ULQ Models www.murata-ps.com Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Typical units Features Standard quarter-brick package/pinout in through-hole or SMT version Low cost; Low profile, 0.35" (8.9mm) 24V and 48V nominal inputs Output current: 8 to 25 Amps Output voltages: 1.2/1.5/1.8/2/2.5/3.3/5/12V Interleaved synchronous-rectifier topology * Ultra high efficiency * No output reverse conduction Outstanding thermal performance On/off control, trim & sense functions Fully isolated, 2250Vdc (BASIC) Output overvoltage protection Fully I/O protected; Thermal shutdown UL/EN/IEC60950 safety approvals Qual/HALT/EMI tested For applications requiring improved electrical and thermal perfomance at reduced cost DATEL's new ULQ Series "Quarter-Brick" DC/DC Converters suit perfectly. They measure just 1.45 x 2.30 x 0.35 inches (36.8 x 58.4 x 8.9mm) and fit the industry-standard footprint. You can also "pick-andplace" the ULQ-SMT version optimizing your automated SMT process. From an 18-36V or 36-75V input, ULQ's deliver outputs of 1.2, 1.5, 1.8, or 2V fully rated at 15 or 25A, 2.5 or 3.3V at 15 or 20A, 5V at 15A and 12V at 8-10A. They employ an interleaved, synchronous-rectifier topology that exploits 100% of their duty cycle. They simultaneously achieve ultra-high efficiency (to 91%), tight line/load regulation (0.125/0.25%), low noise (25-70mVp-p), and quick step response (200sec). A state of the art, single-board, open-frame design with reduced component count, high efficiency, low-on-resistance FET's, and planar magnetics embedded in heavy-copper pc boards all contribute to impressive thermal derating. The ULQ's feature set includes high isolation (2250Vdc), input pi filters, input undervoltage shutdown, output overvoltage protection, current limiting, short-circuit protection and thermal shutdown. The standard footprint carries on/off control (positive or negative polarity), output trim (+10/-20%) and output sense functions. All ULQ quarter-bricks are designed to meet the BASIC-insulation requirements of UL/EN/ IEC60950 and they will carry the CE mark. Safety certifications, EMC compliance testing and qualification testing (including HALT) are currently in progress. Contact DATEL for latest updates. +SENSE (7) +VOUT (8) +VIN (3) SWITCH CONTROL -VOUT (4) -VIN (1) -SENSE (5) PWM CONTROLLER INPUT UNDERVOLTAGE, INPUT OVERVOLTAGE, AND OUTPUT OVERVOLTAGE COMPARATORS REMOTE ON/OFF CONTROL* (2) OPTO ISOLATION REFERENCE & ERROR AMP VOUT TRIM (6) * Can be ordered with positive (standard) or negative (optional) polarity. Figure 1. Simplified Schematic Typical topology is shown. For full details go to www.murata-ps.com/rohs Typical topology is shown www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 1 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Performance Specifications and Ordering Guide ORDERING GUIDE 1.5 1.5 1.5 1.8 1.8 1.8 2 2 2 2.5 3.3 3.3 3.3 5 5 12 12 15 25 25 15 25 25 15 25 25 15 15 20 20 15 15 8 10 Output R/N (mVp-p) Typ. Max. 25 50 45 25 50 70 25 50 70 35 45 50 45 50 50 95 90 Regulation (Max.) Line Load 50 100 75 50 100 100 50 100 100 55 75 100 75 100 100 130 130 0.125% 0.125% 0.125% 0.125% 0.125% 0.25% 0.125% 0.125% 0.25% 0.125% 0.125% 0.125% 0.125% 0.25% 0.1% 0.25% 0.25% VIN Nom. (Volts) Input Range (Volts) IIN (mA/A) Min. Typ. Package (Case, Pinout) 48 24 48 48 24 48 48 24 48 48 48 24 48 24 48 24 48 36-75 18-36 36-75 36-75 18-36 36-75 36-75 18-36 36-75 36-75 36-75 18-36 36-75 18-36 36-75 18-36 36-75 35/0.5 50/1.8 30/0.9 35/0.6 90/2.2 45/1.1 45/0.6 50/2.4 50/1.2 45/0.9 45/1.2 80/3.1 45/1.6 50/3.5 50/1.7 90/4.4 80/2.9 87% 85.5% 85% 87.5% 85.5% 85.5% 87% 86% 86% 88% 88.5% 87.5% 88% 89% 89% 89% 88% 89% 87.5% 87% 89% 87.5% 87.5% 89% 88% 88% 89.5% 90.5% 89.5% 90% 91% 91% 90.5% 90% C37, P32 C37, P32 C37, P32 C37, P32 C37, P32 C37, P32 C37, P32 C37, P32 C37, P32 C37/C40, P32 C37/C40, P32 C37/C40, P32 C37/C40, P32 C37/C40, P32 C37/C40, P32 C37/C40, P32 C37/C40, P32 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.4% 0.25% 0.25% Typical at TA = +25C under nominal line voltage and full-load conditions. All models are specified with an external 1F multi-layer ceramic and 10F capacitors across their output pins. Ripple/Noise (R/N) measured over a 20MHz bandwidth. Devices have no minimum-load requirements and will regulate under no-load conditions. Regulation specifications describe the output voltage deviation as the line voltage or load is varied from its nominal/midpoint value to either extreme. (Load step = 50%.) Nominal line voltage, no load/full load condition. Please refer to the Part Number Structure when ordering. Not all model number combinations are available. Consult Murata Power Solutions. MECHANICAL SPECIFICATIONS 2.30 (58.4) 2.22 (56.4) OVERALL DIMENSIONS : 2.30 (58.4) x 1.45 (36.8) x 0.70 (17.8) BEFORE REMOVAL OF PROTECTIVE HEAT SHIELD PINS 1-3, 5-7: 0.040 0.001 (1.016 0.025) PINS 4, 8: 0.062 0.001 (1.575 0.025) 2.00 (50.8) A 0.35 (8.9) PROTECTIVE HEAT SHIELD B PLASTIC STANDOFFS ARE RELIEVED 0.030 (0.76) IN SOLDER JOINT AREA 0.125 MIN. (3.2) 0.150 (3.81) A A B 0.375 MAX. (9.53) Efficiency 1 0.125 (3.2) Case C40 Surface-mount Package 4 B B 5 2 4 5 6 2 7 3 3 1.35 (34.3) 1 See page 16 for the