UNR Series www.murata-ps.com Single Output, Non-Isolated, 3.3V 8-40 Watt, DC/DC Converters OBSOLETE PRODUCT Last time buy: 3 March 2014 Click here for more information. Features ■ Low cost ■ 5V or 12V inputs ■ 3.3V±1% (±33mV) outputs ■ ±0.25% (±8mV) max. line regulation ■ ±0.5% (±17mV) max. load regulation ■ Guaranteed efficiencies to 86% ■ Power densities to 29W/in3 ■ High output current ... small packages: 3A (1" x 1" package) 8A (2" x 1" package) 12A (2" x 2" package) ■ No heat sinks required ■ –40 to +100oC operating temperatures ■ On/off/sync control ■ UL, CSA, IEC safety approvals ■ Customized VOUT (Contact DATEL) New low-voltage microprocessor and memory chips are driving the migration from centralized to distributed power processing in modern telecommunication and computer systems. Powering these new chips requires local, on-board power converters that rapidly source large amounts of current while maintaining accurate voltages with minimal ripple and noise. The distribution losses, unpredictable regulation and poor transient response of traditional centralized power systems are no longer acceptable. Power processing at the "point-of-use" is frequently the only way to achieve desired performance. DATEL’s new UNR Series of non-isolated, 3.3V output, 5V or 12V input, switching DC/DC converters were specifically designed for on-board usage in today’s mixedlogic 5V/3.3V systems. They also support those systems that are already drawing maximum current from their 5V buses and must resort to their 12V buses. These low-cost, extremely efficient (typically 90%) power converters are capable of delivering full rated output currents (2.5-12 Amps) while maintaining low case temperatures without the need for heat sinks or any auxiliary cooling. UNR Series devices combine proven circuit architectures, contemporary SMT-on-ceramic and SMT-on-pcb assembly techniques, and a new thermally-conductive potting compound to achieve high output power in the smallest packages possible. DATEL is currently developing UNR Series devices that incorporate active load sharing with output current/voltage-sensing capabilities. We can also quickly modify existing devices for application-specific output voltages from 1.8 to 5 Volts. Please contact us with your unique requirements ... we may already have the product you need. DATEL also makes a complete line of isolated 3.3V DC/DC converters that operate from wide-range input voltages from 4.6 to 72V. +VOUT +VIN OUTPUT RETURN INPUT RETURN LOGIC GROUND ON/OFF CONTROL For full details go to www.murata-ps.com/rohs PWM CONTROLLER REFERENCE & ERROR AMP Figure 1. Simplified Schematic www.murata-ps.com/support MDC_UNR8-40W.C01 Page 1 of 6 UNR Series Performance Specifications and Ordering Guide Single Output, Non-Isolated, 3.3V 8-40 Watt, DC/DC Converters ➀ Output VOUT (Volts) Model IOUT (mA, Max.) Ripple/Noise ➁ (mVp-p, Max.) Input Regulation (Max.) Load ➂ Line VIN Nom. (Volts) Range (Volts) IIN ➃ (mA, Max.) Efficiency (Min.) Package (Case, Pinout) UNR-3.3/3000-D5 3.3 3000 140 ±0.25% ±0.5% 5 4.75-5.5 25/2390 85% C7, P9 UNR-3.3/2500-D12 3.3 2500 100 ±0.2% ±0.5% 12 10.8-13.2 35/856 82% C7, P10 UNR-3.3/8000-D5 3.3 8000 75 ±0.25% ±0.5% 5 4.75-5.5 25/6330 86% C5, P9 UNR-3.3/12000-D5 3.3 12000 125 ±0.25% ±0.75% 5 4.75-5.5 50/9700 84% C6, P9 ➀ ➁ ➂ ➃ Typical at TA = +25°C under nominal line voltage and full load conditions unless otherwise noted. These devices require external input and output capacitors for normal operation. 20MHz bandwidth. Specified with external I/O capacitors. See Technical Notes. 