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$ Cv in (1) +v in (3) opto isolation pwm controller reference & error amp input undervoltage, input overvoltage, and output overvoltage comparators * can be ordered with positive (standard) or negative (optional) polarity. remote on/off control* (2) +sense (7) Csense (5) +v out (8) v out trim (6) Cv out (4) switch control figure 1. simpli? ed schematic contents page description, photograph, connection diagram 1 ordering guide, model numbering 2 mechanical specs, input/output pinout 3 detailed electrical speci? cations 4 soldering guidelines 14 performance data 16 for applications requiring improved electrical and thermal performance at reduced cost, consider datels new ucq series quarter brick dc/dc power converters. these compact units measure just 1.45" x 2.3" x 0.4" (36.8 x 60.9 x 10.2 mm) and ? t the industry-standard footprint. available outputs range between 1.2v @ 30 amps to 15v @ 6.7 amps and accept a wide input range. the ucqs interleaved, synchronous-recti? er topology offers high ef? ciency (up to 93%), tight line and load regulation, low noise and fast step response. a single-board optimized open-frame design contributes to impressive thermal opera- tion. ucqs will operate up to +70c and 100 lfm air? ow with no derating. the ucqs feature full isolation to 2250vdc meeting basic insulation requirements of ul/en/iec 60950-1. input ? lters reduce propa- gated switching noise back to input sources. also included is a remote on/off switch control (with positive or negative polarity), output trim adjustable over nominal and output sense functions to reduce power lead losses. extensive protection items avoid damage from out of limit voltages, currents and temperatures. protection faults automatically recover using the hiccup technique. besides safety testing to 60950-1, certi? cations for the ucq in- clude application for emc compliance (to en55022/ cispr22 with ? lter), quali? cation testing. features standard quarter-brick package/pinout low cost; low pro? le, 0.4" (10.2mm) 24v or 48v nominal input outputs: 1.2v to 15v interleaved synchronous-recti? er topology ? ultra high ef? ciency ? 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 designed to meet ul/en/iec60950-1 safety approvals product overview typical topology may vary between units. typical units single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated 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 01 apr 2010 mdc_ucq models.b17 page 1 of 23
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. figure 2. 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 ? please refer to the part number structure for additional ordering part numbers and options. ? all speci? cations are at nominal line voltage and full load, +25 deg.c unless otherwise noted. see detailed speci? cations. o utput capacitors are 1 f ceramic || 10 f electrolytic. i/o caps are necessary for our test equipment and may not be needed for your application. outline dimensions: 2.3 1.45 0.40 inches 58.4 36.8 10.2 mm pinout: p32 (all models) performance speci? cations and ordering guide ? ordering guide root models ? output input ef? ciency v out (volts) i out (amps) power (watts) r/n (mvp-p) regulation (max.) ? v in nom. (volts) range (volts) i in no load (ma) i in full load (amps) typ. max. line load min. typ. ucq-1.2/40-d24p-c 1.2 40 48 please contact murata power solutions for further information. ucq-1.2/30-d48n-c 1.2 30 36 50 100 0.125% 0.25% 48 36-75 30 0.90 81% 83% ucq-1.5/25-d48n-c 1.5 25 37.5 50 80 0.125% 0.25% 48 36-75 50 0.94 81% 83% ucq-1.5/40-d48n-c 1.5 40 60 50 100 0.125% 0.25% 48 36-75 50 1.45 85% 86% ucq-1.8/30-d48n-c 1.8 30 54 80 100 0.125% 0.25% 48 36-75 45 1.31 83% 86% ucq-1.8/40-d48n-c 1.8 40 72 50 100 0.1% 0.2% 48 36-75 30 1.70 86% 88% ucq-2.5/40-d24p-c 2.5 40 100 80 120 0.125% 0.25% 24 18-36 120 4.96 82% 84% ucq-2.5/30-d48n-c 2.5 30 75 50 100 0.125% 0.25% 48 36-75 50 1.80 85% 87% ucq-3.3/35-d24p-c 3.3 35 115.5 80 120 0.25% 0.25% 24 18-36 130 5.41 87% 89% ucq-3.3/20-d48n-c 3.3 20 66 50 80 0.125% 0.25% 48 36-75 50 1.53 88.5% 90% ucq-3.3/30-d48n-c 3.3 30 99 50 80 0.125% 0.25% 48 36-75 50 2.3 89.5% 91% ucq-3.3/40-d48n-c 3.3 40 132 60 100 0.1% 0.2% 48 36-75 30 3.06 89% 90% ucq-5/20-d24p-c 5 20 100 50 60 0.125% 0.25% 24 18-36 160 4.55 88% 91.5% ucq-5/20-d48n-c 5 20 100 35 55 0.125% 0.25% 48 36-75 80 2.26 89% 92% ucq-5/25-d48n-c 5 25 125 50 100 0.125% 0.25% 48 36-75 30 2.89 88% 90% ucq-12/8.3-d48n-c 12 8.3 99.6 100 150 0.125% 0.25% 48 36-75 80 2.28 90% 91% ucq-15/6.7-d48n-c 15 6.7 100.5 100 150 0.125% 0.25% 48 36-75 100 2.28 90% 92% single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 2 of 23
