RBC-12/17-D48 Series www.murata-ps.com Quarter Brick, Regulated Bus Converters Output (V) Current (A) Nominal Input (V) 12 17 48 Optimized for distributed power Regulated Intermediate Bus Architectures (RIBA), the RBC DC/DC bus converter series offer regulated outputs (±1.5%) in an industry-standard quarter brick open frame package. Typical unit FEATURES PRODUCT OVERVIEW Up to 210 Watts total output power The present trend in distributed power architectures (DPA) requires both high efficiency and some regulation of the output voltage to reduce the risk of under voltage dropout. Earlier unregulated bus converters were simply ratiometric “DC transformers.” The fully isolated (2250Vdc) RBC series accept a wide range 36 to 75 Volt DC input (48V nominal) and convert it to an output of 12Vdc. This output then drives point-of-load (PoL) converters such as our Okami, LSN, LEN, LSM or LQN series which feature precise load regulation. Applications include 48V-powered datacom and telecom installations, base stations, cellular telephone repeaters and embedded systems. Low overall height of 0.42" (10.7 mm) fits tight card cages. Up to 93% ultra-high efficiency @ full load 48V Input ( up to 36-75V range) 12V/17A Output for Regulated Intermediate Bus Architectures (RIBA) with POL converters Synchronous-rectifier topology 225kHz fixed switching frequency Fully isolated, 2250Vdc (BASIC) 2.3" x 1.45" x 0.42" quarter brick Stable no-load condition Thermal shutdown Fully I/O protected The RBC’s synchronous-rectifier topology and fixed frequency operation means excellent efficiencies. “No fan” or zero airflow applications may use the optional base plate for cold surface mounting or natural-convection heatsinks. A wealth of electronic protection features include input undervoltage (UV) lockout, output current limit, short circuit hiccup, overtemperature shutdown and output overvoltage. Available options include positive or negative logic remote On/Off control and the baseplate. Assembled using ISO-certified automated surface-mount techniques, the RBC series includes all UL and IEC emissions, safety and flammability certifications. Certified to UL/IEC/EN 60950-1 and CSA C22.2 No.60950-1-07, 2nd edition +VIN (1) +VOUT (8) –VIN (3) GATE DRIVE –VOUT (4) SWITCHING CONTROLLER VOLTAGE SENSE REMOTE ON/OFF (2) HICCUP CURRENT SENSE OV, UV, OT SHUTDOWN Typical topology is shown. Figure 1. Simplified Block Diagram For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 1 of 10 RBC-12/17-D48 Series Quarter Brick, Regulated Bus Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE Root Model ➀ RBC-12/17-D48N-C V IOUT (Max.) A Typ. Max. 12 17 50 75 VOUT Regulation (Max.) Line Load R/N (mV pk-pk) ±0.65% ±1.5% VIN (Nom.) V 48 V Iin, no load mA Iin, full load A Min. Typ. Case Pinout 36-75 165 4.59 90.5% 92.5% C49 P65 Range Efficiency Package ➀ Please refer to the part number structure for complete model numbers PART NUMBER STRUCTURE R BC - 12 / 17 - D48 N B - C RoHS-6 hazardous substance compliant (does not claim EU RoHS exemption 7b–lead in solder) Regulated Bus Converter Nominal Output Voltage: 12 Volts Optional Baseplate, special order Note: Some model number combinations may not be available. Contact Murata Power Solutions for ordering assistance. Maximum Rated Output: Current in Amps Input Voltage Range: D48 = 36 to 75 Volts (48V nominal) 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. Optional: On/Off Control N = negative logic , standard P = positive logic, optional allow the instantaneous input voltage to go below the minimum voltage at all times. Even if this voltage depression is very brief, this may interfere with the on-board controller and possibly cause a failed start. Start-Up Considerations Use a moderate size capacitor very close to the input terminals. You may need two parallel capacitors. A larger electrolytic or tantalum cap supplies the surge current and a smaller parallel low-ESR ceramic cap gives low AC impedance. 