UEI30 Series www.murata-ps.com 30W Isolated Wide-Range DC/DC Converters Featuring a full 30 Watt output in 1.8 square inches of board area, the UEI series isolated DC/DC converter family offers efficient regulated DC power for printed circuit board mounting. PRODUCT OVERVIEW Typical unit FEATURES Small footprint DC/DC converter, ideal for high current applications 0.92" x 1.92" x 0.35" open frame package Wide range input voltages 9-36 and 18-75Vdc Assembly and attachment for RoHS-6 hazardous substance compliance Isolation up to 2250 VDC (basic), Q48 models Up to 30W total output power with overtemperature shutdown Wide range 4:1 inputs on the 0.92" x 1.92" x 0.35" converter are either 9 to 36 Volts DC (Q12 models) or 18 to 75 Volts DC (Q48 models), ideal for battery-powered and telecom equipment. Fixed output voltages from 3.3 VDC to 15 VDC are tightly regulated and may be trimmed within ±10% of nominal output. Applications include small instruments, computer-based systems, data communications equipment, remote sensor systems, vehicle and portable electronics. programmable logic and FPGA’s. No minimum load is required. For systems requiring controlled startup/shutdown, an external switch, transistor or digital logic may be used to activate the remote On/Off control. Remote Sense inputs compensate for resistive line drops at high currents. A wealth of self-protection features avoid both converter and external circuit problems. These include input undervoltage lockout and overtemperature shutdown. The outputs current limit using the “hiccup” autorestart technique and the outputs may be short-circuited indefinitely. Additional features include output overvoltage and reverse conduction elimination. The UEI 30W Series includes full magnetic and optical isolation up to 2250 Volts DC (basic insulation), Q48 models. For connection to digital systems, the outputs offer fast settling to current step loads and tolerance of higher capacitive loads. Excellent ripple and noise specifications assure compatibility to circuits using CPU’s, ASIC’s, The synchronous rectifier forward topology offers high efficiency for minimal heat buildup and “no fan” operation. High efficiency synchronous rectifier forward topology Stable no-load operation with no required external components Contents Description, Photograph, Connection Diagram Ordering Guide, Model Numbering, Soldering Guidelines Mechanical Specs, Input/Output Pinout Detailed Electrical Specifications Application Notes Performance Data –40 to +85°C temperature range; see derating Certified to UL60950-1, CSA-C22.2 No. 234, EN60950-1 safety approvals Extensive self-protection shut down features RoHS-6 hazardous substance compliant Page 1 2 3 4 6 11 SIMPLIFIED SCHEMATIC +VOUT +VIN GATE DRIVE –VIN –VOUT ISOLATION BARRIER On/Off Control Control For full details go to www.murata-ps.com/rohs Typical topology is shown. OPTO ISOLATION Reference, trim & Error Amplifier www.murata-ps.com TRIM email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 1 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE Output Power R/N (mVp-p) Regulation (Max.) VIN VOUT IOUT Nom. (V) (A) (W) Typ. Max. Line Load (V) Part Numberc Input Range (V) IIN, IIN, full no load load (A) (mA) Open Frame Package, C80 Efficiency Min. Typ. Case Pinout UEI30-033-Q12P-C 3.3 9 29.7 25 35 ±0.2% ±0.25% 24 9-36 130 1.39 87.3% 89% C80 P21 UEI30-033-Q48N-C 3.3 9 29.7 50 75 ±0.2% ±0.25% 48 18-75 50 0.69 87% 89.5% C80 P21 UEI30-050-Q12P-C 5 6 30 35 50 ±0.2% ±0.2% 24 9-36 130 1.4 88% 89.5% C80 P21 UEI30-050-Q48N-C 5 6 30 50 75 ±0.2% ±0.2% 48 18-75 130 0.69 89.5% 91% C80 P21 UEI30-120-Q12P-C 12 2.5 30 60 120 ±0.2% ±0.1% 24 9-36 75 1.4 87.5% 89% C80 P21 UEI30-120-Q48N-C 12 2.5 30 30 60 ±0.2% ±0.1% 48 18-75 40 0.7 87.5% 89% C80 P21 UEI30-150-Q12P-C 15 2 30 40 65 ±0.2% ±0.1% 24 9-36 95 1.4 87.5% 89% C80 P21 UEI30-150-Q48N-C 15 2 30 50 100 ±0.2% ±0.1% 48 18-75 50 0.7 87.5% 89.5% C80 P21 c Please refer to the part number structure for additional options and complete ordering part numbers. d All specifications are at nominal line voltage and full load, +25 deg.C. unless otherwise noted. See detailed specifications. Output capacitors are 1 μF ceramic in parallel with 10 μF electrolytic. Input cap is 22 μF, low ESR. These I/O caps are necessary for our test equipment and may not be needed for your application. e Sense input is not included for 12 Vout and higher models. Sense is optional for 5 Vout and lower. PART NUMBER STRUCTURE UEI30 - 050 - Q48 N Lx - C RoHS-6 hazardous substance