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mdc_uqq_a03 page of 7 uqq series wide input range single output dc/dc converters technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com features n rohs compliant n standard quarter-brick package/pinout in through-hole version n low cost; low profle, 0.43( 0.92mm) n 9-36v or 8-75v wide range inputs n output current: 4 to 25 amps n output voltages: 3.3, 5, 2, 5 or 24v n interleaved synchronous-rectifer topology n ultra high effciency n no output reverse conduction n outstanding thermal performance n on/off control, trim & sense functions n fully isolated, up to 2250vdc (basic) n output overvoltage protection n fully i/o protected; thermal shutdown n ul/en/iec60950- safety approvals n designed for rohs compliance from an 9-36v or 8-75v input, uqqs deliver outputs of 3.3v, 5v, 2v, 5v, or 24v. they employ an inter - leaved, synchronous-rectifer topology that exploits 00% of their duty cycle. they simultaneously achieve ultra-high effciency (to 9 %), tight line/load regula - tion, low noise, and quick step response. a state of the art, single-board, open-frame design with reduced component count, high effciency, low-on-resistance fets, and planar magnetics embedded in heavy-copper pc boards all contribute to impressive thermal derating. the uqqs feature set includes high isolation, input pi flters, input undervoltage shutdown, output overvolt - age protection, current limiting, short-circuit protection and thermal shutdown. the standard footprint carries on/off control (positive or negative polarity), output trim (+ 0/C20%) and output sense functions. all uqq quarter-bricks are designed to meet the basic-insulation requirements of ul/en/iec60950- and they will carry the ce mark. safety certifcations, emc compliance testing and qualifcation testing (including halt) are currently in progress. contact mps for latest updates. for applications requiring wide range input, improved electrical and thermal perfomance consider mps's new uqq series quarter- brick dc/dc converters. they measure just .45 x 2.30 x 0.43 inches (36.8 x 58.4 x 0.92mm) and ft the industry-standard footprint. product overview simplified schem atic 37)4#( #/.42/, /04/ )3/,!4)/. )3/,!4)/. "!22)%2 07- #/.42/,,%2 2%&%2%.#% %22/2!-0 )nputunderovervoltage currentsenseover temperature#omparators 6 ). 6 /54 n6 /54 n6 ). /./&& #/.42/, 42)- n3%.3% 3%.3% $ for full details go to www.murata-ps.com/rohs typical unit typical topology is shown.
mdc_uqq_a03 page 2 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com performance specifications and ordering guide root model ? output input effciency package (case/ pinout) v out (v) i out (a) power (watts) r/n (mvp-p) regulation v in nom. (volts) range (volts) i in , no load (ma) i in , full load (a) typ. max. line load min. typ. uqq-3.3/25-q12 3.3 25 82.5 50 80 0.05% 0.075% 2 9-36 80 7.8 86% 88% c68,p32 uqq-3.3/25-q48 3.3 25 82.5 50 00 0.05% 0.2% 48 8-75 80 .942 87% 88.5% c68,p32 uqq-5/17-q12 5 7 85 40 75 0.05% 0.06% 2 9-36 50 7.83 88.5% 90.5% c68,p32 uqq-5/20-q48 5 20 00 40 75 0.05% 0.% 48 8-75 50 2.29 89.5% 9% c68,p32 uqq-12/8-q12 2 8 96 40 75 0.05% 0.05% 2 9-36 80 8.99 87% 89% c68,p32 uqq-12/8-q48 2 8 96 95 50 0.05% 0.% 48 8-75 70 2.3 87.5% 89.5% c68,p32 uqq-15/7-q12 5 7 05 40 75 0.05% 0.% 2 9-36 250 9.67 89% 90.5% c68,p32 uqq-24/4-q12 24 4 96 25 70 0.05% 0.075% 2 0-36 20 8.99 87.7 89% c68,p32 maximum rated output quarter-brick package output confguration nominal output voltage u qq - / q12 - 5 17 n lx note: not all model number combinations are available. contact mps. input voltage range remote on/off control polarity: add "p" for positive polarity add "n" for negative polarity pin length option l1 = 0.0 (2.79mm) l2 = 0.45 (3.68mm) blank = std. pin length c rohs-6 compliant (please include this designator for all models) - 9 baseplate: b = baseplate installed blank = no baseplate baseplate pin 9 (special order): 9 = pin 9 installed, connects to baseplate blank = no pin 9 ? typical at ta = +25c under nominal line voltage and full-load conditions. all models are specified with an external f multi-layer ceramic and 0f capacitors across their output pins and 00f external input capacitor. ? ripple/noise (r/n) measured over a 20mhz bandwidth. ? devices have no minimum-load requirements and will regulate under no-load conditions. regulation specifications describe the output voltage deviation as the line voltage or load is varied from its nominal/midpoint value to either extreme. (load step = 50%.) ? nominal line voltage, no load/full load condition. ? these are incomplete part numbers, refer to the part number structure when ordering. some model options may require minimum order quantities. b pin 9 baseplate connection the uqq series may include an optional installed baseplate for extended thermal management. this baseplate is electrically isolated from the rest of the converter. various uqq models are also available with an additional pin 9 on special quantity order which electrically connects to the baseplate. pin 9 is also isolated from the rest of the converter. please refer to the mechanical drawings. pin 9 offers a positive method of controlling the electrical potential of the base - plate, independent of the converter. if you do not include pin 9, the baseplate may also be grounded by the mounting bolts. the baseplate may be ordered by adding a b to the model number tree and pin 9 will be pre-installed by adding a 9. the two options are separate. please refer to the ordering guide. do not order pin 9 without the baseplate. note that pin 9 converters may be on limited forecast, requiring minimum order quantities and scheduled deliveries. please see page 9 for heatsink informatio n . alternate pin lengths require quantity order. } performance specifcations and ordering guide ?
