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the uwq series offers high output current (up to 17 amps) in an industry standard quarter brick package requiring no heat sink for most applica- tions. the uwq 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 datacom and telecom systems. advanced automated surface mount assembly and planar magnetics deliver galvanic isolation rated at 2250 vdc for basic insulation. to power digital systems, the outputs offer fast settling to current steps and tolerance of higher capacitive loads. excellent ripple and noise speci? cations as- sure compatibility to cpus, asics, programmable logic and fpgas. no minimum load is required. for systems needing controlled startup/shutdown, an external remote on/off control may use either positive or negative polarity. a wealth of self-protection features include input undervoltage lockout and overtemperature shutdown using an on-board temperature sensor; overcurrent protection using the hiccup auto- restart technique, provides inde? nite short-circuit protection, along with output ovp. the synchronous recti? er topology offers high ef? ciency for minimal heat generation and no heat sink operation. the uwq series is certi? ed to safety standards ul/ en/iec/csa 60950-1, 2nd edition. it meets rfi/ emi conducted/radiated emission compliance to en55022, cispr22 with an external ? lter. product overview applications ? ? embedded systems, datacom and telecom installations, wireless base stations ? ? disk farms, data centers and cellular repeater sites ? ? remote sensor systems, dedicated controllers ? ? instrumentation systems, r&d platforms, auto- mated test ? xtures ? ? data concentrators, voice forwarding and speech processing systems features ? ? fixed dc outputs, 12v @17a ? ? industry standard quarter brick 2.3 x 1.45 x 0.46 open frame package ? ? wide range 18 to 75 vdc input voltages with 2250 volt basic isolation ? ? remote on/off enable control ? ? dosa-compatible pinouts and form factor ? ? 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) on/off control (2) -vin (3) open = on +vin (1) polarity) controller and power barrier figure 1. connection diagram typical topology is shown. murata power solutions recommends an external fuse. uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 1 of 17 for full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com/support typical unit typical unit
? 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 ceramic || 10 f electrolytic with a 22uf input capacitor. 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 uwq-12/17-q48 ? 12 17 204 100 120 1% 1.5% 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 pin length option blank = standard pin length 0.180 in. (4.6 mm) l1 = 0.110 in. (2.79 mm)* l2 = 0.145 in. (3.68 mm)* 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 polarity n = negative polarity p = positive polarity - uwq family series: wide input quarter brick baseplate (optional) blank = no baseplate, standard b = baseplate installed, optional b 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, baseplate installed, 0.110? pin length, rohs-6 compliance uwq-12/17-q48nbl1-c *special quantity order is required; no sample quantities available. note: some model number combinations may not be available. please contact murata power solutions. uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 2 of 17 www.murata-ps.com/support
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 3 of 17 www.murata-ps.com/support functional specifications absolute maximum ratings conditions ? 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 input reverse polarity none, install external fuse none vdc on/off remote control power on or off, referred to -vin 0 13.5 vdc output power 0 210 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 ? ? 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 rising input voltage none vdc reverse polarity protection none, install external fuse none vdc 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 tbd a2-sec. output in short circuit 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 22uf external input capacitor 300 400 ma-p-p pre-biased startup external output voltage < vset monotonic general and safety ef? ciency vin=48v, full load 90 92 % vin=18v 90 92 % isolation isolation voltage, input to output no 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 160 180 200 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% error band 220 275 sec dynamic load peak deviation same as above 1100 1300 mv features and options remote on/off control ? n suf? x: negative logic, on state on = pin grounded or external voltage 0 1 vdc negative logic, off state off = pin open or external voltage 3.5 13.5 vdc control current open collector/drain 1 2 ma p suf? x: positive logic, on state on = pin open or external voltage 3.5 13.5 v positive logic, off state off = ground pin or external voltage 0 1 v control current open collector/drain 1 2 ma base plate "b" suf? x optional
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 4 of 17 www.murata-ps.com/support output conditions ? 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 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 19 21 23 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 ground, no damage continuous short circuit protection method hiccup current limiting non-latching regulation ? line regulation vin=min. to max., vout=nom., full load 0.65 % of vout load regulation iout=min. to max., vin=nom. 1.5 % 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 full resistive load, low esr 0 5000 f mechanical (through hole models) outline dimensions (no baseplate) 2.3x1.45x0.46 max. inches (please refer to outline drawing) lxwxh 58.4x36.8x11.68 mm outline dimensions (with baseplate) 2.3x1.45x0.5 inches 58.4x36.8x12.7 mm weight no baseplate 1.6 ounces no baseplate 45 grams with baseplate 2.24 ounces with baseplate 63.5 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 b class radiated, en55022/cispr22 b class 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 ceramic output capacitors and a 22uf external input capacitor (see technical notes). all capacitors are low-esr types wired close to the converter. these capaci- tors 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 mlcc paralleled with 10f tantalum, 20 mhz oscilloscope bandwidth and full resistive load.
