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| for full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 1 of 13 simplified schematic featuring a full 50-60 watt output in 2.9 square inches of board area, the uei series isolated dc/dc converter family offers efficient regulated dc power for printed circuit board mounting. gate drive opto isolation control reference, trim & error amplifier +v in +v out Cv out Cv in on/off control trim Csense +sense isolation barrier typical topology is shown. typical unit wide range 4:1 inputs on the 1.50" x 1.90" x 0.38" 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 regulated to within 0.05% 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. the uei 50-60w series includes full magnetic and optical isolation up to 2250 volts dc (basic insulation). for connection to digital systems, the outputs offer fast settling to current step loads and tolerance of higher capacitive loads. excellent ripple and noise speci? cations assure compatibil- ity to circuits using cpus, asics, programmable logic and fpgas. no minimum load is required. for systems requiring controlled startup/shut- down, 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, input overvolt- age and overtemperature shutdown. the outputs current limit using the hiccup autorestart technique and the outputs may be short-circuited inde? nitely. additional features include output overvoltage and reverse conduction elimination. the synchronous recti? er forward topology offers high ef? ciency for minimal heat buildup and no fan operation. product overview features small footprint dc/dc converter, ideal for high current applications industry standard 1.50? x 1.90? x 0.38? open frame package and pinout wide range input voltages 9-36 and 18-75vdc assembly and attachment for rohs standards isolation up to 2250 vdc (basic) up to 50-60w total output power with overtemperature shutdown high ef? ciency synchronous recti? er forward topology stable no-load operation with no required external components C40 to +85c temperature range with derating certi? ed to ul60950-1, csa-c22.2 no. 234, en60950-1, 2nd edition safety approvals extensive self-protection shut down features rohs-6 compliant $
www.murata-ps.com part number structure uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 2 of 13 these are partial model numbers. please refer to the full model number structure for complete ordering part numbers. sense input is not included for 12 v out and higher models. sense is optional for 5 v out and lower. all speci? cations are typical at nominal line voltage and full load, +25 deg.c. unless otherwise noted. see detailed speci? cations. output capacitors are 1 f ceramic || 10 f electrolytic. input cap is 22 f, low esr. i/o caps are necessary for our test equipment and may not be needed for your application. maximum rated output current in amps nominal output voltage uei - / q12 - 3.3 15 input voltage range: q12 = 9-36v q48 = 18-75v c rohs-6 hazardous substance compliance (does not claim eu rohs exemption 7bClead in solder) - p r note: not all model number combinations are available. contact murata power solutions. sense inputs (5 v out and lower): r = sense included as standard (for 5 v out and lower models only. 12 v out and higher models do not offer the sense option.) blank = sense not installed for 5 v out and lower models. pins 5 and 8 omitted. performance specifications and ordering guide root model output input ef? ciency sense input package v out (v) i out (a) power r/n (mvp-p) regulation (max.) v in nom. (v) range (v) i in , no load (ma) i in , full load (a) (w) typ. max. line load min. typ. case pinout uei-3.3/15-q12pr-c 3.3 15.0 49.5 15 30 0.05% 0.06% 24 9-36 130 2.33 86.8% 88.5% yes c74 p52 uei-3.3/18-q48nr-c 3.3 18.0 59.4 60 125 0.075% 0.2% 48 18-75 130 1.38 87% 89.5% yes c74 p52 uei-5/10-q12pr-c 5 10.0 50.0 35 50 0.1% 0.1% 24 9-36 130 2.31 89% 90% yes c74 p52 uei-5/12-q48nr-c 5 12.0 60.0 70 100 0.1% 0.15% 48 18-75 130 1.37 89.5% 91% yes c74 p52 uei-12/4.2-q12p-c 12 4.2 50.4 50 120 0.05% 0.05% 24 9-36 130 2.35 87.8% 89.5% no c74 p51 uei-12/5-q48n-c 12 5.0 60.0 40 70 0.2% 0.2% 48 18-75 130 1.42 87% 89.8% no c74 p51 uei-15/3.3-q12p-c 15 3.3 49.5 30 100 0.075% 0.05% 24 9-36 130 2.29 88.3% 90% no c74 p51 uei-15/4-q48n-c 15 4.0 60.0 35 60 0.075% 0.05% 48 18-75 50 1.40 87.5% 89.3% no c74 p51 soldering guidelines murata power solutions recommends the speci? cations below when installing these converters. these speci? cations vary dependin g on the solder type. exceeding these speci? ca- tions may cause damage to the product. your production environment may differ; therefore please thoroughly review these guideli nes 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 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. www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 3 of 13 mechanical specifications physical characteristics outline dimensions see mechanical specs pin material copper alloy with gold plate over nickel underplate pin diameter 0.04" (1mm) pin