mdc_uqq_a03 page 3 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com all dimensions are in inches (mm) mechanical specifications * the remote on/off can be provided with either positive ("p" suffx) or negative ("n" suffx) polarity. 2.22 (56.39) 2.00 (50.80) 0.15 (3.81) a 1.860 (47.24) a a pins 1-3, 5-7: 0.040 0.001 (1.016 0.025) pins 4 & 8: 0.060 0.001 (1.52 0.025) #m3-thread x 0.15 deep typical (4) places baseplate optional baseplate 0.50(12.70) with baseplate 0.43(10.92) without baseplate 0.188 (4.78) 1.45 (36.83) 1.030 (26.16) b 0.600 (15.24) 4 eq. sp. @ 0.150 (3.81) b b bottom view 8 7 6 5 4 3 2 1 9 optional pin 9 connects to baseplate and is electrically isolated from converter input/output connections pin function p32 -input 2 remote on/off* 3 +input 4 -output 5 -sense 6 output trim 7 +sense 8 +output 9 baseplate (optional)
mdc_uqq_a03 page 4 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com uqq-3.3/25-q12 uqq-3.3/25-q48 uqq-5/17-q12 uqq-5/20-q48 uqq-12/8-q12 input input voltage range see ordering guide start-up threshold 9.0 volts 7.50 volts 9.0 volts 7.5 volts 9.0 volts undervoltage shutdown 8.0 volts 6.75 volts 8.0 volts 6.75 volts 8.0 volts overvoltage shutdown 40.0 volts na 37.5 volts none 37 volts refected (back) ripple current (2) 25map-p 5map-p 75map-p 25map-p 75map-p input current full load conditions see ordering guide inrush transient 0.a 2 sec 0.a 2 sec 0.a 2 sec 0.a 2 sec 0.a 2 sec output short circuit 250ma 00ma 00ma 250ma 250ma no load 50ma 80ma 50ma 50ma 80ma low line (v in = min.) 0.3 amps 5.04 amps 0.49 amps 6. amps .99 amps standby mode (off, uv, ot shutdown) 8ma 2ma 8ma 8ma 5ma internal input filter type lc pi-type l-c l-c l-c reverse polarity protection yes ( 5) na yes ( 5) yes ( 5) yes ( 5) remote on/off control (5) positive logic (p suffx) off = ground pin to +0.8v max. on = open or +3.5- 5v max. negative logic (n suffx) off = open or +5 to +v in max. on = ground pin to +0.8v max. ( 6) on/off current ma ma ma ma ma output voltage output range see ordering guide voltage output accuracy % of v nom (50% load) .25% of v nom (50% load) % of v nom (50% load) % of v nom (50% load) % of v nom (50% load) adjustment range C20 to + 0% of v nom C5 to + 0% of v nom C20 to + 0% of v nom C20 to + 0% of v nom C20 to + 0% of v nom temperature coeffcient 0.02% of v out range/c 0.02% of v out range/c 0.02% of v out range/c 0.02% of v out range/c 0.02% of v out range/c minimum loading no minimum load remote sense compensation +0% +0% +0% +0% +0% ripple/noise (20mhz bandwidth) see ordering guide line/load regulation effciency maximum capacitive loading low esr <0.02 w max., resistive load 0,000f 4700f 0,000f 0,000f 4700f isolation voltage input to output 2000 volts min. 2250 volts min. 2000 volts min. 2250 vvolts min. 2250 volts min. input fo baseplate 500 volts min. 500 volts min. 500 volts min. 500 volts min. 500 volts min. baseplate to output 500 volts min. 500 volts min. 750 volts min. 750 volts min. 750 volts min. isolation resistance 00m w 00m w 00m w 00m w 00m w isolation capacitance 500 pf 000 pf 500 pf 500pf 000 pf isolation safety rating basic insulation basic insulation basic insulation basic insulation basic insulation current limit inception (98% of v out , after warmup) 29 amps 29 amps 20.5 amps 25 amps 0 amps short circuit protection method current limiting, hiccup autorestart. remove overload for recovery. short circuit current 5 amps 5 amps 0.5 amps 5 amps 0.5 amps short circuit duration continuous, output shorted to ground (no damage) overvoltage protection via magnetic feedback 4 volts 3.96 volts max. 6 volts 6 volts 4.4 volts performance and functional specifcations
mdc_uqq_a03 page 5 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com uqq-12/8-q48 uqq-15/7-q12 uqq-24/4-q12 input input voltage range see ordering guide start-up threshold 7.5 volts 9.0 volts 9.0 volts undervoltage shutdown 6.0 volts 8.0 volts 8.0 volts overvoltage shutdown none 38.5 volts none refected (back) ripple current (2) 5map-p 50map-p 50map-p input current full load conditions see ordering guide inrush transient 0.a 2 sec 0.a 2 sec 0.a 2 sec output short circuit 00ma 250ma 250ma no load 90ma 250ma 20ma low line (v in = min.) 5.96a 0.20 amps 0.73 amps standby mode (off, uv, ot shutdown) 2ma 5ma 5ma internal input filter type pi-type l-c l-c reverse polarity protection na yes ( 5) yes ( 5) remote on/off control (5) positive logic (p suffx) off = ground pin to +0.8v max. on = open or +3.5- 5v max. negative logic (n suffx) off = open or +5 to +v in max. on = ground pin to +0.8v max. ( 6) on/off current ma ma ma output voltage output range see ordering guide voltage output accuracy % of v nom (50% load) % of v nom (50% load) % of v nom (50% load) adjustment range C20 to + 0% of v nom C20 to + 0% of v nom 0% of v nom temperature coeffcient 0.02% of v out range/c 0.02% of v out range/c 0.02% of v out range/c minimum loading no minimum loading remote sense compensation +0% +0% +0% ripple/noise (20mhz bandwidth) see ordering guide line/load regulation effciency maximum capacitive loading low esr <0.02 w max., resistive load 2200f 4700f 500f max isolation voltage input to output 2250 volts min. 2000 volts min. 2000 volts min. input fo baseplate 500 volts min. 500 volts min. 500 volts min. baseplate to output 500 volts min. 500 volts min. 500 volts min. isolation resistance 00m w 00m w 00m w isolation capacitance 000 pf 000 pf 000 pf isolation safety rating basic insulation basic insulation basic insulation current limit inception (98% of v out , after warmup) 0.5 amps 9.5 amps 5.75 amps short circuit protection method current limiting, hiccup autorestart. remove overload for recovery short circuit current 5 amps 0.5 amps 0.5 amps short circuit duration continuous, output shorted to ground (no damage) overvoltage protection via magnetic feedback 5 volts 8 volts 29 volts performance and functional specifcations (continued)