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 5 of 17 www.murata-ps.com/support performance data, uwq-12/17-q48nb-c maximum current temperature derating at sea level (vin = 24v, air ow from pin 1 to pin 4 on pcb, with baseplate) maximum current temperature derating at sea level (vin = 48v, air ow from pin 1 to pin 4 on pcb, with baseplate) maximum current temperature derating at sea level (vin = 36v, air ow from pin 1 to pin 4 on pcb, with baseplate) maximum current temperature derating at sea level (vin = 60v, air ow from pin 1 to pin 4 on pcb, with baseplate) maximum current temperature derating at sea level (vin = 75v, air ow from pin 1 to pin 4 on pcb, with baseplate) 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 100 lfm 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature (c) 65 lfm 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 100 lfm 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature (c) 65 lfm 2 4 6 8 10 12 14 16 18 30 35 40 45 50 55 60 65 70 75 80 85 100 lfm 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature (c) 65 lfm 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 100 lfm 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature (c) 65 lfm 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 100 lfm 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature (c) 65 lfm ef ciency vs. line voltage and load current @ +25? 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 1234567891011121314151617 load curre nt (amps) ef?ciency (%) v in = 18v v in = 24v v in = 36v v in = 48v v in = 60v v in = 75v
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 6 of 17 www.murata-ps.com/support performance data, uwq-12/17-q48nb-c maximum current temperature derating at sea level (vin = 48v, air ow from pin 1 to pin 4 on pcb, no baseplate) stepload transient response (vin=48v, iout=25-75-25% of imax, cload=1uf || 10uf, ta=+25?) ch2=vout, ch4=iout stepload transient response (vin=48v, iout=50-75-50% of imax, cload=1uf || 10uf, ta=+25?) ch2=vout, ch4=iout stepload transient response (vin=48v, iout=50-75-50% of imax, cload=5000uf, io=5a/div ta=+25?) ch2=vout, ch4=iout 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 100 lfm 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature (c) 65 lfm maximum current temperature derating at sea level vin = 36v (air ow from pin 1 to pin 4 on pcb), no baseplate 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 100 lfm 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature (c) 65 lfm maximum current temperature derating at sea level vin = 24v (air ow from pin 1 to pin 4 on pcb), no baseplate 8 9 10 11 12 13 14 15 16 17 18 30 35 40 45 50 55 60 65 70 75 80 85 100 lfm 200 lfm 300 lfm 400 lfm output current (amps) ambient temperature (c) 65 lfm
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 7 of 17 www.murata-ps.com/support performance data, uwq-12/17-q48nb-c start-up delay (vin=48v, iout=17a, cload=5000uf, ta=+25?) ch1= vin, ch2= vout start-up delay (vin=48v, iout=0a, cload=0, ta=+25?) ch1= vin, ch2= vout on/off enable delay (vin=48v, vout=nom, iout=17a, ta=+25?) ch1= enable, ch2= vout. on/off enable delay (vin=48v, vout=nom, iout=0a, ta=+25?) ch1= enable, ch2= vout. start-up delay (vin=48v, iout=17a, cload=0, ta=+25?) ch1= vin, ch2= vout on/off enable delay (vin=48v, vout=nom, iout=17a, cload=5000uf, ta=+25?) ch1= enable, ch2= vout.