pin length option blank = standard pin length 0.180 in. (4.6 mm) l1 = 0.110 in. (2.79 mm)* l2 = 0.145 in. (3.68 mm)* *special quantity order required nominal output voltage 3.3 cq 30 - / d48 input voltage range: d24 = 18-36 volts (24v nominal) d48 = 36-75 volts (48v nominal) maximum rated output : current in amps output con? guration: unipolar, single output - n u quarter-brick package b conformal coating (optional) blank = no coating, standard h = coating added, optional special order 0.300 (7.6) 1.45 (36.8) 0.600 (15.24) 4 eq. sp. 0.600 (15.2) 2.00 (50.8) a b b b a 2.30 (58.4) 0.015 minimum clearance between standoffs and highest component 0.40 (10.2) 0.18 (4.6) bottom view pins 1-3, 5-7: 0.040? 0.002 (1.016 0.05) pins 4, 8: 0.062? 0.002 (1.575 0.05) 1 2 3 8 7 6 5 4 case c67 ucq with optional baseplate - rohs hazardous materials compliance c = rohs-6, standard (does not claim eu rohs exemption 7bClead in solder) y = rohs-5 (with lead), optional, special order c i/o connections pin function p32 pin function p32 1 ?input 5 ?sense 2 remote on/off 6 output trim 3 +input 7 +sense 4 ?output 8 +output part number structure mechanical specifications h on/off control polarity p = positive polarity (standard for d24, optional for d48) n = negative polarity (standard for d48, optional for d24) baseplate (optional) blank = no baseplate , standard b = baseplate installed , optional special order component locations may vary between units. standard pin length is shown. please refer to the part number structure for special order pin lengths. 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? 1.03 (26.2) a b 1.45 (36.8) b a 2.30 (58.4) 1.860 (47.2) #m3 thd. x 0.15 deep typical 4 pl. screw length must not go through baseplate 0.50 (12.7) 0.18 (4.6) pins 1-3, 5-7: 0.040? 0.002 (1.016 0.05) pins 4, 8: 0.062? 0.002 (1.575 0.05) note: some model combinations may not be available. contact murata power solutions for availability. lx single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 3 of 23
ucq-1.2/30-d48 ucq-1.5/25-d48 ucq-1.5/40-d48 ucq-1.8/30-d48 ucq-1.8/40-d48 input input voltage range see ordering guide. start-up threshold, volts 34 34 34 34 34 undervoltage shutdown, v 33 32 32.5 32.5 32 overvoltage shutdown none re? ected (back) ripple current, ma pk-pk 10-30, model dependent input current full load conditions see ordering guide. inrush transient, a 2 sec 0.05 output short circuit, ma 50-200, model dependent low line (v in = min.), amps 1.23 1.26 1.96 1.74 2.30 standby mode, ma (off, uv, ot shutdown) 1-10, model dependent internal input ? lter type pi-type l-c pi-type pi-type pi-type reverse polarity protection none, install external fuse. remote on/off control positive logic (p model suf? x) off = ground pin to +0.8v on = open or +3.5 to +13.5v max negative logic (n model suf? x) off = open or +3.5 to +13.5v on = ground pin to +0.8v max current, ma 1 output voltage output range see ordering guide. voltage output accuracy 1% of v nom ., (50% load) adjustment range, % of v nom . 10% ?20 + 10 10% 10% 10% temperature coef? cient 0.02% of v out range per c minimum loading no minimum loading. remote sense compensation +10% ripple/noise (20 mhz bandwidth) see ordering guide. line/load regulation see ordering guide. ef? ciency see ordering guide. maximum capacitive loading, f low esr <0.02 max., resistive load 1,000 10,000 10,000 4,700 10,000 performance speci? cations and ordering guide ? ? specs are typical unless noted. single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 4 of 23
? specs are typical unless noted. performance speci? cations and ordering guide ? ucq-2.5/40-d24 ucq-2.5/30-d48 ucq-3.3/35-d24 ucq-3.3/20-d48 ucq-3.3/30-d48 input input voltage range see ordering guide. start-up threshold, volts 16.8 34 17 35 35 undervoltage shutdown, v 15 32 15 34 34 overvoltage shutdown none re? ected (back) ripple current, ma pk-pk 10-30, model dependent input current full load conditions see ordering guide. inrush transient, a 2 sec 0.05 output short circuit, ma 50-200, model dependent low line (v in = min.), amps 6.69 2.39 7.21 2.04 3.02 standby mode, ma (off, uv, ot shutdown) 1-10, model dependent internal input ? lter type pi l-c l-c pi pi reverse polarity protection none, install external fuse. remote on/off control positive logic (p model suf? x) off = ground pin to +0.8v on = open or +3.5 to +13.5v max negative logic (n model suf? x) off = open or +3.5 to +13.5v on = ground pin to +0.8v max current, ma 1 output voltage output range see ordering guide. voltage output accuracy 1% of v nom ., (50% load) adjustment range, % of v nom . ?20 + 10 ?20 + 10 10% ?10 to + 10% temperature coef? cient 0.02% of v out range per c minimum loading no minimum loading. remote sense compensation +10% ripple/noise (20 mhz bandwidth) see ordering guide. line/load regulation see ordering guide. ef? ciency see ordering guide. maximum capacitive loading, f low esr <0.02 max., resistive load 10,000 10,000 10,000 10,000 10,000 single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 5 of 23