mdc_uqq_a03 page 6 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com uqq-3.3/25-q12 uqq-3.3/25-q48 uqq-5/17-q12 uqq-5/20-q48 uqq-12/8-q12 uqq-12/8-q48 uqq-15/7-q12 uqq-24/4-q12 dynamic characteristics dynamic load response 50sec to % of fnal value (50-75-50% load step) 00sec to % of fnal value (50-75-50% load step) 50sec to % of fnal value (50-75-50% load step) 50sec to 2% of fnal value (50-75-50% load step) start-up time vin to vout regulate 0msec 50msec max 0msec 0msec 0msec 20msec 0msec 0msec remote on/off to vout regulated 5msec 50msec max 5msec switching frequency 255 25khz 200 20khz 260 25khz 255 25khz 260 25khz 245 20khz 260 25khz 260 25khz environmental calculated mtbf (4) tbc operating temperature range (ambient) no baseplate, 300 lfm, no derating, vertical mount C40 to +65o C40 to +70oc C40 to +67c C40 to +70c C40 to +46c C40 to +57c (200lfm, with baseplate) C40 to +52c C40 to +56c with derating see derating curves operating temperature range with baseplate (no derating required) (3)( 4) C40 to +05oc C40 to +00oc C40 to +05c C40 to +05oc C40 to +05c C40 to +00c C40 to +05c C40 to +05c storage temperature range C55 to +25oc thermal protection/shutdown +20oc relative humidity to +85c/85% non-condensing physical outline dimensions see mechanical specifcations baseplate material aluminum pin material copper alloy pin diameter 0.04/0.062 inches, .06/.524 mm weight ounce (28 grams) electromagnetic interference (conducted and radiated) (external flter required) fcc part 5, class b, en55022 safety ul/cul 60950- , csa-c22.2 no.60950- , iec/en 60950- flammability ul 94v-0 specifcation notes: () all models are tested and specifed with 300 lfm airfow, external || 0 f ceramic/tantalum output capacitors and a 00 f external input capacitor. all capacitors are low esr types. these capacitors are necessary to accommodate our test equipment and may not be required to achieve specifed performance in your applications. all models are stable and regulate within spec under no-load conditions. general conditions for specifcations are +25c, v in = nominal, v out = nominal, full load unless noted. (2) input ripple current is tested and specifed over a 5hz to 20mhz bandwidth. input fltering is c in = 33 f tantalum, c bus = 220 f electrolytic, l bus = 2 h. (3) note that maximum power derating curves indicate an average current at nominal input voltage. at higher temperatures and/or lower airfow, 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 increas - ing density altitude. (4) mean time before failure is calculated using the telcordia (belcore) sr-332 method , case 3, ground fxed conditions, t pcboard = +25c, full output load, natural air convection. (5) the on/off control may be driven with external logic or by applying appropriate external voltages which are referenced to input common. the on/off control input should use either an open collector/open drain transistor or logic gate. (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. sinking excessive reverse current may damage the outputs. (8) output noise may be further reduced by adding an external flter. see i/o filtering and noise reduction. (9) all models are fully operational and meet published specifcations, including cold start at C40c. (0) regulation specifcations describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. () alternate pin length and/or other output voltages are available under special quantity order. (2) overvoltage shutdown on 48v input models can be eliminated under special quantity order. ov shutdown can be deleted in order to comply with certain telecom reliability requirements. these requirements attempt continued operation despite signifcant input overvoltage. (3) do not exceed maximum power specifcations when adjusting the output trim. (4) note that the converter may operate up to + 05c with the baseplate installed (+ 00c for the uqq-3.3/25-q48). however, thermal self-protection occurs near + 20c therefore, + 05c is recommended to avoid thermal shutdown. (5) if reverse polarity is accidentally applied to the input, a body diode will become forward biased and will accept considerable current. to ensure reverse input protection, always connect an external input fuse in series with the +v in input. use approximately twice the full input current rating with nominal input voltage. (6) for on/off control on negative-polarity uqq-3.3/25-q48n models, the maximum off mode control voltage is + 3.5 volts. for the on mode, the range is pin grounded to + volt max.