recommneded pad layout dimensions. B IOUT (Amps) B ULQ-1.5/15-D48N-C ULQ-1.5/25-D24P-C ULQ-1.5/25-D48N-C ULQ-1.8/15-D48N-C ULQ-1.8/25-D24P-C ULQ-1.8/25-D48N-C ULQ-2/15-D48N-C ULQ-2/25-D24P-C ULQ-2/25-D48N-C ULQ-2.5/15-D48N-C ULQ-3.3/15-D48N-C ULQ-3.3/20-D24P-C ULQ-3.3/20-D48N-C ULQ-5/15-D24P-C ULQ-5/15-D48N-C ULQ-12/8-D24P-C ULQ-12/10-D48N-C VOUT (Volts) 1.45 (36.8) Root Model 6 7 8 0.600 (15.2) 0.110 (2.79) 0.300 (7.6) BOTTOM VIEW 8 0.600 (15.2) 4 EQ. SP. @ 0.150 (3.81) 0.600 (15.2) 0.300 (7.6) BOTTOM VIEW Case C37, Through-Hole Package 0.600 (15.2) 4 EQ. SP. @ 0.150 (3.81) PART NUMBER STR UCTURE DOSA-Compatible I/O Connections Pin 1 2 3 4 Function P32 -Input* Remote On/Off** +Input* -Output Pin 5 6 7 8 Function P32 -Sense Output Trim +Sense +Output * These converters are pin-for-pin/plug-compatible to competitive units. Other units may use different pin numbering or alternate outline views. When laying out your PC board, follow the pin FUNCTION. DOSA designates Pin 1 as +Input and Pin 3 as -Input. ** The Remote On/Off can be provided with either positive ("P" suffix) or negative ("N" suffix) polarity. Dimensions are in inches (mm) shown for ref. only. Third Angle Projection U LQ - 3.3 / 20 - D48 N M Lx - C Output Configuration RoHS-6 compliant Pin Length Option Quarter-Brick Package Tolerances (unless otherwise specified): .XX 0.02 (0.5) .XXX 0.010 (0.25) Angles 2 Surface-Mount Package (see list above) Nominal Output Voltage Components are shown for reference only. Maximum Rated Output Remote On/Off Control Polarity Input Voltage Range See page 16 for complete Part Number Structure. www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 2 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Performance/Functional Specifications Typical @ TA = +25C under nominal line voltage, full-load conditions, unless noted. (1) Input Calculated MTBF: Input Voltage Range: (2) D24 Models D48 Models 18-36 Volts (24V nominal) 36-75 Volts (48V nominal) Overvoltage Shutdown D24 Models D48 Models 37-41 Volts (39V typical) None (3) Start-Up Threshold: (4) D24 Models D48 Models 16-18 Volts (17.5V typical) 34-36 Volts (35V typical) Undervoltage Shutdown: (4) D24 Models D48 Models 15.5-17.5 Volts (16.75V typical) 32.5-34.5 Volts (33.5V typical) Input Current: Normal Operating Conditions Inrush Transient Short Circuit Standby Mode: Off, UV, Thermal Shutdown PCB Temperature: (4) (7) Maximum Allowable Thermal Shutdown -40 to +85C with derating +100C +105 to 120C, +115C typical Physical Dimensions See Mechanical Dimensions Pin Material (through-hole) Gold-plated copper alloy with nickel underplate Pad Material (SMT) Copper alloy, pure tin over nickel underplate Weight: 1 ounce (28 grams) EMI Conducted and Radiated FCC Part 15, EN55022 may require external filter Safety UL/IEC/EN60950-1 CSA-C22.2 No. 234 4-10mA Internal Input Filter Type Pi All models are tested and specified with external output capacitors (1F ceramic in parallel with 10F tantalum), unless otherwise noted. These converters have no minimum-load requirements and will effectively regulate under no-load conditions. (2) Contact Murata Power Solutions for input voltage ranges other than those listed. (3) See Absolute Maximum Ratings for allowable input voltages. (4) See Technical Notes/Performance Curves for additional explanations and details. (5) Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 33F input capacitor and a simulated source impedance of 220F and 12H. See I/O Filtering, Input Ripple Current and Output Noise for details. (6) The On/Off Control is designed to be driven with open-collector (or equivalent) logic or the application of appropriate voltages (referenced to -Input (pin 1)). See Remote On/Off Control for more details. (7) All models are fully operational and meet published specifications, including "cold start," at -40C. (8) Extreme Accuracy refers to the accuracy of either trimmed or untrimmed output voltages over all normal operating ranges and combinations of input voltage, output load and temperature. (9) See Output Trimming for detailed trim equations. (10) The Current-Limit Inception point is the output current level at which the ULQ's power-limiting circuitry drops the output voltage 2% from its initial value. See Output Current Limiting and Short-Circuit Protection for more details. (11) See Performance Curves for additional information. (12) For the Start-Up Time specifications, output settling is defined by the output voltage having reached 1% of its final value. (13) MTBF's are calculated using Telcordia (Bellcore) Method 1 Case 3, ground fixed conditions, +40C case temperature, and full-load conditions. (1) 1 minute duration, 5A maximum Remote On/Off Control (Pin 2): (6) Positive Logic ("P" Suffix Models) On = open, open collector or 3.5-13V applied Off = pulled low to 0-0.8V IIN = 6mA max. Negative Logic ("N" Suffix Models) On = pulled low to 0-0.8V IIN = 6mA max. Off = open, open collector or 3.5-13V applied Output Minimum Loading No load VOUT Accuracy (Full Load): Initial Temperature Coefficient Extreme (8) 1.25% maximum 0.02% per C 3% VOUT Trim Range (9) +10%, -20% Remote Sense Compensation (4) +10% Ripple/Noise (20MHz BW) See Ordering