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11-13.2vin, 54.2v/4.44a single output, high ef? ciency sip converter features ? ? 240 watts total output power ? ? 94% ultra-high ef? ciency @ full load, 100lfm ? ? 12v input (11-13.2v range) ? ? 54.2v/4.44a output for poe+ (power-over-ethernet) ? ? input over/under voltage shutdown ? ? 320khz ? xed switching frequency ? ? fully isolated, 2250v (basic) ? ? low 500mvp-p ripple/noise max value. ? ? pgood signal ? ? stable no-load operation ? ? thermal shutdown ? ? fully i/o protected ? ? ul 1950/iec/en60950 certi? cation ? ? output over voltage latch ordering guide summary model vout range iout range vin range ripple/noise ef? ciency spc-54/4.4-l12pg-c 54.2v 0-4.44a 11-13.2v 500mvp-p (max) 94% input characteristics parameter typ. @ 25c, full load notes voltage range 11-13.2 volts 12v nominal current, full power 24.5 amps vin = 11v turn on/start-up threshold 10.3-11 volts vin increasing undervoltage shutdown 9-9.9 volts vin decreasing no load current 300ma vin = 12v output characteristics parameter typ. @ 25c, full load notes voltage 54.2 volts 1% current 0 to 4.44 amps no minimum load power output 240 watts ripple & noise 500mvp-p 20mhz bandwidth, 100f output capacitance line and load regulation 1%/1% overcurrent protection 5.33 amps with hiccup auto-restart overtemperature protection 130 c ef? ciency (minimum) 92.8% 80% load, vin nom. ef? ciency (typical) 94% general specifications parameter typ. @ 25c, full load notes dynamic load response 500sec 50-75-50% step to 1% of vout operating ambient temperature C40 to +80c safety features ul 1950, iec/en60950 physical specifications parameter inches millimeters dimensions 2.60 x 0.69 x 1.25 66.0 x 17.5 x 31.75 performance specifications and ordering guide model ? output input ef? ciency 80% load, vin nom. package (pinout) v out (volts) i out (amps, max.) power r/n (mv pk-pk) regulation (max.) v in nom. (volts) range (volts) i in , no load (ma) vin @ min, full load (amps) (watts) max. line load % min. % typ. spc-54/4.4-l12pg-c 54.2 4.44 240 500 1% 1% 12 11-13.2 300 24.5 92.8 94 see mechanical drawing www.murata-ps.com www.murata-ps.com/support for full details go to www.murata-ps.com/rohs $ spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 1 of 13 typical unit
functional specifications ? ? absolute maximum ratings conditions minimum typical/nominal maximum units input voltage, continuous full power operation 0 13.2 vdc isolation voltage input to output tested 100 ms 2250 vdc input reverse polarity none, install external fuse none vdc on/off remote control power on or off, referred to -vin 0 5 vdc output power 0 240 w output current current-limited, no damage, short-circuit protected 0 4.44 a 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 nor recommended. input operating voltage range 11 12 13.2 vdc input voltage slew rate 1 v/s turn on/start-up threshold rising input voltage 10.3 11 vdc turn off/undervoltage lockout falling input voltage 9.2 9.9 vdc hysteresis 1 4 vdc overvoltage shutdown 13.8 14.8 vdc reverse polarity protection none, install external fuse none vdc internal filter type pi input current full load conditions vin = nominal 22.5 a low line vin = minimum 24.5 a inrush transient peak current 30 a i2t 0.1 a 2 /sec no load input current iout = minimum, unit = on 300 500 ma shut-down mode input current 10 ma re? ected (back) ripple current the external input capacitance shall be the max capacitance 0.1 arms back ripple current no ? ltering 2 arms input capacitance ? 250 750 f general and safety ef? ciency (ta = 25c, 100 lfm, air? ow across long axis, vin = 12v) 80% of irated iout 100% of irated 92.8 94 % 50% of irated iout < 80% of irated 91.8 93.5 % 20% of irated 86.8 88.5 % ef? ciency (ta = 80c, 250 lfm, air? ow across long axis, vin = 12v) 80% of irated iout 100% of irated 92.8 94 % 50% of irated iout < 80% of irated 91.8 93.5 % 20% of irated 86.8 88.5 % isolation isolation voltage input to output, continuous 2250 vdc insulation safety rating basic isolation resistance 10 m isolation capacitance 3300 pf safety certi? ed to ul-60950-1, csa-c22.2 no.60950-1, iec/en60950-1, 2nd edition yes calculated mtbf per telcordia sr332, issue 1 class 3, ground ? xed, tambient = +25?c 1 hours x 10 6 service life at 40c ambient temperature with 80% load 10 years esd human body model (hbm) 2000 v charged device model (cdm) 500 v machine model (mm) 200 v www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 2 of 13