mdc_uqq_a03 page 7 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com absolute maximum ratings input voltage 12v models 48v models continuous 0 to +36v 0 to +75v transient ( 00msec) +50v +00v on/off control 0v min to +3.5v max. input reverse polarity protection see fuse section output overvoltage v out +20% max. output current (7) current-limited. devices can withstand sustained short circuit without damage. storage temperature C55 to +25 c lead temperature (soldering 0 sec. max.) +280 c absolute maximums are stress ratings. exposure of devices to any of these conditions may adversely affect long-term reliability. proper operation under conditions other than those listed in the performance/functional specifcations table is not implied nor recommended. removal of soldered uqqs from printed circuit boards should removal of the uqq from its soldered connection be needed, thor - oughly de-solder the pins using solder wicks or de-soldering tools. at no time should any prying or leverage be used to remove boards that have not been properly de-soldered frst. input source impedance uqq converters must be driven from a low ac-impedance input source. the dc/dcs performance and stability can be compromised by the use of highly inductive source impedances. the input circuit shown in figure 2 is a practical solution that can be used to minimize the effects of inductance in the input traces. for optimum performance, components should be mounted close to the dc/dc converter. i/o filtering, input ripple current, and output noise all models in the uqq series are tested/specifed for input ripple current (also called input refected ripple current) and output noise using the circuits and layout shown in figures 2 and 3. external input capacitors (c in in figure 2) serve primarily as energy-storage elements. figure 2. measuring input ripple current c in v in c bu s l bu s c in = 33f , esr < 700m ? @ 100khz c bu s = 220f , esr < 100m ? @ 100khz l bu s = 12h 3 1 +input Cinput current pr obe to oscilloscope + C technical notes they should be selected for bulk capacitance (at appropriate frequencies), low esr, and high rms-ripple-current ratings. the switching nature of dc/dc converters requires that dc voltage sources have low ac impedance as highly inductive source impedance can affect system stability. in figure 2, c bus and l bus simulate a typical dc voltage bus. your specifc system con - fguration may necessitate additional considerations. in critical applications, output ripple/noise (also referred to as periodic and random deviations or pard) can be reduced below specifed limits using fltering techniques, the simplest of which is the installation of additional external output capacitors. output capacitors function as true flter elements and should be selected for bulk capacitance, low esr, and appropriate frequency response. in figure 3, the two copper strips simulate real-world pcb impedances between the power supply and its load. scope measurements should be made using bnc connectors or the probe ground should be less than ? inch and soldered directly to the fxture. 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 be taken into consideration. os-con tm organic semiconductor capacitors (www.sanyo.com) can be especially effective for further reduction of ripple/noise. the most effective combination of external i/o capacitors will be a function of line voltage and source impedance, as well as particular load and layout conditions. our applications engineers can recommend potential solutions and discuss the possibility of our modifying a given devices internal fltering to meet your specifc requirements. contact our applications engineering group for additional details. figure 3. measuring output ripple/noise (pard) c1 c1 = 1f cerami c c2 = 10f t ant alum lo ad 2-3 inches (51-76mm) fr om module c2 r lo ad 7 8 copper stri p 4 5 copper stri p scope +output Coutput +sense Csense
mdc_uqq_a03 page 8 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com start-up threshold and undervoltage shutdown under normal start-up conditions, the uqq series will not begin to regulate properly until the ramping input voltage exceeds the start-up threshold. once operating, devices will turn off when the applied voltage drops below the undervoltage shutdown point. devices will remain off as long as the undervoltage condition continues. units will automatically re-start when the applied voltage is brought back above the start-up threshold. the hysteresis built into this function avoids an indeterminate on/off condition at a single input voltage. see performance/functional specifcations table for actual limits. start-up time the v in to v out start-up time is the interval between the point at which a ramping input voltage crosses the start-up threshold voltage and the point at which the fully loaded output voltage enters and remains within its specifed accuracy band. actual measured times will vary with input source impedance, external input capacitance, and the slew rate and fnal value of the input voltage as it appears to the converter. the on/off to v out start-up time assumes that the converter is turned off via the remote on/off control with the nominal input voltage already applied. on/off control the primary-side, remote on/off control function (pin 2) can be specifed to operate with either positive or negative polarity. positive-polarity devices ("p" suffx) are enabled when pin 2 is left open or is pulled high. posi - tive-polarity devices are disabled when pin 2 is pulled low (with respect to Cinput). negative-polarity devices are off when pin 2 is high and on when pin 2 is pulled low. see figure 4 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 specifcations) when activated and withstand appropriate voltage when deactivated. figure 4. driving the remote on/off control pin 6 2%& ). 