Current Range Output DC Current-Limit Inception Output DC Current-Limit Shutdown Voltage Back-Drive Current Limit while Disabled Maximum Output Capacitance EFFICIENCY 100% Load 50% Load Product # BQ55120EZB38 Typ. Max. Units Notes & Conditions -1 35 60 55 V V -40 -45 -2 2000 100 125 18 V °C °C V 55 V 35 48 33.4 31 2.4 56.9 59.2 8.5 10 375 10.8 115 12.0 20 20 47 9.4 µF 12 V 41.7\5.0 4.2\500 1.7\200 %\V %\mV %\mV V 8.300 Phone 1-888-567-9596 V V V V V V A mA mA mA mA A µF 13.750 90 25 0 150 38 mV mV A 5,000 A V mA µF 60 8 10 97 97 www.synqor.com Continuous Continuous Vin = 35 V RMS through 10µH inductor RMS, full load Fast blow external fuse recommended Typical ESR 0.1-0.2 Ω Internal value; see Note 4 Over sample, line, load, temperature & life 20 MHz bandwidth; see Note 2 Full load Full load Subject to thermal derating Output Voltage 10% Low; see Note 4 Negative current drawn from output 12.0 Vout at 20 A Resistive Load % % Doc.# 005-0006259 Rev. B 04/13/15 Page 3 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Technical Specification BQ55120EZB38 Electrical Characteristics (continued) Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C base plate temperature with appropriate power derating. Specifications subject to change without notice. Parameter Min. DYNAMIC CHARACTERISTICS Output Voltage during Load Current Transient Step Change in Output Current (0.1 A/µs) Settling Time Turn-On Transient Turn-On Time (with 5mF output capacitance) Start-Up Inhibit Time Output Voltage Overshoot ISOLATION CHARACTERISTICS Typ. Max. 400 100 15 200 2 22 Units Notes & Conditions mV µs 50% to 75% to 50% Iout max To within 1% Vout nom ms ms % Half load, Vout=90% nom. -40 °C to +125 °C; Figure F 5 mF load capacitance Isolation Voltage (dielectric strength) 2000 V See Absolute Maximum Ratings Isolation Resistance 30 MΩ Isolation Capacitance (input to output) 470 pF See Note 3 Semiconductor Junction Temperature 125 °C Package rated to 150 °C Board Temperature 125 °C UL rated max operating temp 130 °C Transformer Core Temperature 130 °C Base Plate Temperature 100 °C FEATURE CHARACTERISTICS Switching Frequency 215 250 280 kHz ON/OFF Control (Option P) Off-State Voltage -1 0.8 V On-State Voltage 2.4 18 V ON/OFF Control (Option N) On-State Voltage -1 0.8 V Off-State Voltage 2.4 18 V ON/OFF Control (Either Option) Application notes Figures A & B Open Voltage 4.4 V Pull-Up Current 0.044 mA Over-Temperature Shutdown OTP Trip Point 140 150 °C Average PCB Temperature Over-Temperature Shutdown Restart Hysteresis 10 °C RELIABILITY CHARACTERISTICS Calculated MTBF (Telcordia) TR-NWT-000332 4.8 106 Hrs. 80% load, 200LFM, 40 °C Ta Calculated MTBF (MIL-217) MIL-HDBK-217F 3.3 106 Hrs. 80% load, 200LFM, 40 °C Ta Field Demonstrated MTBF 106 Hrs. See our website for details Note 1: Safety product certification tests were carried out using 20A fast blow fuse. Fuse interruption characteristics have to be taken into account while designing input traces. User should ensure that Input trace is capable of withstanding fault currents Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected]) Note 3: Isolation capacitance can be added external to the module. Note 4: Recommend adding external filter inductor (0.47 µH) between external input capacitance (47 µF) and Bus Qor module. Product # BQ55120EZB38 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 4 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Technical Specification Standards Compliance & Qualification Testing Parameter Notes & Conditions STANDARDS COMPLIANCE UL 60950-1/R2011-12 Basic insulation EN60950-1/A2:2013 CAN/CSA-C22.2 No. 60950-1/A1:2011 Note: An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or download from the SynQor website. Parameter QUALIFICATION TESTING Life Test Vibration Mechanical Shock Temperature Cycling Power/Thermal Cycling Design Marginality Humidity Solderability Product # BQ55120EZB38 # 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, y and 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, 95% RH, 1000 hours, continuous Vin applied except 5 min/day MIL-STD-883, method 2003 www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 5 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Technical Figures 100 98.0 95 97.5 90 97.0 Efficiency (%) Efficiency (%) 85 80 75 70 96.0 35 Vin 25º C 48 Vin 65 95.5 55 Vin 0 10 20 30 Load Current (A) 95.0 40 Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 100 200 Air Flow (LFM) 300 15 10 Power Dissipation (W) 11 10 35 Vin 9 8 25º C 40º C 48 Vin 55º C 55 Vin 0 0 10 20 Load Current (A) 30 400 Figure 2: Efficiency at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal input voltage). 20 5 40º C 55º C 60 Power Dissipation (W) 96.5 7 100 40 Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 200 Air Flow (LFM) 300 400 Figure 4: Power dissipation at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal input voltage). 