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uce series isolated, high-density, eighth-brick low pro? le dc/dc converters for full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com email: sales@murata-ps.com figure 1. simpli? ed block diagram 04 may 2010 mdc_uce.a27 page 1 of 16 features rohs-6 or rohs-5 compliant industry standard eighth-brick pinout and package outputs from 1.5v to 12v up to 120w low pro? le 0.4" height with 0.9" x 2.3" outline dimensions 36 to 75 vdc input range (48v nominal) fully isolated, 2250 vdc (basic) insulation outstanding thermal performance and derating extensive self-protection and short circuit features with no output reverse conduction on/off control, trim and sense functions interleaved synchronous recti? cation yields high ef? ciency over 90% fully protected against temperature and voltage limits certi? ed to ul/en/iec 60950-1 and can/csa c22.2 no. 60950-1, 2nd edition safety approvals units are offered with ? xed output voltages from 1.5 to 12 volts and currents up to 30 amps. uces operate over a wide temperature range (up to +85 degrees celsius at moderate air? ow) with full rated power. interleaved synchronous recti? er topology yields excellent ef? ciency over 90% and no reverse output conduction. uces achieve these impressive mechanical and environmental specs while delivering excellent electrical performance in a through-hole package. overall noise is typically 50 mv pk-pk (low voltage models) with fast step response. these converters offer tight output regulation and high stability even with no load. the unit is fully protected against input undervoltage, output overcurrent and short circuit. an on-board temperature sensor shuts down the converter if thermal limits are reached. hiccup output protection automatically restarts the converter when the fault is removed. a convenient remote on/off control input enables phased startup and shutdown in multi-voltage ap- plications. to compensate for longer wiring and to retain output voltage accuracy at the load, uces em- ploy a sense input to dynamically correct for ohmic losses. a trim input may be connected to a users adjustment potentiometer or trim resistors for output voltage calibration. the uce will tolerate substantial capacitive loading for bypass-cap applications. uces include industry-standard safety certi? ca- tions and basic i/o insulation provides input/output isolation to 2250v. radiation emission testing is performed to widely-accepted emc standards. product overview typical unit typical topology is shown. for ef? cient, fully isolated dc power in the smallest space, the uce open frame dc/dc converter series ? t in industry-standard eighth brick outline dimensions and mounting pins (on quarter-brick pinout). +v in (2) (8) (3) (1) (7) Cv in opto isolation reference & error amp pulse transformer input undervoltage, input overvoltage, and output overvoltage comparators remote on/off control +v out (4) ?v out (6) v out trim +sense (5) ?sense switch control pwm controller simplified block diagram $
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 04 may 2010 mdc_uce.a27 page 2 of 16 part number structure maximum rated output current in amps eighth-brick package output con? guration: u = unipolar/single nominal output voltage u ce - / d48 - 3.3 30 n b input voltage range: d48 = 36-75v, 48v nominal c - h performance specifications and ordering guide model family output input ef? ciency package v out (v) i out (a) power (w) ripple & noise (mvp-p) regulation (max.) v in nom. (v) range (v) i in, no load (ma) i in, full load (a) typ. max. line load min. typ. case pinout uce-1.2/25-d48 1.2 25 30 please contact murata power solutions for further information. uce-1.5/20-d48 1.5 20 30 50 100 0.15% 0.3% 48 36-75 50 0.72 85% 87% c56 p32 uce-1.5/40-d48 1.5 40 60 please contact murata power solutions for further information. uce-1.8/30-d48 1.8 30 54 30 80 0.125% 0.25% 48 36-75 45 1.28 87% 88% c56 p32 uce-2.5/20-d48 2.5 20 50 50 50 1.14 88% 91% uce-3.3/15-d48 3.3 15 49.5 100 60 1.15 86% 90% uce-3.3/30-d48 3.3 30 99 0.1% 0.2% 2.27 89% 91% uce-5/10-d48 51050 0.125% 0.25% 30 1.15 88% 90.5% uce-5/20-d48 5 20 100 30 60 50 2.25 90% 92.5% uce-12/4.2-d48 12 4.2 50.4 150 300 1.14 86% 92% uce-12/8.3-d48 12 8.3 99.6 200 2.31 90% uce-12/10-d48 12 10 120 2.78 please refer to the model number structure for additional ordering part numbers and options . conformal coating (optional) blank = no coating, standard h = coating added, optional, special quantity order rohs hazardous materials compliance c = rohs6 (does not claim eu rohs exemption 