compliance (does not claim EU RoHS exemption 7b–lead in solder) Nominal Output Voltage In tenths of a volt Pin Length Option Blank = Std. pin length 0.25˝ (6.3mm) L1 = 0.110˝ (2.79mm) Alternate pin lengths L2 = 0.145˝ (3.68mm) require quantity order. } On/Off Control Polarity: P = Positive N = Negative Positive “P” polarity is standard for Q12 models and optional special order for Q48 models. Negative “N” polarity is standard for Q48 models and optional special order for Q12 models. Note: Not all model number combinations are available. Contact Murata Power Solutions. Input Voltage Range: Q12 = 9-36V Q48 = 18-75V 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 www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 2 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters MECHANICAL SPECIFICATIONS TOP VIEW 1.92 (48.8) PIN #1 Dimensions are in inches (mm shown for ref. only). Third Angle Projection 0.92 (23.4) Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 2˚ SIDE VIEW Components are shown for reference only. 0.35 (8.9) 0.25 (6.4) #6 MOUNTING PLANE BOTTOM VIEW 1.800 (45.72) CL #5 0.040 0.002 PIN WITH 0.071 0.002 SHOULDER 6X AT PINS 1-6 #3 0.900 REF (22.86) END VIEW #2 0.400 (10.16) .0300 (7.62) CL 0.100 (2.54) 0.300 (7.62) .0400 (10.16) CL #1 #4 UEI30 Open Frame 30W Package C80 INPUT/OUTPUT CONNECTIONS PHYSICAL CHARACTERISTICS Pin diameter Copper alloy with gold plate over nickel underplate 0.04" (1.016mm) Pin Finish Gold plate Weight 0.53 oz (15g) Electromagnetic interference EN55022/CISPR22 (requires external filter) Flammability Rating UL 94V-0 Designed to meet IEC/EN/UL/cUL 60950-1, CSA-C22.2 No. 60950-1 Pin material Safety Pin Function P21 1 + Vin 2 - Vin 3 Remote On/Off* Pin 4 5 6 Function P21 + Vout - Vout Trim * The Remote On/Off can be provided with either positive (P suffix) or negative (N suffix) polarity. www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 3 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters INPUT CHARACTERISTICS Model Family UEI30-033-Q12P-C UEI30-033-Q48N-C UEI30-050-Q12P-C UEI30-050-Q48N-C UEI30-120-Q12P-C UEI30-120-Q48N-C UEI30-150-Q12P-C UEI30-150-Q48N-C Remote On/Off Control Input Current Under- Reflected Recom- Internal Reverse Start-up voltage (back) mended Input Polarity On/Off Ripple Inrush Output Low Standby Fuse threshold ShutFilter Short Negative Logic 2 TranProtection Current Positive Logic down Current Line Mode Type sient Circuit V V mA pk-pk A2sec mA A mA A mA “P” model suffix “N” model suffix 9.5 8.5 3.75 6 17.3 16.0* 1.89 6 1 1 OFF=Gnd pin or OFF=open pin 9.5 8.0 3.75 6 None, 50 –0.7 to +1.2V or +10 to +15V 17.0 16.2 1.89 6 install 30 0.05 L-C max. ON=open max. ON=Gnd external 9.5 8.3 3.75 3 6 3.5 pin or +10 to pin or –0.7 to fuse 17.0 16.5 1.85 4 +15V max. +1.2V max. 1 1 9.5 8.3 80 3.72 6 16.9 16.3 50 1.83 4 UEI30-033-Q12P-C UEI30-033-Q48N-C UEI30-050-Q12P-C UEI30-050-Q48N-C UEI30-120-Q12P-C UEI30-120-Q48N-C UEI30-150-Q12P-C UEI30-150-Q48N-C 1 ±10 ±0.02 ABSOLUTE MAXIMUM RATINGS Volts, max. continuous Q12 models Volts, transient, 100 mSec Input Voltage Volts, max. continuous Q48 models Volts, transient, 100 mSec On/Off control, referred to –Vin Input Reverse Polarity Protection Output Overvoltage Output Current Overtemperature Protection Storage Temperature Lead Temperature 2,000 0-36 VDC to rated specifications 50 VDC, no damage 0-75 VDC to rated specifications 100 VDC, no damage -0.7 V. min to +15V max. None, install external fuse VOUT nom. +20% max. Current-limited. Devices can withstand sustained short circuit without damage. The outputs are not intended to accept appreciable reverse current. No Efficiency Line/Load Regulation Overvoltage protection Hiccup auto-start after fault removal V 5.0 5.0 7.0 7.3 15.5 14.1 18.5 24 Ripple/Noise (20 MHz bandwidth)8 % of VNOM 2 Capacitive Loading Max. Adjustment Temperature Range Coefficient Low ESR <0.02Ω Max, resistive load % of VNOM % of VOUT /ºC μF OV protection method OUTPUT CHARACTERISTICS VOUT Accuracy Model Family 50% Load Minimum loading *Specified at half load Magnetic See ordering guide feedback Absolute Maximum Ratings 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. Maximum Ratings Notes The transient specifications indicate that sample lots were successfully tested for 100 mS at the transient stress voltage and were not damaged. As a practical matter in your application, it is often difficult to determine how long an input overvoltage was applied. Therefore, do not exceed the continuous voltage rating. Device includes