Technical Specification SQ60120EPB25 36-75V 100V Continuous Input Transient Input 12V 300W 2250V dc Eighth-brick Outputs Max Power Isolation DC-DC Converter The BusQor® SQ60120EPB25 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 power dissipated by the converter is so low that a heatsink is not required, which saves cost, weight, height, and application effort. The SQ BusQor series provides an isolated step down voltage from 48V to a semi-regulated 12V intermediate bus. BusQor converters are ideal for customers who need multiple outputs and wish to build or buy point of load converters to work with a 12V rail. RoHS Compliant (see last page). Operational Features • High efficiency, 95% at full rated load current • Delivers 25A (300W) power with minimal derating - no heatsink required • Operating input voltage range: 36-75V • Fixed frequency switching provides predictable EMI • No minimum load requirement SQ60120EPB25 Model Control Features • On/Off control referenced to input side • Inherent current share (by droop method) for high current and parallel applications. Mechanical Features Protection Features • Industry standard quarter-brick pin-out configuration • Size: 2.30" x 0.96" (58.4 x 24.4mm), 0.563” (14.30mm) • Total weight: 1.62 oz (46.2 g) • Input under-voltage lockout and over-voltage shutdown protects against abnormal input voltages • Output current limit and short circuit protection • 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 #SQ60120EPB25 Phone 1-888-567-9596 Mechanical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Standards Compliance & Qualification Testing . . . . . . . . . . . . . . . . . . . . 8 Technical Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Applications Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 1 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 Baseplated Mechanical 1 0.852 [21.64] 2.30 [58.4] 0.600 [15.24] 0.300 [7.62] SEATING PLANE HEIGHT 0.563±0.030 [ 14.30±0.76 ] 0.632±0.020 [ 16.05±0.50 ] 1 3 PIN EXTENSION 0.180 [4.57] SEE NOTE 6 0.008±0.020 [ 0.20±0.50 ] TOP 2.004 [50.90] 2 BOTTOM SIDE 2.000 [50.80] THREADED INSERT SEE NOTE 1 (3 PLCS) 0.004 [0.10] BOTTOMSIDE CLEARANCE 0.033±0.020 [ 0.84±0.50 ] 0.664 [16.87] 0.96 [24.4] 4 PIN DESIGNATIONS NOTES 1) M3 SCREW USED TO SECURE UNITS BASEPLATE TO OTHER SURFACES SUCH AS HEATSINK MUST NOT EXCEED 0.100" (2.54mm) DEPTH BELOW THE SURFACE OF THE BASEPLATE 2) APPLIED TORQUE PER SCREW SHOULD NOT EXCEED 6in-lb (0.7Nm) 3) PINS 4-5 ARE 0.062" (1.57mm) DIA. WITH 0.100" (2.54mm) DIA. STANDOFF SHOULDERS 4) PINS 1-3 ARE 0.040"(1.02mm) DIA. WITH 0.080" (2.03mm) DIA. STANDOFF SHOULDERS 5) ALL PINS: MATERIAL: COPPERY ALLOY FINISH: MATTE TIN OVER NICKEL PLATE 6) OTHER PIN EXTENSION LENGTHS AVAILABLE 7) BASEPLATE FLATNESS TOLERANCE IS 0.004" (0.10mm)TIR FOR SURFACE 8) UNDIMENSIONED COMPONENTS ARE SHOWN FOR VISUAL REFERENCE ONLY 9) ALL DIMENSIONS IN INCHES(mm) TOLERANCES: X.XX IN +/-0.02 (X.Xmm +/-0.5mm) 10) Weight: 1.62 oz (46.2 g) Product #SQ60120EPB25 5 Phone 1-888-567-9596 Pin Name 1 2 3 4 5 Vin(+) ON/OFF Vin(–) Vout(-) Vout(+) www.synqor.com Function Positive input voltage Logic control input to turn converter on/off. Negative input Negative output Positive output Doc.# 005-0006514 Rev. E 07/30/2015 Page 2 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 Technical Specification SQ60120EPB25 Electrical Characteristics Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C baseplate 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 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 (L\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 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 Fault Inhibit Time Output Voltage Overshoot Product #SQ60120EPB25 Min. Typ. Max. -1 36 48 100 75 100 V V V 2250 100 125 18 V °C °C V 75 V 34 32 4 V V V V V V A mA mA mA mA A µF µH\µF -40 -45 -2 36 48 31 28 2 95 105 7.5 200 9.5 130 8.5 14 350 20 47 1.0\9.4 12.2 12.25 12.3 V 12.65 V mV mV V +0.05\-1.0 +0\-0.6 ±300 10.45 Phone 1-888-567-9596 90 30 Units Notes & Conditions 100 ms transient, square wave Vin when unit turns on