Guide Line/Load Regulation See Ordering Guide Efficiency See Ordering Guide Isolation Voltage: Input-to-Output 2000Vdc minimum, D24 models 2250Vdc minimum, D48 models Isolation Resistance 100M Isolation Capacitance 470pF Current Limit Inception (98% VOUT) (10) After warmup +125% of maximum rated current Short Circuit: (4) Current Duration Hiccup with auto-restart Continuous Overvoltage Protection: (4) OVP method (4) (14) Primary-to-Secondary Insulation Level Basic 8-50mAp-p Reverse-Polarity Protection Operating Temperature (Ambient): See derating curves See Ordering Guide 0.05A2 sec maximum 50-100mA Input Reflected Ripple Current (5) (3) Environmental TBD million hours (13) VOUT nominal +20% Comparator magnetic feedback Dynamic Characteristics Dynamic Load Response (11) (50% Load Step) 60-300sec, model dependent Start-Up Time: (4) (12) VIN to VOUT; On/Off to VOUT 30msec typical, 50msec maximum Switching Frequency 160-300kHz, model dependent Maximum Capacitive Load 4700 to 10,000F, model dependent Absolute Maximum Ratings Input Voltage: Continuous: Transient (100msec): D24V Models See OVP NA D48V Models 81 Volts 100 Volts Input Reverse-Polarity Protection Input Current must be <5A. 1 minute duration. Fusing recommended. Output Current Current limited. Devices can withstand an indefinite output short circuit. On/Off Control (Pin 2) Max. Voltages Referenced to -Input (pin 1) -0.3 to +13.6 Volts Storage Temperature -55 to +125C Lead Temperature Through-hole Soldering SMT Soldering +300C, 10 seconds Refer to solder profile 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, nor recommended. www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 3 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters TECHNICAL NOTES Input Fusing Certain applications and/or safety agencies may require the installation of fuses at the inputs of power conversion components. Fuses should also be used if the possibility of sustained, non-current-limited, input-voltage polarity reversals exists. For DATEL ULQ series DC/DC converters, we recommend the use of a time delay fuse, installed in the ungrounded input supply line, with a value no greater than 20 Amps. As a rule of thumb however, we recommend the use of a normal-blow or slow-blow fuse with a typical value about twice the maximum input current, calculated at low line with the converter's minimum efficiency. All relevant national and international safety standards and regulations must be observed by the installer. For system safety agency approvals, the converters must be installed in compliance with the requirements of the enduse safety standard, i.e. IEC/EN/UL60950. Input Reverse-Polarity Protection If the input voltage polarity is accidentally 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 appropiately fused, it could cause permanent damage to the converter. Input Undervoltage Shutdown and Start-Up Threshold Under normal start-up conditions, devices will not begin to regulate properly until the ramping-up input voltage exceeds the Start-Up Threshold Voltage. Once operating, devices will not turn off until the input voltage drops below the Undervoltage Shutdown limit. Subsequent re-start will not occur until the input is brought back up to the Start-Up Threshold. This built in hysteresis prevents any unstable on/off situations from occurring at a single input voltage. A built-in hysterisis for all models will not allow the converter to restart until the input voltage is sufficiently reduced. All 48VIN models have the overvoltage shutdown function disabled, based on requirements to withstand brief input surges and transients to 100V for up to 100msec without voltage interruption. Contact DATEL to have input overvoltage shutdown for 48VIN models enabled. Input Source Impedance The input of ULQ converters must be driven from a low ac-impedance source. The DC/DC's performance and stability can be compromised by the use of highly inductive source impedances. The input circuit shown in Figure 2 is a practical solution that can be used to minimize the effects of inductance in the input traces. For optimum performance, components should be mounted close to the DC/DC converter. I/O Filtering, Input Ripple Current, and Output Noise All models in the ULQ Series are tested/specified for input reflected ripple current and output noise using the specified external input/output components/circuits and layout as shown in the following two figures. External input capacitors (CIN in Figure 2) serve primarily as energy-storage elements, minimizing line voltage variations caused by transient IR drops in conductors from backplane to the DC/DC. Input caps should be selected for bulk capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The switching nature of DC/DC converters requires that dc voltage sources have low ac impedance as highly inductive source impedance can affect system stability. In Figure 2, CBUS and LBUS simulate a typical dc voltage bus. Your specific system configuration may necessitate additional considerations. TO OSCILLOSCOPE Start-Up Time The On/Off Control to VOUT start-up time assumes the converter has its nominal input voltage applied but is turned off via the On/Off Control pin. The specification defines the interval between the point at which the converter is turned on (released) and the fully loaded output voltage enters and remains within its specified accuracy band. Similar to the VIN to VOUT start-up, the On/Off Control to VOUT start-up time is also governed by the internal soft start circuitry and external load capacitance. The difference in start up time from VIN to VOUT and from On/Off Control to VOUT is therefore insignificant. Input Overvoltage Shutdown All 24VIN ULQ DC/DC's are equipped with input overvoltage protection. Input voltages exceeding the input overvoltage shutdown specification listed in the Performance/Functional Specifications will cause the device to shutdown. 