7bClead in solder), standard y = rohs5 (with lead), optional, special quantity order note: some model combinations may not be available. contact murata power solutions for availability. on/off control polarity n = negative polarity , standard p = positive polarity , optional baseplate (optional, not available on some models) blank = no baseplate , standard b = baseplate installed , optional, special quantity order lx ( through-hole packages only) blank = standard pin length 0.180 inches (4.6mm) l1 = pin length 0.110 inches (2.79mm)* l2 = pin length 0.145 inches (3.68mm)* * special quantity order is required. pin length option product adaptations murata power solutions offers several variations of our core product family. these products are available under scheduled quantity orders and may also include separate manufacturing documentation from a mutually agreeable product speci? cation. since these product adaptations largely share a common parts list and similar speci? cations and test methods with their root products, they are provided at excellent costs and delivery. please contact murata power solutions for details. as of this date, the following products are available: uce-3.3/30-d48nhl2-y uce-12/4.2-d48nhl2-y these models are all negative on/off polarity, no baseplate, conformal coating added, 3.68mm pin length, and rohs-5 hazardous substance compliance (with lead).
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 04 may 2010 mdc_uce.a27 page 3 of 16 input characteristics model family start-up threshold min. (a) under- voltage shut- down (v) reflected (back) ripple current (ma) internal input filter type reverse polarity protection remote on/off control inrush transient a 2 sec output short circuit (ma) low line (v in =min.) (a) standby mode (ma) current (ma) positive logic p model suffix negative logic n model suffix uce-1.5/20-d48 34 32 10-30, model dependent 0.05 a 2 sec 50-150, model dependent 0.97 1-10, model dependent l-c none, install external fuse 1.0 off=ground pin to +1v max. on=open or +3.5 to +15v max. off=open or +2.5v to +15v max. on=ground pin to +0.8v max. uce-1.8/30-d48 32.5 1.72 uce-2.5/20-d48 32 1.53 uce-3.3/15-d48 32 1.54 uce-3.3/30-d48 32 3.06 uce-5/10-d48 34.5 32 1.53 pi uce-5/20-d48 34 31.5 3.00 pi uce-12/4.2-d48 34 32 1.52 l-c uce-12/8.3-d48 3.07 uce-12/10-d48 500 3.70 output characteristics model family v out accuracy 50% load % of v nom capacitive loading max. low esr <0.02 max. f adjustment range temperature coef? cient minimum loading remote sense compen- sation ripple/ noise (20 mhz bandwidth) line/load regulation ef? ciency current limit inception 98% of vout, after warmup a uce-1.5/20-d48 1% 10,000 C10 to +10% of vnom. 0.02% of vout range per c no minimum load +10% see ordering guide 24.5 uce-1.8/30-d48 36 uce-2.5/20-d48 32 uce-3.3/15-d48 24 uce-3.3/30-d48 35 uce-5/10-d48 1000 15. uce-5/20-d48 10,000 23 min. uce-12/4.2-d48 1000 5.5 uce-12/8.3-d48 12 uce-12/10-d48 13 isolation characteristics model family input to output min. v input to baseplate min. v baseplate to output min. v isolation resistance m isolation capacitance pf isolation safety rating uce-1.5/20-d48 2250 1500 1500 100 1000 basic insulation uce-1.8/30-d48 10 uce-2.5/20-d48 100 uce-3.3/15-d48 uce-3.3/30-d48 uce-5/10-d48 uce-5/20-d48 uce-12/4.2-d48 uce-12/8.3-d48 uce-12/10-d48 specifications
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com input voltage: continuous: 48 volt input models 75 volts transient (100 msec. max.) 48 volt input models 100 volts on/off control +15 volts input reverse polarity protection none, install external fuse. output overvoltage protection magnetic feedback. see speci? cations. output current current-limited. devices can withstand sustained short circuit without damage. storage temperature C40 to +125c. lead temperature see soldering guidelines. 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 or recommended. absolute maximum ratings 04 may 2010 mdc_uce.a27 page 4 of 16 dynamic characteristics model family dynamic load response (50-75-50% load step) to 1% of ? nal value, sec (see note 1) start-up time switching frequency khz v in to v out regulated (max.) remote on/ off to v out regulated (max.) msec uce-1.5/20-d48 100 50 50 480 uce-1.8/30-d48 150 10 10 400 uce-2.5/20-d48 100 50 50 350 uce-3.3/15-d48 200 50 50 480 uce-3.3/30-d48 50 15 10 380 uce-5/10-d48 100 50 50 400 uce-5/20-d48 100 max. 10 10 330 uce-12/4.2-d48 30 60 60 200 uce-12/8.3-d48 50 50 50 uce-12/10-d48 50 60 60 specifications, continued miscellaneous characteristics model family calculated mtbf 4 operating