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 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. www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 2 of 10 RBC-12/17-D48 Series Quarter Brick, Regulated Bus Converters Performance/Functional Specifications Typical at TA = +25°C under nominal input voltage and full-load conditions unless noted. Refer to required airflow and Derating curves for thermal specifications. [1] Input Electronic Thermal Shutdown +125°C min. Operating Temperature Range (With Derating) -40ºC to +85ºC, See Derating curves Input Voltage Range 36-75 Volts Storage Temperature Range –55 to +125°C Recommended External Fuse 20 Amp fast blow Flammability UL94V-0 Start-up Threshold 35V Relative Humidity To 85% / +85°C 33.5V Safety Compliance UL60950-1, CSA-C22.2 No.60950-1, IEC/EN60950-1 Electromagnetic Interference conducted or radiated EN55022/CISPR22 (may require external filters) Undervoltage shutdown Overvoltage shutdown None [note 12] Input Current, nominal See ording guide Input Current, VIN = VMIN 6.00A Input Current, shut-down mode 6.5mA max. Physical 2 0.05A -seconds Inrush Transient Reflected Ripple Current [2] 15mAp-p Internal Filter Type L-C Reverse Polarity Protection None (see note 11), install external fuse Remote On/Off Control [5] Positive Logic Current Output Total Output Power [3] 210W max. [15] Setpoint Accuracy (50% load) ±3% of VNOMINAL Extreme Accuracy [14] 11.4V min. to 12.6V max. Output Current [7] See ordering guide Minimum Load No minimum load Ripple and Noise (20MHz bandwidth) See ordering guide Line and Load Regulation [10] See ordering guide Efficiency See ordering guide Isolation Voltage (Input/output) (Input to baseplate) (Baseplate to output) 2250Vdc min. 1500Vdc min. 1500Vdc min. Isolation Resistance 100M: Isolation Capacitance 1500pF Isolation Safety Rating Basic Current Limit Inception (98% of VOUT) 27A, after warm up Short Circuit Current [6] 5 Amps (hiccup autorestart – remove short for recovery) Copper alloy with gold plate over nickel underplate Weight 1 ounce (28.4 grams) Absolute Maximum Ratings On = Open or +3.5 to +13.5 V. Off = Gnd. Pin or 0 to +1V. On = Gnd. Pin or 0 to +1V. Off = Pin open or +3.5V to +13.5V. 2mA max. Negative Logic Pin Material Input Voltage: Continuous Transient (100msec max.) 75 Volts 100 Volts Input Reverse-Polarity Protection None, see notes. Install external fuse. Output Current Current limited. Devices can withstand an indefinite output short circuit without damage. Storage Temperature –55 to +125°C Lead Temperature (soldering, 10 sec.) +280°C These are stress ratings. Exposure of devices to 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. (1) All models are tested and specified with external 1 || 10uF ceramic/tantalum output capacitors and external 22uF input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test equipment and may not be required to achieve specified performance in your applications. All models are stable and regulate within spec under no-load conditions. (2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is CIN = 33μF/100V tantalum, CBUS = 220μF/100V electrolytic, LBUS = 12μH. (3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves are presented at sea level altitude. Be aware of reduced power dissipation with increasing density altitude. (4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed conditions, TPCBOARD = +25°C, full output load, natural air convection. (5) The On/Off Control may be driven with external logic or by applying appropriate external voltages which are referenced to Input Common. The On/Off Control Input should use either an open collector/open drain transistor or logic gate which does not exceed +13.5V. General conditions for Specifications are +25°C, VIN = nominal, VOUT = nominal, full load. Short Circuit Duration (+VOUT grounded) Continuous, no damage (6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. Overvoltage Protection 15Vdc max. via magnetic feedback (7) The outputs are not intended to sink appreciable reverse current. Max. Capacitive Loading (resistive load) 10,000μF, low ESR 0.02 Ohms (8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduction. Temperature Coefficient ±0.02% per °C (9) All models are fully operational and meet published