0 5 4 %15)6!,%.4#)2#5)4&/2 0/3)4)6%!.$.%'!4)6% ,/')#-/$%,3 #/.42/, n) . 0 5 4 / . / & & # / . 42 / , #/--/. sense is connected at the load and corrects for resistive errors only. be careful where it is connected. any long, distributed wiring and/or signifcant inductance introduced into the sense control loop can adversely affect overall system stability. if in doubt, test the application, and observe the dc/dcs output transient response during step loads. there should be no appreciable ringing or oscillation. you may also adjust the output trim slightly to compensate for voltage loss in any external flter elements. do not exceed maximum power ratings. current limiting when power demands from the output falls within the current limit incep - tion range for the rated output current, the dc/dc converter will go into a current limiting mode. in this condition the output voltage will decrease proportionately with increases in output current, thereby maintaining a somewhat constant power dissipation. this is commonly referred to as power limiting. current limit inception is defned as the point where the full- power output voltage falls below the specifed tolerance. if the load current being drawn from the converter is signifcant enough, the unit will go into a short circuit condition. see short circuit condition. short circuit condition when a converter is in current limit mode the output voltages will drop as the output current demand increases. if the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the pwm controller. following a time-out period of about 50 milliseconds, the pwm will restart, causing the output volt - ages to begin ramping to their appropriate values. if the short-circuit condi - tion 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 uqq is capable of enduring an indefnite short circuit output condition. thermal shutdown uqq converters are equipped with thermal-shutdown circuitry. if the inter - nal temperature of the dc/dc converter rises above the designed operating temperature (see performance specifcations), 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. output overvoltage protection the output voltage is monitored for an overvoltage condition via magnetic coupling to the primary side. if the output voltage rises to a fault condition, which could be damaging to the load circuitry (see performance specifca - tions), 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 voltages again climb to excessive levels, the overvoltage circuitry will initiate another shutdown cycle. this on/off cycling is referred to as hiccup mode. sense input use the sense input with caution. many applications do not need the sense connection. sense is intended to correct small output accuracy errors caused by the resistive ohmic drop in output wiring as output current increases. this output drop (the difference between sense and v out when measured at the converter) should not be allowed to exceed 0.5v. consider using heavier wire if this drop is excessive.
mdc_uqq_a03 page 9 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com 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 the source is not current limited or the circuit appropriately fused, it could cause permanent damage to the converter. 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 a sustained, non-current-limited, input-voltage polarity reversal exists. for mps uqq series dc/dc converters, slow-blow fuses are recommended with values no greater than twice the maximum input current. trimming output voltage uqq converters have a trim capability (pin 6) that enables users to adjust the output voltage from + 0% to C20% (refer to the trim equations). adjustments to the output voltage can be accomplished with a single fxed resistor as shown in figures 5 and 6. a single fxed 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 00ppm/c to minimize sensitivity to changes in temperature. if the trim function is not used, leave the trim pin open. standard uqqs have a "positive trim" where 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 specifed + 0%/C20% 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 overvoltage protection circuitry to activate (see performance specifcations for overvoltage 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 uqqs specifed rating, or cause output voltages to climb into the output overvoltage region. therefore: (v out at pins) x (i out ) rated output power the trim pin (pin 6) is a relatively high impedance node that can be susceptible to noise pickup when connected to long conductors in noisy environments. in such cases, a 0.22 f capacitor to Coutput can be added to reduce this long lead effect. uqq series aluminum heatsink please note C the uqq series shares the same heatsink kits as the uvq series. therefore, when ordering these heat sinks, use the model numbers below which end with the uvq suffx. the uqq series converter baseplate can be attached either to an enclosure wall or a heatsink to remove heat from internal power dissipation. the discussion below concerns only the heatsink lo ad r trim do wn +output Cinput +input on/off contr ol trim +sense Coutput Csense 4 5 1 3 6 8 7 2 ,/!