finish gold plate weight 1 oz (28.5g) electromagnetic interference meets class b, en55022/cispr22 (requires external ? lter) flammability rating ul 94v-0 safety certi? ed to iec/en/ul/cul 60950-1, csa-c22.2 no. 60950-1, 2nd edition pins 5 and 8 are omitted for models without sense inputs. input/output connections, without sense pin function p51 pin function p51 5 no pin 1 positive input 6 positive output 2 negative input no pin 3 no pin 7 negative output 4 on/off control in 8 no pin 9 trim third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 2? input/output connections, with sense pin function p52 pin function p52 5 +sense in 1 positive input 6 positive output 2 negative input no pin 3 no pin 7 negative output 4 on/off control in 8 Csense in 9 trim important: if sense inputs are not connected to a remote load, connect them to their respective v out pins at the converter. uei50 open frame 50-60w case c74 .200 .600 15.24 2.54 .100 2.54 .500 .100 12.70 5.08 .400 .200 10.16 5.08 10.16 .400 .900 22.86 min 0.25 .010 min clearance 0.25 6.35 0.38 (9.7) 1.90 (48.3) 1.50 (38.1) 1 2 4 5 6 7 8 9 c l c l c l c l bottom view 1.800 0.05 (1.3) 45.72 side view .040.002 pins 1.020.05 top view 9 8 7 6 5 4 2 1 0.05 (1.3) www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 4 of 13 input characteristics model family v in start-up threshold under- voltage shut- down re? ected (back) ripple current 2 input current recom- mended fuse internal input filter type reverse polarity protection remote on/off control inrush tran- sient output short circuit low line standby mode on/off current positive logic negative logic v v v ma pk-pk a 2 sec ma a ma a ma p model suf? x n model suf? x uei-3.3/15-q12 24 9.5 8.5 30 0.05 50 6.25 1 12 l-c none - see notes 1 off=gnd pin or C0.7 to +1.2v max. on=open pin or +10 to +15v max. off=open pin or +10 to +15v max. on=gnd pin or C0.7 to +1.2v max. uei-3.3/18-q48 48 17.3 16.0 3.71 6 uei-5/10-q12 24 9.5 8.5 6.21 12 uei-5/12-q48 48 17.3 16.0* 3.70 6 uei-12/4.2-q12 24 9.5 8.5 6.31 10 uei-12/5-q48 48 17.5 16.7 3.88 6 uei-15/3.3-q12 24 9.5 8.5 45 6.15 9 uei-15/4-q48 48 17.2 16.3 30 3.77 6 output characteristics model family i out max. v out accuracy adjustment range temperature coef? cient remote sense compensation capacitive loading max. overvoltage protection minimum loading ov protection method ripple/noise (20 mhz bandwidth) 8 line/load regulation ef? ciency 50% load low esr <0.02 max, resistive load hiccup auto-start after fault removal a % of v nom % of v nom % of v out /oc % of v out max. f v uei-3.3/15-q12 15 2 10 0.02 +5 2,000 3.9 no mini- mum load magnetic feedback see ordering guide uei-3.3/18-q48 18 1 +5 3.9 uei-5/10-q12 10 +5 5.9 uei-5/12-q48 12 +5 6.4 uei-12/4.2-q12 4.2 not available 16.5 uei-12/5-q48 5 16 uei-15/3.3-q12 3.3 24 uei-15/4-q48 4 21.5 *at 50% load absolute maximum ratings input voltage q12 models volts, max. continuous 0-36 vdc to rated speci? cations volts, transient, 100 msec 50 vdc, no damage q48 models volts, max. continuous 0-75 vdc to rated speci? cations volts, transient, 100 msec 100 vdc, no damage on/off control, referred to Cvin -0.7 v. min to +15v max. input reverse polarity protection see fuse section output overvoltage v out nom. +20% max. output current current-limited. devices can withstand sustained short circuit without damage. the outputs are not intended to accept appreci- able reverse current. overtemperature protection device includes electronic over- temperature shutdown protection under normal operation. storage temperature -55 to +125 c. lead temperature see soldering speci? cations 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 speci? cations table is not implied nor recommended. maximum ratings notes the uei-50/60w series does not include electronic input overvoltage protection. therefore it is possible for the input to exceed the con- tinuous ratings listed above and still operate. however, units are not routinely production-tested above the continuous ratings. therefore, the rated speci? cations do not apply at excessive input voltage and performance is undetermined. the transient speci? cations indicate that sample lots were suc- cessfully tested for 100 ms at the transient stress voltage and were not damaged. as a practical matter in your application, it is often dif? cult to determine how long an input overvoltage was applied. therefore, do not exceed the continuous voltage rating. www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 5 of 13 miscellaneous characteristics model family output current limit inception output short circuit protection method output short circuit current output short circuit duration (output shorted to ground) pre-biased setup calculated mtbf operating temperature range storage temperature range thermal protection/ shutdown relative humidity, non- condensing 98% of v out , after warmup a a hours oc oc oc uei-3.3/15-q12 20 current limiting, hiccup auto restart 0.5 continuous monotonic (external v out < v set ) 2,000,000 C40 to +85oc; with derating (see notes) C55 to 