500 40 35 400 30 Pout (W) Iout (A) 25 20 15 200 400 LFM (2.0 m/s) 10 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 300 LFM (1.5 m/s) 100 200 LFM (1.0 m/s) 5 0 300 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 25 40 100 LFM (0.5 m/s) 50 60 70 0 85 Ambient Air Temperature (ºC) Phone 1-888-567-9596 40 Semiconductor junction is 50 60temperature 70 within 1°C of surface temperature 85 Ambient Air Temperature (ºC) Figure 5: Maximum output current derating curve vs. ambient air temperature (with baseplate only) at different airflow rates with air flowing from output to input (nominal input voltage). Product # BQ55120EZB38 25 Figure 6: Maximum output power derating curve vs. ambient air temperature (with baseplate only) at different airflow rates with air flowing from output to input (nominal input voltage). www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 6 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Technical Figures 500 40 35 400 30 Pout (W) Iout (A) 25 20 15 200 400 LFM (2.0 m/s) 10 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 300 LFM (1.5 m/s) 100 200 LFM (1.0 m/s) 5 0 300 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 25 40 100 LFM (0.5 m/s) 50 60 70 0 85 Ambient Air Temperature (ºC) 25 40 50 60 70 85 Ambient Air Temperature (ºC) Figure 7: Maximum output current derating curve vs. ambient air temperature (with both baseplate and ¼” heat sink) at different airflow rates with air flowing from output to input (nominal input voltage). Figure 8: Maximum output power derating curve vs. ambient air temperature (with both baseplate and ¼” heat sink) at different airflow rates with air flowing from output to input (nominal input voltage). Figure 9: Turn-on transient at 100% load (resistive load) (5ms/div). Load cap: 5mF output capacitance. Input voltage pre-applied. Ch 1: ON/OFF input (2 V/ div). Ch 2: Vout (2V/div). Figure 10: Turn-on transient at zero load (5ms/div). Load cap: 5mF output capacitance. Ch 1: ON/OFF input (2 V/div). Ch 2: Vout (2V/div). Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 15µF tantalum cap and 1µF ceramic cap. Ch 1: Vout (500mV/div), Ch 2: Iout (20A/div). Figure 12: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 1A/µs). Load cap: 15µF, 30 mΩ ESR tantalum cap and 1µF ceramic cap. Ch 1: Vout (500 mV/div), Ch 2: Iout (20A/div). Product # BQ55120EZB38 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 7 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Technical Figures Input Reflected Ripple Current source impedance iS Input Terminal Ripple Current iC VSOURCE Output Voltage Ripple DC-DC Converter VOUT electrolytic capacitor ceramic 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 10µH source impedance and 47µF electrolytic capacitor (1 A/div). See Figure 13. Figure 15: Input reflected ripple current, is, through a 10µH source inductor, using a 47µF electrolytic input capacitor (20mA/div). See Figure 13. Figure 16: Output voltage ripple at nominal input voltage and rated load current (50mV/div). Load capacitance: 1µF ceramic capacitor and 15µF tantalum capacitor. Bandwidth: 20MHz. See Figure 13. 15 Output Voltage (V) 12 9 6 35 Vin 3 48 Vin 55 Vin 0 0 10 20 30 Load Current (A) 40 50 Figure 17: Output voltage vs. load current for different input voltages showing typical current limit curves. Product # BQ55120EZB38 Phone 1-888-567-9596 Figure 18: Load current (50A/div) as a function of time when the converter attempts to turn on into a 1mΩ short circuit. Top trace (500µs/div) is an expansion of the on-time portion of the bottom trace. www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 8 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Applications Section BASIC OPERATION AND FEATURES CONTROL FEATURES With voltages dropping and currents rising, the economics of an Intermediate Bus Architecture (IBA) are becoming more attractive, especially in systems requiring multiple low voltages. IBA systems separate the role of isolation and voltage scaling from regulation and sensing. The BusQor series bus converter provides isolation and an unregulated voltage step down in one compact module, leaving regulation to simpler, less expensive non-isolated converters. 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(-). In the negative logic version, the ON/OFF signal is active low (meaning that a low turns the converter on). Figure B is a detailed look of the internal ON/OFF circuitry. In Figure A below, the BusQor module provides the isolation stage of the IBA system. The isolated bus then distributes power to the non-isolated buck regulators to generate the required voltage levels at the points of load. In this case, the bucks are represented with SynQor’s NiQor series of nonisolated DC/DC converters. In many applications requiring multiple low voltage outputs, significant savings can be achieved in board space and overall system costs When designing an IBA system with bus converters, the designer