DRQ-8/100-L48NBxxxx-C www.murata-ps.com Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter Output (V) Current (A) Nominal Input (V) 8.0 100 48 Optimized for distributed power Regulated Intermediate Bus Archi- tectures (RIBA), the DRQ-8/100-L48NBxxxx-C series offer regulated outputs in a quarter brick baseplate package. Typical unit FEATURES PRODUCT OVERVIEW „„ The DRQ-8/100-L48NB-C regulated converter The DRQ’s synchronous-rectifier topology and Regulated Intermediate Bus Architecture (RIBA) module deliver a 8.0V output @ Vin = 48Vdc in a fixed frequency operations means excellent effi- „„ 95.8% ultra-high efficiency at full load quarter brick open frame package at astonishing ciencies up to 95.8 %. „„ 36V-60V DC input range (48V nominal) efficiency. The fully isolated (1500Vdc) DRQ- A wealth of electronic protection features include „„ Monotonic startup into pre-bias output 8/100-L48NBxxxx-C series accept a 36 to 60 Volt input under voltage lockout, over voltage lockout conditions DC input voltage range and converts it to a low protection, output current limit, current sharing, „„ Over-current & Over-temperature protection Vdc output that drives external point-of-load (PoL) short circuit hiccup, Vout overshoot, and over DC-DC power converters such as Murata Power „„ Synchronous rectifier topology temperature shutdown. Available options include Solutions’ tiny Okami series which feature precise „„ Stable no-load operation various pin lengths and the baseplate. Assembled regulation directly at the load. Applications include using ISO-certified automated surface-mount „„ Up to +85° Celsius thermal performance (with datacom and telecom installations, cellular data- techniques, the DRQ series is designed to meet the derating) phone repeaters, base stations, instruments and applicable requirements of UL and IEC 60950- „„ Remote On/Off enable control embedded systems. Wideband output ripple and 1, EN55022/CISPR22 conducted emissions and noise is a low 100mV, peak-to-peak. „„ Fully isolated to 1500VDC UL94V-0 flammability. „„ Extensive protection features- UVLO, OVLO, OC, SC, OT „„ Complies with emissions and environmental requirements. „„ UL 60950-1, CAN/CSA C22.2 No. 60950-1 Certification 4 Vout(-) 4 Vout(+) Vin(-) 3 5 Vout(-) Vin(-) 3 5 Vout(-) Vin(-) 3 5 Vout(-) Enable 2 Enable 2 Enable 2 7 Vout(+) 7 Vout(+) 7 Vout(+) Vin(+) 1 Vin(+) 1 Vin(+) 1 8 Vout(+) 8 Vout(-) Standard Configuration A Option Z Option Figure 1. Bottom View of typical unit Pin-out Options For full details go to www.murata-ps.com/rohs www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 1 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output Input Ripple & Noise Total (mVp-p) Efficiency Dimensions with baseplate VOUT IOUT Power VIN Nom. Range IIN, no load IIN, full load Root Model ➀ (V) (A, max) (W) Max. (V) (V) (mA) (A) Typ. Case (inches) Case (mm) DRQ-8/100-L48NB-C 8.0 100 800 150 48 36-60 200 20 95.8% 2.3 x 1.45 x 0.57 58.42 x 36.83 x 14.47 ➀ Please refer to the part number structure for additional options and complete ordering part numbers. ➁ All specifications are at nominal line voltage and full load, +25 ºC. unless otherwise noted. See detailed specifications. Cout = 700µF, approximately 50% ceramic, 50% Oscon or POSCAP. I/O caps are necessary for our test equipment and may not be needed for your application. PART NUMBER STRUCTURE DR Q - 8 / 100 - L48 N B A S L1 - C RoHS 6/6 Compliant Digital Control - Regulated Blank = Standard pin length 0.180 in. (4.6mm) L1 = 0.110 in. (2.79mm) Q = Quarter-Brick L2 = 0.145 in. (3.68mm) Nominal Output Voltage Voltage in Volts (V) Blank = No Load Share (Standard Configuration) S = Load Sharing Option Maximum Rated Output Currrent Current in Amps (A) Input Voltage Range Blank = Dual Output Pins (++/--) (Standard Configuration, See Mechanical Drawing) L48 = 36V-60V A = Single Output Pins (See Mechanical Drawings) (Nom. = 48V) Z = Dual Output Pins (+-/+-) (See Mechanical Drawings) Baseplate (Standard Configuration) N= Negative Logic (Standard Configuration) Note: Some model number P=Positive Logic combinations will be special order only. See website or contact your local Murata sales representative. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 2 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter FUNCTIONAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Conditions Minimum Typical/Nominal Maximum Units Input Voltage, Continuous   36 48 60 Vdc Input Voltage, Transient 100 mS max. duration 75 Vdc Isolation Voltage Input to output 1500 Vdc   On/Off Remote Control Referred to -Vin   20 Vdc Output Power   0   800 W Output Current Current-limited, no damage, short-circuit protected 0   100 A Storage Temperature Range Vin = Zero (no power) -55   125 °C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied nor recommended. INPUT Operating Input Voltage Range 36 48 60 Vdc Start up Voltage 33.0 34.5 36.0 Vdc Undervoltage Shutdown 31.0 32.5 34.0 Vdc UVLO Hysteresis 1.50 4.00 Vdc Overvoltage Shutdown 76.0 80.0 84.0 Vdc Overvoltage Shutdown Recover latch Vdc Internal Filter Type     Pi     External Input fuse     35 A External Input Capacitance 140 800 µF Input current Full Load Conditions Vin = nominal   17.30 20.00 A Low Line input current Vin = minimum   23.20 25.00 A 50 % of Iin Inrush Current ➄ Short Circuit input current     0.8   A No Load input current Iout = minimum, unit=ON   200 400 mA Shut-Down input currrent(Off, UV, OT)     20 50 mA Back Ripple Current     1000 mArms GENERAL and SAFETY Efficiency Vin=48V, full load 95.0 95.8   % Input to output 1500   Vdc Isolation Voltage(Test Voltage) Input to Baseplate 1000   Vdc Output to Baseplate 1000   Vdc Insulation Safety Rating     Operational     Isolation Capacitance     1000   pF Certified to UL-60950-1, CSA-C22.2 No.60950-1, IEC/ Safety       EN60950-1, 2nd edition Flammability UL94 V-0 Per Telcordia SR-332, Issue 3, Method 1, Class 1, Ground 3 Calculated MTBF   4800   Hours x 10 Fixed, Tcase=+40°C DYNAMIC CHARACTERISTICS Switching Frequency     220   KHz Turn On Time Time from Vin reaching UVLO to Vout reaching 10% of Vin Startup Delay 20  25 30 mS Vout_nominal Time from enable edge to Vout reaching 10% of Enable Startup Delay   2.5  5 mS Vout_nominal Vout Rise Time From 0%~100%       15 mS 50-75-50%, 1A/uS, 4uF/W of external output capacitance, Dynamic Load Response   500 µS within 1% of Vout Dynamic Load Peak Deviation same as above     ±350 mV FEATURES and OPTIONS Conditions Minimum Typical/Nominal Maximum Units Remote On/Off Control Primary On/Off control (designed to be driving with an open collector logic, Voltages referenced to -Vin) “N” suffix: Negative Logic, ON state ON = ground pin or external voltage -0.1   0.8 Vdc Negative Logic, OFF state OFF = pin open or external voltage 2.4   20 Vdc Control Current open collector/drain   0.2 mA “P” suffix Positive Logic, OFF state OFF = ground pin or external voltage -0.1 0.8 Vdc Positive Logic, ON state ON = pin open or external voltage 2.4 20 Vdc Control Current : open collector/drain 0.2 mA www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 3 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter FUNCTIONAL SPECIFICATIONS (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power   0 800 800 W Voltage Output Voltage: Standard Option 7.90 8.00 8.10 Vdc Setting Accuracy At 0% Load, No Trim, All Conditions 7.97 8.00 8.03 Vdc Setting Accuracy At 50% Load, No Trim, All Conditions 7.90 8.00 8.10 Vdc Setting Accuracy At 100% Load, No Trim, All Conditions 7.90 8.00 8.10 Vdc Overvoltage Protection   9.50 10.00 10.50 Vdc Current Output Current Range   0 100 100 A Minimum Load     No minimum load     Current Limit Inception 90% of Vout 110  120 130 A Short Circuit Short Circuit Duration Output shorted to ground, no damage   Continuous     (remove short for recovery) Short circuit protection method Hiccup current limiting   Non-latching     Regulation Line Regulation Vin = 36-60, Vout = nom., full load     ±0.5 % Load Regulation (No droop) Iout = min. to max., Vin = nom.     ±0.5 % 20 MHz BW, Cout=700µF, 50% ceramic, Ripple and Noise   100 150 mV pk-pk 50% OSCON or POSCAP. Temperature Coefficient (No droop) At all outputs   0.02 % of Vnom./°C Output Capacitance 0 10,000 μF MECHANICAL     2.3 x 1.45 x 0.57   Inches Outline Dimensions (with baseplate)     58.4 x 36.83 x 14.47   mm     3.14   Ounces Weight (with baseplate)     80   Grams     0.06 & 0.04   Inches Through Hole Pin Diameter     1.524 & 1.016   mm Through Hole Pin Material     Copper alloy     Nickel subplate   98.4-299   µ-inches TH Pin Plating Metal and Thickness Gold overplate   4.7-19.6   µ-inches ENVIRONMENTAL Operating Ambient Temperature Range with derating -40   85 °C Operating Baseplate Temperature  no derating required -40   120 °C Storage Temperature Vin = Zero (no power) -55   125 °C Thermal Protection/Shutdown (with Case temperature, measured in the center 130 °C “B” Suffix) Electromagnetic Interference External filter required; see   B   Class Conducted, EN55022/CISPR22 emissions performance test. RoHS rating     