after shutdown event Vin when unit will shut down 100% Load, 36 Vin RMS through 10µH inductor RMS, full load Fast blow external fuse recommended Typical ESR 0.1-0.2 Ω Internal values Vin = 65 V, no load, Ta = 25 °C Over sample, line, load, temperature & life 20 MHz bandwidth; see Note 2 Full load Full load Subject to thermal derating Output Voltage 10% Low 3,000 mV mV A A V mA µF 1800 200 2500 300 mV µs 50% to 75% to 50% Iout max To within 1% Vout nom 15 200 0 24 ms ms % Full load, Vout=90% nom. -40 °C to +100 °C; Figure E 3 mF load capacitance, No Load 0 170 65 25 Continuous Continuous 100 ms transient, square wave 35 10.5 50 www.synqor.com Negative current drawn from output 12Vout at 12A Resistive Load Doc.# 005-0006514 Rev. E 07/30/2015 Page 3 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 Technical Specification SQ60120EPB25 Electrical Characteristics (continued) Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C baseplate temperature with appropriate power derating. Specifications subject to change without notice. Parameter Min. Typ. Max. Units Notes & Conditions ISOLATION CHARACTERISTICS Isolation Voltage (dielectric strength) 2250 V See Absolute Maximum Ratings Isolation Resistance 30 MΩ N/A Isolation Capacitance (input to output) pF See Note 3 TEMPERATURE LIMITS FOR POWER DERATING CURVES Semiconductor Junction Temperature 125 °C Package rated to 150 °C Board Temperature 125 °C UL rated max operating temp 130 °C Transformer Temperature 135 °C EFFICIENCY 100% Load 95 % 50% Load 95.5 % FEATURE CHARACTERISTICS Switching Frequency 220 250 280 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 Figure B Pull-Up Voltage 5 V Pull-Up Resistance 124 kΩ Output Over-Voltage Protection 16 V Over full temp range; no load 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 2.6 106 Hrs. 80% load, 200LFM, 40 °C Ta Calculated MTBF (MIL-217) MIL-HDBK-217F 2.1 106 Hrs. 80% load, 200LFM, 40 °C Ta Field Demonstrated MTBF TBD 106 Hrs. See our website for details Note 1: Safety 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. Product #SQ60120EPB25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 4 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 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 #SQ60120EPB25 # 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.# 005-0006514 Rev. E 07/30/2015 Page 5 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 Technical Figures 100 97.0 95 96.5 96.0 Efficiency (%) Efficiency (%) 90 85 80 25º C 48 Vin 94.5 75 Vin 0 5 10 15 40º C 55º C 20 25 94.0 Load Current (A) 12 15 10 Power Dissipation (W) 20 10 5 100 200 Air Flow (LFM) 300 36 Vin 8 6 25º C 40º C 48 Vin 55º C 75 Vin 0 0 5 10 15 20 4 100 25 Load Current (A) 30 300 25 250 20 200 15 300 LFM (1.5 m/s) 40 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 50 60 70 0 85 Ambient Air Temperature (ºC) Phone 1-888-567-9596 25 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 Vin- to Vin+ (nominal input voltage). Product #SQ60120EPB25 400 300 LFM (1.5 m/s) 50 200 LFM (1.0 m/s) 25 300 400 LFM (2.0 m/s) 100 LFM (0.5 m/s) 0 Air Flow (LFM) 150 100 400 LFM (2.0 m/s) 5 200 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). Pout (W) Iout (A) Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. 10 400 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). Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25°C. Power Dissipation (W) 95.0 36 Vin 75 70 95.5 Figure 6: Maximum output power derating curve vs. ambient air temperature (with baseplate only) at different airflow rates with air flowing from Vin- to Vin+ (nominal input voltage). www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 6 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 30 300 25 250 20 200 Pout (W) Iout (A) Technical Figures 15 10 100 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 5 150 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 50 200 LFM (1.0 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 0 25 40 100 LFM (0.5 m/s) 50 60 70 0 85 25 40 Ambient Air Temperature (ºC) 50 60 70 85 Ambient Air Temperature (ºC) Figure 