ucq-3.3/40-d48 ucq-5/20-d24 ucq-5/20-d48 ucq-5/25-d48 ucq-12/8.3-d48 ucq-15/6.7-d48n-c input input voltage range see ordering guide start-up threshold, volts 33 17 35 35 35 34 undervoltage shutdown, v 31.5 16 34 34 34 31.5 overvoltage shutdown none re? ected (back) ripple current, ma pk-pk 10-30, model dependent. 60 max. input current full load conditions see ordering guide. inrush transient, a 2 sec 0.1 0.05 0.03 output short circuit, ma 1200 50-200, model dependent 120 low line (v in = min.), amps 4.12 6.04 3.02 3.82 3.04 3.03 standby mode, ma (off, uv, ot shutdown) 1-10, model dependent internal input ? lter type pi l-c l-c l-c l-c pi reverse polarity protection none, install external fuse. remote on/off control positive logic (p model suf? x) off = ground pin to +0.8v on = open or +3.5 to +13.5v max off = ground pin or to +1v. on = open or +2.5 to +13.5v negative logic (n model suf? x) off = open or +3.5 to +13.5v on = ground pin to +0.8v max off = open or +2.5 to +13.5v on = ground pin or to +1v. current, ma 1 output voltage output range see ordering guide. voltage output accuracy 1% of v nom ., (50% load) adjustment range, % of v nom . ?10 to + 10% temperature coef? cient 0.02% of v out range per c. minimum loading no minimum loading. remote sense compensation +10% ripple/noise (20 mhz bandwidth) see ordering guide. line/load regulation see ordering guide. ef? ciency see ordering guide. maximum capacitive loading, f low esr <0.02 max., resistive load 10,000 10,000 10,000 10,000 1,000 1000 ? specs are typical unless noted. performance speci? cations and ordering guide ? single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 6 of 23
ucq-1.2/30-d48 ucq-1.5/25-d48 ucq-1.5/40-d48 ucq-1.8/30-d48 ucq-1.8/40-d48 isolation voltage input to output, volts min. 2250 input to baseplate, volts min. 1500 baseplate to output, volts min. 1500 isolation resistance, m 10-100, model dependent isolation capacitance, pf 1000 isolation safety rating basic insulation miscellaneous current limit inception (98% of v out , after warmup), amps 35 35 49 35 49 short circuit protection method current limiting, hiccup autorestart. remove overload for recovery. short circuit current, amps 5 short circuit duration continuous, output shorted to ground. no damage. overvoltage protection, volts (via magnetic feedback) 1.8 1.8 1.95 2.7 v max 2.2 dynamic characteristics dynamic load response (50-75-50% load step) 200 sec to 1% of ? nal value 200 sec to 1% of ? nal value 50 sec to 1% of ? nal value 100 sec to 1% of ? nal value 50 sec to 1% of ? nal value start-up time v in to v out regulated, msec 10 max. remote on/off to v out regulated, msec 10 max. switching frequency, khz 350 20 440 40 400 40 400 380 40 environmental calculated mtbf 2m hours 2.1m hours 2.2m hours 2m hours 2.1m hours operating temperature range, c see derating curves. ?40 to +85, with derating operating case temperature, c (no derating) ?40 to +120, model dependent storage temperature range, c ?55 to +125 thermal protection/ shutdown, c 110-125, model dependent relative humidity to +85c/85%, non-condensing performance speci? cations and ordering guide ? ? specs are typical unless noted. single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 7 of 23
ucq-2.5/40-d24 ucq-2.5/30-d48 ucq-3.3/35-d24 ucq-3.3/20-d48 ucq-3.3/30-d48 isolation voltage input to output, volts min. 2250 input to baseplate, volts min. 1500 baseplate to output, volts min. 1500 isolation resistance, m 10-100, model dependent isolation capacitance, pf 1000 isolation safety rating basic insulation miscellaneous current limit inception (98% of v out , after warmup), amps 46 37 41 24 35 short circuit protection method current limiting, hiccup autorestart. remove overload for recovery. short circuit current, amps 5125 short circuit duration continuous, output shorted to ground. no damage. overvoltage protection, volts (via magnetic feedback) 2.95 2.95 4 4.6 4 dynamic characteristics dynamic load response (50-75-50% load step) 200 sec to 1% of ? nal value 200 sec to 1% of ? nal value 200 sec to 1% of ? nal value 200 sec to 1.5% of ? nal value 200 sec to 1% of ? nal value start-up time v in to v out regulated, msec 10 max. remote on/off to v out regulated, msec 10 max. switching frequency, khz 480 480 30 350 10 330 40 330 40 environmental calculated mtbf 2.1m hours 2.2m hours 1.7m hours 1.8m hours 1.7m hours operating temperature range, c see derating curves. ?40 to +85, with derating operating case temperature, c (no derating) ?40 to +120, model dependent storage temperature range, c ?55 to +125 thermal protection/ shutdown, c 110-125, model dependent relative humidity to +85c/85%, non-condensing performance speci? cations and ordering guide ? ? specs are typical unless noted. single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 8 of 23
ucq-3.3/40-d48 ucq-5/20-d24 ucq-5/20-d48 ucq-5/25-d48 ucq-12/8.3-d48 ucq-15/6.7-d48n-c isolation voltage input to output, volts min. 2250 input to baseplate, volts min. 1500 baseplate to output, volts min. 1500 isolation resistance, m 10-100, model dependent isolation capacitance, pf 1000 isolation safety rating basic insulation miscellaneous current limit inception (98% of v out , after warmup), amps 49 26 22 27 10 9 short circuit protection method current limiting, hiccup autorestart. remove overload for recovery. short circuit current, amps 15 5 5 5 tbd 2 short circuit duration continuous, output shorted to ground. no damage. overvoltage protection, volts (via magnetic feedback) 4.25 6.25 tbd 6.2 14.4 18 dynamic characteristics dynamic load response (50-75-50% load step) 50 sec to 1% of ? nal value 