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 Architectures (RIBA), the DRQ-8/100-L48NBxxxx-C series offer regulated outputs in a quarter brick baseplate package. Typical unit FEATURES PRODUCT OVERVIEW Regulated Intermediate Bus Architecture (RIBA) The DRQ-8/100-L48NB-C regulated converter module deliver a 8.0V output @ Vin = 48Vdc in a quarter brick open frame package at astonishing efficiency. The fully isolated (1500Vdc) DRQ8/100-L48NBxxxx-C series accept a 36 to 60 Volt DC input voltage range and converts it to a low Vdc output that drives external point-of-load (PoL) DC-DC power converters such as Murata Power Solutions' tiny Okami series which feature precise regulation directly at the load. Applications include datacom and telecom installations, cellular dataphone repeaters, base stations, instruments and embedded systems. Wideband output ripple and noise is a low 100mV, peak-to-peak. 95.8% ultra-high efficiency at full load 36V-60V DC input range (48V nominal) Monotonic startup into pre-bias output conditions Over-current & Over-temperature protection Synchronous rectifier topology Stable no-load operation Up to +85 Celsius thermal performance (with derating) Remote On/Off enable control Fully isolated to 1500VDC The DRQ's synchronous-rectifier topology and fixed frequency operations means excellent efficiencies up to 95.8 %. A wealth of electronic protection features include input under voltage lockout, over voltage lockout protection, output current limit, current sharing, short circuit hiccup, Vout overshoot, and over temperature shutdown. Available options include various pin lengths and the baseplate. Assembled using ISO-certified automated surface-mount techniques, the DRQ series is designed to meet the applicable requirements of UL and IEC 609501, EN55022/CISPR22 conducted emissions and 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(-) 5 Vout(-) Vin(-) 3 5 Vout(-) Vin(-) 3 Enable 2 Enable 2 Enable 2 7 Vout(+) Vin(+) 1 5 Vout(-) Vin(-) 3 7 Vout(+) Vin(+) 1 7 Vout(+) 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 Root Model VOUT (V) IOUT (A, max) Total Power (W) DRQ-8/100-L48NB-C 8.0 100 800 Input Ripple & Noise (mVp-p) VIN Nom. Max. (V) 150 48 Range (V) IIN, no load IIN, full load Efficiency (mA) (A) Typ. 36-60 200 20 95.8% Dimensions with baseplate Case (inches) Case (mm) 2.3 x 1.45 x 0.57 58.42 x 36.83 x 14.47 Please refer to the part number structure for additional options and complete ordering part numbers. All specifications are at nominal line voltage and full load, +25 C. unless otherwise noted. See detailed specifications. Cout = 700F, 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) L2 = 0.145 in. (3.68mm) Q = Quarter-Brick Nominal Output Voltage Voltage in Volts (V) Maximum Rated Output Currrent Blank = No Load Share (Standard Configuration) S = Load Sharing Option Current in Amps (A) Input Voltage Range L48 = 36V-60V (Nom. = 48V) Blank = Dual Output Pins (++/--) (Standard Configuration, See Mechanical Drawing) A = Single Output Pins (See Mechanical Drawings) Z = Dual Output Pins (+-/+-) (See Mechanical Drawings) Baseplate (Standard Configuration) N= Negative Logic (Standard Configuration) P=Positive Logic Note: Some model number 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 Start up Voltage Undervoltage Shutdown UVLO Hysteresis Overvoltage Shutdown Overvoltage Shutdown Recover Internal Filter Type External Input fuse External Input Capacitance Input current Full Load Conditions Low Line input current Inrush Current Short Circuit input current No Load input current Shut-Down input currrent(Off, UV, OT) Back Ripple Current 36 33.0 31.0 1.50 76.0 48 34.5 32.5 80.0 60 36.0 34.0 4.00 84.0 Vdc Vdc Vdc Vdc Vdc Vdc 35 800 A F 20.00 25.00 50 A A % of Iin A mA mA mArms latch Pi 140 Vin = nominal Vin = minimum 17.30 23.20 Iout = minimum, unit=ON 0.8 200 20 400 50 1000 GENERAL and SAFETY Efficiency Vin=48V, full load Input to output Input to Baseplate Output to Baseplate Isolation Voltage(Test Voltage) 95.0 1500 1000 1000 Insulation Safety Rating Isolation Capacitance Safety Flammability Calculated MTBF Certified to UL-60950-1, CSA-C22.2 No.60950-1, IEC/ EN60950-1, 2nd edition UL94 V-0 Per Telcordia SR-332, Issue 3, Method 1, Class 1, Ground Fixed, Tcase=+40C 95.8 % Vdc Vdc Vdc Operational 1000 pF 4800 Hours x 103 220 KHz DYNAMIC CHARACTERISTICS