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 8 of 17 www.murata-ps.com/support performance data, uwq-12/17-q48nb-c thermal image with hot spot at 9.56a with 25? ambient temperature. natural convention is used with no forced air ow. identi able and recommended maximum value to be veri ed in application. vin=48v, q5 max temp=128?/ipc9592 guidelines. output ripple and noise (vin=48v, iout=0a, cload= 1uf || 10uf, ta=+25?, bw=20mhz) output ripple and noise (vin=48v, iout=17a, c load= 1uf || 10uf, ta=+25?, bw=20mhz) (+vo) (+vin) (-vo) (-vin)
1 max (all pins) c l top view end view side view 8 4 3 2 1 bottom view end view mtg plane 4.78 0.188* [11.68] 0.46 7.61 0.300 58.4 2.30 36.8 1.45 0.26 0.010 min bottom clearance 3.8 0.15 2.000 50.80 15.24 0.600 .083 shoulder (at 60 mil pins) 0.060.002 @ pins 4 & 8 ref 2.000 50.80 @ pins 1-3, 9 0.040.002 1.020.05 1.520.05 .062 shoulder (at 40 mil pins) gold (5u"min) over nickel (50u" min) finish: (all pins) .060 pins: copper alloy material: .040 pins: copper alloy i/o connections (pin side view) pin function pin function 1 positive input 4 negative output 2 remote on/off control 3 negative input 8 positive output 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? *alternate pin lengths available (contact murata power solutions for information). pin location dimensions apply at circuit board level. mechanical specifications (open frame) uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 9 of 17 www.murata-ps.com/support
1 max (all pins) c l 4 3 1 8 2 bottom view 3.8 0.15 top view (.10 max screw penetration) 36.8 1.45 4x m3x0.5 threaded hole 47.24 1.860 2.30 58.4 26.16 1.030 end view end view mtg plane optional 'b' option side view baseplate (at 40 mil pins) .062 shoulder 4.78 0.188 * 7.61 0.300 0.26 0.010 min bottom clearance 50.80 2.000 15.24 0.600 50.80 2.000 ref 1.020.05 0.040.002 @ pins 1-3, 9 1.520.05 .060.002 @ pins 4 & 8 .083 shoulder (at 60 mil pins) 12.7 0.50 gold (5u"min) over nickel (50u" min) finish: (all pins) .060 pins: copper alloy material: .040 pins: copper alloy i/o connections (pin side view) pin function pin function 1 positive input 4 negative output 2 remote on/off control 3 negative input 8 positive output 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? mechanical specifications (baseplate) *alternate pin lengths available (contact murata power solutions for information). pin location dimensions apply at circuit board level. uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 10 of 17 www.murata-ps.com/support
1.47 37.3 2.000 50.80 1.00 25.4 0.100 min @ 1-4, 8 for pin shoulders 0.300 7.62 2.32 58.9 0.300 7.62 it is recommended that no parts be placed beneath converter (hatched area). ref: dosa standard speci?cation for quarter-brick dc/dc converters recommended footprint (view through converter) 1 2 3 4 8 c l finished hole sizes @ pins 4 & 8 (per ipc-d-275, level c) 0.070-0.084 (sec) c l (pri) c l top view finished hole sizes @ pins 1-3 (per ipc-d-275, level c) 0.048-0.062 recommended footprint i/o connections (pin side view) pin function pin function 1 positive input 4 negative output 2 remote on/off control 3 negative input 8 positive output 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-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 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-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 12 of 17 www.murata-ps.com/support
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 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 ungrounded input 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 reverse-polarity protection if the input voltage polarity is reversed, an internal diode will become forward biased and likely draw excessive current from the power source. if this source is not current-limited or the circuit appropriately fused, it could cause perma- nent damage to the converter. input under-voltage shutdown and start-up threshold under normal start-up conditions, converters will not begin to regulate properly until the rising input voltage exceeds and remains at the start-up threshold voltage (see speci? cations). once operating, converters will not turn off until the input voltage drops below the under-voltage shutdown limit. subsequent restart will not occur until the input voltage rises again above the start-up threshold. this built-in hysteresis prevents any unstable on/off operation at a single input voltage. users should be aware however of input sources near the under-voltage 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 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 and reasonable in- put voltage regulation. since real-world voltage sources have ? nite impedance, performance is improved by adding external ? lter components. sometimes only a small ceramic capacitor is suf? cient. since it is dif? cult to totally characterize technical notes all applications, some experimentation may be needed. note that