specifications, including “cold start” at –40°C. Dynamic Characteristics (10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. Dynamic Load Response (to within 3% of VOUT) 75μsec, 50-75-50% load step 100μsec, 25-75-25% load step Start Up Time (VIN to VOUT regulated) (Remote On to Vout regulated) (11) If reverse polarity is accidentally applied to the input, a body diode will become forward biased and will accept considerable current. To ensure reverse input protection with full output load, always connect an external input fuse in series with the +VIN input. Use approximately twice the full input current rating with nominal input voltage. 60msec 60msec (12) Input overvoltage shutdown on 48V input models is normally deleted in order to comply with certain telecom reliability requirements. These requirements attempt continued operation despite significant input overvoltage. Fixed Switching Frequency 225 ±25kHz (13) Note that the converter may operate up to +110°C PCB temperature with the baseplate installed. However, thermal self-protection occurs near +125°C and there is a temperature gradient from high power components. Therefore, +100°C baseplate temperature is recommended to avoid thermal shutdown. Environmental Calculated MTBF [4] 1,247,727 hours (14) “Extreme accuracy” refers to all combinations of line and load regulation, output current, initial setpoint accuracy and temperature coefficient. Operating Case Temperature [13] +110°C max. (15) Vo = (11.64V to 12.36V) Power = (197.88W to 210.12W) www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 3 of 10 RBC-12/17-D48 Series Quarter Brick, Regulated Bus Converters MECHANICAL SPECIFICATIONS 58.4 2.30 47.24 1.860 M3 x 0.5-6H THREAD X 0.15 DP TYP (4 PLS) TOP VIEW 36.8 1.45 END VIEW ALUMINUM BASEPLATE 'B' OPTION 26.16 1.030 10.7 0.42 WITHOUT BASEPLATE 12.7 0.50 WITH BASEPLATE SIDE VIEW 3.5 0.14 REF SEATING PLANE 4.8 0.19 PIN LENGTH ABOVE SEATING PLANE (SEE NOTE 1 ON SHEET 2) 0.060 0.002 [1.52 0.05] 2X AT PINS 4-5 3 4 36.8 1.45 REF 2 15.24 0.600 1 7.62 0.300 8 BOTTOM VIEW 2.000 DIMENSIONS ARE IN INCHES [mm] TOLERANCES: 2 PLACE 0.02 3 PLACE 0.010 0.010 MIN FROM SEATING PLANE TO HIGHEST COMPONENT 0.040 0.002 [1.02 0.05] 3X AT PINS 1-3 INPUT/OUTPUT CONNECTIONS Pin Function 1 +Input 2 Remote On/Off* 3 -Input 4 -Output 8 +Output * The Remote On/Off can be provided with either positive (P suffix) or negative (N suffix) logic. ANGLES: 1 COMPONENTS SHOWN ARE FOR REFERENCE ONLY MATERIAL: 0.040 PINS: COPPER ALLOY 0.060 PINS: COPPER ALLOY FINISH: (ALL PINS) GOLD (5u"MIN) OVER NICKEL (50u" MIN) 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. www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 4 of 10 RBC-12/17-D48 Series Quarter Brick, Regulated Bus Converters RECOMMENDED FOOTPRINT (VIEW THROUGH CONVERTER) REF: DOSA STANDARD SPECIFICATION FOR QUARTER BRICK DC/DC CONVERTERS FINISHED HOLE SIZES @ PINS 1-3 TOP VIEW (PER IPC-D-275, LEVEL C) 0.048-0.062 CL (PRI) (SEC) 8 1 37.3 1.47 CL 2 4 3 7.6 0.300 7.6 0.300 CL FINISHED HOLE SIZES @ PINS 4 & 8 0.100MIN @ 1-4, 8 FOR PIN SHOULDERS (PER IPC-D-275, LEVEL C) 25.4 1.00 0.070-0.084 50.8 2.000 58.9 2.32 IT IS RECOMMENDED THAT NO PARTS BE PLACED BENEATH CONVERTER (HATCHED AREA) 1. ALTERNATE PIN LENGTHS AVAILABLE (CONTACT MURATA-PS FOR INFORMATION) 2. COMPONENTS SHOWN FOR REF ONLY 3. DIMENSIONS ARE IN INCHES WITH NEAREST METRIC EQUIVALENT SHOWN AS [mm] 4. PIN LOCATION DIMENSIONS APPLY AT CIRCUIT BOARD LEVEL 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. www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 5 of 10 RBC-12/17-D48 Series Quarter Brick, Regulated Bus Converters SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT 9.92 REF 9.92 REF EACH STATIC DISSIPATIVE POLYETHYLENE FOAM TRAY ACCOMMODATES 15 CONVERTERS IN A 3 X 5 ARRAY 0.88 REF 2.75±0.25 CLOSED HEIGHT CARTON ACCOMMODATES TWO (2) TRAYS YIELDING 30 CONVERTERS PER CARTON MPQ=30 11.00±.25 10.50±.25 SHIPPING TRAY DIMENSIONS RBC 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. 