3 +INPUT LBUS + The VIN to VOUT Start-Up Time is the time interval between the point at which the ramping 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, and the slew rate and final value of the input voltage as it appears at the converter. The ULQ Series implements a soft start circuit to limit the duty cycle of its PWM controller at power up, thereby limiting the input inrush current. CURRENT PROBE VIN CBUS CIN - 1 -INPUT CIN = 33F, ESR < 700m @ 100kHz CBUS = 220F, ESR < 100m @ 100kHz LBUS = 12H Figure 2. Measuring Input Ripple Current In critical applications, output ripple/noise (also referred to as periodic and random deviations or PARD) may be reduced below specified limits using filtering techniques, the simplest of which is the installation of additional external output capacitors. They function as true filter elements and should be selected for bulk capacitance, low ESR and appropriate frequency response. All external capacitors should have appropriate voltage ratings and be located as close to the converter as possible. Temperature variations for all relevant parameters should also be taken carefully into consideration. The most effective combination of external I/O capacitors will be a function of line voltage and source impedance, as well as particular load and layout conditions. Our Applications Engineers can recommend potential solutions and discuss the possibility of our modifying a given device's internal filtering to meet your specific requirements. Contact our Applications Engineering Group for additional details. www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 4 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters In Figure 3, the two copper strips simulate real-world pcb impedances between the power supply and its load. In order to minimize measurement errors, scope measurements should be made using BNC connectors, or the probe ground should be less than 1/2 inch and soldered directly to the fixture. +SENSE +OUTPUT 7 COPPER STRIP 8 tion, the output voltage will decrease proportionately with increases in output current, thereby maintaining somewhat constant power dissipation. This is commonly referred to as power limiting. Current limit inception is defined as the point at which the full-power output voltage falls below the specified tolerance. See Performance/Functional Specifications. If the load current, being drawn from the converter, is significant enough, the unit will go into a short circuit condition as described below. Short Circuit Condition C1 C2 RLOAD SCOPE 4 -OUTPUT 5 -SENSE COPPER STRIP C1 = 0.1F CERAMIC C2 = 10F TANTALUM LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 3. Measuring Output Ripple/Noise (PARD) 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 primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period, the PWM will restart causing the output voltage to begin ramping to their appropriate value. If the short-circuit condition persists, another shutdown cycle will be initiated. This on/off cycling is referred to as "hiccup" mode. The hiccup cycling reduces the average output current, thereby preventing internal temperatures from rising to excessive levels. The ULQ Series is capable of enduring an indefinite short circuit output condition. FEATURES AND OPTIONS Floating Outputs Since these are isolated DC/DC converters, their outputs are "floating" with respect to their input. Designers will normally use the -Output (pin 4) as the ground/return of the load circuit. You can however, use the +Output (pin 8) as ground/return to effectively reverse the output polarity. Minimum Output Loading Requirements ULQ converters employ a synchronous-rectifier design topology and all models regulate within spec and are stable under no-load to full load conditions. Operation under no-load conditions however might slightly increase the output ripple and noise. Thermal Shutdown The ULQ converters are equipped with thermal-shutdown circuitry. If environmental conditions cause the temperature of the DC/DC converter to rise above the designed operating temperature, a precision temperature sensor will power down the unit. When the internal temperature decreases below the threshold of the temperature sensor, the unit will self start. See Performance/Functional Specifications. Remote Sense Note: The Sense and VOUT lines are internally connected through low-value resistors. Nevertheless, if the sense function is not used for remote