temperature range with derating (c) operating pcb temperature (no derating) storage temperature range (c) thermal protection/ shutdown (oc) short circuit current (a) overvoltage protection 12 (v) via magnetic feedback (v) short circuit protection method short circuit duration 16 relative humidity (non-condensing) uce-1.5/20-d48 tbc ?40 to +85 ?40 to +110 (model dependent) ?55 to +125 120 5 1.95 current limiting, hiccup autorestart. remove overload for recovery. continuous, output shorted to ground. no damage. to +85c/85% uce-1.8/30-d48 2.8 v. max uce-2.5/20-d48 1.8 m hrs 3 uce-3.3/15-d48 2.4 m hrs 4.25 uce-3.3/30-d48 uce-5/10-d48 2.6 m hrs 110 0.5 7 max. uce-5/20-d48 2.7 m hrs uce-12/4.2-d48 tbc 125 5 14.5 uce-12/8.3-d48 2.4 m hrs uce-12/10-d48
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 04 may 2010 mdc_uce.a27 page 5 of 16 physical characteristics outline dimensions see mechanical specs (below) pin material copper alloy pin diameter 0.04/0.062" (1.016/1.524mm) pin ? nish nickel underplate with gold overplate weight uce-1.5/20-d48 0.67 ounces (19 grams) uce-1.8/30-d48, 0.71 ounces (20 grams) uce-2.5/20-d48 uce-5/10-d48 uce-5/20-d48 uce-12/4.2-d48 uce-3.3/15-d48 1 ounce (28 grams) uce-3.3/30-d48, uce-12/8.3-d48 0.81 ounces (23 grams) electromagnetic interference (external ? lter required) meets en55022/cispr22 (requires external ? lter) safety certi? ed to ul/cul 60950-1, csa-c22.2 no. 60950-1, iec/en 60950-1, 2nd edition specifications, continued 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? cations may cause damage to the product. your production environment may differ; therefore please thorou ghly review these guidelines with your process engineers. wave solder operations for through-hole mounted products (thmt) for sn/ag/cu based solders: maximum preheat temperature 115oc. maximum pot temperature 270oc. maximum solder dwell time 7 seconds for sn/pb based solders: maximum preheat temperature 105oc. maximum pot temperature 250oc. maximum solder dwell time 6 seconds soldering guidelines (1) all models are tested and speci? ed with external 1||10 f ceramic/tantalum output capaci- tors and no 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. general conditions for speci? cations are +25 deg.c, v in = nominal, v out = nominal, full load. adequate air? ow must be supplied for extended testing under power. (2) input ripple current is tested and speci? ed over a 5 hz to 20 mhz bandwidth. input ? ltering is c in = 33 f, 100v tantalum, c bus = 220 f, 100v electrolytic, l bus = 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 output load, natural air convection. (5) the on/off control is normally controlled by a switch. but it may also be driven with exter- nal logic or by applying appropriate external voltages which are referenced to input common. the on/off control input should use either an open collector or open drain transistor. (6) short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. (7) the outputs are not intended to sink appreciable reverse current. this may damage the outputs. (8) output noise may be further reduced by adding an external ? lter. see i/o filtering and noise reduction. (9) all models are fully operational and meet published speci? cations, including cold start at C40oc. (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) alternate pin length and/or other output voltages are available under special quantity order. (12) output overvoltage is non-latching. when the overvoltage fault is removed, the converter will immediately recover. (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, a body diode will become forward bi- ased and will conduct considerable current. to ensure reverse input protection with full output load, always connect an external input fuse in series with the +v in input. performance specification notes
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com mechanical specifications 04 may 2010 mdc_uce.a27 page 6 of 16 input/output connections pin function p32 1 negative input 2 on/off control 3 positive input 4 negative output 5 negative sense 6 output trim 7 positive sense 8 positive output 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? please note that some competitive units may use different pin numbering or alternate outline views. however, all units are plug-compatible. bottom view standard pin length is shown. please refer to the part number structure for special order pin lengths. 2.30 (58.4) 2.00 (50.8) 0.37 max (9.4) 0.18 (4.6) 0.300 (7.62) 0.300 (7.62) 0.15 (3.81) 0.900 (22.9) 0.015 minimum clearance between standoffs and highest component pins 1-3, 5-7: 0.0400.001 (1.0160.025) dia. pins 4, 8: 0.0620.001 (1.5750.025) dia. 1 2 3 4 pin 8 open frame without baseplate