252.0 +.000 [9.92] -.062 46.36 [1.825] TYP 252.0 +.000 [9.92] -.062 15.875 [0.625] TYP 60.96 [2.400] TYP 18.67 [0.735] 36.83 [1.450] TYP CL 18.42 [0.725] TYP 6.35 [.25] R TYP 6.35 [.25] CHAMFER TYP (4-PL) Notes: 1. Material: Dow 220 antistat ethafoam (Density: 34-35 kg/m3) 2. Dimensions: 252 x 252 x 19.1 mm 5 x 3 array (15 per tray) 3. All dimensions in millimeters [inches] 4. Tolerances unless otherwise specified: +1/-0 www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 6 of 10 RBC-12/17-D48 Series Quarter Brick, Regulated Bus Converters PERFORMANCE DATA Efficiency vs. Line Voltage and Load Current @ Ta = +25°C Power Dissipation vs. Load Current @ Ta = +25°C 95 20 93 17.5 VIN = 75V Power Dissipation (W) VIN = 60V 91 Efficiency (%) VIN = 75V 89 VIN = 60V VIN = 48V 87 VIN = 48V 15 VIN = 36V 12.5 10 VIN = 36V 7.5 85 5 83 3 5 7 9 11 13 15 2.5 17 5 7.5 10 12.5 15 17.5 Load Current (A) Load Current (A) Maximum Power Temperature Derating at Sea Level Vin = 48 (air flow from Pin 1 to Pin 3 on PCB, no baseplate) Maximum Power Temperature Derating at Sea Level Vin = 48 (air flow from Pin 1 to Pin 3 on PCB, with baseplate) 18 18 17 17 16 16 15 15 Load Current (A) Load Current (A) 14 13 12 65 100 200 300 400 11 10 9 8 LFM LFM LFM LFM LFM 14 13 65 100 200 300 400 12 11 LFM LFM LFM LFM LFM 10 7 6 9 30 35 40 45 50 55 60 65 Ambient Te mperature (°C) 70 75 80 85 30 35 40 45 50 55 60 65 Ambient Te mperature (°C) 70 75 80 85 www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 7 of 10 RBC-12/17-D48 Series Quarter Brick, Regulated Bus Converters OSCILLOGRAMS Stepload Transient Response (Vin=48V, Iout=50-75-50% of Imax, Cout=1 & 10uF, Ta=+25°C, Scope BW=20MHz) Stepload Transient Response (Vin=48V, Iout=25-75-25% of Imax, Cout=1 & 10uF, Ta=+25°C, Scope BW=20MHz) Output Ripple and Noice (Vin=48V, Iout=17A, Cout=1 & 10uF, Ta=+25°C, Scope BW=20MHz) www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 8 of 10 RBC-12/17-D48 Series Quarter Brick, Regulated Bus Converters Technical Notes I/O Filtering and Noise Reduction The RBC is tested and specified with external output capacitors. These capacitors are necessary to accommodate our test equipment and may not be required to achieve desired performance in your application. The RBC is designed with high-quality, high-performance internal I/O caps, and will operate within spec in most applications with no additional external components. In particular, the RBC input capacitors are specified for low ESR and are fully rated to handle the units' input ripple currents. Similarly, the internal output capacitors are specified for low ESR and full-range frequency response. In critical applications, input/output ripple/noise may be further reduced using filtering techniques, the simplest being the installation of external I/O caps. External input capacitors serve primarily as energy-storage devices. They minimize high-frequency variations in input voltage (usually caused by IR drops in conductors leading to the DC/DC) as the switching converter draws pulses of current. Input capacitors should be selected for bulk capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The switching nature of modern DC/DC's requires that the dc input voltage source have low ac impedance at the frequencies of interest. Highly inductive source impedances can greatly affect system stability. Your specific system configuration may necessitate additional considerations. Input Fusing Most applications and or safety agencies require the installation of fuses at the inputs of power conversion components. The RBC Series may have an optional input fuse. Therefore, if input fusing is mandatory, either a normalblow or a fast-blow fuse with a value no greater than twice the maximum input current should be installed within the ungrounded input path to the converter. Input Overvoltage and Reverse-Polarity Protection The RBC does not incorporate input reverse-polarity protection. Input voltages in excess of the specified absolute maximum ratings and input polarity reversals of longer than "instantaneous" duration can cause permanent damage to these devices. Start-Up Time The VIN to VOUT Start-Up Time is the interval between the time at which a rising input voltage crosses the lower limit