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the uwq-12/17-q48t series offers high output current (up to 17 amps) in an industry standard quarter brick package requiring no heat sink for most applications. the uwq-12/17-q48t is trimmable from 10.8vout to 13.2vout and includes output sense pins to compensate for output voltage inaccuracy delivered at the load. the uwq-12/17- q48t series delivers ? xed dc output voltages up to 204 watts (12v @17a) for printed circuit board mounting. wide range inputs of 18 to 75 volts dc (48 volts nominal) are ideal for wireless base sta- tions, datacom, and telecom systems. advanced automated surface mount assembly, thermal management technology, and planar magnetics deliver high reliability galvanic isolation rated at 2250 vdc for basic insulation. to power digital systems, the output delivers fast settling to current steps and stable operation where higher capacitive loads are required. excellent ripple and noise speci? cations deliver stable 12v bus for ibc applications. for systems needing controlled startup/shutdown, an external remote on/off con- trol may use either positive or negative logic. several self-protection features include input un- dervoltage lockout, output overvoltage protection, and overtemperature shutdown (using an on-board temperature sensor); overcurrent protection us- ing the hiccup auto restart technique provides inde? nite short-circuit protection. the synchronous recti? er topology along with advanced thermal management delivers high ef? ciency for minimal heat generation and no heat sink operation. the uwq-12/17-q48t series is certi? ed to safety standards ul/en/iec/csa 60950-1, 2nd edition. it meets class b emi conducted emission compliance to en55022, cispr22 with an external ? lter. product overview applications ? ? wireless base stations embedded systems, datacom and telecom installations ? ? disk farms, data centers and cellular repeater sites ? ? remote sensor systems ? ? instrumentation systems, r&d platforms, auto- mated test ? xtures ? ? data concentrators, voice forwarding and speech processing systems features ? ? fixed dc output, 12v @17a (204w) ? ? industry standard quarter brick 2.3? x 1.45? x 0.46? (58.4 x 36.8 x 11.7mm) package without baseplate (0.5? [12.7mm] with baseplate) ? ? wide range vin 18 to 75 vdc ? ? trimmable 10.8vout to 13.2vout @ 210w max. ? ? 2250 volt basic isolation ? ? remote on/off enable control ? ? dosa-compatible pinouts, with trim and sense ? ? high ef? ciency synchronous recti? er topology ? ? stable no-load operation ? ? monotonic startup into pre-bias output condition ? ? certi? ed to ul/en 60950-1, csa-c22.2 no. 60950-1, 2nd edition safety approvals ? ? extensive self-protection, ovp, input undervolt- age, current limiting and thermal shutdown f1 external dc power source reference and error ampli?er -vout (4) +vout (8) trim (6) on/off control (2) -vin (3) open = on +vin (1) logic) controller and power barrier figure 1. connection diagram typical topology is shown. murata power solutions recommends an external fuse. uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 1 of 17 www.murata-ps.com www.murata-ps.com/support for full details go to www.murata-ps.com/rohs $ typical units typ th cu q fo tr i ou in a q4 to m s o ut pu t, 1 2v @ 17 a (2 04 w) ical units typ
http://www.murata-ps.com/data/power/uwq.pdf ? please refer to the part number structure for additional ordering information and options. ? all speci? cations are typical at nominal line voltage and full load, +25c unless otherwise noted. see detailed speci? cations. output capacitors are 1 f || 10 f with a 22f input ca pacitor. these caps are necessary for our test equipment and may not be needed for your application. ordering guide ? root model ? output input ef? ciency dimensions v out (volts) i out (amps, max.) power (watts) r/n (mv pk-pk) regulation (max.) ? v in nom. (volts) range (volts) i in no load (ma) i in full load (amps) typ. max. line load min. typ. (inches) (mm) u w q - 1 2 / 1 7 - q 4 8 t - c uwq-12/17-q48t-c ? 12 17 204 100 120 0.25% 0.3% 48 18-75 80 4.62 90% 92% 2 . 3 0 x 1 . 4 5 x 0 . 4 6 m a x . 2.30x1.45x0.46 max. 5 8 . 4 x 3 6 . 8 x 1 1 . 7 58.4x36.8x11.7 part number structure uwq pin 9 baseplate connection the uwq module has an additional pin 9 on special order that connects to the baseplate but is electrically 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 baseplate, indepen- dent of the converter. 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. pin length option blank = standard pin length 0.188 in. (4.78 mm) l1 = 0.110 in. (2.79 mm) * l2 = 0.145 in. (3.68 mm) * lx q48 input voltage range: q48 = 18-75 volts (48v nominal) / nominal output voltage 12 17 maximum rated output : current in amps - n on/off control logic n = negative logic p = positive logic - uwq family series: wide input quarter brick baseplate option blank = no baseplate, standard b = baseplate installed, optional b trim & sense t = trim & sense pins included ** t rohs hazardous materials compliance c = rohs-6 (does not claim eu rohs exemption 7bClead in solder), standard - c complete model number example: negative on/off logic, trim & sense included, baseplate installed, 0.110? pin length, rohs-6 compliance uwq-12/17-q48ntbl1-c * special quantity order is required; no sample quantities available. ** if trim & sense pins are not required, please click here for the uwq series (uwq-12/17-q48) data sheet, or contact murata power solutions. note: some model number combinations may not be available. please contact murata power solutions. 9 baseplate connect pin 9 (special order) * blank = no pin 9, standard 9 = pin 9 installed, connects to baseplate uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 2 of 17 www.murata-ps.com/support
uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 3 of 17 www.murata-ps.com/support functional specifications absolute maximum ratings conditions/comments ? minimum typical/nominal maximum units input voltage, continuous full power operation 18 48 80 vdc input voltage, transient operating or non-operating, 100 ms max. duration 100 vdc isolation voltage input to output 2250 vdc on/off remote control power on or off, referred to -vin 0 13.5 vdc output power 0 210.12 w output current current-limited, no damage, short-circuit protected 017a storage temperature range vin = zero (no power) -55 125 c absolute maximums are stress ratings. exposure of devices to greater than any of these conditions may adversely affect long-ter m reliability. proper operation under conditions other than those listed in the performance/functional speci? cations table is not implied or recommended. input conditions/comments ? ? operating voltage range 18 48 75 vdc recommended external fuse fast blow 20 a start-up threshold, measured at 50% load rising input voltage 16.5 17.5 17.9 vdc undervoltage shutdown, measured at 50% load falling input voltage 15 16 17 vdc overvoltage protection n/a internal filter type l-c input current full load conditions vin = nominal 4.52 4.76 a low line vin = minimum 12.06 12.69 a inrush transient vin = 48v. 0.05 0.1 a2-sec. short circuit input current 50 100 ma no load input current iout = minimum, unit=on 80 150 ma shut down mode input current 5 6.5 ma re? ected (back) ripple current ? measured at input with speci? ed ? lter 15 25 ma, rms back ripple current, no filtering 500 525 ma-p-p back ripple current, with 22f external input capacitor 300 400 ma-p-p general and safety ef? ciency vin=48v, full load 90 92 % isolation isolation voltage, input to output with or without baseplate 2250 vdc isolation voltage, input to baseplate with baseplate 1500 vdc isolation voltage, output to baseplate with baseplate 1500 vdc insulation safety rating basic isolation resistance 100 m isolation capacitance 1500 pf safety (certi? ed to the following requirements) ul-60950-1, csa-c22.2 no.60950-1, iec/en60950-1, 2nd edition yes calculated mtbf per telcordia sr-332, issue 1, class 3, ground ? xed, tambient=+25c tbc hours x 10 3 dynamic characteristics fixed switching frequency 250 275 300 khz startup time power on, to vout regulation band, 100% resistive load 60 65 ms startup time remote on to vout regulated 60 65 ms dynamic load response 50-75-50% load step to 3% of vout 220 275 sec dynamic load peak deviation same as above 500 700 mv features and options remote on/off control ? n suf? x: negative logic, on state on = pin connected to -vin or to external source 0 1 vdc negative logic, off state off = pin open or connected to external voltage source 3.5 13.5 vdc control current open collector/drain 1 2 ma p suf? x: positive logic, on state on = pin open or connected to external voltage source 3.5 13.5 v positive logic, off state off = pin connected to -vin or to external voltage 01v control current open collector/drain 1 2 ma base plate "b" suf? x
uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 4 of 17 www.murata-ps.com/support output conditions/comments ? minimum typical/nominal maximum units total output power 0.0 204 210 w voltage setting accuracy, ? xed output at 50% load, not user adjustable 11.64 12 12.36 vdc output voltage range user-adjustable -10 +10 % of vnom. overvoltage protection via magnetic feedback 15 vdc current output current range 0.0 17 17 a minimum load no minimum load current limit inception 97% of vnom., cold condition 17.5 19.5 21.5 a short circuit short circuit current hiccup technique, autorecovery within 1.25% of vout 56a short circuit duration (remove short for recovery) output shorted to -vout, no damage. continuous operation short circuit protection method hiccup technique-auto recovery regulation ? line regulation vin=min. to max., vout=nom., full load 0.25 % of vout load regulation iout=min. to max., vin=nom. 0.3 % of vout ripple and noise ? 