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 04 may 2010 mdc_uce.a27 page 7 of 16 mechanical specifications bottom view 0.300 (7.62) 0.300 (7.62) 0.15 (3.81) 0.900 (22.9) screw length must not go through baseplate. pins 1-3, 5-7: 0.0400.001 (1.0160.025) dia. pins 4, 8: 0.0620.001 (1.5750.025) dia. 1 2 3 4 pin 8 0.015 minimum clearance between standoffs and highest component with baseplate 0.50 (12.7) 0.600 (15.24) 0.900 (22.9) 2.00 (50.8) 2.00 (50.8) 2.30 (58.4) 0.18 (4.6) m3 threaded insert 2 places, see notes 1&2 1. m3 screw used to bolt unit's baseplate to other surfaces (such as heatsink) must not exceed 0.118'' (3mm) depth below the surface of baseplate 2. applied torque per screw should not exceed 5.3 in-lb (0.6 nm) input/output connections pin function p32 1 negative input 2 on/off control 3 positive input 4 negative output 5 negative sense 6 output trim 7 positive sense 8 positive output 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? please note that some competitive units may use different pin numbering or alternate outline views. however, all units are plug-compatible. standard pin length is shown. please refer to the part number struc- ture for special order pin lengths. if not wired to an external load, the sense inputs must be con- nected to their respective vout pins at the converter.
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 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 with a value which is approximately twice the maximum line current, calculated 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 body 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. please be sure to install a properly- rated external input fuse . 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 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 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 start-up time (see speci? cations) 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 speci? ed regulation band. actual measured times will vary with input source impedance, external input capacitance, input voltage 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 the pwm controller at power up, thereby limiting the input inrush current. 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 speci? ed regulation band. the speci? cation assumes that the output is fully loaded at maximum rated current. application notes 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 (cin 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, the cbus and lbus components simulate a typical dc voltage bus. your speci? c system con? guration may require additional considerations. please note that the values of cin, lbus and cbus 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 tempera- ture rise from re? ected ac current dissipated inside capacitor esr. in ? gure 3, the two copper strips simulate real-world printed circuit imped- ances 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. figure 2. measuring input ripple current c in v in c bus l bus c in = 33f, esr < 700m @ 100khz c bus = 220f, esr < 100m @ 100khz l bus = 12h 4 1 +input ?input current probe to oscilloscope + C + C 04 may 2010 mdc_uce.a27 page 8 of 16
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 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 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 protect against thermal overstress, these converters include thermal shut- down circuitry. if environmental conditions cause the temperature of the dc/ dcs to rise above the operating temperature range up to the shutdown tem- perature, 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. the temperature sensor is typically located adjacent to the switching controller, approximately in the center of the unit. see the perfor- mance and functional speci? cations. caution: if you operate too close to the thermal limits, the converter may shut down suddenly without warning. be sure to thoroughly test your applica- tion to avoid unplanned thermal shutdown. 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 air? ow measured in linear feet per minute (lfm). note that these are average measurements. the converter will accept brief increases in 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 very low ? ow rates (below about 25 lfm) are similar to natural convection, that is, not using fan-forced air? ow. murata power solutions 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. 