RoHS-6     Notes ➀ Unless otherwise noted, all specifications apply over the input voltage range, full temperature ➁ Measured at input pin with maximum specified Cin and <500µH inductance between voltage range, nominal output voltage and full output load. General conditions are near sea level altitude, source and Cin heat sink installed and natural convection airflow unless otherwise specified. All models are ➂ All models are stable and regulate to specification under no load. tested and specified with external parallel 1 µF and 10 µF multi-layer ceramic output capacitors. ➃ The Remote On/Off Control is referred to -Vin. No external input capacitor is used (see Application Notes). All capacitors are low-ESR types ➄ Inrush Current is defined as the peak current drawn by the Unit when Unit is enabled after Vin wired close to the converter. These capacitors are necessary for our test equipment and may not is present. Iin is defined as the steady-state operating current when Unit is operating at Vin Max be needed in the user’s application. and Rated Power. While Vout is rising, Pout is ≤25% of Rated Power with a resistive load. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 4 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter PERFORMANCE DATA Efficiency vs. Line Voltage and Load Current @ +25°C Power Loss vs. Line Voltage and Load Current @ +25°C 98.00 45 40 96.00 35 94.00 30 92.00 25 90.00 20 88.00 15 Vin=36V 86.00 Vin = 36V 10 Vin=48V Vin = 48V 84.00 5 Vin=60V Vin = 60V 0 82.00 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 Load Current (Amps) Load Current (Amps) Dual Output Pins Maximum Current Temperature Derating at sea level Single Output Pins Maximum Current Temperature Derating at sea level (Vin = 48V, airflow from Vin to Vout, with heatsink)* (Vin = 48V, airflow from Vin to Vout, with heatsink)* 105 105 95 95 85 85 75 75 65 65 55 55 100LFM 100LFM 200LFM 200LFM 45 45 300LFM 300LFM 35 35 400LFM 400LFM 25 25 500LFM 500LFM 600LFM 600LFM 15 15 5 5 40 45 50 55 60 65 70 75 80 85 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (ºC) Ambient Temperature (ºC) Dual Output Pins Maximum Output Power Temperature Derating at sea level Single Output Pins Maximum Output Power Temperature Derating at sea level (Vin = 48V, airflow from Vin to Vout, with heatsink)* (Vin = 48V, airflow from Vin to Vout, with heatsink)* 850 850 800 800 750 750 700 700 650 650 600 600 550 550 100LFM 100LFM 500 500 200LFM 200LFM 450 450 300LFM 300LFM 400 400 400LFM 400LFM 350 350 500LFM 500LFM 300 300 600LFM 600LFM 250 250 200 200 40 45 50 55 60 65 70 75 80 85 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (ºC) Ambient Temperature (ºC) See Page 8 for heatsink information. NOTE: The heatsink is not available as an option. It is only used in the thermal testing of this device. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 5 of 16 Output Power (W) Output Current (Amps) Efficiency (%) Output Current (Amps) Output Power (W) Power Dissipation (W) DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter PERFORMANCE DATA Enable Startup Delay (Vin = 48V, Iout = 100A, Cout = 0μF, Ta = +25°C) Startup Delay (Vin = 48V, Iout = 100A, Cout = 0μF, Ta = +25°C) Top Trace = Vout, Bottom Trace = Enable, 5mS/div Top Trace = Vout, Bottom Trace = Vin, 10mS/div Stepload Transient Response Stepload Transient Response (Vin = 48V, Iout = 25-75-25% of Iout, Cload = 3200μF, Ta = +25°C, 2mS/div) (Vin = 48V, Iout = 50-75-50% of Iout, Cload = 3200μF, Ta = +25°C, 2mS/div) Output Ripple & Noise @20MHz Output Ripple & Noise @20MHz (Vin = 48V, Iout = 0A, Cout = 700μF, Ta = +25°C, 2μS/div) (Vin = 48V, Iout = 100A, Cout = 700μF, Ta = +25°C, 2μS/div) www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 6 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter PERFORMANCE DATA Current Share@ +25°C 120 100 80 60 40 Brick 1 20 Brick 2 0 100 110 120 130 140 150 160 170 180 190 200 Total Output Current (Amps) www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 7 of 16 Output Current, each brick (Amps) DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter MECHANICAL SPECIFICATIONS (THROUGH-HOLE MOUNT) BOTTOM VIEW Dual Output Pins TOP VIEW Baseplate Option BOTTOM VIEW SIDE VIEW Single Output Pins (’A’ option) SEE NOTE 4 Pin Material Dimensions are in inches (mm shown for ref. only). Third Angle Projection Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ Components are shown for reference only and may vary between units. INPUT/OUTPUT CONNECTIONS INPUT/OUTPUT CONNECTIONS INPUT/OUTPUT