electronic overtemperature shutdown protection under normal operation. -55 to +125° C. See soldering specifications www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 4 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters ISOLATION CHARACTERISTICS DYNAMIC CHARACTERISTICS Input to Output. Isolation Resistance Min Min VDC MΩ Model Family Isolation Capacitance Insulation Safety Rating Model Family Start-up Time Dynamic Load Response VIN to VOUT Remote On/Off Switching (50-75-50% regulated Frequency to VOUT load step) (Max.) regulated (Max.) pF μsec mSec mSec KHz UEI30-033-Q12P-C 2000 1000 UEI30-033-Q12P-C 120 to 2% 275 UEI30-033-Q48N-C 2250 1000 UEI30-033-Q48N-C 180 to 2% 280 UEI30-050-Q12P-C 2000 1000 UEI30-050-Q12P-C 80 to 2% 275 UEI30-050-Q48N-C 2250 1000 UEI30-050-Q48N-C 100 to 1% 275 UEI30-120-Q12P-C 2000 UEI30-120-Q12P-C 200 to 1% UEI30-120-Q48N-C 2250 1500 UEI30-120-Q48N-C 150 to 1% 275 UEI30-150-Q12P-C 2000 1500 UEI30-150-Q12P-C 150 to 1% 275 UEI30-150-Q48N-C 2250 2000 UEI30-150-Q48N-C 150 to 1% 275 10 1500 Basic 50 50 275 MISCELLANEOUS CHARACTERISTICS Output Current Limit Inception Model Family Output Short Circuit 98% of VOUT, after warmup Protection Method A Output Short Circuit Current A UEI30-033-Q12P-C 11.5 UEI30-033-Q48N-C 11.2 UEI30-050-Q12P-C 7.9 UEI30-050-Q48N-C 7.0 UEI30-120-Q12P-C 4.1 UEI30-120-Q48N-C 3.65 UEI30-150-Q12P-C 3.0 0.5 UEI30-150-Q48N-C 3.25 0.1 max. Relative Storage Thermal Output Short Humidity, Output Circuit Duration Operating Temperature temperature protection/ nonPre-biased range shutdown (output shorted Range condensing setup to ground) ºC ºC ºC 0.3 max. 0.3 max. Current limiting, hiccup auto restart 3.0 0.3 max. 1.5 Continuous Monotonic (external VOUT < VSET) –40 to +85ºC; with Derating (see Notes) –55 to 125ºC 115 To +85ºC/ 85% RH 0.75 Specification Notes: (1) All models are tested and specified with external 1 μF and 10 μF parallel output capacitors and a 22 μF external 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. All specifications are typical unless noted. General conditions for Specifications are +25 deg.C, Vin=nominal, Vout=nominal, full load. Adequate airflow must be supplied for extended testing under power. (2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=33 μF, 100V, Cbus=220 μF, 100V, Lbus=12 μH. (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) Refer to page 10 for MTBF values. (5) The On/Off Control is normally selected by a switch or an open collector or open drain transistor. But it may also be driven with external logic or by applying appropriate external voltages which are referenced to Input Common and do not exceed the On/Off voltage specifications. (6) Output current limiting begins when the output voltage degrades approximately 2% from the selected setting. (7) The outputs are not intended to sink appreciable reverse current. (8) Output noise may be further reduced by adding an external filter. Low voltage logic circuits may have a small voltage margin between logic ZERO and logic ONE, requiring noise suppression. Use only as much output filtering as needed to achieve your noise requirements. Excessive output capacitance can retard transient response or possibly cause instability. Low ESR ceramic capacitors may degrade dynamic performance. Be sure to thoroughly test your system under full load with all components installed. (9) All models are fully operational and meet published specifications, including “cold start” at –40°C. (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. (11) The output overvoltage protection is automatic recovery. The overvoltage may occur either from internal failure or from an external forcing voltage as in a shared power system. (12) Output overvoltage and short circuit protection is non-latching. When the overvoltage fault is removed, the converter will immediately recover. After an output overcurrent or short circuit, “hiccup” operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately resumes normal operation. (13) Do not exceed maximum power specifications when adjusting the output trim. (14) At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load. (15) If reverse polarity is accidentally applied to the input, 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. CAUTION: This product is not internally fused. To comply with safety agency certifications and to avoid injury to personnel or equipment, the user must connect an external fast-blow fuse to the input terminals. See fuse information. www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 