regulation the user should connect the +Sense to +VOUT and -Sense to -VOUT at the DC/DC converter pins. ULQ series converters employ a sense feature to provide point of use regulation, thereby overcoming moderate IR drops in pcb conductors or cabling. The remote sense lines carry very little current and therefore require minimal cross-sectional-area conductors. The sense lines, which are capacitively coupled to their respective output lines, are used by the feedback control-loop to regulate the output. As such, they are not low impedance points and must be treated with care in layouts and cabling. Sense lines on a pcb should be run adjacent to dc signals, preferably ground. In cables and discrete wiring applications, twisted pair or other techniques should be implemented. ULQ series converters will compensate for drops between the output voltage at the DC/DC and the sense voltage at the DC/DC provided that: [VOUT(+) -VOUT(-)] - [Sense(+) -Sense (-)] 10% VOUT Output Overvoltage Protection The ULQ output voltage is monitored for an overvoltage condition using a comparator. The signal is optically coupled to the primary side and if the output voltage rises to a level which could be damaging to the load, the sensing circuitry will power down the PWM controller causing the output voltage to decrease. Following a time-out period the PWM will restart, causing the output voltage to ramp to its appropriate value. If the fault condition persists, and the output voltage again climbs to excessive levels, the overvoltage circuitry will initiate another shutdown cycle. This on/off cycling is referred to as "hiccup" mode. 1 -INPUT +OUTPUT +SENSE Contact and PCB resistance losses due to IR drops 8 IOUT 7 Sense Current 2 ON/OFF CONTROL TRIM 6 LOAD Sense Return -SENSE 5 IOUT Return 3 +INPUT -OUTPUT 4 Contact and PCB resistance losses due to IR drops Current Limiting As soon as the output current increases to approximately 130% of its rated value, the DC/DC converter will go into a current-limiting mode. In this condi- Figure 4. Remote Sense Circuit Configuration www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 5 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Output overvoltage protection is monitored at the output voltage pin, not the Sense pin. Therefore, excessive voltage differences between VOUT and Sense in conjunction with trim adjustment of the output voltage can cause the overvoltage protection circuitry to activate (see Performance Specifications for overvoltage limits). Power derating is based on maximum output current and voltage at the converter's output pins. Use of trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the conveter's specified rating, or cause output voltages to climb into the output overvoltage region. Therefore, the designer must ensure: (VOUT at pins) x (IOUT) rated output power Trimming Output Voltage ULQ converters have a trim capability (pin 6) that enables users to adjust the output voltage from +10% to -20% (refer to the trim equations and trim graphs that follow). Adjustments to the output voltage can be accomplished via a trim pot (Figure 5) or a single fixed resistor as shown in Figures 6 and 7. A single fixed resistor can increase or decrease the output voltage depending on its connection. Resistors should be located close to the converter and have TCR's less than 100ppm/C to minimize sensitivity to changes in temperature. If the trim function is not used, leave the trim pin open. A single resistor connected from the Trim pin (pin 6) to the +Sense (pin 7) will increase the output voltage. A resistor connected from the Trim Pin (pin 6) to the -Sense (pin 5) will decrease the output voltage. Trim adjustments greater than the specified +10%/-20% can have an adverse affect on the converter's performance and are not recommended. Excessive voltage differences between VOUT and Sense, in conjunction with trim adjustment of the output voltage, can cause the overvoltage protection circuitry to activate (see Performance Specifications for overvoltage limits). Temperature/power derating is based on maximum output current and voltage at the converter's output pins. Use of the trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the converter's specified rating, or cause output voltages to climb into the output overvoltage region. Therefore: (VOUT at pins) x (IOUT) rated output power The Trim pin (pin 6) is a relatively high impedance node that can be susceptible to noise pickup when connected to long conductors in noisy environments. In such cases, a 0.22F capacitor can be added to reduce this long lead effect. Trim Equations ULQ-1.2/15-D48 & ULQ-1.2/25-D48 1 -INPUT +OUTPUT +SENSE 2 ON/OFF CONTROL TRIM -SENSE 3 +INPUT -OUTPUT RT UP (k) = 8 5-22 TURNS LOAD RT UP (k) = 5 -INPUT +OUTPUT +SENSE 2 ON/OFF CONTROL TRIM RT UP (k) = 3 RTDOWN (k) = 1.037 1.2 - VO -1.413 6.23(VO - 1.226) VO - 1.5 -10.2 RTDOWN (k) = 7.64 1.5 - VO -10.2 7.44(VO - 1.226) VO - 1.8 -10.2 RTDOWN (k) = 9.12 1.8 - VO -10.2 ULQ-2/15-D48, ULQ-2/15-D24 & D48 8 RT UP (k) = 7 8.28(VO - 1.226) VO - 2 -10.2 RTDOWN (k) = 10.15 2 - VO -10.2 ULQ-2.5/15-D48, ULQ-2.5/20-D24 & D48 6 LOAD RTRIM UP -SENSE -1.413 ULQ-1.8/15-D48, ULQ-1.8/25-D24 & D48 4 Figure 5. Trim Connections Using A Trimpot 1 VO - 1.2 ULQ-1.5/15-D48, ULQ-1.5/25-D24 & D48 7 6 1.308(VO - 0.793) RT UP (k) = 5 10(VO - 1.226) VO - 2.5 -10.2 RTDOWN (k) = 12.26 2.5 - VO -10.2 ULQ-3.3/15-D48, ULQ-3.3/20-D24 & D48 +INPUT -OUTPUT 4 RT UP (k) = Figure 6. Trim Connections To Increase Output Voltages Using Fixed Resistors 13.3(VO - 1.226) VO - 3.3 -10.2 RTDOWN (k) = 16.31 3.3 - VO -10.2 ULQ-5/15-D24, -D48 1 -INPUT +OUTPUT +SENSE 2 RT UP (k) = 7 20.4(VO - 1.226) VO - 5 -10.2 RTDOWN (k) = 25.01 5 - VO -10.2 ULQ-12/8-D24, ULQ-12/10-D48 ON/OFF CONTROL TRIM +INPUT 6 LOAD RTRIM DOWN -SENSE 3 8 -OUTPUT RT UP (k) = 5 49.6(VO - 1.226) VO - 12 -10.2 RTDOWN (k) = 60.45 12 - VO -10.2 4 Figure 7. Trim Connections To Decrease Output Voltages Using Fixed Resistors Note: Resistor values are in k. Adjustment accuracy is subject to resistor tolerances and factory-adjusted output accuracy. VO = desired output voltage. www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 6 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Trim-Up Resistance vs. Percentage Increase in Output Voltage Model ULQ-1.5 1 x 107 Model ULQ-2.5 1 x 107 1 x 106 RESISTANCE RESISTANCE 1 x 106 1 x 105 1 x 105 1 x104 1 x104 1 x103 0 1 2 3 4 5 6 7 8 9 0 10 1 2 3 4 5 6 7 8 9 10 VOUT INCREASE (%) VOUT INCREASE (%) Model ULQ-1.8 1 x 107 1 x 106 1 x 106 Model ULQ-3.3 RESISTANCE RESISTANCE 1 x 107 1 x 105 1 x 105 1 x104 1 x104 0 1 2 3 4 5 6 7 8 9 0 10 1 2 3 5 6 7 8 9 10 Trim-Down Resistance vs. Percentage Decrease in Output Voltage Model ULQ-2 1 x 107 4 VOUT INCREASE (%) VOUT INCREASE (%) 1 x 107 Model ULQ-1.5 Model ULQ-1.8 Model ULQ-2 Model ULQ-2.5 Model ULQ-3.3 RESISTANCE 1 x 106 RESISTANCE 1 x 106 1 x 105 1 x 105 1 x104 0 1 2 3 4 5 6 7 8 9 10 1 x104 VOUT INCREASE (%) 0 2 4 6 8 10 12 14 16 18 20 VOUT DECREASE (%) www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 7 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters On/Off Control ("P" or "N" suffix) The input-side, remote On/Off Control function (pin 2) can be ordered to operate with either polarity: 3 "P" suffix: Standard models are equipped with Positive-polarity and these devices are enabled when pin 2 is left open (or is pulled high, applying +3.5V to +13 with respect to -Input, pin 1) as per Figure 8. Positive-polarity devices are disabled when pin 2 is pulled low (0 to 0.8V with respect to -Input). +INPUT +VCC 2 ON/OFF CONTROL "N" suffix: Optional Negative-polarity devices are off when pin 2 is left open (or pulled high, applying +3.5V to +13V), and on when pin 2 is pulled low (0 to 0.8V) with respect to -Input as shown in Figure 9. -INPUT 1 Figure 9. Driving the Negative Polarity On/Off Control Pin 3 +INPUT 13V CIRCUIT 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. 2 ON/OFF CONTROL 1 5V CIRCUIT -INPUT Figure 8. Driving the Positive Polarity On/Off Control Pin Surface-Mount Package ("M" suffix) DATEL is not exempted from the Laws of Physics. And we do not have magic solders no one else has. Nevertheless, we have a simple and practical, straightforward approach that works. We assemble our SMT DC/DC's on a hightemperature, plastic lead-frame (nylon 46, UL94V-0 rated) using a hightemperature (+216C), lead-free alloy (Sn96.2%, Ag2.5%, Cu0.8%, Sb0.5%). The lead-frame ensures coplanarity (to within 0.004 in.) of the unit's tin-plated (150 microinches) copper leads and also supports a removable heat shield. DATEL's ULQ series SMT DC/DC converters are the only higher-power (to 66W) DC/DC's that can be automatically "pick-and-placed" using standard vacuum-pickup equipment and subsequently reflowed using high-temperature, lead-free solder. Virtually all SMT DC/DC's today are unprotected "open-frame" devices assembled by their vendors with high-temperature solder (usually Sn96.5/Ag3.5 with a melting point +221C) so that you may attach them to your board using low-temperature solder (usually Sn63/Pb37 with a melting point of +183C). Conceptually straightforward, this "stepped" solder approach has its limitations . . . and is clearly out of step with an industry trending toward the broad use of lead-free solders. No need to experiment and develop reflow profiles that ensure the components on their DC/DC never exceed 215-216C. If those components get too hot, "double-reflow" could compromise the reliability of their solder joints. Virtually all these devices demand you "cool down" the Sn63 profile you are likely using today. The disposable heat shield, which has a cutaway exposing the package leads, provides thermal insulation to internal components during reflow and also doubles as the vacuum pick-up location. The insulation properties of the heat shield are so effective that temperature differentials as high as 50C develop inside-to-outside the shield. Oven temperature profiles with peaks of 250-260C and dwell times exceeding 2 minutes above 221C (the melting point of Sn96.5/Ag3.5) are easily achieved. DATEL's new-generation SMT units are shipped in stackable, JEDEC-style plastic. 