5 hz- 20 mhz bw, cout=1f mlcc paralleled with 10f tantalum 100 120 mv pk-pk temperature coef? cient at all outputs 0.02 % of vout./c maximum capacitive loading low esr caps 0 5000 f remote sense compliance sense connected at load 10 % of vout mechanical (through hole models) outline dimensions (open frame) 2.3x1.45x0.46 inches 58.4x36.8x11.7 mm outline dimensions (with baseplate) 2.3x1.45x0.5 inches 58.4x36.8x12.7 mm weight with baseplate 2.12 ounces with baseplate 60.19 grams without baseplate 1.6 ounces without baseplate 45.36 grams through hole pin diameter 0.04 & 0.06 inches 1.016 & 1.52 mm through hole pin material copper alloy th pin plating metal and thickness nickel subplate 50 -inches gold overplate 5 -inches baseplate material aluminum environmental operating ambient temperature range see derating curves -40 85 c operating case temperature with baseplate, no derating -40 110 c storage temperature vin = zero (no power) -55 125 c thermal protection/shutdown measured in center 115 125 130 c electromagnetic interference external ? lter is required conducted, en55022/cispr22 class b with external ? lter rohs rating rohs-6 functional specifications, (cont.) notes ? unless otherwise noted, all speci? cations apply at vin = nominal, nominal output voltage and full output load. general conditions are near sea level altitude, no base plate installed and natural convection air? ow unless otherwise speci? ed. all models are tested and speci? ed with external parallel 1 f and 10 f multi-layer output capacitors and a 22f external input capacitor (see technical notes). all capacitors are low-esr types wired close to the converter. these capacitors are necessary for our test equipment and may not be needed in the users application. ? input (back) ripple current is tested and speci? ed over 5 hz to 20 mhz bandwidth. input ? ltering is cin = 33 f/100v, cbus = 220f/100v and lbus = 12 h. ? all models are stable and regulate to speci? cation under no load. ? the remote on/off control is referred to -vin. ? regulation speci? cations describe the output voltage changes as the line voltage or load current is varied from its nominal or midpoint value to either extreme. the load step is 25% of full load current. ? output ripple and noise is measured with cout = 1f paralleled with 10f, 20 mhz oscilloscope bandwidth and full resistive load.
typical performance data maximum current temperature derating at sea level (vin= 24v, air? ow from pin 1 to pin 3, with baseplate) maximum current temperature derating at sea level (vin= 48v, air? ow from pin 1 to pin 3, with baseplate) maximum current temperature derating at sea level (vin= 36v, air? ow from pin 1 to pin 3, with baseplate) maximum current temperature derating at sea level (vin= 60v, air? ow from pin 1 to pin 3, with baseplate) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 output current (amps) ambient temperature (c) natural convection 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 output current (amps) ambient temperature (c) natural convection 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 output current (amps) ambient temperature (c) natural convection 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 output current (amps) ambient temperature (c) natural convection 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) ef? ciency vs. line voltage and load current @ 25c 65 70 75 80 85 90 95 1234567891011121314151617 v in = 18v v in = 24v v in = 36v v in = 48v v in = 60v v in = 75v ef?ciency (%) load current (amps) power dissipation @ 25c 0 5 10 15 20 25 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 watts amps v in = 18v v in = 24v v in = 36v v in = 48v v in = 60v v in = 75v uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 5 of 17 www.murata-ps.com/support
typical performance data maximum current temperature derating at sea level (vin= 24v, air? ow from pin 1 to pin 3, without baseplate) maximum current temperature derating at sea level (vin= 48v, air? ow from pin 1 to pin 3, without baseplate) maximum current temperature derating at sea level (vin= 36v, air? ow from pin 1 to pin 3, without baseplate) maximum current temperature derating at sea level (vin= 60v, air? ow from pin 1 to pin 3, without baseplate) 5 6 7 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 output current (amps) ambient temperature (c) natural convection 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 output current (amps) ambient temperature (c) natural convection 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 output current (amps) ambient temperature (c) natural convection 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 output current (amps) ambient temperature (c) natural convection 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 6 of 17 www.murata-ps.com/support
typical performance data start-up delay (vin=48v, iout=17a, cload=5000f, ta=+25c) ch1=vin, ch2=vout on/off enable delay (vin=48v, vout=nom, iout=0a, cload=6000f, ta=+25c) ch1=enable, ch2= vout on/off enable delay (vin=48v, vout=nom, iout=17a, ta=+25c) ch1=enable, ch2= vout on/off enable delay (vin=48v, vout=nom, iout=17a, cload=6000f, ta=+25c) ch1=enable, ch2= vout start-up delay (vin=48v, iout=17a, ta=+25c) ch1=vin, ch2=vout start-up delay (vin=48v, iout=0a, cload=5000f, ta=+25c) ch1=vin , ch2=vout uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 7 of 17 www.murata-ps.com/support