200 sec to 1% of ? nal value 200 sec to 1% of ? nal value 200 sec to 1% of ? nal value 200 sec to 1% of ? nal value 150 sec to 2% of ? nal value start-up time v in to v out regulated, msec 5 4 10 max. 10 max. 10 max. 10 max. remote on/off to v out regulated, msec 5 4 10 max. 10 max. 10 max. 10 max. switching frequency, khz 360 20 400 24 315 30 315 30 330 40 300 30 khz environmental calculated mtbf 2.2m hours 2.2m hours tbd 1.7m hours 1.8m hours tbd operating temperature range, c. see derating curves. ?40 to +85, with derating operating case temperature, c (no derating) ?40 to +120, model dependent ?40 to +110 storage temperature range, c ?55 to +125 thermal protection/ shutdown, c 110-125, model dependent relative humidity to +85c/85%, non-condensing performance speci? cations and ordering guide ? ? specs are typical unless noted. single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 9 of 23
ucq-1.2/30-d48 ucq-1.5/25-d48 ucq-1.5/40-d48 ucq-1.8/30-d48 ucq-1.8/40-d48 physical outline dimensions see mechanical specs. pin material copper alloy pin diameter 0.040/0.062 inches (1.016/1.575 mm) pin ? nish nickel underplate with gold overplate weight, ounces 0.9 1.06 0.9 0.9 1.23 weight, grams 25 30 25 25 35 electromagnetic interference designed to meet en55022/cispr22 (external ? lter required) safety designed to meet ul 60950-1, csa c22.2 no.60950-1, iec/en 60950-1 ucq-3.3/40-d48 ucq-5/20-d24 ucq-5/20-d48 ucq-5/25-d48 ucq-12/8.3-d48 ucq-15/6.7-d48n-c physical outline dimensions see mechanical specs. pin material copper alloy pin diameter 0.040/0.062 inches (1.016/1.575 mm) pin ? nish nickel underplate with gold overplate weight, ounces 1.25 1.06 1.06 1.06 1.13 1.034 weight, grams 35.5 30 30 30 32 29.3 electromagnetic interference designed to meet en55022/cispr22 (external ? lter required) safety designed to meet ul 60950-1, csa c22.2 no.60950-1, iec/en 60950-1 ucq-2.5/40-d24 ucq-2.5/30-d48 ucq-3.3/35-d24 ucq-3.3/20-d48 ucq-3.3/30-d48 physical outline dimensions see mechanical specs. pin material copper alloy pin diameter 0.040/0.062 inches (1.016/1.575 mm) pin ? nish nickel underplate with gold overplate weight, ounces 1.06 1.06 1.06 0.7 1.06 weight, grams 30 30 30 20 30 electromagnetic interference designed to meet en55022/cispr22 (external ? lter required) safety designed to meet ul 60950-1, csa c22.2 no.60950-1, iec/en 60950-1 performance speci? cations and ordering guide ? ? specs are typical unless noted. single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 10 of 23
speci? cation notes (1) all models are tested and speci? ed with external 1||10 f ceramic/tantalum output capacitors 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 reg ulate within spec under no-load conditions. all speci? cations are typical unless noted. general conditions for speci? cations are +25 deg.c, v in and 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 awa re of reduced power dissipation with increasing altitude. (4) mean time before failure is calculated using the telcordia (belcore) sr-332 method 1, case 3, ground ? xed conditions, tpcb oard = +25 deg.c, full output load, natural air convection. (5) the on/off control is normally controlled by a switch or 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. (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. (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 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) output accuracy is dependent on user-supplied trim resistors. to achieve high accuracy, use 1% or better tolerance metal- ? lm resistors mounted close to the converter. (12) output current limit and short circuit protection is non-latching. when the overcurrent fault is removed, the converter wi ll 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) input fusing: to ensure reverse input protection with full output load, always connect an external input fast-blow fuse in series with the +v in input. use approximately twice the full input current rating with nominal input voltage. (16) hiccup overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. if the over current 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 recov ers normal operation. (17) normally, the sense lines are connected at the remote load to compensate for ir voltage drops in the power wiring and to i mprove dynamic response. if sense is not used, each sense pin should be con- nected at the converter to its respective vout pin. 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: ucq-1.2/30-d48nhl2-y ucq-1.8/30-d48nhl2-y ucq-1.8/40-d48nhl2-y ucq-2.5/30-d48nhl2-y ucq-2.5/40-d48nhl2-y ucq-5/20-d48nhl2-y ucq-12/8.3-d48nhl2-y these models are all negative on/off polarity, no baseplate, conformal coat- ing added, 3.68mm pin length, and rohs-5 hazardous substance compliance (with lead). ucq-3.3/30-d48nbhl2-y ucq-3.3/40-d48nbhl2-y these models are all negative on/off polarity, baseplate installed, conformal coating added, 3.68mm pin length, and rohs-5 hazardous substance compli- ance (with lead). single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 11 of 23