5 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters APPLICATION NOTES 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 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. The installer must observe all relevant safety standards and regulations. For safety agency approvals, install the converter in compliance with the end-user safety standard. Input Reverse-Polarity Protection If the input voltage polarity is reversed, an internal diode will become forward biased and likely draw excessive current from the power source. If this source is not current-limited or the circuit appropriately fused, it could cause permanent damage to the converter. 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 Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage. Users should be aware however of input sources near the Under-Voltage Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor recharges. Such situations could oscillate. To prevent this, make sure the operating input voltage is well above the UV Shutdown voltage AT ALL TIMES. Start-Up Delay Assuming that the output current is set at the rated maximum, the Vin to Vout StartUp Delay (see Specifications) is the time interval between the point when the rising input voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage enters and remains within its specified regulation 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. Sometimes only a small ceramic capacitor is sufficient. Since it is difficult to totally characterize all applications, some experimentation may be needed. Note that external input capacitors must accept high speed switching currents. Because of the switching nature of DC/DC converters, the input of these converters must be driven from a source with both low AC impedance and adequate DC input regulation. Performance will degrade with increasing input inductance. Excessive input inductance may inhibit operation. The DC input regulation specifies that the input voltage, once operating, must never degrade below the Shut-Down Threshold under all load conditions. Be sure to use adequate trace sizes and mount components close to the converter. I/O Filtering, 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. External input capacitors (CIN in the figure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient IR drops in the input conductors. Users should select input capacitors for bulk capacitance (at appropriate frequencies), low ESR and high RMS ripple current ratings. In the figure below, the CBUS and LBUS components simulate a typical DC voltage bus. Your specific TO OSCILLOSCOPE VIN + – + – CURRENT PROBE 1 +INPUT LBUS CBUS CIN 2 −INPUT CIN = 33μF, ESR < 700mΩ @ 100kHz CBUS = 220μF, ESR < 100mΩ @ 100kHz LBUS = 12μH Figure 2. Measuring Input Ripple Current system configuration may require additional considerations. Please note that the values of CIN, LBUS and CBUS will vary according to the specific converter model. The On/Off Remote Control interval from inception to VOUT regulated 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. In critical applications, output ripple and noise (also referred to as periodic and random deviations or PARD) may be reduced by adding filter elements such as multiple external capacitors. Be sure to calculate component temperature rise from reflected AC current dissipated inside capacitor ESR. In figure 3, the two copper strips simulate real-world printed circuit impedances between the power supply and its load. In order to minimize circuit errors and standardize tests between units, scope measurements should be made using BNC connectors or the probe ground should not exceed one half inch and soldered directly to the fixture. Input Source Impedance These converters will operate to specifications without external components, assuming that the source voltage has very low impedance and reasonable input voltage regulation. Since real-world voltage sources have finite impedance, performance is improved by adding external filter components. Floating Outputs Since these are isolated DC/DC converters, their outputs are “floating” with respect to their input. The essential feature of such isolation is ideal ZERO CURRENT FLOW between input and output. Real-world converters however do exhibit tiny leakage currents between input and output (see Specifications). These converters include a soft start circuit to moderate the duty cycle of the PWM controller at power up, thereby limiting the input inrush