125oc 115 to +85oc/ 85% uei-3.3/18-q48 23 uei-5/10-q12 13 uei-5/12-q48 15.5 uei-12/4.2-q12 6 uei-12/5-q48 6.1 uei-15/3.3-q12 5.3 uei-15/4-q48 5.8 dynamic characteristics model family dynamic load response (50-75-50% load step) start-up time switching frequency v in to v out regulated (max.) remote on/off to v out regulated (max.) sec msec msec khz uei-3.3/15-q12 100 to 2% v out 50 50 275 uei-3.3/18-q48 180 to 2% v out 280 uei-5/10-q12 200 to 2% v out 275 uei-5/12-q48 100 to 2% v out uei-12/4.2-q12 200 to 1% v out uei-12/5-q48 400 to 1% v out 250 uei-15/3.3-q12 150 to 1% v out 265 uei-15/4-q48 150 to 1% v out 255 isolation characteristics model family input to output. isolation resistance isolation capacitance isolation safety rating min min vdc m pf uei-3.3/15-q12 2000 10 1000 basic insulation uei-3.3/18-q48 2250 10 uei-5/10-q12 2000 10 uei-5/12-q48 2250 10 uei-12/4.2-q12 2000 10 uei-12/5-q48 2250 10 uei-15/3.3-q12 2000 10 uei-15/4-q48 2250 10 speci? cation notes: (1) all models are tested and speci? ed with external 1||10 f output capacitors and a 22 f 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 speci? ed performance in your applications. all models are stable and regulate within spec under no-load conditions. all speci? cations are typical unless noted. general conditions for speci? cations are +25 deg.c, vin=nominal, vout=nominal, full load. adequate air? ow must be supplied for extended testing under power. (2) input back ripple current is tested and speci? ed over a 5 hz to 20 mhz bandwidth. input ? ltering is cin=33 f, 100v, cbus=220 f, 100v, lbus=12 h. (3) note that maximum power derating curves indicate an average current at nominal input voltage. at higher temperatures and/or lower air? ow, the dc/dc converter will tolerate brief full current outputs if the total rms current over time does not exceed the derating curve. all derating curves are presented at sea level altitude. be aware of reduced power dissipation with increasing density altitude. (4) mean time before failure is calculated using the telcordia (belcore) sr-332 method 1, case 3, ground ? xed conditions, tpcboard=+25 deg.c, full load, natural air convection. (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 speci? cations. (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 ? lter. low voltage logic circuits may have a small voltage margin between logic zero and logic one, requiring noise suppression. use only as much output ? ltering 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 speci? cations, including cold start at C40 c. (10) regulation speci? cations 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 current limit and short circuit protection is non-latching. when the overcurrent 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 overcur- rent 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 speci? cations when adjusting the output trim. (14) at zero output current, the output may contain low frequency components which exceed the ripple speci? cation. the output may be operated inde? nitely 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 certi? cations 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 uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 6 of 13 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. we recommend a time delay fuse installed in the ungrounded input supply line with a value which is approximately twice the maximum line current, calcu- lated at the lowest input voltage. 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 perma- nent 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 ramping-up input voltage exceeds and remains at the start-up threshold voltage (see speci? cations). 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 opera- tion 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 capaci- tor inputs), the converter shuts off and then restarts as the external capacitor recharges. such situations could oscillate. to prevent this, make sure the operat- ing input voltage is well above the uv shutdown voltage at all times. start-up time assuming that the output current is set at the rated maximum, the vin to vout start- up time (see speci? cations) is the time interval between the point when the ramping input voltage crosses the start-up threshold and the fully loaded regulated output voltage enters and remains within its speci? ed accuracy band. actual measured application notes c in v in c bus l bus c in = 33f, esr < 700m @ 100khz c bus = 220f, esr < 100m @ 100khz l bus = 12h 1 2 +input ?input current probe to oscilloscope + C + C times will vary with input source impedance, external input capacitance, input volt- age slew rate and ? nal value of the input voltage as it appears at the converter. these converters include a soft start circuit to moderate the duty cycle of its pwm controller at power up, thereby limiting the input inrush current. the on/off remote control interval from on command to v out 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 speci? ed accuracy band. the speci? cation