dynamic characteristics conditions minimum typical/nominal maximum units fixed switching frequency 320 khz startup time vin on to vout regulated (100% resistive load) 30 ms startup time remote on to 10% vout (50% resistive load) 30 ms turn-on/turn-off turn-on delay ? 30 ms output voltage rise time ? 80 ms pre-bias voltage ? 100 % turn-on overshoot ? 2% turn-off undershoot ? 0% dynamic load response 1a/s, 25% of full load change 500 800 sec dynamic load peak deviation 1a/s, 25% of full load change 1000 mv features and options remote on/off control enable logic, on state 25v enable logic, off state pin open = off 0 0.8 v control pin shutdown current 0.5 ma output total output power see derating 240 w voltage nominal output voltage vin = 12v; iout = 2.22a 53.658 54.2 54.742 vdc setting accuracy -1 1 % of vnom. current output current range 0 4.44 4.44 a minimum load no minimum load current limit inception 98% of vnom., after warmup 4.88 6.2 a short circuit short circuit duration (remove short for recovery) output shorted to ground, no damage hiccup short circuit protection method current limiting regulation line regulation vin = min. to max. vout = nom. 1 % load regulation iout = min. to max. vin = nom. 1 % ripple and noise 20 mhz bw, with 0.1f and 1f ceramic capaci- tors, and 100f output capacitance 500 mv pk-pk temperature coef? cient at all outputs 0.02 % of vnom./c maximum capacitive loading full resistive load 0 1620 f power good signal characteristics ? ? output voltage for pgood triggering 50 55 v power good high state voltage 5v power good high state current (into pin) 10 a power good low state voltage 0.8 v power good low state current (into pin) 2.5 ma mechanical outline dimensions 2.60x 0.69 x 1.25 inches 66x 17.5 x 31.75 mm weight 2.2 ounces 62 grams through hole pin diameter 0.025*0.025 inches 0.64*0.64 mm through hole pin material copper alloy th pin plating metal and thickness nickel subplate 3-7.6 m tin overplate 2.54-7.6 m functional specifications (cont.) www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 3 of 13
notes ? typical at ta = +25c under nominal line voltage and nominal-load conditions, unless noted. ? devices have no minimum-load requirements and will regulate under no-load conditions. ? external capacitance could be all ceramic or a mix of electrolytic and ceramic. ? a) period between vin connection and vout rising to 10% of ? nal value when enable signal is exist- ing, or b) period between enable signal connection and vout rising to 10% of ? nal value when vin is existing. ? the output rise time measured from 10% of vnom to the lower limit of the regulation band with 0% to 100% load and external cap. ? the power supply will start up normally and without any demage under a pre-bias output voltage. ? tested under all loading conditions. ? tested under all loading conditions. ? pgood is referenced to vin(-). an external pull-up resistor is connected between pgood pin and a bias voltage. a high signal shown in the pin represents the good status of the output voltage. ? tested under full operating temperature and input voltage ranges. environmental operating ambient temperature range no derating, full power, 100 lfm, vertical mount -40 80 c storage temperature vin = zero (no power) -55 125 c thermal protection/shutdown 130 c available ari? ow io = 4.44a, ta = 25c 100 lfm electromagnetic interference (emi) conducted, en55022/cispr22 external ? lter required b class radiated, en55022/cispr22 b class relative humidity, operating, non-condensing 10 90 % relative humidity, non-operating, non- condensing 595% altitude (without output derating at 70c) 4000 10,000 feet rohs rating rohs-6 functional specifications (cont.) www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 4 of 13