current. www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 6 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters 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 you thoroughly understand the enclosure geometry, entry/exit orifice areas and the fan flowrate specifications. COPPER STRIP +OUTPUT C1 C2 RLOAD SCOPE −OUTPUT COPPER STRIP C1 = 0.1μF CERAMIC C2 = 10μF LOW ES LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 3 – Measuring Output Ripple and Noise (PARD) These leakages consist of both an AC stray capacitance coupling component and a DC leakage resistance. When using the isolation feature, do not allow the isolation voltage to exceed specifications. Otherwise the converter may be damaged. Designers will normally use the negative output (-Output) as the ground return of the load circuit. You can however use the positive output (+Output) as the ground return to effectively reverse the output polarity. Minimum Output Loading Requirements These converters employ a synchronous rectifier design topology. 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. 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 Overvoltage Protection (OVP) This converter monitors its output voltage for an over-voltage condition using an on-board electronic comparator. The signal is optically coupled to the primary side PWM controller. If the output exceeds OVP limits, the sensing circuit will power down the unit, and the output voltage will decrease. After a time-out period, the PWM will automatically attempt to restart, causing the output voltage to ramp up to its rated value. It is not necessary to power down and reset the converter for the this automatic OVP-recovery restart. If the fault condition persists and the output voltage climbs to excessive levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling is referred to as “hiccup” mode. Output Fusing The converter is extensively protected against current, voltage and temperature extremes. However, your 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 external protection. Thermal Shutdown To protect against thermal over-stress, 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. Output Current Limiting As soon as the output current increases to approximately its overcurrent limit, the DC/DC converter will enter a current-limiting mode. The output voltage will decrease proportionally with increases in output current, thereby maintaining a somewhat constant power output. This is commonly referred to as power limiting. Temperature Derating Curves The graphs in the next section 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 temperature and/or current or reduced airflow as long as the average is not exceeded. 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, the magnetically coupled voltage used to develop PWM bias voltage will also drop, thereby shutting down the PWM controller. 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 on/off cycling is called “hiccup mode.” The hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures. Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Also note that “natural convection” is defined as very flow rates which are not using fan-forced airflow. Depending on the application, “natural convection” is usually about 30-65 LFM but is not equal to still air (0 LFM). Murata Power Solutions makes Characterization measurements in a closed cycle wind tunnel with calibrated airflow. We use both thermocouples and an 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. This enhances reliability and continued operation of your application. If the output current is too high, the converter will enter the short circuit condition. Trimming the Output Voltage The Trim input to the converter allows the user to adjust the output voltage over the rated trim range (please refer to the Specifications). In the trim equations and circuit diagrams that follow, trim adjustments use either a trimpot or a single fixed resistor connected between the Trim input and either the +Sense or –Sense terminals. (On some converters, an external user-supplied precision DC voltage www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 7 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters may also be used for trimming). Trimming resistors should have a low temperature coefficient (±100 ppm/deg.C or less) and be mounted close to the converter. Keep leads short. If the trim function is not used, leave the trim unconnected. With no trim, the converter will exhibit its specified output voltage