$ 2 42)-50 /54054 n).054 ).054 /./&& #/.42/, 42)- 3%.3% n/54054 n3%.3% figure 5. trim connections to increase output voltages using fixed resistors figure 6. trim connections to decrease output voltages using fixed resistors up v o ? 3.3 r t (k 7 ) = ? 10.2 13.3(v o ? 1.226) 3.3 ? v o r t (k 7 ) = ? 10.2 16.31 down up v o ? 5 r t (k 7 ) = ? 10.2 20.4(v o ? 1.226) 5 ? v o r t (k 7 ) = ? 10.2 25.01 down up v o ? 12 r t (k 7 ) = ? 10.2 49.6(v o ? 1.226) 12 ? v o r t (k 7 ) = ? 10.2 60.45 down up v o ? 15 r t (k 7 ) = ? 10.2 62.9(v o ? 1.226) 15 ? v o r t (k 7 ) = ? 10.2 76.56 down uqq-3.3/25-q12, uqq-3.3/25-q48 uqq-5/17-q12, uqq-5/20-q48 uqq-12/8-q12, uqq-12/8-q48 uqq-15/7-q12 up v o ? 24 r t (k 7 ) = ? 10.2 101 (v o ? 1.226) 24 ? v o r t (k 7 ) = ? 10.2 124.2 down uqq-24/4-q12 trim up trim down
mdc_uqq_a03 page 0 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com figure 7. model uqq heatsink assembly diagram alternative. the uqqs are available with a low-profle extruded aluminum heatsink kit, models hs-qb25-uvq, hs-qb50-uvq, and hs-qb 00-uvq. this kit includes the heatsink, thermal mounting pad, screws and mounting hardware. see the assembly diagram below. do not overtighten the screws in the tapped holes in the converter. this kit adds excellent thermal performance without sacrifcing too much component height. see the mechanical outline drawings for assembled dimensions. if the thermal pad is frmly attached, no thermal compound (thermal grease) is required. when assembling these kits onto the converter, include all kit hardware to assure adequate mechanical capture and proper clearances. thread relief is 0.090" (2.3mm). be aware that we need to handle only the internal heat dissipation, not the full power output of the converter. this internal heat dissipation is related to the effciency as follows: power dissipation [pd] = power in C power out [1] power out / power in = effciency [in %] / 100 [2] power dissipation [pd] = power in x (1 Ceffciency%/100) [3] power dissipation [pd] = power out x (1 / (effciency%/100) - 1) [4] effciency of course varies with input voltage and the total output power. please refer to the performance curves. since many applications do include fans, here is an approximate equation to calculate the net thermal resistance: r q [at airfow] = r q [natural convection] / (1 + (airfow in lfm) x [airfow constant]) [5] where, r q [at airfow] is the net thermal resistance (in c/w) with the amount of airfow available and, r q [natural convection] is the still air total path thermal resistance or in this case 2.5c/watt and, airfow in lfm is the net air movement fow rate immediately at the converter. this equation simplifes an otherwise complex aerodynamic model but is a useful starting point. the airfow constant is dependent on the fan and enclo - sure geometry. for example, if 200 lfm of airfow reduces the effective natural convection thermal resistance by one half, the airfow constant would be 0.005. there is no practical way to publish a one size fts all airfow constant because of variations in airfow direction, heatsink orientation, adjacent walls, enclosure geometry, etc. each application must be determined empirically and the equation is primarily a way to help understand the cooling arithmetic. this equation basically says that small amounts of forced airfow are quite effective removing the heat. but very high airfows give diminishing returns. conversely, no forced airfow causes considerable heat buildup. at zero airfow, cooling occurs only because of natural convection over the heatsink. natural convection is often well below 50 lfm, not much of a breeze. while these equations are useful as a conceptual aid, most users fnd it very diffcult to measure actual airfow rates at the converter. even if you know the velocity specifcations of the fan, this does not usually relate directly to the enclosure geometry. be sure to use a considerable safety margin doing thermal analysis. if in doubt, measure the actual heat sink temperature with a calibrated thermocouple, rtd or thermistor. safe operation should keep the heat sink below 00c. calculating maximum power dissipation to determine the maximum amount of internal power dissipation, fnd the ambient temperature inside the enclosure and the airfow (in linear feet per minute C lfm) at the converter. determine the expected heat dissipation using the effciency curves and the converter input voltage. you should also compen - sate for lower atmospheric pressure if your application altitude is considerably above sea level. 0!.(%!$3#2%7 -8-- 0,#3 ,/#+7!3(%2 - 0,#3 &,!47!3(%2 ./ 0,#3 (%!43).+ (%!442!.3&%20!$ 0eeloffwhiteplastic backingmaterialbefore attachingtoheatsink thermal performance the hs-qb25-uvq heatsink has a thermal resistance of 2 degrees celsius per watt of internal heat dissipation with natural convection airfow (no fans or other mechanical airfow) at sea level altitude. this thermal resistance assumes that the heatsink is frmly attached using the supplied thermal pad and that there is no nearby wall or enclosure surface to inhibit the airfow. the thermal pad adds a negligible series resistance of approximately 0.5c/watt so that the total assembled resistance is 2.5c/watt.