absolute maximum ratings input voltage 24v models 48v models continuous 0 to +36 volts 0 to +75 volts transient (100msec) +50 volts +100 volts on/off control 0v min. to +13.5v max. input reverse polarity protection see fuse section output current current-limited. devices can withstand sustained short circuit without damage. operating temperature C40 to +100c ( with derating) storage temperature C55 to +125c and external load capacitance. the difference in start up time from v in to v out and from on/off control to v out is therefore insigni? cant. input source impedance the input of ucq converters must be driven from a low ac-impedance source. the dc/dcs performance and stability can be compromised by the use of highly inductive source impedances. the input circuit shown in figure 3 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 ucq series are tested/speci? ed for input re? ected ripple current and output noise using the speci? ed external input/output components/ circuits and layout as shown in the following two ? gures. external input capaci- tors (c in in figure 3) serve primarily as energy-storage elements, minimiz- ing 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 sta- bility. in figure 3, c bus and l bus simulate a typical dc voltage bus. your speci? c system con? guration may necessitate additional considerations. these 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. 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 ucq series dc/dc converters, we recommend the use of a fast blow fuse, installed in the ungrounded input supply line with a typical value about twice the maximum input current, calculated at low line with the converters minimum ef? ciency. all relevant national and international safety standards and regulations must be observed by the installer. for system safety agency approvals, the convert- ers must be installed in compliance with the requirements of the end- use safety standard, i.e. iec/en/ul60950-1. 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 appropriately fused, it could cause permanent damage to the converter. input under-voltage 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 under-voltage 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. start-up time the v in to v out 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 speci? ed accuracy band. actual measured times will vary with input source impedance, external input capaci- tance, and the slew rate and ? nal value of the input voltage as it appears at the converter. the ucq series implements a soft start circuit to limit the duty cycle of its pwm controller at power up, thereby limiting the input inrush current. the on/off control to v out start-up time assumes the converter has its nominal input voltage applied but is turned off via the on/off control pin. the speci? cation de? nes the interval between the point at which the converter is turned on (released) and the fully loaded output voltage enters and remains within its speci? ed accuracy band. similar to the v in to v out start-up, the on/off control to v out start-up time is also governed by the internal soft start circuitry in critical applications, output ripple/noise (also referred to as periodic and random deviations or pard) may be reduced below speci? ed limits using ? lter- ing techniques, the simplest of which is the installation of additional external output capacitors. they function as true ? lter 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 volt- age and source impedance, as well as particular load and layout conditions. in figure 4, 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 ? inch and soldered directly to the ? xture. c in v in c bus l bus c in = 33f, esr < 700m @ 100khz c bus = 220f, esr < 100m @ 100khz l bus = 12h 3 1 +input Cinput current probe to oscilloscope + C figure 3. measuring input ripple current single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 12 of 23
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 to their appropri- ate 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 ucq series is capable of enduring an inde? nite short circuit output condition. remote sense note: the sense and v out 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 +v out and Csense to Cv out at the dc/ dc converter pins. ucq series converters employ a sense feature to provide point of use regulation, thereby overcoming moderate ir drops in pcb conduc- tors 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. [v out (+)-v out (C)] C [sense(+)-sense(C)] 10%v out in cables and discrete wiring applications, twisted pair or other techniques should be used. output over-voltage protection is monitored at the output volt- age pin, not the sense pin. therefore, excessive voltage differences between v out and sense in conjunction with trim adjustment of the output voltage can cause the over-voltage protection circuitry to activate (see performance speci- ? cations for over-voltage limits). power derating is based on maximum output current and voltage at the converters output pins. use of trim and sense func- tions can cause output voltages to increase, thereby