assumes that the output is fully loaded at maximum rated current. similar conditions apply to the on to v out regulated speci? cation such as external load capacitance and soft start circuitry. input source impedance these converters will operate to speci? cations without external components, assuming that the source voltage has very low impedance and reasonable input voltage regulation. since real-world voltage sources have ? nite imped- ance, performance is improved by adding external ? lter components. some- times only a small ceramic capacitor is suf? cient. since it is dif? cult 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 speci? es 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 speci? ed for input re? ected ripple current and output noise using designated external input/output compo- nents, circuits and layout as shown in the ? gures below. external input capaci- tors (c in in the ? gure) 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 ? gure below, figure 2. measuring input ripple current www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 7 of 13 floating outputs since these are isolated dc/dc converters, their outputs are ? oating 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 speci? cations). 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 speci? cations. 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 recti? er design topology. all models regulate within speci? cation and are stable under no load to full load conditions. operation under no load might however slightly increase output ripple and noise. thermal shutdown to prevent many over temperature problems and damage, these converters include thermal shutdown circuitry. if environmental conditions cause the temperature of the dc/dcs to rise above the operating temperature range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. when the temperature decreases below the turn-on threshold, the converter will automatically restart. there is a small amount of hysteresis to prevent rapid on/off cycling. caution: if you operate too close to the thermal limits, the converter may shut down suddenly without warning. be sure to thoroughly test your application to avoid unplanned thermal shutdown. temperature derating curves the graphs in the next section illustrate typical operation under a variety of condi- tions. the derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced air? ow 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 air? ow as long as the average is not exceeded. note that the temperatures are of the ambient air? ow, not the converter itself which is obviously running at higher temperature than the outside air. also note that natural convection is de? ned as very ? ow rates which are not using fan-forced air? ow. depending on the application, natural convection is usually about 30-65 lfm but is not equal to still air (0 lfm). mps makes characterization measurements in a closed cycle wind tunnel with calibrated air? ow. we use both thermocouples and an infrared camera system to observe thermal performance. as a practical matter, it is quite dif? cult to insert an anemometer to precisely measure air? ow in most applications. sometimes it is possible to estimate the effective air? ow if you thoroughly understand the enclosure geometry, entry/exit ori? ce areas and the fan ? owrate speci? cations. if in doubt, contact mps to discuss placement and measurement techniques of suggested temperature sensors. caution: if you routinely or accidentally exceed these derating guidelines, the converter may have an unplanned over temperature shut down. also, these graphs are all collected at slightly above sea level altitude. be sure to reduce the derating for higher density altitude. output overvoltage protection this converter monitors its output voltage for an over-voltage condition using an on-board electronic comparator. the signal is optically coupled to the pri- mary 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 volt- age 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. it safely tests full current rated output voltage without damaging the converter. output fusing the converter is extensively protected against current, voltage and temperature extremes. however your output application circuit may need additional protection. in the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. consider using an appropriate fuse in series with the output. output current limiting as soon as the output current increases to approximately 125% to 150% of its maximum rated value, the dc/dc converter will enter a current-limiting mode. the output voltage will decrease proportionally with increases in output figure 3 C measuring output ripple and noise (pard) c1 c1 = 0.1f ceramic c2 = 10f low es load 2-3 inches (51-76mm) from module c2 r load 5 6 copper strip copper strip scope +output +sense 7 8 ?sense ?output the c bus and l bus components simulate a typical dc voltage bus. your speci? c system con? guration may require additional considerations. please note that