CONNECTIONS A Option Z Option Standard (Blank) Option PIN FUNCTION PIN FUNCTION PIN FUNCTION PIN FUNCTION PIN FUNCTION PIN FUNCTION 1 Vin(+) 5 Vout(-) 1 Vin(+) 5 Vout(-) 1 Vin(+) 5 Vout(-) 2 Enable 2 Enable 2 Enable 3 Vin(-) 7 Vout(+) 3 Vin(-) 7 Vout(+) 3 Vin(-) 7 Vout(+) 4 Vout(+) 8 Vout(-) 4 NA 8 NA 4 Vout(-) 8 Vout(+) www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 8 of 16 Min DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter MECHANICAL SPECIFICATIONS (THROUGH-HOLE MOUNT) Recommended Footprint Recommended Footprint Single Output Pins Dual Output Pins TOP VIEW Baseplate+Heatsink Option* Baseplate Option SIDE VIEW SEE NOTE 4 SEE NOTE 4 Dimensions are in inches (mm shown for ref. only). Third Angle Projection BOTTOM VIEW Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ Components are shown for reference only and may vary between units. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 9 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT INPUT END OF CONVERTERS OUTPUT END OF (ALL .040" PINS) CONVERTERS (.062" PINS WITH OR WITHOUT ADDITIONAL .040" PINS) 1/4" HOLE IN ONE CORNER OF FOAM TRAY ADDED TO VISUALLY CONTROL CONVERTER ORIENTATIONS THIS HOLE WILL ALWAYS BE PLACED IN UPPER LEFT CORNER OF CARTON AS SHOWN MPQ = 30 UPPER LEFT CORNER OF CARTON SHIPPING TRAY DIMENSIONS DRQ modules are supplied in a 15-piece (5 x 3) shipping tray. The tray is an anti-static closed-cell polyethylene foam. Dimensions are shown below. 9.92±.04 30 x .39 .38 .25 x .57 3x .25 X 45° A MIN DEEP .38 2.00 2.40 .20 9.92±.04 6.050 3.025 .73 .74 A 1.825 1.31 1.45 REF 4 EQ SPACES 15x R.25 @ 1.825 EACH = 7.30 NOTES: 1. MATERIAL: DOW ETHAFOAM SELECT ANTI-STATIC, COLOR PINK, LOW DENSITY CLOSED CELL POLYETHYLENE FOAM 2. ALL DIMENISONS IN INCHES 3. ASSEMBLY CONSISTS OF DIE-CUT FRAME WITH 'SOLID' BASE, GLUED TOGETHER. GLUE NOT PERMITTED WITHIN CUTOUT POCKETS. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 10 of 16 INPUTPINS OUTPUTPINS DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter But if you attempt to measure the current in one of the converters using a TECHNICAL NOTES series shunt, remember that the current meter itself may introduce enough Load Sharing finite resistance to affect the readings. (Hint: Use a non-contacting “clamp-on” Load sharing occurs when two or more DRQ-8/100-L48NB-Cs are connected Hall effect DC current meter with zero IR loss.) in parallel at both the input and output terminals to supply greater output cur- [4] If you add the optional input filters, use identical components with the rent than one unit alone or to offer system redundancy for moderate loads. If same layout. one converter fails, the other converter(s) will carry the load until the system is repaired. [5] Operate both converters in the same temperature and airflow environ- ment. Under load sharing, small differences in cooling can amplify into load The DRQ-8/100-L48NB-C’s design allows load sharing using the “droop” imbalances. method, also called the “direct connect” technique. Simply put, at light loads, the converter with slightly higher output voltage will carry more of the output [6] Avoid operation near the low input voltage limit of the converter. Another current. Since the DRQ-8/100-L48NB-C’s synchronous rectifier design will not subtle factor here is the external source impedance of the input supply. A accept appreciable reverse output current, starting at zero load, the DRQ- source with higher source impedance at full load may make the net input 8/100-L48NB-C with the higher output voltage will carry more of the full load voltage seen by the converter close to its minimum input voltage. Be sure to until the voltage at the output drops to that of the lower DRQ-8/100-L48NB-C’s. account for the decrease in effective input voltage under load. Load Sharing Guidelines For battery sources, this means that the batteries should be freshly charged and that the AC trickle charger is in good working order. Note that older batter- If you wish to operate two or more DRQ-8/100-L48NB-C’s in load sharing, use these guidelines: ies increase their internal cell impedance even if their no-load output voltage appears acceptable. Remember that what counts here is the voltage seen at [1] Operate both converters connected in parallel to the same 48V input the DRQ-8/100-L48NB-C input connections with full current. power source. This simplifies the design and makes more balanced power sharing. Using two different 48V input supplies must be carefully analyzed to [7] As with any system