increasing output power beyond the converters speci? ed rating, or cause output voltages to climb into the output over-voltage region. therefore, the designer must ensure: (v out at pins) x (i out ) rated output power floating outputs since these are isolated dc/dc converters, their outputs are ? oating with respect to their input. designers will normally use the Coutput (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 ucq converters employ a synchronous-recti? er 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 ucq converters are equipped with thermal-shutdown circuitry. if environ- mental 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 speci? cations. output over-voltage protection the ucq output voltage is monitored for an over-voltage condition using a com- parator. the signal is optically coupled to the primary side and if the output volt- age 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 over-voltage circuitry will initiate another shutdown cycle. this on/off cycling is referred to as hiccup mode. 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- 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 de? ned as the point at which the full-power output voltage falls below the speci? ed tolerance. see performance/functional speci? cations. if the load current, being drawn from the converter, is signi? cant enough, the unit will go into a short circuit condition as described below. figure 4. measuring output ripple/noise (pard) c1 c1 = 1f ceramic c2 = 10f tantalum load 2-3 inches (51-76mm) from module c2 r load 7 8 copper strip 4 5 copper strip scope +output Coutput +sense Csense ,/!$ /54054 n).054 3ense#urrent #ontactand0#"resistance lossesdueto)2drops #ontactand0#"resistance lossesdueto)2drops 3ense2eturn ).054 /./&& #/.42/, 42)- 3%.3% n/54054 n3%.3% ) /54 2eturn ) /54 figure 5. remote sense circuit con? guration single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 13 of 23
trimming output voltage ucq converters have a trim capability (pin 6) that enables users to adjust the output voltage (refer to the trim equations and trim graphs that follow). adjust- ments to the output voltage can be accomplished via a trim pot (figure 6) or a single ? xed resistor as shown in figures 7 and 8. a single ? xed resistor can increase or decrease the output voltage depending on its connection. resistors should be located close to the converter and have tcrs 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 Csense (pin 5) will decrease the output voltage. trim adjustments greater than the speci? ed range can have an adverse affect on the converters performance and are not recommended. excessive voltage differences between v out and sense, in conjunction with trim adjust- ment of the output voltage, can cause the over-voltage protection circuitry to activate (see performance speci? cations for over-voltage limits). temperature/ power derating is based on maximum output current and voltage at the converters output pins. use of the trim and sense functions can cause output voltages to increase, thereby increasing output power beyond the converters speci? ed rating, or cause output voltages to climb into the output over-voltage region. therefore: (v out at pins) x (i out ) rated output power 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 equations (for all models except the ucq-1.2/40-d24 and -1.2/30-d48) 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 q (for the ucq-1.2/40-d24 and -1.2/30-d48) trim down connect trim resistor between trim pin and ?sense 2 ? 2 5.11 r trimdn (k ) = trim up connect trim resistor between trim pin and +sense 1.225 5.11 v nom (1+ ) r trimup (k ) = ,/!$ 2 42)-$/7. /54054 n).054 ).054 /./&& #/.42/, 42)- 3%.3% n/54054 n3%.3% figure 8. trim connections to decrease output voltages using fixed resistors ,/!$ 2 42)-50 /54054 n).054 ).054 /./&& #/.42/, 42)- 3%.3% n/54054 n3%.3% figure 7. trim connections to increase output voltages using fixed resistors ,/!$ 452.3 /54054 n).054 ).054 /./&& #/.42/, 42)- 3%.3% n/54054 n3%.3% figure 6. trim connections using a trimpot 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 single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 14 of 23
the trim pin (pin 6) is a relatively high impedance node that can be suscep- tible to noise pickup when connected to long conductors in noisy environments. on/off control the input-side, remote on/off control function (pin 2) can be ordered to operate with either polarity: positive (no suf? x) polarity models are enabled when pin 2 is left open (or is pulled high, applying +3.5v to +13.5v with respect to Cinput, pin 1) as per figure 9. positive-polarity devices are disabled when pin 2 is pulled low (0 to 0.8v with respect to Cinput). negative (n suf? x) polarity devices are off when pin 2 is left open (or pulled high, applying +3.5v to +13.5v), and on when pin 2 is pulled low (0 to 1v) with respect to Cinput as shown in figure 10. 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 speci? cations) 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. 5#1 $/utput4ransient2esponse 6 ). 6resistiveloadstepto m6div secdiv 5#1 $%nable/n/ff 6 ). 6) /54 ! 6 /54 6div #ontrol 0in 6div msecdiv 5#1 $2ippleand.oise 6 ). 6) /54 !resistiveoutputcaps&ceramic\\&tantalum m6div secdiv 5#1 $/utput4ransient2esponse 6 ). 6resistiveloadstepto m6div secdiv typical performance curves 2 1 +vcc 13v circuit 5v circuit Ci n p u t o n /o f f c o n tr o l 3 +input figure 9. driving the negative polarity on/off control pin (simpli? ed circuit) 2 1 Ci n p u t +v cc o n /o f f c o n tr o l 3 +input figure 10. driving the negative polarity on/off control pin (simpli? ed circuit) single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 15 of 23