performance data and oscillograms ef? ciency vs. line voltage and load current @ ta = +25c vin startup delay, vin = 12v, iout = 0a, channel #3 = 5v/div - vin, channel #4 = 20v/div - vout, ta = 25c, cload = 1620f vin startup delay, vin = 12v, iout = 0a, channel #3 = 5v/div - vin, channel #4 = 20v/div - vout, ta = 25c, cload = 100f vin startup delay, vin = 12v, iout = 4.44a, channel #3 = 5v/div - vin, channel #4 = 20v/div - vout, ta = 25c, cload = 1620f vin startup delay, vin = 12v, iout = 4.44a, channel #3 = 5v/div - vin, channel #4 = 20v/div - vout, ta = 25c, cload = 100f 70 75 80 85 90 95 100 load current (a) ef?ciency (%) vin = 11v vin = 12v vin = 13.2v www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 5 of 13
performance data and oscillograms output ripple & noise, vin = 12v, iout = 0a, ta = 25c, cload = 100f, bw = 20mhz output ripple & noise, vin = 12v, iout = 4.44a, ta = 25c, cload = 100f, bw = 20mhz www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 6 of 13
performance data and oscillograms maximum current temperature derating (vin = 11v, air? ow from vout to vin) maximum current temperature derating (vin = 12v, air? ow from vout to vin) maximum current temperature derating (vin = 13.2v, air? ow from vout to vin) maximum current temperature derating (vin = 11v, air? ow from vin to vout) maximum current temperature derating (vin = 12v, air? ow from vin to vout) maximum current temperature derating (vin = 13.2v, air? ow from vin to vout) 0 1 2 3 4 5 30 35 40 45 50 55 60 65 70 75 80 85 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 2.5 m/s (500 lfm) 3.0 m/s (600 lfm) output current (amps) ambient temperature (c) 0 1 2 3 4 5 30 35 40 45 50 55 60 65 70 75 80 85 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 2.5 m/s (500 lfm) 3.0 m/s (600 lfm) output current (amps) ambient temperature (c) 0 1 2 3 4 5 30 35 40 45 50 55 60 65 70 75 80 85 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 2.5 m/s (500 lfm) 3.0 m/s (600 lfm) output current (amps) ambient temperature (c) 0 1 2 3 4 5 30 35 40 45 50 55 60 65 70 75 80 85 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 2.5 m/s (500 lfm) 3.0 m/s (600 lfm) output current (amps) ambient temperature (c) 1 2 3 4 5 30 35 40 45 50 55 60 65 70 75 80 85 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 2.5 m/s (500 lfm) 3.0 m/s (600 lfm) output current (amps) ambient temperature (c) 0 1 2 3 4 5 30 35 40 45 50 55 60 65 70 75 80 85 0.5 m/s (100 lfm) 1.0 m/s (200 lfm) 1.5 m/s (300 lfm) 2.0 m/s (400 lfm) 2.5 m/s (500 lfm) 3.0 m/s (600 lfm) output current (amps) ambient temperature (c) www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 7 of 13
mechanical specifications third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 2? 1.25 2.6 (66.0) (31.8) 2.64 (67.06) 0.100 (2.54) 2.49 (63.2) 2.49 (63.2) recommended footprint 0.100 (2.54) 1.300 (33.02) 0.350 (8.89) 0.350 (8.89) 0.300 (7.62) 0.270 (6.86) 0.055 (1.39) pin 18 pin 19 pin 1 pin 14 pin 15 pin 20 18x 0.045 (1.14) 0.205 (5.21) 0.05 (1.27) 0.270 (6.86) 0.35 (8.89) 0.69 (17.53) 0.125 (3.18) 2x 0.075 (1.91) 0.045 typ 18pl 0.110 (2.79) 0.070 (1.78) 0.205 (5.21) 0.050 (1.27) 0.115 0.010 (2.920.254) 0.025 (0.64) 0.354 (8.99) max 0.69 (17.53) max input/output connections pin function 1 thot1_mcu(+) 2 thot2_mcu(-) 3 pgood 4 enable 5 vin(-) 6 vin(-) 7 vin(-) 8 vin(-) 9 vin(-) 10 vin(+) 11 vin(+) 12 vin(+) 13 vin(+) 14 vin(+) 15 -54vout 16 -54vout 17 -54v rtn 18 -54v rtn 19 support#1 20 support#2 inches (mm) www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 8 of 13
inches (mm) www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 9 of 13 shipping trays and boxes solutions ps sensitivedevices electrostatic o bserv e preca u tions for handing attention 13.78 (350) 12.6 (320) 11.42 (290) murata power solutions murata ps sensitivedevices electrostatic observe precautions for handing attention 10.94 (278) 10.16 (258) 4.33 (110) two boxes per carton, each containing 4 trays with 10 pcs per tray moq = 80 pcs third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 2?