external input capacitors must accept high speed switching currents. because of the switching nature of dc/dc converters, the input of these converters must be driven from a source with both low ac impedance and adequate dc input regulation. performance will degrade with increasing input inductance. excessive input inductance may inhibit operation. the dc input regulation speci? es that the input voltage, once operating, must never degrade below the shut-down threshold under all load conditions. be sure to use adequate trace sizes and mount components close to the converter. i/o filtering, input ripple current and output noise all models in this converter series are tested and speci? ed for input re? ected ripple current and output noise using designated external input/output compo- nents, circuits and layout as shown in the ? gures below. external input capaci- tors (c in in the ? gure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient ir drops in the input conductors. users should select input capacitors for bulk capacitance (at appropriate frequencies), low esr and high rms ripple current ratings. in the ? gure below, the c bus and l bus components simulate a typical dc voltage bus. your speci? c system con? guration may require additional considerations. please note that the values of c in , l bus and c bus 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 ? gure 3, the two copper strips simulate real-world printed circuit impedances between the power supply and its load. in order to minimize circuit errors and standardize tests between units, scope measurements should be made using bnc connec- tors or the probe ground should not exceed one half inch and soldered directly to the ? xture. floating outputs since these are isolated dc/dc converters, their outputs are ? oating with respect to their input. the essential feature of such isolation is ideal zero current flow between input and output. real-world converters however do exhibit tiny leakage currents between input and output (see speci? cations). these leakages consist of both an ac stray capacitance coupling component and a dc leakage resistance. when using the isolation feature, do not allow the isolation voltage to exceed speci? cations. otherwise the converter may c in v in c bus l bus c in = 33f, esr < 200m @ 100khz c bus = 220f, 100v l bus = 12h +input ?input current probe to oscilloscope + C + C figure 2. measuring input ripple current
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 14 of 17 www.murata-ps.com/support be damaged. designers will normally use the negative output (-output) as the ground return of the load circuit. you can however use the positive output (+output) as the ground return to effectively reverse the output polarity. minimum output loading requirements these converters employ a synchronous recti? er design topology. all models regulate within speci? cation and are stable under no load to full load conditions. operation under no load might however slightly increase output ripple and noise. thermal shutdown to protect against thermal over-stress, these converters include thermal shut- down circuitry. if environmental conditions cause the temperature of the dc/ dcs to rise above the operating temperature range up to the shutdown tem- perature, an on-board electronic temperature sensor will power down the unit. when the temperature decreases below the turn-on threshold, the converter will automatically restart. there is a small amount of hysteresis to prevent rapid on/off cycling. caution: if you operate too close to the thermal limits, the converter may shut down suddenly without warning. be sure to thoroughly test your application to avoid unplanned thermal shutdown. temperature derating curves the graphs in 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). note that these are average measurements. the converter will accept brief increases in temperature and/or current or reduced air? ow as long as the average is not exceeded. note that the temperatures are of the ambient air? ow, not the converter itself which is obviously running at higher temperature than the outside air. also note that natural convection is de? ned as very 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. we use both thermocouples and an infrared camera system to observe thermal performance. as a practical matter, it is quite dif? cult to insert an anemometer to precisely measure air? ow in most applications. sometimes it is possible to estimate the effective air? ow if you thoroughly understand the enclosure geometry, entry/exit ori? ce areas and the fan ? owrate speci? cations. caution: if you exceed these derating guidelines, the converter may have an unplanned over temperature shut down. also, these graphs are all collected near sea level altitude. be sure to reduce the derating for higher altitude. output overvoltage protection (ovp) this converter monitors its output voltage for an over-voltage condition