design, thoroughly test the DRQ-8/100-L48NB-C’s avoid overloading one of the converters and is not recommended. connected in load sharing before committing the design to a real application. CAUTION – This converter is not internally fused. To avoid danger to persons or equipment and to retain safety certification, the user must connect an VIN VOUT DRQ1 RBQ 1 external fast-blow input fuse as listed in the specifications. Be sure that the PC board pad area and etch size are adequate to provide enough current so that +Vout the fuse will blow with an overload. +48V POWER ILOAD RLOAD Start Up Considerations SOURCE VIN VOUT DRQ2 RBQ 2 When power is first applied to the DC/DC converter, there is some risk of start up difficulties if you do not have both low AC and DC impedance and adequate regulation of the input source. Make sure that your source supply does not allow the instantaneous input voltage to go below the minimum voltage at all OPTIONAL INPUT FILTERS times. Figure 2. Load Sharing Block Diagram Use a moderate size capacitor very close to the input terminals. You may need two or more parallel capacitors. A larger electrolytic or ceramic cap sup- Make sure the single 48V input source can supply the total current needed plies the surge current and a smaller parallel low-ESR ceramic cap gives low by all the parallel-connected DRQ-8/100-L48NB-C’s. (Actually, it is possible AC impedance. to rate the full system at more than the current capacity of a single DRQ- Remember that the input current is carried both by the wiring and the 8/100-L48NB-C. However, you now lose the redundancy protection feature.) ground plane return. Make sure the ground plane uses adequate thickness [2] Use conservative loading. Do not assume for example that two parallel copper. Run additional bus wire if necessary. DRQ-8/100-L48NB-C’s can always supply “times two” amounts of output cur- On/Off Control rent. Allow for limits in input voltage and other factors. The input-side, remote On/Off Control function (pin 2) can be ordered to oper- If one DRQ-8/100-L48NB-C overloads while in load share, it will protect ate with either logic type: itself by entering the overcurrent mode. If the whole system is running close Negative (“N” suffix): Negative-logic devices are off when pin 2 is left open to maximum output current, the remaining good DRQ-8/100-L48NB-C will (or pulled high, applying +2.4V to 20V), and on when pin 2 is pulled low (-0.1V soon also enter overcurrent mode. These two events probably will not happen to 0.8V) with respect to –Input as shown in Figure 3. together, possibly leaving the system operating in degraded mode for awhile. The solution here is conservative design to avoid getting close to the load limits. [3] Make the input wiring lengths and wire gauges identical on both inputs and outputs. If in doubt, make some precision measurements under full load. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 11 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter Positive (“P” suffix): Positive-logic devices are on when pin 2 is left open (or Threshold. This built-in hysteresis prevents any unstable on/off operation at a pulled high, applying +2.4V to +20V), and off when pin 2 is pulled low (-0.1V to single input voltage. 0.8V) with respect to –Input as shown in Figure 3. Start-Up Time Dynamic control of the remote on/off function is best accomplished with Assuming that the output current is set at the rated maximum, the Vin to Vout a mechanical relay or an open-collector/open-drain drive circuit (optically Start-Up Time (see Specifications) is the time interval between the point when isolated if appropriate). The drive circuit should be able to sink appropriate cur- the rising input voltage crosses the Start-Up Threshold and the fully loaded rent (see Performance Specifications) when activated and withstand appropri- output voltage enters and remains within its specified accuracy band. Actual ate voltage when deactivated. Applying an external voltage to pin 2 when no measured times will vary with input source impedance, external input capaci- input power is applied to the converter can cause permanent damage to the tance, input voltage slew rate and final value of the input voltage as it appears converter. at the converter. Input Fusing These converters include a soft start circuit to moderate the duty cycle of its Certain applications and/or safety agencies may require fuses at the inputs of PWM controller at power up, thereby limiting the input inrush current. power conversion