typical performance curves 4 6 8 10 14 16 18 20 12 24 26 28 30 22 72 74 70 78 76 82 80 84 88 86 90 v in = 48v v in = 75v efficiency (%) load current (amps) v in = 36v ucq-1.8/30-d48 efficiency vs line voltage and load current @25? c v in = 48v v in = 75v efficiency (%) load current (amps) v in = 36v 40 50 55 65 75 60 70 85 80 90 45 6 3 9 12 15 18 21 24 27 75 30 95 ucq-1.2/30-d48 efficiency vs line voltage and load current @25? c efficiency (%) load current (amps) 311 4567 910 12 813 21 14 15 16 17 19 20 22 24 23 25 18 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 ucq-1.5/25-d48 efficiency vs line voltage and load current @25? c v in = 48v v in = 75v v in = 36v output current (amps) ambient temperature ( c) 400 lfm 200 lfm 300 lfm 100 lfm 30 0 10 15 25 35 20 30 5 35 40 45 50 55 60 65 70 75 80 ucq-1.2/30-d48 maximum current temperature derating no baseplate, v in = 48v (at sea level), longitudinal airflow output current (amps) ambient temperature ( c) 400 lfm 200 lfm 300 lfm 100 lfm 30 0 10 15 25 20 30 5 35 40 45 50 55 60 65 70 75 80 ucq-1.5/25-d48 maximum current temperature derating no baseplate, v in = 48v (at sea level) , longitudinal airflow output current (amps) ambient temperature ( c) 400 lfm 200 lfm 300 lfm 100 lfm natural convection 30 22 24 18 20 28 26 32 30 35 40 45 50 55 60 65 70 75 8 0 ucq-1.8/30-d48 maximum current temperature derating no baseplate, v in = 48v (at sea level), longitudinal airflow single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 16 of 23
typical performance curves 4 8 12 16 20 24 28 32 36 40 0 2 4 6 8 10 12 14 16 18 20 22 40 45 50 55 60 65 70 75 80 85 90 95 ucq-1.8/40-d48 efficiency and power dissipation @25? c load current (amps) efficiency ( % ) power dissipation (watts) v in = 36v v in = 75v v in = 48v power dissipation v in = 48v 30 35 40 45 50 55 60 65 70 75 80 85 0 5 10 15 20 25 30 35 40 45 ucq-1.8/40-d48 maximum current temperature derating at sea level (v in = 48v, no baseplate, airflow is from vin to vout) output current (amps) ambient temperature ( c) 400 lfm 200 lfm 300 lfm 100 lfm natural convection v in = 48v v in = 75v v in = 36v ucq-2.5/30-d48 efficiency vs line voltage and load current @25? c efficiency (%) 40 50 55 65 75 60 70 85 80 90 45 95 load current (amps) 6 3 1 9 12 15 18 21 24 27 30 369 70 75 85 95 80 90 65 60 55 50 12 15 18 21 24 27 30 33 36 39 40 v in = 24v v in = 35v efficiency (%) load current (amps) v in = 18v ucq-2.5/40-d24 efficiency vs line voltage and load current @25? c output current (amps) ambient temperature ( c) 400 lfm 200 lfm 300 lfm 100 lfm 0 10 15 25 35 20 30 5 35 30 40 45 50 55 60 65 70 75 80 ucq-2.5/30-d48 maximum current temperature derating no baseplate, v in = 24v (at sea level) output current (amps) ambient temperature ( c) 400 lfm 200 lfm 300 lfm 100 lfm 30 0 10 15 25 35 20 30 5 35 40 45 50 55 60 65 70 75 80 ucq-2.5/40-d24 maximum current temperature derating no baseplate, v in = 24v (at sea level) single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 17 of 23
typical performance curves 10 12 14 16 18 20 30 35 40 45 50 55 60 65 70 75 80 85 ucq-3.3/20-d48 maximum current temperature derating at sea level (v in = 48v, longitudinal airflow, no baseplate) output current (amps) ambient temperature (c) 400 lfm 200 lfm 300 lfm 100 lfm 30 35 40 45 50 55 60 65 70 75 80 85 16 18 20 22 24 26 28 30 ucq-3.3/30-d48 maximum current temperature derating at sea level (v in = 48v, no baseplate, airflow is from vin to vout) ambient temperature (c) output current (amps) 400 lfm 200 lfm 300 lfm 100 lfm 65 70 75 80 85 90 95 2 5 8 11141720 0 3 6 9 12 15 18 ucq-3.3/20-d48 efficiency vs line voltage and load current @25c load current (amps) efficiency ( % ) power dissipation (watts) v in = 75v v in = 36v v in = 48v power dissipation v in = 48v 3 6 9 12151821242730 0 3 6 9 12 15 70 75 80 85 90 95 load current (amps) ucq-3.3/30-d48 efficiency vs line voltage and load current @25c efficiency ( % ) v in = 75v v in = 36v v in = 48v power dissipation (watts) power dissipation v in = 48v single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 18 of 23