Switching Frequency Turn On Time Vin Startup Delay Enable Startup Delay Time from Vin reaching UVLO to Vout reaching 10% of Vout_nominal Time from enable edge to Vout reaching 10% of Vout_nominal 20 25 30 mS 2.5 5 mS 15 mS 500 S Vout Rise Time From 0%~100% Dynamic Load Response Dynamic Load Peak Deviation 50-75-50%, 1A/uS, 4uF/W of external output capacitance, within 1% of Vout same as above FEATURES and OPTIONS Conditions 350 mV Maximum Units -0.1 2.4 0.8 20 0.2 Vdc Vdc mA -0.1 2.4 0.8 20 0.2 Vdc Vdc mA Minimum 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 Negative Logic, OFF state OFF = pin open or external voltage Control Current open collector/drain "P" suffix Positive Logic, OFF state OFF = ground pin or external voltage Positive Logic, ON state ON = pin open or external voltage Control Current : open collector/drain Typical/Nominal 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 Total Output Power Voltage Output Voltage: Standard Option Setting Accuracy Setting Accuracy Setting Accuracy Overvoltage Protection Current Output Current Range Minimum Load Current Limit Inception Short Circuit Short Circuit Duration (remove short for recovery) Short circuit protection method Regulation Line Regulation Load Regulation (No droop) Ripple and Noise Temperature Coefficient (No droop) Output Capacitance Conditions At 0% Load, No Trim, All Conditions At 50% Load, No Trim, All Conditions At 100% Load, No Trim, All Conditions 90% of Vout Minimum Typical/Nominal Maximum Units 0 800 800 W 7.90 7.97 7.90 7.90 9.50 8.00 8.00 8.00 8.00 10.00 8.10 8.03 8.10 8.10 10.50 Vdc Vdc Vdc Vdc Vdc 0 100 No minimum load 120 100 A 130 A 0.5 0.5 % % 110 Output shorted to ground, no damage Continuous Hiccup current limiting Non-latching Vin = 36-60, Vout = nom., full load Iout = min. to max., Vin = nom. 20 MHz BW, Cout=700F, 50% ceramic, 50% OSCON or POSCAP. At all outputs 100 0 150 mV pk-pk 0.02 10,000 % of Vnom./C F MECHANICAL 2.3 x 1.45 x 0.57 58.4 x 36.83 x 14.47 3.14 80 0.06 & 0.04 1.524 & 1.016 Copper alloy 98.4-299 4.7-19.6 Outline Dimensions (with baseplate) Weight (with baseplate) Through Hole Pin Diameter Through Hole Pin Material Nickel subplate Gold overplate TH Pin Plating Metal and Thickness Inches mm Ounces Grams Inches mm -inches -inches ENVIRONMENTAL Operating Ambient Temperature Range Operating Baseplate Temperature Storage Temperature Thermal Protection/Shutdown (with "B" Suffix) Electromagnetic Interference Conducted, EN55022/CISPR22 RoHS rating with derating no derating required Vin = Zero (no power) -40 -40 -55 85 120 125 C C C Case temperature, measured in the center 130 C External filter required; see emissions performance test. B Class Notes Unless otherwise noted, all specifications apply over the input voltage range, full temperature range, nominal output voltage and full output load. General conditions are near sea level altitude, heat sink installed and natural convection airflow unless otherwise specified. All models are tested and specified with external parallel 1 F and 10 F multi-layer ceramic output capacitors. No external input capacitor is used (see Application Notes). All capacitors are low-ESR types wired close to the converter. These capacitors are necessary for our test equipment and may not be needed in the user's application. RoHS-6 Measured at input pin with maximum specified Cin and <500H inductance between voltage source and Cin All models are stable and regulate to specification under no load. The Remote On/Off Control is referred to -Vin. Inrush Current is defined as the peak current drawn by the Unit when Unit is enabled after Vin is present. Iin is defined as the steady-state operating current when Unit is operating at Vin Max 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 @ +25C Power Loss vs. Line Voltage and Load Current @ +25C 45 96.00 40 Power Dissipation (W) 98.00 Efficiency (%) 94.00 92.00 90.00 88.00 35 30 25 20 15 Vin=36V 86.00 Vin = 36V 10 Vin=48V 84.00 Vin = 48V 5 Vin=60V Vin = 60V 0 82.00 10 20 30 40 50 60 70 80 90 10 100 20 30 40 Load Current (Amps) 105 105 95 95 85 85 Output Current (Amps) Output Current (Amps) Dual Output Pins Maximum Current Temperature Derating at sea level (Vin = 48V, airflow from Vin to Vout, with heatsink)* 75 65 55 100LFM 45 200LFM 300LFM 35 70 80 90 100 75 65 55 100LFM 45 200LFM 300LFM 35 400LFM 400LFM 500LFM 25 