components. Fuses should also be used when there is the The On/Off Remote Control interval from On command to Vout (final ±5%) assumes that the converter already has its input voltage stabilized above the Start-Up Threshold before the On command. The interval is measured from the +VIN +VCC On command until the output enters and remains within its specified accuracy band. The specification assumes that the output is fully loaded at maximum rated current. Similar conditions apply to the On to Vout regulated specification such as external load capacitance and soft start circuitry. ON/OFF CONTROL Recommended Input Filtering The user must assure that the input source has low AC impedance to provide dynamic stability and that the input supply has little or no inductive content, –VIN including long distributed wiring to a remote power supply. The converter will operate with no additional external capacitance if these conditions are met. For best performance, we recommend installing a low-ESR capacitor Figure 3. Driving the Negative Logic On/Off Control Pin immediately adjacent to the converter’s input terminals. The capacitor should be a ceramic type such as the Murata GRM32 series or a polymer type. Make sure that the input terminals do not go below the undervoltage shutdown volt- possibility of sustained input voltage reversal which is not current-limited. For age at all times. More input bulk capacitance may be added in parallel (either greatest safety, we recommend a fast blow fuse installed in the ungrounded electrolytic or tantalum) if needed. input supply line. Recommended Output Filtering Input Under-Voltage Shutdown and Start-Up Threshold The converter will achieve its rated output ripple and noise with no additional Under normal start-up conditions, converters will not begin to regulate properly external capacitor. However, the user may install more external output capaci- until the rising input voltage exceeds and remains at the Start-Up Threshold tance to reduce the ripple even further or for improved dynamic response. Voltage (see Specifications). Once operating, converters will not turn off until Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors. the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent Mount these close to the converter. Measure the output ripple under your load restart will not occur until the input voltage rises again above the Start-Up conditions. Use only as much capacitance as required to achieve your ripple and noise Fuse objectives. Excessive capacitance can make step load recovery sluggish or +VIN +VIN +VO possibly introduce instability. Do not exceed the maximum rated output capaci- tance listed in the specifications. RLOAD Input Ripple Current and Output Noise All models in this converter series are tested and specified for input reflected ripple current and output noise using designated external input/output com- –VIN –VIN –VO ponents, circuits and layout as shown in the figures below. The Cbus and Lbus Figure 4. Input Fusing components simulate a typical DC voltage bus. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 12 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter Minimum Output Loading Requirements you thoroughly understand the enclosure geometry, entry/exit orifice areas and the fan flowrate specifications. All models regulate within specification and are stable under no load to full load conditions. Operation under no load might however slightly increase CAUTION: If you exceed these Derating guidelines, the converter may have output ripple and noise. an unplanned Over Temperature shut down. Also, these graphs are all collected near Sea Level altitude. Be sure to reduce the derating for higher altitude. Thermal Shutdown To prevent many over temperature problems and damage, these converters Output Fusing include thermal shutdown circuitry. If environmental conditions cause the The converter is extensively protected against current, voltage and temperature temperature of the DC/DC’s to rise above the Operating Temperature Range extremes. However your output application circuit may need additional protec- up to the shutdown temperature, an on-board electronic temperature sensor tion. In the extremely unlikely event of output circuit failure, excessive voltage will power down the unit. When the temperature decreases below the turn-on could be applied to your circuit. Consider using an appropriate fuse in series threshold, the converter will automatically restart. There is a small amount of with the