mdc_uqq_a03 page of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com the general proceedure is to compute the expected temperature rise of the heatsink. if the heatsink exceeds + 00c. either increase the airfow and/or reduce the power output. start with this equation: internal heat dissipation [pd in watts] = (ts C ta)/r q [at airfow] [6] where ta is the enclosure ambient air temperature and, where ts is the heatsink temperature and, where r q [at airfow] is a specifc heat transfer thermal resistance (in degrees celsius per watt) for a particular heat sink at a set airfow rate. we have already estimated r q [at airfow] in the equations above. note particularly that ta is the air temperature inside the enclosure at the heatsink, not the outside air temperature. most enclosures have higher internal temperatures, especially if the converter is downwind from other heat-producing circuits. note also that this pd term is only the internal heat dissipated inside the converter and not the total power output of the converter. we can rearrange this equation to give an estimated temperature rise of the heatsink as follows: ts = (pd x r q [at airfow]) + ta [7] 8.7 w = (90-30) / r q [airfow] or, r q [airfow] = 60/8.7 = 6.9c/w since the ambient thermal resistance of the heatsink and pad is 2.5c/w, we need additional forced cooling to get us down to 6.9c/w. using a hypothetical airfow constant of 0.005, we can rearrange equation [5] as follows: (required airfow, lfm) x (airfow constant) = r q [nat.convection] / r q [at airfow] C , or, (required airfow, lfm) x (airfow constant) = 2.5/6.9 C = 0.8 and, rearranging again, (required airfow, lfm) = 0.8 /0.005 = 62 lfm 62 lfm is the minumum airfow to keep the heatsink below +90c. increase the airfow to several hundred lfm to reduce the heatsink temperature further and improve life and reliability. h eatsink kit * model number still air (natural convection) thermal resistance heatsink height (see drawing) hs-qb25-uvq 2c/watt 0.25" (6.35mm) hs-qb50-uvq 0.6c/watt 0.50" (2.7mm) hs-qb00-uvq 8c/watt .00" (25.4mm) * kit includes heatsink, thermal pad and mounting hardware. 0.10 (2.54) * * uqq series heatsinks are available in 3 heights: 0.25 (6.35), 0.50 (12.70) and 1.00 (25.4) 1.45 (36.83) 2.28 (57.91) material: black anodized aluminum 1.03 (26.16) 1.860 (47.24) 0.140 dia. (3.56) (4 places) dimensions in inches (mm) optional heatsink these model numbers are correct for the uqq series. heat sink example assume an effciency of 92% and power output of 00 watts. using equation [4], pd is about 8.7 watts at an input voltage of 48 volts. using +30c ambient temperature inside the enclosure, we wish to limit the heat sink temperature to +90c maximum baseplate temperature to stay well away from thermal shut - down. the +90c. fgure also allows some margin in case the ambient climbs above +30c or the input voltage varies, giving us less than 92% effciency. the heat sink and airfow combination must have the following characteristics:
mdc_uqq_a03 page 2 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com typical performance curves 6 4 6 6 6 8 7 0 7 2 7 4 7 6 7 8 8 0 8 2 8 4 8 6 8 8 9 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 2 0 2 2 2 4 2 6 uqq-3.3/25-q48p efficiency vs. line voltage and load current @ 25 o c load current (amps) efficiency ( % ) v in = 72v v in = 60v v in = 48v v in = 36v v in = 24v v in = 18v 18 18.5 19 19.5 20 20.5 21 21.5 22 22.5 23 23.5 24 24.5 25 20 25 30 35 40 45 50 55 60 65 70 75 80 85 uqq-3.3/25-q12p maximum current temperature derating (no baseplate, v in = 12v, air flow is transverse) natural convection 300 lfm output current (amps) ambient temperature ( c) 400 lfm 200 lfm 100 lfm 20.0 20.5 21.0 21.5 22.0 22.5 23.0 23.5 24.0 24.5 25.0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 output current (amps) ambient temperature ( c) uqq-3.3/25-q12pb maximum current temperature derating (with baseplate, v in = 12v, air flow is transverse) 200 lfm 300 lfm 100 lfm natural convection uqq-3.3/25-q12 efficiency vs. line voltage and load current @ 25c load current (amps) efficiency (%) v in = 36v v in = 30v v in = 24v 90 88 86 84 82 80 78 76 74 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 v in = 18v v in = 12v
mdc_uqq_a03 page 3 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com typical performance curves 511 10 %fficiencyvs,ine6oltageand,oad#urrent ?# ,oad#urrent!mps %fficiency 6 ). 6 6 ). 6 6 ). 6 6 ). 6 6 ). 6 511 10 0ower$issipationvs,oad#urrent ?# ,oad#urrent!mps 0ower$issipation7atts 6 ). 6 6 ). 6 6 ). 6 6 ). 6 6 ). 6 output current (amps) ambient temperature ( c) ?40 25 30 35 40 45 50 55 60 65 70 75 80 85 17 16 15 14 13 12 11 400 lfm 200 lfm 300 lfm 100 lfm natural convection uqq-5/17-q12p maximum current temperature derating with baseplate, v in = 12v (transverse air flow at sea level) output current (amps) ambient temperature ( c) ?40 25 30 35 40 45 50 55 60 65 70 75 80 85 17 16 15 14 13 12 11 400 lfm 200 lfm 300 lfm 100 lfm natural convection uqq-5/17-q12p maximum current temperature derating no baseplate, vin = 12v (transverse air flow at sea level)