accuracy. Trim Up Trim Down <Connect trim resistor between Trim and –Sense> <Connect trim resistor between Trim and +Sense> There are two CAUTIONs to observe for the Trim input: CAUTION: To avoid unplanned power down cycles, do not exceed EITHER the maximum output voltage OR the maximum output power when setting the trim. Be particularly careful with a trimpot. If the output voltage is excessive, the OVP circuit may inadvertantly shut down the converter. If the maximum power is exceeded, the converter may enter current limiting. If the power is exceeded for an extended period, the converter may overheat and encounter overtemperature shut down. UEI30-033-Q12/-Q48 RT UP (:) = 12775 VO – 3.3 RT UP (:) = 12775 VO – 5 7 5-22 TURNS RTDOWN (:) = 5110 (Vo - 2.5) – 2050 5 – VO VO – 12 – 5110 RTDOWN (:) = 10000 (Vo-2.5) –5110 12 – VO 25000 VO – 15 – 5110 RTDOWN (:) = 10000 (Vo-2.5) –5110 15 – VO Remote On/Off Control On the input side, a remote On/Off Control can be specified with either positive or negative logic as follows: −OUTPUT Trim Equations +INPUT – 2050 Where Vo = Desired output voltage. Adjustment accuracy is subject to resistor tolerances and factory-adjusted output accuracy. Mount trim resistor close to converter. Use short leads. cause instability or oscillation. Keep external connections short to the Trim input. Use shielding if needed. ON/OFF CONTROL – 2050 LOAD Figure 4 – Trim adjustments using a trimpot −INPUT 3.3 – VO UEI30-150-Q12/-Q48 RT UP (:) = +INPUT 25000 +OUTPUT TRIM 5110 (Vo - 2.5) UEI30-120-Q12/-Q48 RT UP (:) = ON/OFF CONTROL RTDOWN (:) = UEI30-050-Q12/-Q48 CAUTION: Be careful of external electrical noise. The Trim input is a senstive input to the converter’s feedback control loop. Excessive electrical noise may −INPUT – 2050 Positive: Models equipped with Positive Logic are enabled when the On/Off pin is left open or is pulled high to +VIN with respect to –VIN. An internal bias current causes the open pin to rise to +VIN. Some models will also turn on at lower intermediate voltages (see Specifications). Positive-polarity devices are disabled when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –VIN. +OUTPUT −INPUT ON/OFF CONTROL LOAD TRIM RTRIM DOWN +INPUT −OUTPUT Figure 5 – Trim adjustments to decrease Output Voltage using a Fixed Resistor +OUTPUT TRIM LOAD R TRIM UP −OUTPUT Figure 6 – Trim adjustments to increase Output Voltage using a Fixed Resistor www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 8 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters Negative: Models with negative polarity are on (enabled) when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –VIN. The device is off (disabled) when the On/Off is left open or is pulled high to +15VDC Max. with respect to –VIN. +VCC Dynamic control of the On/Off function should be able to sink the specified signal current when brought low and withstand appropriate voltage when brought high. Be aware too that there is a finite time in milliseconds (see Specifications) between the time of On/Off Control activation and stable, regulated output. This time will vary slightly with output load type and current and input conditions. 3 ON/OFF CONTROL 1 -INPUT There are two CAUTIONs for the On/Off Control: CAUTION: While it is possible to control the On/Off with external logic if you carefully observe the voltage levels, the preferred circuit is either an open drain/open collector transistor or a relay (which can thereupon be controlled by logic). The On/Off prefers to be set at approx. +15V (open pin) for the ON state, assuming positive logic. Figure 7 – Driving the On/Off Control Pin (suggested circuit) CAUTION: Do not apply voltages to the On/Off pin when there is no input power voltage. Otherwise the converter may be permanently damaged. DC/DC Converter On/Off Enable Control Ground Bounce Protection To improve reliability, if you use a small signal transistor or other external circuit to select the Remote On/Off control, make sure to return the LO side directly to the –Vin power input on the DC/DC converter. To avoid ground bounce errors, do not connect the On/Off return to a distant ground plane or current-carrying bus. If necessary, run a separate small return wire directly to the –Vin terminal. There is very little current (typically 1-5 mA) on the On/Off control however, large current changes on a return ground plane or ground bus can accidentally trigger the converter on or off. If possible, mount the On/Off transistor or other control circuit adjacent to the converter. + Vin