typical performance data output ripple & noise (vin=48v, iout=0a, cload=1f || 10f, ta=+25c, bw=20mhz) pre-biased output voltage startup operation (vin=48vdc, iout=0a, cout=5000uf, ta=+25c) ch1=vin, ch2=vout. thermal image with hot spot at 9.22a with 25c ambient temperature. natural convection is used with no forced air? ow. identi? able and recommended maximum value to be veri? ed in application. output ripple & noise (vin=48v, iout=17a, cload=1f || 10f, ta=+25c, bw=20mhz) stepload transient response (vin=48v, iout=50-75-50% of imax, cload=1f || 10f, io=5a/div, ta=+25c) ch2=vout, ch4=iout stepload transient response (vin=48v, iout=50-75-50% of imax, cload=6000f, io=5a/div, ta=+25c) ch2=vout, ch4=iout uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 8 of 17 www.murata-ps.com/support
mechanical specifications ? open frame third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only and may vary between units. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 2? ref 2.000 .062 shoulder (at 40 mil pins) 3.8 .15 11.7 .46 (all pins) 1 max 4.78 .188 (note 1) side view @pins 1-3, 9 1.020.05 .040.002 1.570.05 .062.002 @pins 4 & 8 3 bottom view (pin side) 6 7 8 4 1 2 5 3.81 .150 50.80 2.000 3.81 .300 .300 7.62 .150 7.62 3.81 .150 end view mtg plane top view 58.4 2.30 36.8 1.45 3. dimensions are in inches [mm] 1. alternate pin lengths available c l .040 pins: copper alloy 4. pin location dimensions apply at 2. components shown are for ref only (see part number structure) 5. these converters meet the mechanical material: gold (5u"min) over nickel (50u" min) specifications of a quarter brick dc-dc circuit board level .062 pins: copper alloy finish: (all pins) converter end view 0.25 .010 min bottom clearance input/output connections pin function 1 +vin 2 remote on/off * 3 -vin 4 -vout 5 -sense 6 trim 7 +sense 8 +vout 9 no pin *the remote on/off can be provided with either positive (p suf? x) or negative (n suf? x) logic. uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 9 of 17 www.murata-ps.com/support
mechanical specifications ? with baseplate third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only and may vary between units. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 2? input/output connections pin function 1 +vin 2 remote on/off * 3 -vin 4 -vout 5 -sense 6 trim 7 +sense 8 +vout 9 baseplate (optional) *the remote on/off can be provided with either positive (p suf? x) or negative (n suf? x) logic. 4.78 0.188 1 max (all pins) 0.062 shoulder (at 40 mil pins) 2.000 ref 12.2 0.48 c l material: 0.040 pins: copper alloy 0.062 pins: copper alloy finish: (all pins) gold (5u"min) over nickel (50u" min) 1. alternate pin lengths available (see part number structure) 2. components shown are for ref only 3. dimensions are in inches [mm] 4. pin location dimensions apply at circuit board level 5. these converters meet the mechanical specifications of a quarter brick dc-dc converter end view 0.25 0.010 min bottom clearance top view 58.4 1.45 36.8 2.30 47.24 1.860 26.16 1.030 m3x0.5 x 0.10 max penetration (x4) 7 8 4 1 2 3 bottom view (pin side) 9 6 5 3.81 0.150 0.150 3.81 2.000 50.80 0.300 7.62 0.300 7.62 3.81 0.150 3.8 0.15 side view 1.020.05 0.0400.002 @pins 1-3, 9 1.570.05 0.0620.002 @pins 4 & 8 end view mtg plane optional pin #9 connects to baseplate and is electrically isolated from converter. uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 10 of 17 www.murata-ps.com/support
mechanical specifications third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only and may vary between units. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 2? 1.47 37.3 2.000 50.80 1.00 25.4 0.100 min @ 1-3, 5-7, 9 for pin shoulders 2.32 58.9 0.300 7.62 3.81 0.150 7.62 0.300 3.81 0.150 (when applicable) finished hole sizes @ pins 4 & 8 (per ipc-d-275, level c) for quarter brick dc/dc converters 3 2 1 4 8 c l ref: dosa standard specification (view through converter) 9 recommended footprint 0.070-0.084 (sec) c l (pri) c l 6 7 top view finished hole sizes @ 1-3, 5-7, 9 (per ipc-d-275, level c) 0.048-0.062 5 (hatched area) be placed beneath converter it is recommended that no parts uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 11 of 17 www.murata-ps.com/support
each static dissipative polyethylene foam tray accommodates 15 converters in a 3 x 5 array. 9.92 (251.97) ref 9.92 (251.97) ref 0.88 (22.35) ref carton accommodates two (2) trays yielding 30 converters per carton 10.50 (266.7) .25 11.00 (279.4) .25 2.75 (69.85) .25 closed height standard packaging third angle projection dimensions are in inches (mm) shown for ref. only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 2? uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 12 of 17 www.murata-ps.com/support
uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 13 of 17 www.murata-ps.com/support input fusing certain applications and/or safety agencies may require fuses at the inputs of power conversion components. fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. for greatest safety, we recommend a fast blow fuse installed in the +vin supply line. the installer must observe all relevant safety standards and regulations. for safety agency approvals, install the converter in compliance with the end-user safety standard. input under-voltage shutdown and start-up threshold under normal start-up conditions, converters will not begin to regulate properly until the rising input voltage exceeds and remains above the start-up threshold voltage (see speci? cations). once operating, converters will not turn off until the input voltage drops below the under-voltage shutdown limit. subsequent restart will not occur until the input voltage rises again above the start-up threshold. this built-in hysteresis prevents any unstable on/off opera- tion at a single input voltage. users should be aware however of input sources near the under-voltage shut- down whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor re- charges. such situations could oscillate. to prevent this, make sure the operating input voltage is well above the uv shutdown voltage at all times. start-up delay assuming that the output current is set at the rated maximum, the vin to vout start- up delay (see speci? cations) is the time interval between the point when the rising input voltage crosses the start-up threshold and the fully loaded regulated output voltage enters and remains within its speci? ed regulation band. actual measured times will vary with input source impedance, external input capacitance, input volt- age slew rate and ? nal value of the input voltage as it appears at the converter. these converters include a soft start circuit to moderate the duty cycle of the pwm controller at power up, thereby limiting the input and output inrush current. the on/off remote control interval from inception to v out regulated assumes that the converter already has its input voltage stabilized above the start-up threshold before the on command. the interval is measured from the on com- mand until the output enters and remains within its speci? ed regulation band. the speci? cation assumes that the output is fully loaded at maximum rated current. input source impedance these converters will operate to speci? cations without external components, assuming that the source voltage has very low impedance. since real-world voltage sources have ? nite minimum impedance, performance is improved by adding external ? lter components. sometimes only a small ceramic input capacitor is suf? cient. since it is dif? cult to totally characterize all applications, some experimentation may be needed. note that external input capacitors must accept high speed switching currents. performance will degrade with increasing input inductance. excessive input inductance may inhibit operation. the dc input regulation speci? es that the input voltage, once operating, must never degrade below the shut-down technical notes threshold under all load conditions. be sure to use adequate trace sizes and mount components close to the converter. i/o filtering, input ripple current and output noise all models in this converter series are tested and speci? ed for input re? ected ripple current and output noise using designated external input/output compo- nents, circuits and layout as shown in the ? gures below. external input capaci- tors (c in in the ? gure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient ir drops in the input conductors. users should select input capacitors for bulk capacitance (at appropriate fre- quencies), low esr and high rms ripple current ratings. in the ? gure below, the c bus and l bus components simulate a typical dc voltage bus. speci? c system con? gurations may require additional considerations. please note that the val- ues of c in , l bus and c bus may vary according to the speci? c converter model. in critical applications, output ripple and noise (also referred to as periodic and random deviations or pard) may be reduced by adding ? lter elements such as multiple external capacitors. be sure to calculate component temperature rise from re? ected ac current dissipated inside capacitor esr. in order to minimize circuit errors and standardize tests between units, scope measurements should be made using bnc connectors or the probe ground should not exceed one half inch and soldered directly to the ? xture. c in v in c bus l bus c in = 33f, esr < 200m @ 100khz c bus = 220f, 100v l bus = 12h +vin ?vin current probe to oscilloscope + C + C figure 2. measuring input ripple current figure 3. measuring output ripple and noise (pard) c1 c1 = 1f c2 = 10f load 2-3 inches (51-76mm) from module c2 r load scope +vout ?vout
uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 14 of 17 www.murata-ps.com/support these converters employ a synchronous recti? er design topology. all models regulate within speci? cation and are stable under no load to full load conditions. operation under no load might however slightly increase output ripple and noise. thermal shutdown to protect against thermal over-stress, these converters include thermal shut- down circuitry. if environmental or application conditions cause the tempera- ture of the dc-dcs to rise above the operating temperature range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. when the temperature decreases below the turn-on threshold, the converter will automatically restart. there is a small amount of hysteresis to prevent rapid on/off cycling. caution: if the product is operated too close to the thermal limits, it may shut down suddenly without warning. be sure to thoroughly test your application to avoid unplanned thermal shutdown. temperature derating curves the graphs in this data sheet illustrate typical operation under a variety of condi- tions. the derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced air? ow measured in linear feet per minute (lfm) or meters per second (m/s). note that these are average, steady state measurements. the converter will accept brief increases in temperature and/or current or reduced air? ow as long as the average is not exceeded. note that the temperatures are of the ambient air? ow, not the converter itself which is obviously running at higher temperature than the outside air. also note that natural convection is de? ned as very low ? ow rates which are not using fan-forced air? ow. depending on the application, natural convection is usu- ally about 30-65 lfm but is not equal to still air (0 lfm). murata power solutions makes characterization measurements in a closed cycle wind tunnel with calibrated air? ow. both thermocouples and an infrared camera system are used to observe thermal performance. caution: if these derating guidelines are exceeded, the converter may have an unplanned over temperature shut down. also, these graphs are all collected near sea level altitude. be sure to reduce the derating for higher altitude. output overvoltage protection (ovp) this converter monitors its output voltage for an over-voltage condition using magnetic feedback circuitry. if the output exceeds ovp limits, the sensing circuit will power down the unit, and the output voltage will decrease. after a time-out period, the pwm will automatically attempt to restart, causing the output voltage to ramp up to its rated value. it is not necessary to power down and reset the converter for this automatic ovp-recovery restart. if the fault condition persists and the output voltage climbs to excessive levels, the ovp circuitry will initiate another shutdown cycle. this on/off cycling is referred to as hiccup mode. output fusing the converter is extensively protected against current, voltage and temperature extremes. however, your application circuit may need additional protection. in the extremely unlikely event of output circuit failure, excessive voltage could be applied to the application circuit. consider using an appropriate external protection. current limiting as power demand increases on the output and enters the speci? ed limit inception range limiting circuitry activates in the dc-dc converter to limit/ restrict the maximum current or total power available. once the current reaches a certain range the output voltage will start to decrease while the output current continues to increase, thereby maintaining constant power, until a maximum peak current is reached and the converter enters a hiccup (on off cycling) mode of operation until the load is reduced below the threshold level, whereupon it will return to a normal mode of operation. current limit inception is de? ned as the point where the output voltage has decreased by a pre-speci? ed percentage (usually a 2% decrease from nominal). short circuit condition the short circuit condition is an extension of the current limiting condition. when the monitored peak current signal reaches a certain range, the pwm controllers outputs are shut off thereby turning the converter off. this is followed by an extended time out period. this period can vary depending on other conditions such as the input voltage level. following this time out period, the pwm controller will attempt to re-start the converter by initiating a normal start cycle which includes softstart. if the fault condition persists, another hiccup cycle is initiated. this cycle can and will continue inde? nitely until such time as the fault condition is removed, at which time the converter will resume normal operation. operating in the hiccup mode during a fault condition is advantageous in that average input and output power levels are held low preventing excessive internal increases in temperature. trimming output voltage uwq converters have a trim capability (pin 6) that enables users to adjust the output voltage from +10% to C10% (refer to the trim equations in the table below). adjustments to the output voltage can be accomplished with a single ? xed resistor as shown in figures 4 and 5. 