the values of c in , l bus and c bus will vary according to the speci? c converter model. in critical applications, output ripple and noise (also referred to as periodic and random deviations or pard) may be reduced by adding ? lter elements such as multiple external capacitors. be sure to calculate component tem- perature rise from re? ected ac current dissipated inside capacitor esr. our application engineers can recommend potential solutions. in the ? gure, 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 ? xture. www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 8 of 13 current, thereby maintaining a somewhat constant power output. this is com- monly referred to as power limiting. current limiting inception is de? ned as the point at which full power falls below the rated tolerance. see the performance/functional speci? cations. note particularly that the output current may brie? y 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. 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 mag- netically 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 up to its appro- priate 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 tempera- tures. a short circuit can be tolerated inde? nitely. remote sense input sense inputs compensate for output voltage inaccuracy delivered at the load. this is done by correcting voltage drops along the output wiring such as mod- erate ir drops and the current carrying capacity of pc board etch. sense inputs also improve the stability of the converter and load system by optimizing the control loop phase margin. note: the sense input and power vout lines are internally connected through low value resistors to their respective polarities so that the converter can operate without external connection to the sense. nevertheless, if the sense function is not used for remote regulation, the user should connect +sense to +v out and Csense to Cv out at the converter pins. output overvoltage protection is monitored at the output voltage pin, not the sense pin. therefore excessive voltage differences between vout and sense together with trim adjustment of the output can cause the overvoltage protec- tion circuit to activate and shut down the output. power derating of the converter is based on the combination of maximum output current and the highest output voltage. therefore the designer must insure: (v out at pins) x (i out ) (max. rated output power) 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 speci? cations). in the trim equations and circuit diagrams that follow, trim adjustments use either a trimpot or a single ? xed resistor connected between the trim input and either the +sense or Csense terminals. (on some converters, an external user-supplied precision dc voltage may also be used for trimming). trimming resistors should have a low tempera- ture coef? cient (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 speci? ed output voltage accuracy. there are two cautions to be aware 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 the remote sense lines carry very little current. they are also capacitively coupled to the output lines and therefore are in the feedback control loop to regulate and stabilize the output. as such, they are not low impedance inputs and must be treated with care in pc board layouts. sense lines on the pcb should run adjacent to dc signals, preferably ground. in cables and discrete wiring, use twisted pair, shielded tubing or similar techniques. please observe sense inputs tolerance to avoid improper operation: [v out (+) Cv out (-)] C [ sense(+) C sense(-)] 10% of v out figure 4 C remote sense circuit con? guration load 6 8 9 5 7 contact and pcb resistance losses due to ir drops contact and pcb resistance losses due to ir drops +output +sense trim ? sense -output ? input on/off control +input 2 4 1 sense current i out sense return i out return figure 5 C trim adjustments using a trimpot load 6 8 7 5 9 5-22 turns 2 4 1 7 +output +sense trim ? sense ? output ? input on/off control +input figure 6 C trim adjustments to decrease output voltage using a fixed resistor load 6 8 9 5 r trim down 2 4 1 7 +output +sense trim ? sense ? output ? input on/off control +input www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 9 of 13 figure 7 C trim adjustments to increase output voltage using a fixed resistor 2 4 1 6 8 9 5 7 +output +sense trim ? sense ? output ? input on/off control +input load r trim up up v o C 5 r t ( ) = C 2050 12775 5 C v o r t ( ) = C 2050 5110 (vo - 2.5) down up v o C 12 r t ( ) = C 5110 25000 12 C v o r t ( ) = C 5110 10000 (vo-2.5) down up down uei-5/10-q12, -5/12-q48 uei-12/4.2-q12, -12/5-q48 up v o C 3.3 r t ( ) = C 2050 12775 3.3 C v o r t ( ) = C 2050 5110 (vo - 2.5) down uei-3.3/15-q12, -3.3/18-q48 v o C 15 r t ( ) = C 5110 25000 15 C v o r t ( ) = C 5110 10000 (vo-2.5) uei-15/3.3-q12, uei-15/4-q48 trim equations trim up trim down www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 10 of 13 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100 lfm natural