500LFM 15 600LFM 15 600LFM 5 5 40 45 50 55 60 65 70 75 80 40 85 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) Ambient Temperature (C) Dual Output Pins Maximum Output Power Temperature Derating at sea level (Vin = 48V, airflow from Vin to Vout, with heatsink)* Single Output Pins Maximum Output Power Temperature Derating at sea level (Vin = 48V, airflow from Vin to Vout, with heatsink)* 850 800 800 750 750 700 700 Output Power (W) Output Power (W) 60 Single Output Pins Maximum Current Temperature Derating at sea level (Vin = 48V, airflow from Vin to Vout, with heatsink)* 25 850 50 Load Current (Amps) 650 600 550 100LFM 500 400 350 300 250 600 550 100LFM 500 200LFM 450 650 300LFM 450 400LFM 400 500LFM 350 600LFM 300 200LFM 300LFM 400LFM 500LFM 600LFM 250 200 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) 200 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) 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 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter PERFORMANCE DATA Enable Startup Delay (Vin = 48V, Iout = 100A, Cout = 0F, Ta = +25C) Top Trace = Vout, Bottom Trace = Enable, 5mS/div Startup Delay (Vin = 48V, Iout = 100A, Cout = 0F, Ta = +25C) Top Trace = Vout, Bottom Trace = Vin, 10mS/div Stepload Transient Response (Vin = 48V, Iout = 50-75-50% of Iout, Cload = 3200F, Ta = +25C, 2mS/div) Stepload Transient Response (Vin = 48V, Iout = 25-75-25% of Iout, Cload = 3200F, Ta = +25C, 2mS/div) Output Ripple & Noise @20MHz (Vin = 48V, Iout = 0A, Cout = 700F, Ta = +25C, 2S/div) Output Ripple & Noise @20MHz (Vin = 48V, Iout = 100A, Cout = 700F, Ta = +25C, 2S/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@ +25C 120 Output Current, each brick (Amps) 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 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 Min 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 Standard (Blank) Option PIN FUNCTION PIN FUNCTION 1 Vin(+) 5 Vout(-) 2 Enable 3 Vin(-) 7 Vout(+) 4 Vout(-) 8 Vout(+) INPUT/OUTPUT CONNECTIONS A Option PIN FUNCTION PIN FUNCTION 1 Vin(+) 5 Vout(-) 2 Enable 3 Vin(-) 7 Vout(+) 4 NA 8 NA INPUT/OUTPUT CONNECTIONS Z Option PIN FUNCTION PIN FUNCTION 1 Vin(+) 5 Vout(-) 2 Enable 3 Vin(-) 7 Vout(+) 4 Vout(+) 8 Vout(-) www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02 Page 8 of 16 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter MECHANICAL SPECIFICATIONS (THROUGH-HOLE MOUNT) Recommended Footprint Single Output Pins Recommended Footprint 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 (ALL .040" PINS) OUTPUT END OF CONVERTERS (.062" PINS WITH OR WITHOUT ADDITIONAL .040" PINS) INPUT PINS 1/4" HOLE IN ONE CORNER OF FOAM TRAY ADDED TO VISUALLY CONTROL CONVERTER ORIENTATIONS S OUTPUT PIN 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. 30 x 9.92.04 .38 .38 .25 x .57 MIN DEEP A .39 3x .25 X 45 2.00 2.40 .20 9.92.04 6.050 3.025 1.31 1.825 REF .73 A .74 1.45 4 EQ SPACES @ 1.825 EACH = 7.30 15x R.25 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 DRQ-8/100-L48NBxxxx-C Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter TECHNICAL NOTES Load Sharing Load sharing occurs when two or more DRQ-8/100-L48NB-Cs are connected in parallel at both the input and output terminals to supply greater output current than one unit alone or to offer system redundancy for moderate loads. If one converter fails, the other converter(s) will carry the load until the system is repaired. The DRQ-8/100-L48NB-C's design allows load sharing using the "droop" 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 current. Since the DRQ-8/100-L48NB-C's synchronous rectifier design will not accept appreciable reverse output current, starting at zero load, the DRQ8/100-L48NB-C with the higher output voltage will carry more of the full load until the voltage at the output drops to that of the lower DRQ-8/100-L48NB-C's. Load Sharing Guidelines If you wish to operate two or more DRQ-8/100-L48NB-C's in load sharing, use these guidelines: [1] Operate both converters connected in parallel to the same 48V input power source. This simplifies the design and makes more balanced power sharing. Using two different 48V input supplies must be carefully analyzed to avoid overloading one of the converters and is not recommended. VIN RBQ 1 DRQ1 VIN DRQ2 RBQ 2 VOUT RLOAD [4] If you add the optional input filters, use identical components with the same layout. [5] Operate both converters in the same temperature and airflow environment. Under load sharing, small differences in cooling can amplify into load imbalances. [6] Avoid operation near the low input voltage limit of the converter. Another subtle factor here is the external source impedance of the input supply. A source with higher source impedance at full load may make the net input voltage seen by the converter close to its minimum input voltage. Be sure to account for the decrease in effective input voltage under load. 