250 Degrees Celsius 200 Heat Shield Test Board Air Under Shield 150 100 50 Z1 Z2 100 Figure 10. ULQ SMT DC/DC With Disposable Heat Shield Z3 Z4 200 Z5 Z6 300 Z7 Seconds 400 500 600 Figure 11. Recommended Solder Profile (When The Heat-shield Temperature Exceeds +250C, The Air Within Is 50C Cooler) www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 8 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Typical Performance Curves, 1.5V Models ULQ-1.5/25-D24 Efficiency vs. Line Voltage and Load Current ULQ-1.5/25-D24 Output Current vs. Ambient Temperature (No air flow) 92 90 30 88 25 Output Current (Amps) Efficiency (%) 86 84 VIN = 18V 82 80 VIN = 24V 78 76 20 VIN = 18V 15 VIN = 24V 10 VIN = 36V VIN = 36V 74 5 72 70 2.5 0 -40 5 7.5 10 12.5 15 17.5 20 22.5 0 25 30 35 40 25 45 50 55 60 65 70 75 80 85 90 95 100 80 85 90 95 100 90 95 100 Ambient Temperature (C) Load Current (Amps) ULQ-1.5/15-D48 Efficiency vs. Line Voltage and Load Current ULQ-1.5/15-D48 Output Current vs. Ambient Temperature (No air flow) 92 90 18 88 86 Output Current (Amps) 15 Efficiency (%) 84 82 80 VIN = 36V 78 76 VIN = 48V 74 12 VIN = 36V 9 VIN = 48V 6 VIN = 75V 72 3 70 VIN = 75V 68 66 1.5 0 -40 3 4.5 6 7.5 9 10.5 12 13.5 0 25 30 35 40 45 50 55 60 65 70 75 15 Ambient Temperature (C) Load Current (Amps) ULQ-1.5/25-D48 Efficiency vs. Line Voltage and Load Current ULQ-1.5/25-D48 Output Current vs. Ambient Temperature (VIN = 48V, air flow direction from Input pin to Output pin) 91 89 30 87 Output Current (Amps) Efficiency (%) 25 85 83 VIN = 36V 81 79 VIN = 48V 20 0 lfm 15 100 lfm 200 lfm 10 77 73 2.5 5 VIN = 75V 75 5 7.5 10 12.5 15 17.5 20 22.5 25 0 -40 0 Load Current (Amps) 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 9 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Typical Performance Curves, 1.8V Models ULQ-1.8/15-D48 Efficiency vs. Line Voltage and Load Current ULQ-1.8/15-D48 Output Current vs. Ambient Temperature (No air flow) 92 90 18 88 15 Output Current (Amps) Efficiency (%) 86 84 82 80 VIN = 36V 78 76 VIN = 48V 12 VIN = 36V 9 VIN = 48V 6 VIN = 75V 74 3 72 VIN = 75V 70 68 1.5 0 -40 3 4.5 6 7.5 9 10.5 12 13.5 0 25 30 35 40 15 45 50 55 60 65 70 75 80 85 90 95 100 75 80 85 90 95 100 90 95 100 Ambient Temperature (C) Load Current (Amps) ULQ-1.8/25-D24 Efficiency vs. Line Voltage and Load Current ULQ-1.8/25-D24 Output Current vs. Ambient Temperature (No air flow) 92 90 30 88 25 Output Current (Amps) Efficiency (%) 86 84 82 VIN = 18V 80 VIN = 24V 78 76 74 20 VIN = 18V 15 VIN = 24V 10 VIN = 36V VIN = 36V 72 5 70 68 2.5 5 7.5 10 12.5 15 17.5 20 22.5 0 -40 25 0 25 30 35 40 45 50 55 60 65 70 Ambient Temperature (C) Load Current (Amps) ULQ-1.8/25-D48 Efficiency vs. Line Voltage and Load Current ULQ-1.8/25-D48 Output Current vs. Ambient Temperature (VIN = 48V, air flow direction from Input pin to Output pin) 92 90 30 88 25 84 Output Current (Amps) Efficiency (%) 86 82 80 VIN = 36V 78 76 VIN = 48V 74 72 68 2.1 4.2 6.25 8.3 10.4 12.5 14.6 0 lfm 15 100 lfm 200 lfm 10 5 VIN = 75V 70 20 16.7 18.75 20.8 22.9 25 0 -40 0 Load Current (Amps) 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 10 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Typical Performance Curves, 2V Models ULQ-2/15-D48 Efficiency vs. Line Voltage and Load Current ULQ-2/15-D48 Output Current vs. Ambient Temperature (No air flow) 92 90 18 88 15 Output Current (Amps) Efficiency (%) 86 84 82 80 VIN = 36V 78 76 VIN = 48V 12 VIN = 36V 9 VIN = 48V 6 VIN = 75V 74 3 72 VIN = 75V 70 68 1.5 0 -40 3 4.5 6 7.5 9 10.5 12 13.5 0 25 30 35 40 45 15 50 55 60 65 70 75 80 85 90 95 100 75 80 85 90 95 100 Ambient Temperature (C) Load Current (Amps) ULQ-2/25-D24 Efficiency vs. Line Voltage and Load Current ULQ-2/25-D24 Output Current vs. Ambient Temperature (No air flow) 92 90 30 88 25 Output Current (Amps) Efficiency (%) 86 84 VIN = 18V 82 80 VIN = 24V 78 76 20 VIN = 18V 15 VIN = 24V 10 VIN = 36V VIN = 36V 74 5 72 70 2.5 0 -40 5 7.5 10 12.5 15 17.5 20 22.5 0 25 30 35 40 25 45 50 55 60 65 70 Ambient Temperature (C) Load Current (Amps) ULQ-2/25-D48 Efficiency vs. Line Voltage and Load Current ULQ-2/25-D48 Output Current vs. Ambient Temperature (VIN = 48V, air flow direction from Input pin to Output pin) 92 90 30 88 25 Output Current (Amps) Efficiency (%) 86 84 82 VIN = 36V 80 78 VIN = 48V 76 74 0 lfm 100 lfm 15 200 lfm 10 5 VIN = 75V 72 70 2.5 20 5 7.5 10 12.5 15 17.5 20 22.5 25 0 -40 0 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90 Ambient Temperature (C) Load Current (Amps) www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 11 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Typical Performance Curves, 2.5V Models ULQ-2.5/15-D48 Output Current vs. Ambient Temperature (VIN = 48V, air flow direction from Input pin to Output pin) ULQ-2.5/15-D48 Efficiency vs. Line Voltage and Load Current 94 18 92 90 15 Output Current (Amps) Efficiency (%) 88 86 84 VIN = 36V 82 80 VIN = 48V 12 Natural Convection 100 lfm 9 200 lfm 6 300 lfm 78 400 lfm 3 76 VIN = 75V 74 72 1.5 0 -40 3 4.5 6 7.5 9 10.5 12 13.5 0 25 30 35 40 15 45 50 55 60 65 70 75 80 85 90 95 100 90 95 100 Ambient Temperature (C) Load Current (Amps) ULQ-2.5/20-D48 Efficiency vs. Line Voltage and Load Current ULQ-2.5/20-D48 Output Current vs. Ambient Temperature (VIN = 48V, air flow direction from Input pin to Output pin) 93 91 25 Output Current (Amps) Efficiency (%) 89 87 VIN = 36V 85 VIN = 48V 83 81 VIN = 75V 20 15 100 lfm 200 lfm 10 300 lfm 5 400 lfm 79 77 2 4 6 8 10 12 14 16 18 20 0 -40 0 Load Current (Amps) 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (C) 5,1 $ 0OWER $ISSIPATION VS ,OAD #URRENT 0OWER $ISSIPATION 7ATTS 6). 