of the specified input voltage range TO OSCILLOSCOPE CURRENT PROBE VIN LBUS CBUS The On/Off to VOUT Start-Up Time assumes the converter is turned off via the On/Off Control with the nominal input voltage already applied to the converter. The specification defines the interval between the time at which the converter is turned on and the fully loaded output voltage enters and remains within its specified regulation band. Thermal Considerations and Thermal Protection The typical output-current thermal-derating curves shown below enable designers to determine how much current they can reliably derive from each model of the RBC under known ambient-temperature and air-flow conditions. Similarly, the curves indicate how much air flow is required to reliably deliver a specific output current at known temperatures. The highest temperatures in RBC's occur at their output inductor, whose heat is generated primarily by I 2 R losses. The derating curves were developed using thermocouples to monitor the inductor temperature and varying the load to keep that temperature below +110°C under the assorted conditions of air flow and air temperature. Once the temperature exceeds +125°C (approx.), the thermal protection will disable the converter using the hiccup shutdown mode. Undervoltage Shutdown When the input voltage falls below the undervoltage threshold, the converter will terminate its output. However, this is not a latching shutdown mode. As soon as the input voltage rises above the Start-Up Threshold, the converter will restore normal operation. This small amount of hysteresis prevents most uncommanded power cycling. Since some input sources with higher output impedance will increase their output voltage greater than this hysteresis as soon as the load is removed, it is possible for this undervoltage shutdown to cycle indefinitely. To prevent this, be sure that the input supply always has adequate voltage at full load. Thermal Shutdown Extended operation at excessive temperature will initiate overtemperature shutdown triggered by a temperature sensor inside the PWM controller. This operates similarly to overcurrent and short circuit mode. The inception point of the overtemperature condition depends on the average power delivered, the ambient temperature and the extent of forced cooling airflow. Remote On/Off Control +INPUT + and the fully loaded output voltage enters and remains within its specified regulation band. Actual measured times will vary with input source impedance, external input capacitance, and the slew rate and final value of the input voltage as it appears to the converter. CIN The RBC may be turned off or on using the external remote on/off control. This terminal consists of a digital input to the internal PWM controller through a protective resistor and diode. – COMMON CIN = 33μF, ESR < 700m7 @ 100kHz CBUS = 220μF, ESR < 100m7 @ 100kHz LBUS = 12μH The on/off input circuit should be CMOS logic referred to the –Input power terminal however TTL or TTL-LS logic will also work or a switch to ground. If preferred, you can even run this using a bipolar transistor in “open collector” configuration or an “open drain” FET transistor. You may also leave this input unconnected and the converter will run whenever input power is applied. Figure 2. Measuring Input Ripple Current www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 9 of 10 RBC-12/17-D48 Series Quarter Brick, Regulated Bus Converters Vertical Wind Tunnel IR Transparent optical window Unit under test (UUT) Variable speed fan IR Video Camera 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. Heating element Precision low-rate anemometer 3” below UUT Ambient temperature sensor Both through-hole and surface mount converters are soldered down to a 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. Airflow collimator Figure 3. Vertical Wind Tunnel Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 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. 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. © 2012 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_RBC-12/17-D48.B02 Page 10 of 10