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 batteries increase their internal cell impedance even if their no-load output voltage appears acceptable. Remember that what counts here is the voltage seen at the DRQ-8/100-L48NB-C input connections with full current. [7] As with any system design, thoroughly test the DRQ-8/100-L48NB-C's 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 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 the fuse will blow with an overload. VOUT +Vout +48V POWER SOURCE But if you attempt to measure the current in one of the converters using a series shunt, remember that the current meter itself may introduce enough finite resistance to affect the readings. (Hint: Use a non-contacting "clamp-on" Hall effect DC current meter with zero IR loss.) ILOAD OPTIONAL INPUT FILTERS Figure 2. Load Sharing Block Diagram Make sure the single 48V input source can supply the total current needed by all the parallel-connected DRQ-8/100-L48NB-C's. (Actually, it is possible to rate the full system at more than the current capacity of a single DRQ8/100-L48NB-C. However, you now lose the redundancy protection feature.) [2] Use conservative loading. Do not assume for example that two parallel DRQ-8/100-L48NB-C's can always supply "times two" amounts of output current. Allow for limits in input voltage and other factors. If one DRQ-8/100-L48NB-C overloads while in load share, it will protect itself by entering the overcurrent mode. If the whole system is running close to maximum output current, the remaining good DRQ-8/100-L48NB-C will soon also enter overcurrent mode. These two events probably will not happen 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. Start Up Considerations 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 times. 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 supplies the surge current and a smaller parallel low-ESR ceramic cap gives low AC impedance. Remember that the input current is carried both by the wiring and the ground plane return. Make sure the ground plane uses adequate thickness copper. Run additional bus wire if necessary. On/Off Control The input-side, remote On/Off Control function (pin 2) can be ordered to operate with either logic type: Negative ("N" suffix): Negative-logic devices are off when pin 2 is left open (or pulled high, applying +2.4V to 20V), and on when pin 2 is pulled low (-0.1V to 0.8V) with respect to -Input as shown in Figure 3. [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 pulled high, applying +2.4V to +20V), and off when pin 2 is pulled low (-0.1V to 0.8V) with respect to -Input as shown in Figure 3. Dynamic control of the remote on/off function is best accomplished with a mechanical relay or an open-collector/open-drain drive circuit (optically isolated if appropriate). The drive circuit should be able to sink appropriate current (see Performance Specifications) when activated and withstand appropriate voltage when deactivated. Applying an external voltage to pin 2 when no input power is applied to the converter can cause permanent damage to the converter. Input Fusing Certain applications and/or safety agencies may require fuses at the inputs of power conversion components. Fuses should also be used when there is the +VIN +VCC ON/OFF CONTROL Figure 3. Driving the Negative Logic On/Off Control Pin possibility of sustained input voltage reversal which is not current-limited. For greatest safety, we recommend a fast blow fuse installed in the ungrounded input supply line. Input Under-Voltage Shutdown and Start-Up Threshold Under normal start-up conditions, converters will not begin to regulate properly until the rising input voltage exceeds and remains at the Start-Up Threshold Voltage (see Specifications). Once operating, converters will not turn off until the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent restart will not occur until the input voltage rises again above the Start-Up +VO RLOAD -VIN -VIN Figure 4. Input Fusing These converters include a soft start circuit to moderate the duty cycle of its PWM controller at power up, thereby limiting the input inrush current. 