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. 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 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 appropriate external protection. 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 current, thereby maintaining a somewhat constant power output. this is also commonly 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 in normal operation as long as the average output power is not exceeded. 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 (approxi- mately 98% of nominal output voltage for most models), the magnetically coupled voltage used to develop the 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. figure 3. measuring output ripple and noise (pard) c1 c1 = 0.1f ceramic c2 = 10f tantalum load 2-3 inches (51-76mm) from module c2 r load 6 5 copper strip copper strip scope +output +sense 9 8 ?sense ?output 04 may 2010 mdc_uce.a27 page 9 of 16
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com if the short-circuit condition persists, another shutdown cycle will initiate. this rapid on/off cycling is called hiccup mode. the hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures and/or component damage. the hiccup system differs from older latching short circuit systems because you do not have to power down the converter to make it restart. the system will automatically restore operation as soon as the short circuit condi- tion is removed. remote sense input use the sense inputs with caution. sense is normally connected at the load . sense inputs compensate for output voltage inaccuracy delivered at the load. this is done by correcting ir voltage drops along the output wiring and the current carrying capacity of pc board etch. this output drop (the difference between sense and vout when measured at the converter) should not exceed 0.5v. consider using heavier wire if this drop is excessive. 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 +vout and Csense to Cvout at the converter pins. 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. any long, distributed wiring and/or signi? cant inductance introduced into the sense control loop can adversely affect overall system stability. if in doubt, test your applications by observing the converters output transient response during step loads. there should not be any appreciable ringing or oscillation. you may also adjust the output trim slightly to compensate for voltage loss in any external ? lter elements. do not exceed maximum power ratings. please observe sense inputs tolerance to avoid improper operation: [vout(+) ?vout(-)] ? [sense(+) ?sense(-)] 10% of vout 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: (vout at pins) x (iout) (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 equa- tions 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 temperature 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 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. caution: be careful of external electrical noise. the trim input is a senstive input to the converters feedback control loop. excessive electrical noise may cause instability or oscillation. keep external connections short to the trim input. use shielding if needed. figure 4. remote sense circuit con? guration load 5 8 7 6 9 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 1 3 4 sense current i out sense return i out return 04 may 2010 mdc_uce.a27 page 10 of 16
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 04 may 2010 mdc_uce.a27 page 11 of 16 where, = | ( v nom ? v out ) / v nom | v nom is the nominal, untrimmed output voltage. v out is the desired new output voltage. do not exceed the speci?ed trim range or maximum power ratings when adjusting trim. use 1% precision resistors mounted close to the converter on short leads. trim down connect trim resistor between trim pin and ?sense 5.11 r trimdn (k ) = ? 10.22 trim up connect trim resistor between trim pin and +sense 1.225 5.11 v nom (1+ ) r trimup (k ) = ? 10.22 ? 5.11 figure 5. trim connections using a trimpot figure 8. trim connections to decrease output voltages figure 6. trim connections to increase output voltages load +output Cinput +input on/off control trim +sense Coutput Csense load r trim down +output Cinput +input on/off control trim +sense Coutput Csense load r trim up +output Cinput +input on/off control trim +sense Coutput Csense trim equations trim circuits figure 7. driving the on/off control pin (suggested circuit) 1 3 on/off control -input +vcc connect sense to its respective v out pin if sense is not used with a remote load.
uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com figure 9. on/off enable control ground bounce protection preferred location of on/off control adjacent to -vin terminal dc/dc converter install separate return wire for on/off control with remote transistor on/off control transistor do not connect control transistor through remote power bus ground plane or power return bus + vin on/off enable -vin return 04 may 2010 mdc_uce.a27 page 12 of 16 remote on/off control on the input side, a remote on/off control can be speci? ed with either positive or negative logic polarity. 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 Cvin. an internal bias current causes the open pin to rise to approximately +15v. some models will also turn on at lower intermediate voltages (see speci? cations). positive-polarity devices are disabled when the on/off is grounded or brought to within a low voltage (see speci? cations) with respect to Cvin. negative: models with negative polarity are on (enabled) when the on/off is grounded or brought to within a low voltage (see speci? cations) with respect to Cvin. the device is off (disabled) when the on/off is left open or is pulled high to approximately +15v with respect to Cvin. dynamic control of the on/off function should be able to sink the speci- ? ed signal current when brought low and withstand appropriate voltage when brought high. be aware too that there is a ? nite time in milliseconds (see speci? cations) 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. 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 Cvin 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 Cvin 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. 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, a switch or a relay (which can thereupon be controlled by logic) returned to negative vin. caution: do not apply voltages to the on/off pin when there is no input power voltage. otherwise the converter may be permanently damaged. output capacitive load these converters do not require external capacitance added to achieve rated speci? cations. users should only consider adding capacitance to reduce switch- ing noise and/or to handle spike current step loads. install only enough capaci- tance to achieve noise objectives. excess external capacitance may cause regulation problems, slower transient response and possible instability. proper wiring of the sense inputs will improve these factors under capacitive load. the maximum rated output capacitance and esr speci? cation is given for a capacitor installed immediately adjacent to the converter. any extended output wiring or smaller wire gauge or less ground plane may tolerate somewhat higher capacitance. also, capacitors with higher esr may use a larger capacitance.
typical performance curves uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 40 45 50 55 60 65 70 75 80 85 90 95 3 5 7 9 11 13 15 17 19 21 23 25 27 29 load current (a) ef?ciency (%) vin = 75v vin = 48v vin = 36v 0 5 10 15 20 25 30 35 30 35 40 45 50 55 60 65 70 75 80 ambient temperature (oc) output current (a) 300 lfm 100 lfm 200 lfm 400 lfm 10 12 14 16 18 20 30 40 50 60 70 80 ambient temperature (oc) output current (a) 200 lfm natural convection 100 lfm 300 lfm 70 75 80 85 90 95 34567891011121314151617181920 load current (a) ef?ciency (%) vin = 75v vin = 48v vin = 36v 30 35 40 45 50 55 60 65 70 75 80 85 0 4 8 12 16 20 output current (a) ambient temperature (oc) 300 lfm 100 lfm 200 lfm 400 lfm 60 65 70 75 80 85 90 3 6 9 12 15 18 vin = 75v vin = 48v vin = 36v load current (a) ef?ciency (%) uce-1.5/20-d48 maximum current temperature derating (vin = 48v, no baseplate, longitudinal air? ow at sea level) uce-1.8/30-d48 maximum current temperature derating (vin = 48v, no baseplate, longitudinal air? ow at sea level) uce-2.5/20-d48 maximum current temperature derating (vin = 48v, with baseplate, longitudinal air? ow at sea level) uce-1.5/20-d48 ef? ciency vs line voltage & load current @ 25oc uce-1.8/30-d48 ef? ciency vs line voltage & load current @ 25oc uce-2.5/20-d48 ef? ciency vs line voltage & load current @ 25oc 04 may 2010 mdc_uce.a27 page 13 of 16