can select from a variety of bus voltages. While there is no universally ideal bus voltage, most designs employ one of the following: 12V, 9.6V, 7.5V, 5V, or 3.3V. Higher bus voltages can lead to lower efficiency for the buck regulators but are more efficient for the bus converter and provide lower board level distribution current. Lower bus voltages offer the opposite trade offs. Vin(+) On/Off 10V 124K 49.9K TTL 100K Vin(-) Figure B: Internal ON/OFF pin circuitry SynQor’s BusQor modules act as a true dc transformer. The output voltage is proportional to the input voltage, with a specified “turns ratio” or voltage ratio, plus minor drop from the internal resistive losses in the module. When used in IBA systems, the output variation of the BusQor must be in accordance with the input voltage range of the non-isolated converters being employed. The BusQor architecture is very scalable, meaning multiple bus converters can be connected directly in parallel to allow current sharing for higher power applications. 3.3V 48Vdc Front End 48Vdc 35-55V 2.5V BusQor Converter 12Vdc 1.8V 1.5V 0.9V Typical User Board NiQor Converters Loads Figure A: Example of Intermediate Bus Architecture using BusQor bus converter and NiQor non-isolated converters Product # BQ55120EZB38 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 9 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Applications Section PROTECTION FEATURES 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 application note titled “Input System Instability”. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical TurnOn Voltage Threshold value (listed on the specification page) 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. Also see Figure E. Output Current 85 A peak Output Voltage <12V 0V Time 220ms 20ms Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to scale) Output Current 60A 38A Output Voltage 12V Output Current Limit: The output of the BusQor module is electronically protected against output overloads. When an overload current greater than the “DC Current-Limit Inception” specification is drawn from the output, the output shuts down to zero volt in a period of 1ms typical (see Figure C). The shutdown period lasts for a typical period of 200ms (Figure D) after which the BusQor tries to power up again (20ms). If the overload persists, the output voltage will go through repeated cycles of shutdown and restart with a duty cycle of 10% (On) and 90% (Off) respectively. The BusQor module returns (auto resetting) to normal operation once the overload is removed. The BusQor is designed to survive in this mode indefinitely without damage and without human intervention. To insure the current limit set point is within the range specified in the electrical characteristics table, adding an input inductor is recommended. This design does not have an "on-board" input inductor like most other SynQor products. the value of the inductor should be selected so that the resonant frequency of this inductor and the "on board" input capacitance is below (with margin) the input ripple frequency (2*fs). 0V 1ms Time Figure C: Output Overload protection diagram (not to scale) Product # BQ55120EZB38 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 10 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Applications Section APPLICATION CONSIDERATIONS Start-Up Inhibit Period: Figure E details the Start-Up Inhibit Period for the BusQor module. At time t0, when Vin is applied with On/Off pin asserted (enabled), the BusQor output begins to build up. Before time t1, 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 typical Startup Inhibit Period of 12ms is initiated. The output builds up to 90% of the nominal value of 12V in a period of 15ms typical (50 % load). Secondary Primary Bridging Capacitor 0.01” 1.50” 0.023” At time t2, when the On/Off pin is de-asserted (disabled), the BusQor output instantly drops to 0V. Fall time from 12V to 0V is dependent on output capacitance and any parasitic trace inductance in the output load circuit. At time t3, when the On/Off pin is re-asserted (enabled), the BusQor module output begins to build up after the inhibit period of 200 ms typical has elapsed. Refer to the Control Features section of the data sheet for details on enabling and disabling methods for Bus Qor modules. Vin 0.01” Figure F: Keep Out Areas for BusQor module (bottom view) Component Keep Out Area: Keep out areas for components not referenced to the Primary circuit are shown in shaded areas in Figure F. The keep out areas shown are consistent with UL’s requirements for Basic Insulation of 0.04” (40 mils) for Pollution degree 2. User should consult UL standards for other insulation classes and operating environments. UVLO On/Off For applications that require mounting parts BELOW the BusQor module, one should be aware of potential high levels of electromagnetic interference, in addition to safety keep out. Users