Preferred location of On/Off control adjacent to -Vin terminal On/Off Enable On/Off Control Transistor -Vin return Ground plane or power return bus Do not connect control transistor through remote power bus Install separate return wire for On/Off control with remote transistor Figure 8 – On/Off Enable Control Ground Bounce Protection www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 9 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters Mean Time Before Failure (MTBF) Table These figures use a standard MTBF probability calculation as an indication of component parts stress and life derating. The calculaton is based on separate MTBF values for all internal parts in addition to stated environmental conditions. Two MTBF values are presented. The Telcordia method is widely used in industry, particularly telecom. The United States MIL-HDBK method is for military and industrial applications. Please refer to a qualified reliability engineer for more background. MTBF (Hours) Method [1,2] UEI30-033-Q12N-C Model Number 2,676,902 Telcordia UEI30-033-Q12N-C 2,123,124 MIL-HDBK UEI30-033-Q12P-C 2,733,781 Telcordia UEI30-033-Q12P-C 2,142,206 MIL-HDBK UEI30-033-Q48N-C 3,416,592 Telcordia UEI30-033-Q48N-C 3,172,548 MIL-HDBK UEI30-033-Q48P-C 3,427,027 Telcordia UEI30-033-Q48P-C 3,193,652 MIL-HDBK UEI30-050-Q12N-C 2,531,509 Telcordia UEI30-050-Q12N-C 2,207,508 MIL-HDBK UEI30-050-Q12P-C 2,554,127 Telcordia UEI30-050-Q12P-C 2,229,031 MIL-HDBK UEI30-120-Q48N-C 3,072,461 Telcordia UEI30-120-Q48N-C 2,510,927 MIL-HDBK UEI30-120-Q48P-C 2,900,319 Telcordia UEI30-120-Q48P-C 2,495,846 MIL-HDBK UEI30-150-Q48N-C 2,833,366 Telcordia UEI30-150-Q48N-C 2,408,836 MIL-HDBK UEI30-150-Q48P-C 2,776,615 Telcordia UEI30-150-Q48P-C 2,421,938 MIL-HDBK Notes: [1] Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ISSUE 2, ground fixed controlled conditions, Tambient=+25°C, full output load, natural air convection. [2] Mean Time Before Failure is calculated using MIL-HDBK-217FN2, GB ground benign, Tambient=+25°C, full output load, natural air convection. www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 10 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters PERFORMANCE DATA UEI30-033-Q12 Efficiency vs. Line Voltage and Load Current @ 25°C 90 Maximum Current Temperature Derating @Sea Level (VIN = 12V, airflow is from input to output) 9 8.8 85 Natural convection 100 LFM 200 LFM 300 LFM 400 LFM 8.6 8.4 Output Current (Amps) Efficiency (%) 80 Vin = 36 V Vin = 24 V 75 Vin = 12 V Vin = 9 V 70 8.2 8 7.8 7.6 7.4 7.2 65 7 20 25 30 35 40 45 60 0 1 2 3 4 5 6 7 8 50 55 60 65 70 75 80 85 90 80 85 90 Ambient Temperature (ºC) 9 Load Current (Amps) UEI30-033-Q48 Efficiency vs. Line Voltage and Load Current @ 25°C 9.1 90 9 Output Current (Amps) 100 70 Vin = 75 V Vin = 48 V 60 Vin = 24 V 50 Natural convection 100 LFM 200 LFM 8.9 8.8 8.7 8.6 Vin = 18 V 40 8.5 20 25 30 35 40 45 50 55 60 65 70 75 Ambient Temperature (ºC) 30 20 0 1 2 3 4 5 6 7 8 9 Load Current (Amps) UEI30-033-Q48 Maximum Current Temperature Derating @Sea Level (VIN = 48V, airflow is from input to output) 9.1 9 Output Current (Amps) Efficiency (%) 80 Maximum Current Temperature Derating @Sea Level (VIN = 24V, airflow is from input to output) Natural convection 100 LFM 200 LFM 8.9 8.8 8.7 8.6 8.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (ºC) www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 11 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters PERFORMANCE DATA UEI30-050-Q12 Efficiency vs. Line Voltage and Load Current @ 25°C 6.10 90 6.00 Output Current (Amps) 100 Efficiency (%) 80 70 Vin = 36 V Vin = 24 V 60 Vin = 12 V Maximum Current Temperature Derating @Sea Level (VIN = 12 or 24V, airflow is from input to output) Natural convection 5.90 5.80 5.70 5.60 50 Vin = 10 V 5.50 40 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (ºC) 30 6. 00 5. 00 4. 00 3. 00 2. 00 1. 