typical performance curves 30 35 40 45 50 55 60 65 70 75 80 85 0 5 10 15 20 25 30 35 40 ucq-3.3/35-d24 maximum current temperature derating at sea level (v in = 24v, with baseplate, airflow is from -vin to +vin) output current (amps) ambient temperature (c) 400 lfm 200 lfm 300 lfm 100 lfm natural convection efficiency (%) load current (amps) 70 74 76 80 84 78 82 88 86 90 72 92 ucq-3.3/35-d24 efficiency vs line voltage and load current @25? c v in = 18v v in = 24v v in = 36v 5 379111719 15 21 23 25 27 29 35 33 31 30 35 40 45 50 55 60 65 70 75 80 85 0 5 10 15 20 25 30 35 40 ucq-3.3/35-d24 maximum current temperature derating at sea level (v in = 24v, no baseplate, airflow is from -vin to +vin) output current (amps) ambient temperature (c) 400 lfm 200 lfm 300 lfm 100 lfm natural convection single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 19 of 23
typical performance curves 30 35 40 45 50 55 60 65 70 75 80 85 0 10 20 30 40 50 ucq-3.3/40-d48 maximum current temperature derating at sea level (v in = 48v, with baseplate, transverse airflow) 400 lfm 200 lfm 300 lfm 100 lfm natural convection output current (amps) ambient temperature ( c) 4 8 12 16 20 24 28 32 36 40 0 2 4 6 8 10 12 14 16 18 20 22 40 45 50 55 60 65 70 75 80 85 90 95 ucq-3.3/40-d48 efficiency and power dissipation @25? c load current (amps) efficiency ( % ) power dissipation (watts) v in = 36v v in = 75v v in = 48v power dissipation v in = 48v 30 35 40 45 50 55 60 65 70 75 80 85 0 10 20 30 40 50 ucq-3.3/40-d48 maximum current temperature derating at sea level (v in = 48v, no baseplate, transverse airflow) 400 lfm 200 lfm 300 lfm 100 lfm natural convection output current (amps) ambient temperature ( c) single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 20 of 23
typical performance curves 0 2 4 6 8 10 12 14 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 60 64 68 72 76 80 84 88 92 96 ucq-5/20-d24 efficiency and power dissipation @25c load current (amps) efficiency ( % ) power dissipation (watts) v in = 36v v in = 18v v in = 24v power dissipation v in = 24v 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 ucq-5/20-d24 maximum current temperature derating at sea level (v in = 24v, no baseplate, airflow is from -vin to +vin) output current (amps) ambient temperature (c) 400 lfm 200 lfm 300 lfm 100 lfm 30 35 40 45 50 55 60 65 70 75 80 85 0 5 10 15 20 25 ucq-5/20-d24 maximum current temperature derating at sea level (v in = 24v, with baseplate, airflow is from -vin to +vin) output current (amps) ambient temperature (c) 400 lfm 200 lfm 300 lfm 100 lfm 95 90 85 80 75 70 ucq-5/20-d48 efficiency vs line voltage and load current @25c 4 6 8 10 12 14 16 18 20 load current (amps) efficiency ( % ) v in = 75v v in = 36v v in = 50v 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 ucq-5/20-d48 maximum current temperature derating at sea level (v in = 48v, no baseplate, airflow is from -vin to +vin) output current (amps) ambient temperature (c) 400 lfm 200 lfm 300 lfm 100 lfm single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 21 of 23
typical performance curves 50 55 60 65 70 75 80 85 90 95 0 2 4 6 8 10 12 14 16 18 3 5 7 9 11 13 15 17 19 21 23 25 ucq-5/25-d48 efficiency and power dissipation @25? c load current (amps) efficiency ( % ) power dissipation (watts) v in = 36v v in = 75v v in = 48v power dissipation v in = 48v 30 35 40 45 50 55 60 65 70 75 80 85 0 5 10 15 20 25 30 ucq-5/25-d48 maximum current temperature derating at sea level (v in = 48v, no baseplate, airflow is from vin to vout) 400 lfm 200 lfm 300 lfm 100 lfm output current (amps) ambient temperature ( c) 50 55 60 65 70 75 80 85 90 95 100 0.8 1.6 2.4 3.2 4 4.8 5.6 6.4 7.2 8.3 0 2 4 6 8 10 12 14 16 18 20 ucq-12/8.3-d48 efficiency and power dissipation @25? c load current (amps) efficiency ( % ) power dissipation (watts) v in = 36v v in = 75v v in = 48v power dissipation v in = 48v 4 5 6 7 8 9 10 30 35 40 45 50 55 60 65 70 75 80 85 ucq-12/8.3-d48 maximum current temperature derating at sea level (v in = 48v, no baseplate, longitudinal airflow) 400 lfm 200 lfm 300 lfm 100 lfm output current (amps) ambient temperature ( c) 4 5 6 7 8 9 10 30 35 40 45 50 55 60 65 70 75 80 85 ucq-12/8.3-d48 maximum current temperature derating at sea level (v in = 48v, with baseplate, longitudinal airflow) 400 lfm 200 lfm 300 lfm 100 lfm output current (amps) ambient temperature ( c) single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated dc/dc converters www.murata-ps.com email: sales@murata-ps.com 01 apr 2010 mdc_ucq models.b17 page 22 of 23
typical performance curves 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2 6.7 50 55 60 65 70 75 80 85 90 95 100 ucq-15/6.7-d48 efficiency and power dissipation @ta = 25? c load current (amps) efficiency ( % ) loss (watts) v in = 36v v in = 75v v in = 48v power dissipation v in = 48v 30 35 40 45 50 55 60 65 70 75 80 85 3.5 4.5 5.5 6.5 ucq-15/6.7-d48 maximum current temperature derating at sea level (v in = 48v, no baseplate, airflow is from vin to vout) 400 lfm 200 lfm 300 lfm 100 lfm output current (amps) ambient temperature ( c) 30 35 40 45 50 55 60 65 70 75 80 85 3.5 4.5 5.5 6.5 ucq-15/6.7-d48 maximum current temperature derating at sea level (v in = 48v, with baseplate, airflow is from vin to vout) 100 lfm output current (amps) ambient temperature ( c) single output ucq models low-pro? le, quarter brick, 8.3-40 amp isolated 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 01 apr 2010 mdc_ucq models.b17 page 23 of 23

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