are advised to consult SynQor Applications engineering in such applications. (N logic) OFF ON t0 t1 t2 t t3 Vout Initial Start-up Inhibit Start-up Inhibit Time Copper Keep Out Area: Keep out areas shown in Figure F are to be observed for Top layer copper traces and vias. Internal layers buried one or more layers may be exempt, depending on the PCB material grade and thickness. Users are advised to consult UL standards for details. All layers including top and bottom, are subject to the keep out areas shown around Primary pins of BusQor module. Actual keep outs along the surface (Creepage) may vary depending on the PCB material CTI. Users are advised to consult UL standards for details. Bridging Components: Bridging components like EMI filter capacitors required to be placed as close as possible to the BusQor module for optimum performance must observe the clearance/creepage requirements Figure E: Power Up/Down Diagram (not to scale) showing Start-Up Inhibit Period of 0.04”(40 mils) between pads to maintain compliance to UL standards for the overall power system. Start-Up Note: Referenced keep out widths are adequate to withstand UL’s Basic Insulation Dielectric strength tests for approved PCB materials. Applications requiring Double or Reinforced insulation must double the keep out widths shown in Figure F. Keep out areas shown have standard margins above UL’s minimum requirements. Product # BQ55120EZB38 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 11 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Applications Section 5.0% Deviation from 50/50 Sharing (%) 4.0% L1 3.0% C1 2.0% BusQor 1 1.0% Common Mode 0.0% -1.0% C3 -2.0% L2 -3.0% C2 Module 1 Module 2 -4.0% BusQor 2 -5.0% 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 C4 Total Load Current (A) Figure G: Current share performance of 2 paralleled modules Figure H: Recommended PCB layout for input circuit 48Vin Current Sharing: BusQor modules are designed to operate in parallel without the use of any external current share circuitry. A typical circuit for paralleling two BusQor modules is shown in Figure G. An output capacitor is recommended across each module and located close to the converter for optimum filtering and noise control performance. Dedicated input capacitors / inductors are recommended. The input inductor should be placed between the external input capacitor and the input pins of the Bus Qor module. The external input inductor will limit the ripple current into the external input capacitor (this Bus Qor product does not have an "on board" input inductor). PCB layout in the input circuit should be such that high frequency ripple currents of each module is restricted to a loop formed by the input capacitors / inductor and the input terminals of the BusQor module. See Figure H for details on PCB layout. Contact SynQor application engineering for further assistance on PCB trace design. The current share performance of two paralleled modules is illustrated in the graph in Figure H. In this graph the typical percent deviation from ideal sharing (50%) is plotted for each module versus the total output load current at 48Vin. Product # BQ55120EZB38 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 12 Input: 35-55V Output: 12.0V Current: 38A Package: Eighth-brick Ordering Information 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. BQ 5 5 1 2 0 E Z B 3 8 N R S - G 6/6 RoHS Options (see Ordering Information) Model Number Input Voltage BQ55120EZB38xyz-G 35-55V Output Voltage 12.0V Max Output Current 38A 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 Product Family Thermal Design B - Baseplated 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. Options Description: w x y z Enable Logic Pin Style N - Negative N - 0.145" R - 0.180" Feature Set S - Standard Not all combinations make valid part numbers, please contact SynQor for availability. See the Product Summary web page for more options. 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]. Contact SynQor for further information and to order: Phone: Toll Free: Fax: E-mail: Web: Address: Product # BQ55120EZB38 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 PATENTS SynQor holds numerous U.S. patents, one or more of which apply to most of its power converter products. Any that apply to the product(s) listed in this document are identified by markings on the product(s) or on internal components of the product(s) in accordance with U.S. patent laws. SynQor’s patents include the following: 5,999,417 6,222,742 6,545,890 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146 7,119,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702 7,765,687 7,787,261 8,023,290 8,149,597 8,493,751 8,644,027 WARRANTY SynQor offers a three (3) year limited warranty. Complete warranty information is listed on our website or is available upon request from SynQor. www.synqor.com Doc.# 005-0006259 Rev. B 04/13/15 Page 13