mdc_uqq_a03 page 4 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com 511 1 0ower$issipationvs,oad#urrent ?# ,oad#urrent!mps 0ower$issipation7atts 6 ). 6 6 ). 6 6 ). 6 6 ). 6 6 ). 6 output current (amps) ambient temperature ( c) ?40 25 30 35 40 45 50 55 60 65 70 75 80 85 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 400 lfm 200 lfm 300 lfm 100 lfm natural convection uqq-12/8-q12p maximum current temperature derating with baseplate, v in = 12v (transverse air flow at sea level) 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 uqq-12/8-q12p maximum current temperature derating (no baseplate, v in = 12v, air flow is transverse) output current (amps) ambient temperature ( c) natural convection 100 lfm 200 lfm 300 lfm 400 lfm 511 10 %fficiencyvs,ine6oltageand,oad#urrent ?# ,oad#urrent!mps %fficiency 6 ). 6 6 ). 6 6 ). 6 6 ). 6 6 ). 6 typical performance curves
mdc_uqq_a03 page 5 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com typical performance curves 74 76 78 80 82 84 86 88 90 92 uqq-12/8-q48p efficiency vs. line voltage and load current @ 2 5 c load current (amps) efficiency ( % ) 1 2 3 4 5 6 7 8 v in = 75v v in = 48v v in = 36v v in = 18v 4 4.5 5 5.5 6 6.5 7 7.5 8 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 output current (amps) ambient temperature ( c) uqq-12/8-q48p maximum current temperature derating (with baseplate, v in = 48v transverse air flow at sea level) natural convection 100 lfm 200 lfm 300 lfm 400 lfm 4 4.5 5 5.5 6 6.5 7 7.5 8 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 output current (amps) ambient temperature ( c) uqq-12/8-q48p maximum current temperature derating (with baseplate, v in = 24v, transverse air flow at sea level) natural convection 100 lfm 200 lfm 300 lfm 400 lfm
mdc_uqq_a03 page 6 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com typical performance curves 511 10 0ower$issipationvs,oad#urrent ?# ,oad#urrent!mps 0ower$issipation7atts 6 ). 6 6 ). 6 6 ). 6 6 ). 6 6 ). 6 511 10 %fficiencyvs,ine6oltageand,oad#urrent ?# ,oad#urrent!mps %fficiency 6 ). 6 6 ). 6 6 ). 6 6 ). 6 6 ). 6 output current (amps) ambient temperature ( c) ?40 25 30 35 40 45 50 55 60 65 70 75 80 85 7 6.5 6 5.5 5 4.5 4 3.5 200 lfm 300 lfm 100 lfm natural convection 400 lfm uqq-15/7-q12p maximum current temperature derating with baseplate, v in = 12v (transverse air flow at sea level)
mdc_uqq_a03 page 7 of 7 uqq series wide input range single output dc/dc converters d c / d c c o n v e r t e r s technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000 www.murata-ps.com murato power solutions, inc. cabot boulevard, mansfeld, ma 0204 8 -5 u.s.a. tel: (508) 339-3000 (800) 233-2765 fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com iso 9001 registered ds-0553 2/4/07 ? 2007 murata power solutions, inc. murata power solutions, inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. the descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. specifcations are subject to change without notice. typical performance curves output current (amps) ambient temperature ( c) 20 25 30 35 40 45 50 55 60 65 70 75 85 80 4 3.8 3.6 3.4 3.2 3 2.8 2.6 2.4 2.2 2 200 lfm 300 lfm 100 lfm natural convection 400 lfm uqq-24/4-q12p maximum current temperature derating no baseplate, v in = 12v (transverse air flow at sea level) usa: tucson (az), tel: (800) 547 2537, email: sales@murata-ps.com canada: toronto, tel: (866) 740 232, email: toronto@murata-ps.com uk: milton keynes, tel: +44 (0) 908 6 5232, email: mk@murata-ps.com france: montigny le bretonneux, tel: +33 (0) 34 60 0 0 , email: france@murata-ps.com germany: mnchen, tel: +49 (0)89-544334-0, email: ped.munich@murata-ps.com japan: tokyo, tel: 3-3779- 03 , email: sales_tokyo@murata-ps.com osaka, tel: 6-6354-2025, e mail: sales_osaka@murata-ps.com website: www.murata-ps.jp china: shanghai, tel: +86 2 5 027 3678, email: shanghai@murata-ps.com guangzhou, tel: +86 208 22 8066, email: guangzhou@murata-ps.com output current (amps) ambient temperature ( c) 20 25 30 35 40 45 50 55 60 65 70 75 85 80 4 3.8 3.6 3.4 3.2 3 2.8 2.6 2.4 2.2 2 200 lfm 300 lfm 100 lfm natural convection 400 lfm uqq-24/4-q12p maximum current temperature derating with baseplate, v in = 12v (transverse air flow at sea level) 93 92 91 90 89 88 87 86 uqq-24/4-q12p efficiency vs. line voltage and load current @ 2 5 c load current (amps) efficiency ( % ) 1 2 3 4 v in = 36v v in = 30v v in = 24v v in = 12v v in = 10v uqq-24/4-q12p power dissipation vs. load current @ 2 5 c 1 load current (amps) power dissipation (watts) 4 2 3 2 3 4 5 6 7 8 9 10 11 12 13 14 v in = 36v v in = 30v v in = 24v v in = 12v v in = 10v

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