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. standard uwqs 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 speci? ed +10%/C10% 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 speci? cations for overvoltage limits). floating outputs since these are isolated dc-dc converters, their outputs are ? oating with respect to their input. the essential feature of such isolation is ideal zero current flow between input and output. real-world converters however do exhibit tiny leakage currents between input and output. these leakages consist of both an ac stray capacitance coupling component and a dc leakage resistance. when using the isolation feature, do not allow the isolation voltage to exceed speci? cations. otherwise the converter may be damaged. designers will normally use the negative output (-output) as the ground return of the load circuit. you can however use the positive output (+output) as the ground return to effectively reverse the output polarity. minimum output loading requirements
uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 15 of 17 www.murata-ps.com/support 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 uwqs speci? ed 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. remote sense input use the sense inputs with caution. sense is normally connected at the load . sense inputs compensate for output voltage inaccuracy delivered at the load. this is done by correcting ir voltage drops along the output wiring and the current carrying capacity of pc board etch. this output drop (the difference between sense and vout when measured at the converter) should not exceed 0.5v. consider using heavier wire if this drop is excessive. sense inputs also improve the stability of the converter and load system by optimizing the control loop phase margin. note: the sense input and power vout lines are internally connected through low value resistors to their respective polarities so that the converter can operate without external connection to the sense. nevertheless, if the sense function is not used for remote regulation, the user should connect +sense to +vout and Csense to Cvout at the converter pins. the remote sense lines carry very little current. they are also capacitively coupled to the output lines and therefore are in the feedback control loop to regulate and stabilize the output. as such, they are not low impedance inputs and must be treated with care in pc board layouts. sense lines on the pcb should run adjacent to dc signals, preferably ground. in cables and discrete wiring, use twisted pair, shielded tubing or similar techniques. any long, distributed wiring and/or signi? cant inductance introduced into the sense control loop can adversely affect overall system stability. if in doubt, test your applications by observing the converters output transient response during step loads. there should not be any appreciable ringing or oscillation. you may also adjust the output trim slightly to compensate for voltage loss in any external ? lter elements. do not exceed maximum power ratings. remote on/off control on the input side, a remote on/off control can be speci? ed with either positive or negative logic as follows: models are on (enabled) when the on/off is grounded or brought to within a low voltage (see speci? cations) with respect to Cv in . the device is off (disabled) when the on/off is left open or is pulled high to +13.5v dc max. with respect to Cv in . dynamic control of the on/off function should be able to sink the speci? ed signal current when brought low and withstand speci? ed voltage when brought high. be aware too that there is a ? nite time in milliseconds (see speci? cations) between the time of on/off control activation and stable, regulated output. this time will vary slightly with output load type and current and input conditions. there are two cautions for the on/off control: caution: while it is possible to control the on/off with external logic if you carefully observe the voltage levels, the preferred circuit is either an open drain/open collector transistor or a relay (which can thereupon be controlled by logic). the on/off prefers to be set at approx. +13.5v (open pin) for the on state, assuming positive logic. figure 6. remote sense circuit con? guration load contact and pcb resistance losses due to ir drops contact and pcb resistance losses due to ir drops +vout +sense trim ? sense -vout + vin on/off control C vin sense current i out sense return i out return load r trim up +vout +vin Cvin on/off control trim +sense Cvout Csense figure 4. trim connections to increase output voltages using fixed resistors load r trim down +vout +vin Cvin on/off control trim +sense Cvout Csense figure 5. trim connections to decrease output voltages using fixed resistors up v o ? 12 r t (k ) = ? 10.2 49.6(v o ? 1.226) 12 ? v o r t (k ) = ? 10.2 60.45 down trim up* trim down* *vo = desirable output voltage in volts
uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 16 of 17 www.murata-ps.com/support figure 7. driving the on/off control pin (suggested circuit) on/off control -vin +vcc caution: do not apply voltages to the on/off pin when there is no input power voltage. otherwise the converter may be permanently damaged. please observe sense inputs tolerance to avoid improper operation: [vout(+) ?vout(-)] ? [sense(+) ?sense(-)] 10% of vout output overvoltage protection is monitored at the output voltage pin, not the sense pin. therefore excessive voltage differences between vout and sense together with trim adjustment of the output can cause the overvoltage protec- tion circuit to activate and shut down the output. power derating of the converter is based on the combination of maximum output current and the highest output voltage. therefore the designer must ensure: (vout at pins) x (iout) (max. rated output power) emissions performance murata power solutions measures its products for radio frequency emissions against the en 55022 and cispr 22 standards. passive resistance loads are employed and the output is set to the maximum voltage. if you set up your own emissions testing, make sure the output load is rated at continuous power while doing the tests. the recommended external input and output capacitors (if required) are includ- ed. please refer to the fundamental switching frequency. all of this information is listed in the product speci? cations. an external discrete ? lter is installed and the circuit diagram is shown below. [1] conducted emissions parts list [2] conducted emissions test equipment used rohde & schwarz emi test receiver (9khz C 1000mhz) espc rohde & schwarz software espc-1 ver. 2.20 hp11947a transient limiter (agilent) ohmite 25w C resistor combinations dc source programmable dc power supply model 62012p-100-50 reference part number description vendor l1 pe-62913 1mh, 6a pulse l3 500uh,10a, mps 500uh,10a murata c8 2.2ufd murata c7 vz series qty 2 - electrolytic capacitor 22ufd, 100v panasonic c16, c17 .22ufd unknown uwq emi 200w test card 48vdc in, 12vout, 17amps v+ v- black vin - vout - vout + vin + resistive load uut resistive load inside a metal container l1 l3 c7 c16 c17 c8 c8 c8 c8 c8 c8 figure 8. conducted emissions test circuit [3] layout recommendations most applications can use the ? ltering which is already installed inside the converter or with the addition of the recommended external capacitors. for greater emissions suppression, consider additional ? lter components and/or shielding. emissions performance will depend on the users pc board layout, the chassis shielding environment and choice of external components. please refer to application note gean02 for further discussion. since many factors affect both the amplitude and spectra of emissions, we recommend using an engineer who is experienced at emissions suppression.
figure 9. vertical wind tunnel 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 ir video camera ir transparent optical window variable speed fan heating element ambient temperature sensor air?ow collimator precision low-rate anemometer 3 below uut unit under test (uut) vertical wind tunnel murata power solutions employs a computer controlled custom-designed closed loop vertical wind tunnel, infrared video camera system, and test instrumentation for accurate air? ow and heat dissipation analysis of power products. the system includes a precision low ? ow-rate anemometer, variable speed fan, power supply input and load controls, temperature gauges, and adjustable heating element. the ir camera monitors the thermal performance of the unit under test (uut) under static steady-state conditions. a special optical port is used which is transparent to infrared wavelengths. both through-hole and surface mount converters are sol- dered down to a 10" by 10" host carrier board for realistic heat absorption and spreading. both longitudinal and trans- verse air? ow studies are possible by rotation of this carrier board since there are often signi? cant differences in the heat dissipation in the two air? ow directions. the combination of adjustable air? ow, adjustable ambient heat, and adjustable input/output currents and voltages mean that a very wide range of measurement conditions can be studied. the collimator reduces the amount of turbulence adjacent to the uut by minimizing air? ow turbulence. such turbulence in? uences the effective heat transfer characteristics and gives false readings. excess turbulence removes more heat from some surfaces and less heat from others, possibly causing uneven overheating. both sides of the uut are studied since there are different ther- mal gradients on each side. the adjustable heating element and fan, built-in temperature gauges, and no-contact ir camera mean that power supplies are tested in real-world conditions. uwq-12/17-q48t-c series wide input, isolated dosa quarter brick dc-dc converters with trim and sense mdc_uwq-12-17-q48t-c.a01 page 17 of 17 www.murata-ps.com/support 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. ? 2013 murata power solutions, inc. murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered this product is subject to the following operating requirements and the life and safety critical application sales policy : refer to: http://www.murata-ps.com/requirements/

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