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 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. -VO For best performance, we recommend installing a low-ESR capacitor 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 voltage at all times. More input bulk capacitance may be added in parallel (either electrolytic or tantalum) if needed. Recommended Output Filtering The converter will achieve its rated output ripple and noise with no additional external capacitor. However, the user may install more external output capacitance to reduce the ripple even further or for improved dynamic response. Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors. Mount these close to the converter. Measure the output ripple under your load conditions. Use only as much capacitance as required to achieve your ripple and noise objectives. Excessive capacitance can make step load recovery sluggish or possibly introduce instability. Do not exceed the maximum rated output capacitance listed in the specifications. Fuse +VIN Start-Up Time Assuming that the output current is set at the rated maximum, the Vin to Vout Start-Up Time (see Specifications) is the time interval between the point when the rising input voltage crosses the Start-Up Threshold and the fully loaded output voltage enters and remains within its specified accuracy band. Actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter. 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, including long distributed wiring to a remote power supply. The converter will operate with no additional external capacitance if these conditions are met. -VIN +VIN Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage. 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 components, circuits and layout as shown in the figures below. The Cbus and Lbus 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 All models regulate within specification and are stable under no load to full load conditions. Operation under no load might however slightly increase output ripple and noise. Thermal Shutdown To prevent many over temperature problems and damage, these converters include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC/DC's to rise above the Operating Temperature Range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. When the temperature decreases below the turn-on threshold, the converter will automatically restart. There is a small amount of hysteresis to prevent rapid on/off cycling. CAUTION: If you operate too close to the thermal limits, the converter may shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown. Temperature Derating Curves The graphs in this data sheet illustrate typical operation under a variety of conditions. The Derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced airflow measured in Linear Feet per Minute ("LFM"). Note that these are AVERAGE measurements. The converter will accept brief increases in current or reduced airflow as long as the average is not exceeded. Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Murata Power Solutions makes Characterization measurements in a closed cycle wind tunnel with calibrated airflow. We use both thermocouples and an infrared camera system to observe thermal performance. As a practical matter, 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 OSCILLOSCOPE VIN + - + - CURRENT PROBE +VIN LBUS you thoroughly understand the enclosure geometry, entry/exit orifice areas and the fan flowrate specifications. CAUTION: If you exceed these Derating guidelines, the converter may have 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. Output Fusing The converter is extensively protected against current, voltage and temperature extremes. However your output application circuit may need additional protection. In the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. Consider using an appropriate fuse in series with the output. Output Current Limiting Current limiting inception is defined as the point at which full power falls below the rated