convection 200 lfm output current (amps) ambient temperature ( c) uei-3.3/15-q12n maximum current temperature derating at sea level (v in = 24v, air flow is from pin 2 to pin 1) 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 output current (amps) ambient temperature ( c) 300 lfm 100 lfm natural convection 400 lfm uei-3.3/18-q48n maximum current temperature derating at sea level (v in = 48v air flow direction is transverse) 200 lfm efficiency (%) uei-3.3/18-q48 efficiency vs. line voltage and load current @ 25 o c load current (amps) 70 72 74 76 78 80 82 84 86 88 90 123456789101112131415161718 v in = 75v v in = 60v v in = 48v v in = 36v v in = 18v v in = 24v 1 2 3 4 5 6 7 8 9 101112131415 60 65 70 75 80 85 90 v in = 36v v in = 24v v in = 10v v in = 12v efficiency (%) uei-3.3/15-q12 efficiency vs. line voltage and load current @ 25 o c load current (amps) 30 40 50 60 70 80 90 100 12345678910 v in = 36v v in = 24v v in = 10v efficiency (%) uei-5-10-q12 efficiency vs. line voltage and load current @ 25 o c load current (amps) output current (amps) ambient temperature ( c) natural convection uei-5/10-q12n maximum current temperature derating at sea level (v in = 24v, airflow is from pin 2 to pin 1) 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 40 45 50 55 60 65 70 75 80 85 typical performance curves www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 11 of 13 123456789101112 72 74 76 78 80 82 84 86 88 90 92 v in = 36v v in = 18v v in = 24v v in = 60v v in = 75v v in = 48v efficiency (%) uei-5/12-q48 efficiency vs. line voltage and load current @ 25 o c load current (amps) 8.5 9 9.5 10 10.5 11 11.5 12 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100 lfm natural convection 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature ( c) uei-5/12-q48n maximum current temperature derating at sea level (v in = 48v, air flow is from pin 1 to pin 2) 60.0 62.5 65.0 67.5 70.0 72.5 75.0 77.5 80.0 82.5 85.0 87.5 90.0 92.5 0.31 0.69 1.13 1.48 1.87 2.25 2.64 3.01 3.42 3.81 4.20 v in = 36v v in = 9v v in = 24v efficiency (%) uei-12/4.2-q12 efficiency vs. line voltage and load current @ 25 o c load current (amps) 3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 40 45 50 55 60 65 70 75 80 85 90 100 lfm natural convection 200 lfm 300 lfm output current (amps) ambient temperature ( c) uei-12/4.2-q12 maximum current temperature derating at sea level (v in = 24v, airflow is from pin 1 to pin 2) typical performance curves 66 68 70 72 74 76 78 80 82 84 86 88 90 92 0.5 1 1.75 2.5 3 3.5 4 4.5 5 v in = 36v v in = 18v v in = 24v v in = 75v v in = 48v efficiency (%) uei-12/5-q48 efficiency vs. line voltage and load current @ 25 o c load current (amps) 2. 95 3. 2 3. 45 3. 7 3. 95 4. 2 4. 45 4. 7 4. 95 5. 2 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100 lfm natural convection 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature ( c) uei-12/5-q48 maximum current temperature derating at sea level (v in = 48v, air flow is from pin 2 to pin 1) www.murata-ps.com uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 12 of 13 0.82 1.06 1.32 1.57 1.82 2.07 2.32 2.57 2.82 3.07 3.3 2 77.0 79.5 82.0 84.5 87.0 89.5 92.0 v in = 12v v in = 9v v in = 36v v in = 24v efficiency (%) uei-15/3.3-q12 efficiency vs. line voltage and load current @ 25 o c load current (amps) 70 75 80 85 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 100 lfm natural convection 200 lfm 300 lfm output current (amps) ambient temperature ( c) uei-15/3.3-q12 maximum current temperature derating at sea level (v in = 12v, open frame, air flow is from pin 1 to pin 2) 70 75 80 85 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 100 lfm natural convection 200 lfm 300 lfm output current (amps) ambient temperature ( c) uei-15/3.3-q12 maximum current temperature derating at sea level (v in = 24v, open frame, air flow is from pin 1 to pin 2) typical performance curves 1.5 1.7 2.0 2.2 2.5 2.7 3.0 3.2 3.5 3.7 4.0 76 78 80 82 84 86 88 90 92 77 79 81 83 85 87 89 91 v in = 18v v in = 24v v in = 75v v in = 48v efficiency (%) uei-15/4-q48n-c efficiency vs. line voltage and load current @ 25 o c load current (amps) 25 30 35 40 45 50 55 60 65 70 75 80 85 2.0 2.5 3.0 3.5 4.0 100 lfm natural convection 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature ( c) uei-15/4-q48 maximum current temperature derating at sea level (v in = 24v, transverse airflow) 25 30 35 40 45 50 55 60 65 70 75 80 85 2.0 2.5 3.0 3.5 4.0 100 lfm natural convection 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature ( c) uei-15/4-q48 maximum current temperature derating at sea level (v in = 48v, transverse airflow) 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 her ein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to cha nge without notice. ? 2011 murata power solutions, inc. www.murata-ps.com/support murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered uei series 50-60w isolated wide-range dc/dc converters mdc_uei series 50-60w.c01 page 13 of 13 |
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