6 6). 6 6). 6 ,OAD #URRENT !MPS www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 12 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Typical Performance Curves, 3.3V Models ULQ-3.3/15-D48 Output Current vs. Ambient Temperature (VIN = 48V, air flow direction from Input pin to Output pin) ULQ-3.3/15-D48 Efficiency vs. Line Voltage and Load Current 94 18 90 Output Current (Amps) 15 Efficiency (%) 86 82 VIN = 36V 78 VIN = 48V 12 Natural Convection 100 lfm 9 200 lfm 6 300 lfm 400 lfm 3 74 VIN = 75V 0 -40 0 25 30 35 40 45 70 1 2 3 4 5 6 7 8 9 10 11 12 13 14 50 55 60 65 70 75 80 85 90 95 100 Ambient Temperature (C) 15 Load Current (Amps) ULQ-3.3/20-D24 Efficiency vs. Line Voltage and Load Current ULQ-3.3/20-D24 Output Current vs. Ambient Temperature (VIN = 24V, air flow direction from Input pin to Output pin) 93 25 91 Output Current (Amps) Efficiency (%) 89 87 VIN = 18V 85 VIN = 24V 83 81 VIN = 36V 20 15 0 lfm 10 100 lfm 200 lfm 5 400 lfm 79 0 -40 77 2 4 6 8 10 12 14 16 18 0 25 30 35 40 20 45 50 55 60 65 70 75 80 85 90 95 100 Ambient Temperature (C) Load Current (Amps) ULQ-3.3/20-D48 Output Current vs. Ambient Temperature (VIN = 48V, air flow direction from Input pin to Output pin) ULQ-3.3/20-D48 Efficiency vs. Line Voltage and Load Current 93 25 91 Output Current (Amps) Efficiency (%) 89 87 VIN = 36V 85 VIN = 48V 83 20 15 100 lfm 200 lfm 10 300 lfm 81 VIN = 75V 5 79 0 -40 77 2 4 6 8 10 12 14 16 18 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Ambient Temperature (C) Load Current (Amps) www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 13 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Typical Performance Curves, 5V Models 5,1 $. %FFICIENCY 6S ,INE 6OLTAGE !ND ,OAD #URRENT 5,1 $. -AXIMUM /UTPUT #URRENT VS !MBIENT 4EMPERATURE 6). 6 AIR FLOW DIRECTION FROM )NPUT PIN TO /UTPUT PIN %FFICIENCY /UTPUT #URRENT !MPS LFM LFM 6IN 6 6IN 6 6IN 6 6IN 6 LFM LFM n ,OAD #URRENT !MPS !MBIENT 4EMPERATURE o# www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 14 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters Typical Performance Curves, 12V Models 5,1 $. %FFICIENCY VS ,INE 6OLTAGE AND ,OAD #URRENT 5,1 $ -AXIMUM /UTPUT #URRENT VS !MBIENT 4EMPERATURE 6). 6 TRANSVERSE AIR FLOW DIRECTION FROM n/UTPUT TO /UTPUT PIN # /UTPUT #URRENT !MPS %FFICIENCY 6). 6 6). 6 LFM LFM LFM LFM 6). 6 n !MBIENT 4EMPERATURE o# ,OAD #URRENT !MPS 5,1 $. %FFICIENCY VS ,INE 6OLTAGE AND ,OAD #URRENT ULQ-12/10-D48 Output Current vs. Ambient Temperature (VIN = 48V, air flow direction from Input pin to Output pin) # 10.5 10 Output Current (Amps) %FFICIENCY 6). 6 6). 6 9 8.5 100 lfm 8 200 lfm 7.5 300 lfm 7 6). 6 500 lfm 9.5 6.5 6 -40 0 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90 Ambient Temperature (C) ,OAD #URRENT !MPS 5,1 $ 0OWER $ISSIPATION VS ,OAD #URRENT 0OWER $ISSIPATION 7ATTS 6). 6 6). 6 6). 6 ,OAD #URRENT !MPS www.murata-ps.com email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 15 of 16 ULQ Models Single Output, Low-Profile, Quarter-Brick 8-25 Amp Isolated DC/DC Converters For the surface mount versions of the ULQ, use the Recommended SMT Pad Layout illustration as a starting point to locate pads to mount the converter. This diagram is for the pads on the mating printed circuit board--it is not the dimensions of the lead terminals on the converter. Note: the pads are slightly larger than the lead terminals to accomodate solder wetting and meniscus. Also, your particular application may require some deviation from this diagram. 3-4 ,EAD 3-4 5NIT 0#" #OPPER 0AD 2%& 490 4HESE TWO PADS ARE FOR ALIGNMENT AND POSITIONING ONLY 4HEY ARE NOT REQUIRED FOR ELECTRICAL CONTACT Recommended SMT Pad Layout PART NUMBER STR UCTURE U LQ - 3.3 / 20 - D48 N M Lx - C Output Configuration: U = Unipolar RoHS-6 Hazardous Substance Compliant Pin Length Option: Through-hole packages only L1 Pin length 0.110 0.010 inches (2.79 0.25mm) L2 Pin length 0.145 0.010 inches (3.68 0.25mm) Blank is standard pin length Quarter-Brick Package Nominal Output Voltage: 1.2,1.5, 1.8, 2, 2.5, 3.3, 5, 12 Volts Maximum Rated Output : Current in Amps Input Voltage Range: D24 = 18-36 Volts (24V nominal) D48 = 36-75 Volts (48V nominal) Surface-Mount Package* Remote On/Off Control Polarity Add "P" for positive polarity (pin 2 open = converter on) Add "N" for negative polarity (pin 2 open = converter off) Positive polarity is standard for D24 models. Negative polarity is standard for D48 models. Alternate polarities may require a special order. Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED Note: Standard pin length with no "Lx" suffix is 0.125" (3.18mm). The L1 and L2 lengths require a scheduled quantity order. Note: Some model number combinations may not be available. Contact Murata Power Solutions. *See list on pg. 2 using the C40 SMT package. 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) 2011 Murata Power Solutions, Inc. www.murata-ps.com/locations email: sales@murata-ps.com 21 Feb 2011 MDC_ULQ-15A.B03 Page 16 of 16