typical performance curves uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 15 12 9 6 3 0 30 35 40 45 50 55 60 65 70 75 80 85 output current (a) ambient temperature (oc) 300 lfm 100 lfm 200 lfm 400 lfm 70 75 80 85 90 95 3 4 5 6 7 8 9 10 11 12 13 14 15 load current (a) ef?ciency (%) vin = 75v vin = 48v vin = 36v 40 45 50 55 60 65 70 75 80 85 90 95 3 4 5 6 7 8 9 101112131415161718192021222324252627282930 0 2 4 6 8 10 12 14 16 18 20 22 loss (watts) load current (a) ef?ciency (%) vin = 75v vin = 48v power dissipation vin = 48v vin = 36v 0 5 10 15 20 25 30 35 30 40 50 60 70 80 0 lfm ambient temperature (oc) output current (a) 300 lfm 100 lfm 200 lfm 400 lfm 100 lfm 0 5 10 15 20 25 30 35 30 40 50 60 70 80 0 lfm ambient temperature (oc) output current (a) 300 lfm 100 lfm 200 lfm 400 lfm 100 lfm uce-3.3/15-d48 maximum current temperature derating (vin = 48v, no baseplate, longitudinal air? ow at sea level) uce-3.3/30-d48 maximum current temperature derating (vin=48v, no baseplate, transverse air? ow at sea level) uce-3.3/15-d48 ef? ciency vs. line voltage & load current @ +25oc uce-3.3/30-d48 ef? ciency vs line voltage & load current @ 25oc uce-3.3/30-d48 maximum current temperature derating (vin=48v, no baseplate, longitudinal air? ow at sea level) 04 may 2010 mdc_uce.a27 page 14 of 16
typical performance curves uce series isolated, high-density, eighth-brick low pro? le dc/dc converters www.murata-ps.com email: sales@murata-ps.com 30 35 40 45 50 55 60 65 70 75 80 85 4 5 6 7 8 9 10 11 natural convection ambient temperature (oc) output current (a) 200 lfm 400 lfm 300 lfm 100 lfm 30 35 40 45 50 55 60 65 70 75 80 85 0 5 10 15 20 25 natural convection ambient temperature (oc) output current (a) 200 lfm 400 lfm 300 lfm 100 lfm 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 100 12345678910 0 0.5 1 1.5 2 2.5 3 3.5 power dissipation (watts) load current (a) ef?ciency (%) vin = 75v vin = 48v vin = 36v power dissipation (vin = 48v) 80 82 84 86 88 90 92 94 96 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 0 2 4 6 8 10 12 14 16 load current (a) ef?ciency (%) vin = 75v vin = 48v vin = 36v power dissipation (vin = 48v) power dissipation (watts) 3 3.25 3.5 3.75 4 4.25 30 40 50 60 70 80 ambient temperature (oc) output current (a) 100 lfm 200 to 400 lfm 60 65 70 75 80 85 90 95 0.6 1.2 1.8 2.4 3.0 3.6 4.2 load current (a) ef?ciency (%) vin = 75v vin = 48v vin = 36v uce-5/10-d48 maximum current temperature derating at sea level (vin = 48v, transverse air? ow, no baseplate) uce-5/20-d48 maximum current temperature derating at sea level (vin = 48v, transverse air? ow, no baseplate) uce-12/4.2-d48 maximum current temperature derating (vin = 48v, no baseplate, longitudinal air? ow at sea level) uce-5/10-d48 ef? ciency vs. line voltage & load current @ +25oc uce-5/20-d48 ef? ciency ef? ciency and power dissipation @ ta = +25oc uce-12/4.2-d48 ef? ciency vs. line voltage & load current @ +25oc 04 may 2010 mdc_uce.a27 page 15 of 16
typical performance curves uce series isolated, high-density, eighth-brick low pro? le dc/dc converters 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. ? 2010 murata power solutions, inc. www.murata-ps.com/locations email: sales@murata-ps.com murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered 0 1 2 3 4 5 6 7 8 9 30 35 40 45 50 55 60 65 70 75 80 85 300 lfm 100 lfm 200 lfm 400 lfm ambient temperature (oc) output current (a) 0 1 2 3 4 5 6 7 8 9 30 35 40 45 50 55 60 65 70 75 80 85 300 lfm 100 lfm 200 lfm 400 lfm ambient temperature (oc) output current (a) 70 75 80 85 90 95 345678 load current (a) ef?ciency (%) vin = 75v vin = 48v vin = 36v uce-12/8.3-d48 maximum current temperature derating (vin = 48v, no baseplate, longitudinal air? ow at sea level) uce-12/10-d48 maximum current temperature derating at sea level (vin = 48v, no baseplate, air? ow direction from vin to vout) uce-12/8.3-d48 ef? ciency vs line voltage & load current @ 25oc uce-12/8.3-d48 maximum current temperature derating at sea level (vin = 48v, with baseplate, air? ow is from -vin to +vin) uce-12/10-d48 ef? ciency and power dissipation @ ta = +25oc 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 natural convection ambient temperature (oc) output current (a) 200 lfm 400 lfm 300 lfm 100 lfm 40 45 50 55 60 65 70 75 80 85 90 95 100 345678910 0 4 8 12 16 20 24 28 load current (a) ef?ciency (%) vin = 75v vin = 48v vin = 36v power dissipation (vin = 48v) power dissipation (watts) 04 may 2010 mdc_uce.a27 page 16 of 16

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