7: Maximum output current derating curve vs. ambient air temperature (with both baseplate and 0.5” heat sink) at different airflow rates with air flowing from Vin- to Vin+ (nominal input voltage). Figure 8: Maximum output power derating curve vs. ambient air temperature (with both baseplate and 0.5” heat sink) at different airflow rates with air flowing from Vin- to Vin+ (nominal input voltage). Figure 9: Turn-on transient at half load (resistive load) and 3mF output capacitance (2 ms/div). Input voltage pre-applied. Ch 1: Vout (5V/div). Ch 2: ON/OFF input (2V/div). Figure 10: Turn-on transient at zero load and 3mF output capacitance (2ms/div). Input voltage pre-applied. Ch 1: Vout (5V/div). Ch 2: ON/OFF input (2V/div). Input Reflected Ripple Current Input Terminal Ripple Current Output Voltage Ripple 10 µH source impedance iS iC DC-DC Converter VOUT VSOURCE 47 µF, <1Ω ESR electrolytic capacitor Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 100µF, electrolytic cap, 15uF tantalum cap, and 1µF ceramic cap. Ch 1: Vout (2V/div), Ch 2: Iout (10A/div). Product #SQ60120EPB25 Phone 1-888-567-9596 1 µF ceramic capacitor 15 µF, 450mΩ ESR tantalum capacitor Figure 12: Test set-up diagram showing measurement pints for Input Terminal Ripple Current (Figure 13), Input Reflected Ripple current (Figure 14) and Output Voltage Ripple (Figure 15). www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 7 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 Technical Figures Figure 13: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 10 µH source impedance and 47µF electrolytic capacitor (200 mA/div). See Figure 12. Figure 14: Input reflected ripple current, is, through a 10 µH source inductor, using a 47µF electrolytic input capacitor (10 mA/div). See Figure 12. 14 Output Voltage (V) 12 10 8 6 4 36 Vin 48 Vin 2 75 Vin 0 0 5 10 15 20 25 30 35 40 Load Current (A) Figure 15: Output voltage ripple at nominal input voltage and rated load current (100 mV/div). Load capacitance: 1µF ceramic capacitor and 15µF tantalum capacitor. Bandwidth: 20 MHz. See Figure 12. Figure 16: Output voltage vs. load current showing typical current limit curves and converter shutdown points. Output Impedance (ohms) 10 1 0.1 Product #SQ60120EPB25 Phone 1-888-567-9596 48Vin 75Vin 0.001 Figure 17: Load current (20 A/div) as a function of time when the converter attempts to turn on into a 1 mΩ short circuit. Top trace 2 ms/div) is an expansion of the on-time portion of the bottom trace. 36Vin 0.01 10 100 1,000 Hz 10,000 100,000 Figure 18: Magnitude of incremental output impedance (Zout = Vout/Iout) for minimum, nominal, and maximum input voltage at full rated power. www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 8 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 Technical Figures 10 10 0 Forward Transmission (dB) -20 -30 -40 -50 -60 36Vin 48Vin -70 -80 Reverse Transmission (dB) 0 -10 75Vin 10 100 1,000 Hz 10,000 -20 -30 36Vin 48Vin -40 75Vin -50 100,000 Figure 19: Magnitude of incremental forward transmission (FT = Vout/Vin) for minimum, nominal, and maximum input voltage at full rated power. -10 10 100 1,000 10,000 100,000 Hz Figure 20: Magnitude of incremental reverse transmission (RT = Iin/Iout) for minimum, nominal, and maximum input voltage at full rated power. Input Impedance (ohms) 100 10 1 36Vin 48Vin 75Vin 0.1 10 100 1,000 10,000 100,000 Hz Figure 21: Magnitude of incremental input impedance (Zin = Vin/Iin) for minimum, nominal, and maximum input voltage at full rated power. Product #SQ60120EPB25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 9 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 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 a coarse 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(-). There are two versions of the converter that differ by the sense of the logic used for the ON/OFF input. 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 point 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. In the positive logic version, the ON/OFF input is active high (meaning that a high turns the converter on). 