tolerance. See the Performance/Functional Specifications. Note particularly that the output current may briefly rise above its rated value in normal 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 too high, the converter will enter the short circuit condition. Output Short Circuit Condition When a converter is in current-limit mode, the output voltage will drop as the output current demand increases. If the output voltage drops too low (approximately 97% of nominal output voltage for most models), the PWM controller will shut down. Following a time-out period, the PWM will restart, causing 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 is called "hiccup mode." The hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures and/or component damage. +VOUT CIN C1 -VIN C2 SCOPE RLOAD -VOUT CIN = 300F, ESR < 700m @ 100kHz LBUS = <500H Figure 5. Measuring Input Ripple Current C1 = 1F C2 = 10F 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 because you do not have to power down the converter to make it restart. The system will automatically restore operation as soon as the short circuit condition is removed. Output Capacitive Load We strive to have all technical data in this customer data sheet highly accurate and complete. This customer data sheet is revision-controlled and dated. The latest customer data sheet revision is normally on our website (www .murata-ps.com) for products which are fully released to Manufacturing. Please be especially careful using any data sheets labeled "Preliminary" since data 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 advertisements, 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 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. [3] Conducted Emissions Test Results 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 C1 C2 C3 L1 L2 C4 C5 + C6 C7 + C12 DC/DC -48V C8 C9 C10 LOAD GND 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 C1, C2, C3, C4, C5 C6 L1, L2 C8, C9, C10, C11 C7 C12 Part Number Description Vendor SMD CERAMIC-100VGRM32ER72A105KA01L Murata 1000nF-X7R-1210 SMD CERAMIC100V-100nFGRM319R72A104KA01D Murata 10%-X7R-1206 COMMON MODE-473uHPG0060T Pulse 25%-14A SMD CERAMIC630V-0.22uFGRM55DR72J224KW01L Murata 10%-X7R-2220 Aluminum100V-220UfUHE2A221MHD Nichicon 10%-long lead NA [2] Conducted Emissions Test Equipment Used Hewlett Packard HP8594L Spectrum Analyzer - S/N 3827A00153 2Line V-networks LS1-15V 50/50Uh Line Impedance Stabilization Network Graph 2. Conducted emissions performance, Negative Line, CISPR 22, Class B, full load [4] Layout Recommendations Most applications can use the filtering which is already installed inside the 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 IR Transparent optical window Variable speed fan Unit under test (UUT) 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. The system includes a precision low flow-rate anemometer, variable speed fan, power supply input and load controls, temperature gauges, and adjustable heating element. The IR camera monitors the thermal performance of the Unit Under Test (UUT) under static steady-state conditions. A special optical port is used which is transparent to infrared wavelengths. IR Video Camera Heating element Precision low-rate anemometer 3" below UUT 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 transverse airflow studies are possible by rotation of this carrier board since there are often significant differences in the heat dissipation in the two airflow directions. The combination of adjustable airflow, adjustable ambient heat, and adjustable Input/Output currents and voltages mean that a very wide range of measurement conditions can be studied. The collimator reduces the amount of turbulence adjacent to the UUT by minimizing airflow turbulence. Such turbulence influences the effective heat transfer characteristics and gives false readings. Excess turbulence removes more heat from some surfaces and less heat from others, possibly causing uneven overheating. Ambient temperature sensor Airflow 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 specifications 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 Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ 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. (c) 2017 Murata Power Solutions, Inc. www.murata-ps.com/support SDC_DRQ-8/100-L48NBxxxx-C.B02 Page 16 of 16