10% to 100% load. Nominal line voltage, no load/full load conditions. Part Number Structure Case C5 U NR - 3.3 / 8000 - D5 Input Voltage Range: D5 = 4.75-5.5 Volts (5V nominal) D12 = 10.8-13.2 Volts (12V nominal) Output Configuration: U = Unipolar Non-Isolated Maximum Output Current in mA Nominal Output Voltage: 3.3 Volts Mechanical Specifications Case C7 Case C6 Pin 1 2 3 4 5 6 I/O Connections Function P9 Function P10 Logic Gnd. Do Not Connect On/Off Control No Connect +Output +Output Output Rtn. Output Rtn. Input Rtn. Input Rtn. +Input +Input www.murata-ps.com/support MDC_UNR8-40W.C01 Page 2 of 6 UNR Series Single Output, Non-Isolated, 3.3V 8-40 Watt, DC/DC Converters Performance/Functional Specifications Typical @ TA = +25°C under nominal line voltage and full load conditions unless noted. ➀ ➁ Input Absolute Maximum Ratings Input Voltage Range: "D5" Models "D12" Models 4.75-5.5 Volts (5V nominal) 10.8-13.2 Volts (12V nominal) Input Current See Ordering Guide Input Filter Type ➁ None Overvoltage Shutdown None Reverse-Polarity Protection Yes (Instantaneous, 10A maximum) On/Off (Sync.) Control (Pin 2) ➂ TTL high = off, low (or open) = on 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. Storage temperatures have been verified for 168 hours. Input Voltage: "D5" Models "D12" Models 7 Volts 15 Volts Input Reverse-Polarity Protection Current must be <10A. Brief duration. Fusing recommended. Output VOUT Accuracy (50% load) ±1% Output Overvoltage Protection None Temperature Coefficient ±0.02% per °C Output Current Ripple/Noise (20MHz BW) ➁ See Ordering Guide Current limited. Max. current and short-circuit duration model dependent. Line/Load Regulation See Ordering Guide Storage Temperature –55 to +105°C Efficiency See Ordering Guide Lead Temperature (soldering, 10sec.) +300°C Current Limiting Auto-recovery Dynamic Characteristics Transient Response (25% load step) 100µsec to ±1.5% of final value Switching Frequency: "D5" Models "D12" Models 75kHz (±5kHz) 90kHz (±5kHz) Temperature Derating 20 19 Environmental –40 to +50°C –40 to +45°C to +100°C (See Derating Curves) Storage Temperature –55 to +105°C UNR-3.3/12000-D5 UNR-3.3/8000-D5 UNR-3.3/3000-D5 UNR-3.3/2500-D12 16 15 Output Current (Amps) Physical Dimensions: 3A "D5" and 2.5A "D12" Models 8A "D5" Model 12A "D5" Model 18 17 Operating Temperature (ambient): Without Derating: 3A an 8A "D5" Models 12A "D5" and 2.5A "D12" Models With Derating 14 A B C D 13 12 11 A 10 9 8 B 7 6 1" x 1" x 0.45" (25 x 25 x 11.4mm) 2" x 1" x 0.45" (51 x 25 x 11.4mm) 2" x 2" x 0.45" (51 x 51 x 11.4mm) 5 Shielding 5-sided ➃ 1 Case Connection Pin 4 (Output Return) Case Material Corrosion resistant steel with epoxy-based enamel finish Pin Material Brass, solder coated Weight: 3A "D5" and 2.5A "D12" Models 8A "D5" Model 12A "D5" Model 1 ounce (28.4 grams) 1.5 ounces (42.5 grams) 2 ounces (56.7 grams) 4 3 C D 2 0 40 0 40 45 50 55 60 65 70 75 80 85 90 95 100 Ambient Temperature (°C) ➀ These power converters require a minimum 10% loading to maintain specified regulation. Operation under no-load conditions will not damage these devices, however, they may not meet all listed specifications. ➁ These power converters do not have internal input filters and do require external input and output capacitors to achieve rated specifications. Application-specific internal input/ output filtering can be added upon request. Contact DATEL for details. ➂ On/Off Control pins are included on "D5" models only. See Technical Notes for details. Applying a voltage to the Control pin when no input power is applied to the converter can cause permanent damage to the converter. ➃ Cases can be provided with 6-sided shielding. Contact DATEL for details. www.murata-ps.com/support MDC_UNR8-40W.C01 Page 3 of 6 UNR Series Single Output, Non-Isolated, 3.3V 8-40 Watt, DC/DC Converters Technical Notes Input Capacitors addresses all possible load conditions, we have chosen to leave the capacitor out so that you may select a cost-effective component appropriate to your particular application. As shown in the simplified schematic, UNR Series power converters do not have internal input capacitors. Users must install external input capacitors for the devices to achieve specified operation. The input capacitor functions as a true energy-storage element. Its required capacitance varies as a function of applied line voltage. Additionally, as the power converter’s input FET switch cycles on and off, the input capacitor must have the ability to rapidly supply pulses of