output. hysteresis to prevent rapid on/off cycling. Output Current Limiting CAUTION: If you operate too close to the thermal limits, the converter may Current limiting inception is defined as the point at which full power falls below shut down suddenly without warning. Be sure to thoroughly test your applica- the rated tolerance. See the Performance/Functional Specifications. Note par- tion to avoid unplanned thermal shutdown. ticularly that the output current may briefly rise above its rated value in normal Temperature Derating Curves operation as long as the average output power is not exceeded. This enhances reliability and continued operation of your application. If the output current is The graphs in this data sheet illustrate typical operation under a variety of too high, the converter will enter the short circuit condition. conditions. The Derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable Output Short Circuit Condition under increasing forced airflow measured in Linear Feet per Minute (“LFM”). When a converter is in current-limit mode, the output voltage will drop as the Note that these are AVERAGE measurements. The converter will accept brief output current demand increases. If the output voltage drops too low (approxi- increases in current or reduced airflow as long as the average is not exceeded. mately 97% of nominal output voltage for most models), the PWM controller Note that the temperatures are of the ambient airflow, not the converter will shut down. Following a time-out period, the PWM will restart, causing itself which is obviously running at higher temperature than the outside air. the output voltage to begin rising to its appropriate value. If the short-circuit condition persists, another shutdown cycle will initiate. This rapid on/off cycling Murata Power Solutions makes Characterization measurements in a closed is called “hiccup mode.” The hiccup cycling reduces the average output cur- cycle wind tunnel with calibrated airflow. We use both thermocouples and an rent, thereby preventing excessive internal temperatures and/or component infrared camera system to observe thermal performance. As a practical matter, damage. it is quite difficult to insert an anemometer to precisely measure airflow in most applications. Sometimes it is possible to estimate the effective airflow if TO CURRENT OSCILLOSCOPE PROBE +VIN +VOUT LBUS + – VIN CIN RLOAD C1 SCOPE + C2 – -VIN -VOUT CIN = 300µF, ESR < 700mΩ @ 100kHz LBUS = <500µH C1 = 1µF Figure 5. Measuring Input Ripple Current C2 = 10µF LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 6. Measuring Output Ripple and Noise (PARD) www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 13 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter The “hiccup” system differs from older latching short circuit systems We strive to have all technical data in this customer data sheet highly accu- because you do not have to power down the converter to make it restart. The rate and complete. This customer data sheet is revision-controlled and dated. system will automatically restore operation as soon as the short circuit condi- The latest customer data sheet revision is normally on our website (www tion is removed. .murata-ps.com) for products which are fully released to Manufacturing. Please be especially careful using any data sheets labeled “Preliminary” since data Output Capacitive Load may change without notice. These converters do not require external capacitance added to achieve rated specifications. Users should only consider adding capacitance to reduce switching noise and/or to handle spike current load steps. Install only enough capacitance to achieve noise objectives. Excess external capacitance may cause degraded transient response and possible oscillation or instability. NOTICE—Please use only this customer data sheet as product documentation when laying out your printed circuit boards and applying this product into your application. Do NOT use other materials as official documentation such as adver- tisements, product announcements, or website graphics. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 14 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter Emissions Performance, Model DRQ-8/100-L48NB-C [3] Conducted Emissions Test Results Murata Power Solutions measures its products for radio frequency emissions against the EN 55022 and CISPR 22 standards. Passive resistance loads are employed and the output is set to the maximum voltage. If you set up your own emissions testing, make sure the output load is rated at continuous power while doing the tests. The recommended external input and output capacitors (if required) are included. Please refer to the fundamental switching frequency. All of this information is listed in the Product Specifications. An external discrete filter is installed and the circuit diagram is shown below. VCC RTN L1 L2 C1 C2 C3 C4 C5 + + LOAD C6 C7 C12 DC/DC -48V GND C8 C9 C10 C11 Graph 1. Conducted emissions performance, Positive Line, CISPR 22, Class B, full load GND Figure 7. Conducted Emissions Test Circuit [1] Conducted Emissions Parts List Reference Part Number Description Vendor SMD CERAMIC-100V- C1, C2, C3, C4, C5 GRM32ER72A105KA01L Murata 1000nF-X7R-1210 SMD CERAMIC100V-100nF- C6 GRM319R72A104KA01D Murata ±10%-X7R-1206 COMMON MODE-473uH- L1, L2 PG0060T Pulse ±25%-14A SMD CERAMIC630V-0.22uF- C8, C9, C10, C11 GRM55DR72J224KW01L Murata ±10%-X7R-2220 Aluminum100V-220Uf- C7 UHE2A221MHD Nichicon ±10%-long lead C12 NA Graph 2. Conducted emissions performance, Negative Line, CISPR 22, Class B, full load [2] Conducted Emissions Test Equipment Used Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153 [4] Layout Recommendations Most applications can use the filtering which is already installed inside the 2Line V-networks LS1-15V 50Ω/50Uh Line Impedance Stabilization Network converter or with the addition of the recommended external capacitors. For greater emissions suppression, consider additional filter components and/or shielding. Emissions performance will depend on the user’s PC board layout, the chassis shielding environment and choice of external components. Please refer to Application Note GEAN-02 for further discussion. Since many factors affect both the amplitude and spectra of emissions, we recommend using an engineer who is experienced at emissions suppression. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 15 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter Vertical Wind Tunnel Murata Power Solutions employs a computer controlled custom-designed closed loop vertical wind tunnel, infrared video camera system, and test instrumentation for accurate airflow and heat dissipation analysis of power products. IR Transparent The system includes a precision low flow-rate anemometer, optical window Variable variable speed fan, power supply input and load controls, Unit under speed fan temperature gauges, and adjustable heating element. test (UUT) The IR camera monitors the thermal performance of the IR Video Unit Under Test (UUT) under static steady-state conditions. A Camera special optical port is used which is transparent to infrared wavelengths. Both through-hole and surface mount converters are soldered down to a 10" x 10" host carrier board for realistic heat absorption and spreading. Both longitudinal and trans- Heating verse airflow studies are possible by rotation of this carrier element board since there are often significant differences in the heat Precision dissipation in the two airflow directions. The combination of low-rate adjustable airflow, adjustable ambient heat, and adjustable anemometer Input/Output currents and voltages mean that a very wide 3” below UUT range of measurement conditions can be studied. The collimator reduces the amount of turbulence adjacent Ambient to the UUT by minimizing airflow turbulence. Such turbu- temperature lence influences the effective heat transfer characteristics sensor and gives false readings. Excess turbulence removes more heat from some surfaces and less heat from others, possibly Airflow causing uneven overheating. collimator Both sides of the UUT are studied since there are different thermal gradients on each side. The adjustable heating element and fan, built-in temperature gauges, and no-contact IR camera mean that power supplies are tested in real-world conditions. Figure 8. Vertical Wind Tunnel Soldering Guidelines Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifica- tions may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers. Wave Solder Operations for through-hole mounted products (THMT) For Sn/Ag/Cu based solders: For Sn/Pb based solders: Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C. Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C. Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Refer to: http://www.murata-ps.com/requirements/ ISO 9001 and 14001 REGISTERED Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2017 Murata Power Solutions, Inc. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02∆ Page 16 of 16