using an on-board electronic comparator. the signal is optically coupled to the pri- mary side pwm controller. if the output exceeds ovp limits, the sensing circuit will power down the unit, and the output voltage will decrease. after a time-out period, the pwm will automatically attempt to restart, causing the output volt- age to ramp up to its rated value. it is not necessary to power down and reset the converter for 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 your circuit. consider using an appropriate external protection. current limiting (power limit with current mode control) as power demand increases on the output and enters the speci? ed limit inception range (current in voltage mode and power in current mode) limiting circuitry activates in the dc-dc converter to limit/restrict the maximum current or total power available. in voltage mode, current limit can have a constant or foldback characteristic. in current mode, once the current reaches a certain range the output voltage will start to decrease while the output current con- tinues 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 (current mode control) 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. figure 3. measuring output ripple and noise (pard) c1 c1 = 1f ceramic c2 = 10f low esr load 2-3 inches (51-76mm) from module c2 r load copper strip copper strip scope +output ?output
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 15 of 17 www.murata-ps.com/support figure 4. driving the on/off control pin (suggested circuit) on/off control -input +vcc 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: positive: models equipped with positive logic are enabled when the on/off pin is left open or is pulled high to +13.5v dc with respect to Cv in . an internal bias current causes the open pin to rise to +v in . positive-polarity devices are disabled when the on/off is grounded or brought to within a low voltage (see speci? cations) with respect to Cv in . negative: models with negative polarity are on (enabled) when the on/off is grounded or brought to within a low voltage (see speci? cations) with respect to 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. caution: do not apply voltages to the on/off pin when there is no input power voltage. otherwise the converter may be permanently damaged.
uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 16 of 17 www.murata-ps.com/support 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 [3] conducted emissions test results [4] 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. 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 5. conducted emissions test circuit graph 1. conducted emissions performance, cispr/en55022, class b, full load [4 [4 [4 [4 [4 [4 [4 4 [4 [4 [4 [4 [4 [4 [4 [4 [4 [ [4 [4 4 4 [4 4 4 4 4 4 4 [4 [4 [4 [4 [4 [4 4 4 4 4 4 [4 4 4 [ [ [4 [4 [4 4 4 4 4 4 [4 [4 [4 [ [ [4 [4 4 4 4 4 [4 [4 [4 [4 4 4 [4 [4 4 4 4 [4 4 4 4 4 4 4 4 [4 4 4 [4 [4 [4 4 4 4 4 4 4 4 4 4 4 4 4 [4 4 [4 4 4 4 ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] ] la la la la yo yo o yo o yo o o ut ut ut ut r r r r ec ec e ec e ec e e e e e om om m m om m m om m m m m me me m me m me m m m m m nd d d d nd nd nd n nd n n n n n n at t at at at at t at a a at t at a t t io i io o io o o io o o o o o o o ns ns n ns n n ns n n n n n n
,6?`i?
>?i> ,/>???>i? ???v>???`? 6>?>l?i ??ii`v>? i>??} i?i?i? ?l?i? i??i>?i ?i??? ?v?? v?????>? *iv????? ???>i >?i???ii ??li??11/ 1????`i i?-11/? vertical wind tunnel murata power solutions employs a custom-designed enclosed 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 can watch thermal characteristics of the unit under test (uut) with both dynamic loads and static steady-state conditions. a special optical port is used which is transparent to infrared wavelengths. the computer ? les from the ir camera can be studied for later analysis. both through-hole and surface mount converters are soldered down to a host carrier board for realistic heat absorption and spreading. both longitudinal and transverse 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 both 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 air? ow collimator mixes the heat from the heating ele- ment to make uniform temperature distribution. the collima- tor also reduces the amount of turbulence adjacent to the uut by restoring laminar air? ow. such turbulence can change the effective heat transfer characteristics and give 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 thermal 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. figure 6. 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 uwq-12/17-q48 series wide input, isolated dosa quarter brick dc/dc converters mdc_uwq-12/17-q48 series.a01.d7 page 17 of 17 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. ? 2012 murata power solutions, inc. www.murata-ps.com/support murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered
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