relatively high current. Therefore, required rms-ripple-current capabilities of the input capacitor will vary as a function of the power converter’s load current. Rather than install a large, expensive, internal capacitor that Use the charts below to determine how much input capacitance is required as a function of input voltage and also to determine the required rms-ripplecurrent capabilities of the needed capacitor as a function of output load current. Note that "low-line" conditions will require proportionally more input capacitance in order to maintain the required energy levels and that higher output currents will obviously require higher input currents. Contact DATEL’s Applications Engineering Group if you have any questions. UNR-3.3/12000-D5 Minimum Input Capacitor Value vs. VIN @ Full Load CIN RMS Ripple Current vs. ILOAD 8 CIN RMS Ripple Current (Amps) Input Capacitance (μF) 10000 1000 100 4.75 7 6 5 4 3 2 1 0 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 5.30 5.35 5.40 5.45 5.50 1 2 3 UNR-3.3/8000-D5 Minimum Input Capacitor Value vs. VIN @ Full Load 6 7 8 9 10 11 12 CIN RMS Ripple Current vs. ILOAD CIN RMS Ripple Current (Amps) Input Capacitance (μF) 5 4 10000 1000 100 4.75 4 Output Load Current (Amps) Input Voltage (Volts) 3.5 3 2.5 2 1.5 1 0.5 0 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 5.30 5.35 5.40 5.45 5.50 1 2 UNR-3.3/3000-D5 3 4 5 6 7 8 Output Load Current (Amps) Input Voltage (Volts) Minimum Input Capacitor Value vs. VIN @ Full Load CIN RMS Ripple Current vs. ILOAD 2 1000 CIN RMS Ripple Current (Amps) Input Capacitance (μF) 1.75 100 10 4.75 1.50 1.25 1 0.75 0.50 0.25 0 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 Input Voltage (Volts) 5.25 5.30 5.35 5.40 5.45 5.50 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 Output Load Current (Amps) www.murata-ps.com/support MDC_UNR8-40W.C01 Page 4 of 6 UNR Series Single Output, Non-Isolated, 3.3V 8-40 Watt, DC/DC Converters Reducing Output Ripple/Noise In addition to their internal output capacitors, UNR Series DC/DC converters require the installation of external output capacitors to achieve their published ripple/noise specifications. The selected caps should be low-ESR, tantalum or electrolytic types, and they should be located as close to the converters as possible. Recommended values are listed in the table below. If desired, a synchronizing clock can be applied to pin 2 on "D5" models to control the converter’s internal clock oscillator. The applied clock should be a square wave with a maximum 1µsec "high" duration and an amplitude between +2V and +5V (see On/Off Control) referenced to pin 1 (Logic Ground). The frequency of the synchronizing clock must be higher than that of the standalone converter. Therefore, it should be 85kHz ±5kHz. Part Number Output Capacitor Synchronization Issues UNR-3.3/3000-D5 470µF, 6V, Low ESR UNR-3.3/2500-D12 100µF, 6V, Low ESR UNR-3.3/8000-D5 1000µF, 6V, Low ESR UNR-3.3/12000-D5 1000µF, 6V, Low ESR Because of the comparatively small differential between their input and output voltages, 5V-to-3.3V DC/DC converters capable of sourcing high output current also demand high input current. Most of these high-current DC/DC’s use switching architectures employing fixed-frequency clock oscillators, and their input currents include both dc (average) and ac (ripple) components. Remote On/Off Control and the Logic Ground Pin The On/Off Control pin (pin 2 on "D5" units) may be used for digitally controlled on/off operation. A TTL logic high (+2 to +5 Volts, 250µA max.) applied to pin 2 disables the converter. A TTL logic low (0 to +0.8 Volts, 70µA max.), or no connection, enables the converter. Control voltages should be referenced to pin 1 (Logic Ground). Applying a voltage to the Control pin when no input power is applied to the converter can cause permanent damage to the converter. The Input Return (pin 5), Output Return (pin 4) and Logic Ground (pin 1 on "D5" models) are all tied together internal to the device. To the extent possible, load current should be