00 0 20 Load Current (Amps) UEI30-050-Q48 Efficiency vs. Line Voltage and Load Current @ 25°C Maximum Current Temperature Derating @Sea Level (VIN = 18V, transverse airflow) 100 90 6.1 80 Output Current (Amps) Efficiency (%) 6.0 70 Vin = 75 V Vin = 48 V 60 Vin = 24 V Vin = 18 V 50 Natural convection 100 LFM 200 LFM 300 LFM 5.9 5.8 5.7 40 5.6 30 5.5 20 25 30 35 40 45 50 55 60 65 Ambient Temperature (ºC) 70 75 80 85 90 6.0 0 5.0 0 4.0 0 2.0 0 1.0 0 0 3.0 0 20 Load Current (Amps) UEI30-050-Q48 Maximum Current Temperature Derating @Sea Level (VIN = 24V, transverse airflow) 6.1 6.1 6.0 6.0 Natural convection Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating @Sea Level (VIN = 48V, transverse airflow) 5.9 5.8 5.7 5.6 5.9 Natural convection 100 LFM 5.8 5.7 5.6 5.5 20 25 30 35 40 45 50 55 60 65 Ambient Temperature (ºC) 70 75 80 85 90 5.5 20 25 30 35 40 45 50 55 60 65 Ambient Temperature (ºC) www.murata-ps.com 70 75 80 85 90 email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 12 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters PERFORMANCE DATA UEI30-120-Q12 Efficiency vs. Line Voltage and Load Current @ 25°C Power Dissipation vs. Load Current @ 25°C 4.5 90 Vin = 36 V 4.0 88 Vin = 12 V Power Dissipation (Watts) 86 84 82 Vin = 36 V Efficiency (%) Vin = 24 V 80 Vin = 24 V 78 Vin = 12 V 76 Vin = 9 V 74 3.5 Vin = 9 V 3.0 2.5 2.0 1.5 72 1.0 70 0.5 0.7 0.9 1.1 68 1.3 1.5 1.7 1.9 2.1 2.3 2.5 Load Current (Amps) 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 Load Current (Amps) UEI30-120-Q12 Maximum Current Temperature Derating @Sea Level (VIN = 9-24V, transverse airflow) Maximum Current Temperature Derating @Sea Level (VIN = 36V, transverse airflow) 2.55 2.55 2.50 2.50 100 LFM 200 LFM 100 LFM Output Current (Amps) Output Current (Amps) 2.45 2.45 2.40 2.40 2.35 2.30 2.35 2.25 2.20 20 2.30 20 25 30 35 40 45 50 55 60 65 70 75 80 25 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (ºC) Ambient Temperature (ºC) www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 13 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters PERFORMANCE DATA UEI30-120-Q48 Efficiency vs. Line Voltage and Load Current @ 25°C Power Dissipation vs. Load Current @ 25°C Vin = 75V 90 4.5 Vin = 48V 88 Vin = 24V 4.0 Power Dissipation (Watts) 86 84 Efficiency (%) 82 Vin = 75 V 80 Vin = 48 V 78 Vin = 24 V 76 Vin = 18V 3.5 3.0 2.5 2.0 Vin = 18 V 74 1.5 72 1.0 70 0.5 0.7 0.9 1.1 68 1.3 1.5 1.7 1.9 2.1 2.3 2.5 Load Current (Amps) 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 Load Current (Amps) UEI30-120-Q48 Maximum Current Temperature Derating @Sea Level (VIN = 18-48V, transverse airflow) 3.00 2.60 2.75 2.55 2.50 2.50 100 LFM Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating @Sea Level (VIN = 75V, transverse airflow) 2.25 2.00 1.75 100 LFM 200 LFM 2.45 2.40 2.35 2.30 1.50 2.25 1.25 2.20 1.00 20 20 25 30 35 40 45 50 55 60 65 70 75 80 25 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (ºC) Ambient Temperature (ºC) www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 14 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters PERFORMANCE DATA UEI30-150-Q12 Efficiency vs. Line Voltage and Load Current @ 25°C Power Dissipation vs. Load Current @ 25°C 4.5 90 4.0 88 Power Dissipation (Watts) 86 84 Efficiency (%) 82 80 Vin = 36 V 78 Vin = 24 V Vin = 12 V 76 Vin = 9 V 3.5 3.0 2.5 Vin = 36 V 2.0 Vin = 24 V 74 1.5 Vin = 12 V 72 Vin = 9 V 1.0 70 0.4 0.5 0.7 0.9 1.0 1.2 1.4 1.5 1.7 1.8 2.0 68 0.4 0.5 0.7 0.9 1.0 1.2 1.4 1.5 1.7 1.8 Load Current (Amps) 2.0 Load Current (Amps) UEI30-150-Q12 Maximum Current Temperature Derating @Sea Level (VIN = 9-24V, transverse airflow) 2.05 Maximum Current Temperature Derating @Sea Level (VIN = 36V, transverse airflow) 2.05 2.00 2.00 Output Current (Amps) Output Current (Amps) 100 LFM 1.95 1.90 100 LFM 200 LFM 300 LFM 1.95 1.90 1.85 1.85 1.80 20 1.80 20 25 30 35 40 45 50 55 60 65 70 75 80 25 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (ºC) Ambient Temperature (ºC) www.murata-ps.com email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 15 of 16 UEI30 Series 30W Isolated Wide-Range DC/DC Converters PERFORMANCE DATA UEI30-150-Q48 Efficiency vs. Line Voltage and Load Current @ 25°C 92 Power Dissipation vs. Load Current @ 25°C 5.0 90 4.5 Power Dissipation (Watts) 88 86 Efficiency (%) 84 82 Vin = 75 V 80 Vin = 48 V Vin = 24 V 78 Vin = 18 V 4.0 Vin = 75V Vin = 48V 3.5 Vin = 24V Vin = 18V 3.0 2.5 2.0 1.5 76 1.0 74 0.7 0.8 1.0 1.1 72 1.2 1.3 1.5 1.6 1.7 1.9 2.0 Load Current (Amps) 0.7 0.8 1.0 1.1 1.2 1.3 1.5 1.6 1.7 1.9 2.0 Load Current (Amps) UEI30-150-Q48 Maximum Current Temperature Derating @Sea Level (VIN = 18-48V, transverse airflow) 2.2 2.2 2.0 2.0 Natural Convection 100 LFM 200 LFM 300 LFM Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating @Sea Level (VIN = 75V, transverse airflow) 1.8 1.6 1.8 1.6 1.4 1.4 1.2 1.2 1.0 1.0 20 20 25 30 35 40 45 50 55 60 65 70 75 80 25 30 85 Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (ºC) Ambient Temperature (ºC) 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. © 2011 Murata Power Solutions, Inc. www.murata-ps.com/locations email: [email protected] 03 Feb 2011 MDC_UEI Series 30W.A14 Page 16 of 16