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. 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, 9V, 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. SynQor’s SQ BusQor modules accept the full 48/60V telecom bus voltage and have a narrow output voltage range compatible with many non-isolated point of load converters. 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. 3.3V 48Vdc 36-75V 2.5V BusQor Converter 12Vdc Vin(+) 1.8V +5V 5V 124k 1.5V 0.9V Typical User Board NiQor Converters ON/OFF 49.9k TTL Loads 100k 48Vdc Front End Vin(_) Figure A: Example of Intermediate Bus Architecture using BusQor bus converter and NiQor non-isolated converters Product #SQ60120EPB25 Phone 1-888-567-9596 Figure B: Internal ON/OFF pin circuitry www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 10 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 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” available on www.SynQor.com. 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 (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 Fig E. 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 of the BusQor will shutdown to zero volts after the 1ms have elapsed (see Fig C). The shutdown period lasts for a typical period of 200ms (Fig D) after which the BusQor tries to power up again. If the overload persists, the output voltage will go through repeated cycles of shutdown and restart with a duty cycle of 20ms (On) and 200ms (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. Output Short Circuit Protection: When the output of the BusQor module is shorted, a peak current of typically 35A will flow into the short circuit for a time of about 1ms. The output of the BusQor will shutdown to zero volts after the 1ms have elapsed (Fig C & D). The shutdown period lasts for a time of 200ms, at the end of which the BusQor module tries to power up again. If the short circuit persists, the output voltage will go through repeated cycles of shutdown and restart with a duty cycle of 20ms (On) and 200ms (Off) respectively. The BusQor module returns (auto resetting) to normal operation once the short circuit is removed. The BusQor is designed to survive in this mode indefinitely without damage and without human intervention. In the Auto resetting mode, also referred to as “Hiccup” mode, the power drawn from the 48V input is about 5W, most of which is dissipated into the external fault. It is important that copper traces and pads from the output circuit be designed to withstand the short term peaks, although the average current into the fault may be as low as 50mA typical. See Fig 17 for appropriate waveform. 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. Output Current Output Current 35A 25A Output Voltage Output Voltage <12V <12V 12V 0V 0V 1ms Time Figure C: Output Overload protection diagram (not to scale) Product #SQ60120EPB25 35A Peak peak Phone 1-888-567-9596 Time Shutdown 200ms Period Duty 20ms Cycle Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to scale) www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 11 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 Applications Section APPLICATION CONSIDERATIONS Startup Inhibit Period: Figure E details the Start-Up Inhibit Period for the BusQor module when Vin is applied with the On/Off pin asserted (enabled). Before time t1, when the input voltage Off pin asserted (enabled). 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 8ms from a Vin start-up. Once the module recognizes it should be on it waits an additional 4ms before it starts. When starting from an on/ off event the module has an inhibit time of 200ms like our standard products. The output builds up to 90% or higher of the nominal voltage and stabilizes to its nominal output voltage in a total time of 15ms typical. At time t2, when the On/Off pin is de-asserted (disabled), the BusQor module stops switching immediately. Fall time from 12V to 0V is dependent on output capacitance load current, 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 200ms typical. Vin UVLO On/Off (N