returned to pin 4. Pin 5 should be connected back to the input supply with as low an impedance as possible so that input return current flows through pin 5. The internal trace leading to the Logic Ground pin is not designed to carry high currents. Devices should not be installed in a manner that results in high current flow through pin 2 (i.e., pins 4 and 5 should never be left open or attached via high-impedance connections). If you have multiple DC/DC’s connected to a single main power bus, you may need to consider that all the converters will not be switching at exactly the same frequency (due to normal component and manufacturing tolerances). Consequently, the converters may randomly "self-synchronize" in their demanding of peak current from the main power bus. Peak currents all drawn simultaneously can be significantly greater than the sum of average input currents. This phenomenon can result in unwanted harmonic interactions from converter to converter along the power bus. One solution to this potential problem is to use the converters' On/Off Control function to effectively "de-synchronize" their clocks. Forcing the multiple clocks to be out of phase with each other relaxes the required performance characteristics of the main power bus so the bus now has to carry the sum of the average currents of all the converters plus only one peak current. "D12" models do not have On/Off Control functions. Their pin 2 (No Connect) is not electrically connected to any internal circuitry and may be tied to any convenient external run. Their pin 1 (Do Not Connect) is a test point. Pin 1 may be soldered to an island for mechanical mounting purposes, but it should not have an electrical connection to external circuitry. Synchronization www.murata-ps.com/support MDC_UNR8-40W.C01 Page 5 of 6 UNR Series Single Output, Non-Isolated, 3.3V 8-40 Watt, DC/DC Converters UNR-3.3/8000-D5 Radiated Emissions FCC Part 15 Class B, 3 Meters Converter Output = 3.3Vdc @ 6.4A Custom Capabilities DATEL’s world-class design, development and manufacturing team stands ready to work with you to deliver the exact power converter you need for your demanding, large volume, OEM applications. And ... we’ll do it on time and within budget! 80 70 We have compiled a large library of DC/DC designs that are currently used in a variety of telecom, medical, computer, railway, aerospace and industrial applications. We may already have the converter you need. Radiated Emissions (dBµV/M) 60 Our experienced applications and design staffs; quick-turn prototype capability; highly automated, SMT assembly facilities; and in-line SPC quality-control techniques combine to give us the unique ability to design and deliver any quantity of power converters to the highest standards of quality and reliability. FCC Class B Limit 50 40 30 20 10 0 Radiated Emissions 10 Contact us. Our goal is to provide you the highest-quality, most cost-effective power converters available. 20 Frequency (MHz) EMI Radiated Emissions UNR 3.3/8000 D5 Radiated Emissions EN 55022 Class B, 10 Meters Converter Output = 3.3Vdc @ 6.4A 80 70 60 Radiated Emissions (dBμV/M) If you’re designing with EMC in mind, please note that all of DATEL’s UNR 8-40 Watt DC/DC Converters have been characterized for radiated and conducted emissions in our new EMI/EMC laboratory. Testing is conducted in an EMCO 5305 GTEM test cell utilizing EMCO automated EMC test software. Radiated emissions are tested to the limits of FCC Part 15, Class B and CISPR 22 (EN 55022), Class B. Correlation to other specifications can be supplied upon request. Radiated emissions plots to FCC and CISPR 22 for model UNR-3.3/8000-D5 appear below. Published EMC test reports are available for each model number. Contact DATEL’s Applications Engineering Department for more details. 1000 100 50 EN 55022 Class B Limit 40 30 20 10 0 Radiated Emissions –10 –20 1000 100 Frequency (MHz) 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. © 2013 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_UNR8-40W.C01 Page 6 of 6