logic) OFF ON t0 t1 t2 t t3 Vout 12V 12 ms Start-up Inhibit 200 ms Fault Inhibit Start-Up Time 15 ms Figure E: Power Up/Down Diagram (not to scale) showing Start-Up Inhibit Period. Refer to the Control Features section of the data sheet for details on enabling and disabling methods for N and P logic type modules. Product #SQ60120EPB25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 12 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 Applications Section Droop Current Sharing: This product has primary side regulation only. Primary side regulation results in a voltage droop as the load current increase (droop characteristic). The inherent impedance of the power stage due to its droop characteristic can be used to balance the load current between multiple modules that are placed in parallel. The graphs in this section show two units by way of example, but there is no fundamental limit to the number of units that can be placed in parallel. When multiple units having droop characteristics are placed in parallel, the current sharing accuracy is determined by the output voltage set point accuracy relative to the total output voltage droop for a given load current range. A difference in voltage between two units will cause a differential current to flow out of one unit and into the other. Figure F shows an example with two units with an output voltage mismatched by 0.5%. In this example, when Unit A is at 100% of its full rated load current, Unit B is only at 90%, effectively reducing the total available current by 5%. SynQor uses factory calibration of each unit to ensure that output voltage is well matched. Temperature Mismatch Self Balancing: the slope of the output voltage droop characteristic of semi regulated module increases with increased temperature. Therefore, if a paralleled unit were hotter than its neighbor because it is supplying more load current, then its output voltage will droop further forcing the cooler module(s) to increase its load current. The increase in effective output resistance due to an increase in temperature acts as a self correcting mechanism (Fig G) when two or more modules are connected in a parallel configuration. Droop Characteristics with Voltage Mismatch 0.0% -0.5% -0.50% Output Voltage Droop (% of Nominal) Output Voltage Droop (% of Nominal) Droop Characteristics with Temperature Mismatch (Self Balancing) 0.00% -1.0% -1.5% -2.0% -2.5% -3.0% -3.5% Unit A -1.00% -1.50% -2.00% -2.50% -3.00% -3.50% Unit A (cooler) Unit B Unit B (hotter) -4.00% -4.0% 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 0% 100% Figure F: Example of Droop Characteristic with Output Voltage Mismatch. Product #SQ60120EPB25 Phone 1-888-567-9596 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Load Current (% of Rated Value) Load Current (% of Rated Value) Figure G: Droop Characteristic with Temperature Mismatch (self balancing) www.synqor.com Doc.# 005-0006514 Rev. E 07/30/2015 Page 13 Input:36-75V Output:12V Current:25A Part No.:SQ60120EPB25 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. SQ 6 0 1 2 0 E P B 2 5 N R S - G 6/6 RoHS Options (see Ordering Information) Output Current Thermal Design Model Number Input Voltage SQ60120EPB25xyz 36-75V Output Voltage 12V Max Output Current 25A The following options must be included in place of the w x y z spaces in the model numbers listed above. Performance Level Package Size Not all combinations make valid part numbers, please contact SynQor for availability. Output Voltage Input Voltage Options Description: Product Family 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. Thermal Design Enable Logic Pin Style Feature Set B - Baseplated N - Negative P - Positive K - 0.110" N - 0.145" R - 0.180" Y - 0.250" 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 [email protected]. PATENTS Contact SynQor for further information and to order: Phone: Toll Free: Fax: E-mail: Web: Address: Product #SQ60120EPB25 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 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.# 005-0006514 Rev. E 07/30/2015 Page 14