technical notes i/o filtering and noise reduction the spc is tested and speci? ed with external output capacitors. these capacitors are necessary to accommodate our test equipment and may not be required to achieve desired performance in your application. the spc is designed with high-quality, high-performance internal i/o caps, and will oper- ate within spec in most applications with no additional external components . in particular, the spc input capacitors are speci? ed for low esr and are fully rated to handle the units' input ripple currents. similarly, the internal output capacitors are speci? ed for low esr and full-range frequency response. in critical applications, input/output ripple/noise may be further reduced using ? ltering techniques, the simplest being the installation of external i/o caps. external input capacitors serve primarily as energy-storage devices. they minimize high-frequency variations in input voltage (usually caused by ir drops in conductors leading to the dc/dc) as the switching converter draws pulses of current. input capacitors should be selected for bulk capacitance (at appropriate frequencies), low esr, and high rms-ripple-current ratings. the switching nature of modern dc/dc's requires that the dc input voltage source have low ac impedance at the frequencies of interest. highly inductive source impedances can greatly affect system stability. your speci? c system con? guration may necessitate additional considerations. input fusing most applications and or safety agencies require the installation of fuses at the inputs of power conversion components. the spc series may have an optional input fuse. therefore, if input fusing is mandatory, either a normal- blow or a fast-blow fuse with a value no greater than twice the maximum input current should be installed within the ungrounded input path to the converter. input overvoltage and reverse-polarity protection the spc does not incorporate input reverse-polarity protection. input voltages in excess of the speci? ed absolute maximum ratings and input polarity rever- sals of longer than "instantaneous" duration can cause permanent damage to these devices. start-up time the v in to v out start-up time is the interval between the time at which a rising input voltage crosses the lower limit of the speci? ed input voltage range c in v in c bus l bus c in = 33f, esr < 700m 7 @ 100khz c bus = 220f, esr < 100m 7 @ 100khz l bus = 12h +input common current probe to oscilloscope + ? figure 1. measuring input ripple current and the fully loaded output voltage enters and remains within its speci? ed regulation band. actual measured times will vary with input source imped- ance, external input capacitance, and the slew rate and ? nal value of the input voltage as it appears to the converter. the on/off to v out start-up time assumes the converter is turned off via the on/off control with the nominal input voltage already applied to the converter. the speci? cation de? nes the interval between the time at which the converter is turned on and the fully loaded output voltage enters and remains within its speci? ed regulation band. thermal considerations and thermal protection the typical output-current thermal-derating curves shown below enable designers to determine how much current they can reliably derive from each model of the spc under known ambient-temperature and air-? ow conditions. similarly, the curves indicate how much air ? ow is required to reliably deliver a speci? c output current at known temperatures. the highest temperatures in spc's occur at their output inductor, whose heat is generated primarily by i 2 r losses. the derating curves were developed using thermocouples to monitor the inductor temperature and varying the load to keep that temperature below +110c under the assorted conditions of air ? ow and air temperature. once the temperature exceeds +125c (approx.), the thermal protection will disable the converter using the hiccup shutdown mode. undervoltage shutdown when the input voltage falls below the undervoltage threshold, the converter will terminate its output. however, this is not a latching shutdown mode. as soon as the input voltage rises above the start-up threshold, the converter will restore normal operation. this small amount of hysteresis prevents most uncommanded power cycling. since some input sources with higher output impedance will increase their output voltage greater than this hysteresis as soon as the load is removed, it is possible for this undervoltage shutdown to cycle inde? nitely. to prevent this, be sure that the input supply always has adequate voltage at full load. thermal shutdown extended operation at excessive temperature will initiate overtemperature shutdown triggered by a temperature sensor inside the pwm controller. this operates similarly to overcurrent and short circuit mode. the inception point of the overtemperature condition depends on the average power delivered, the ambient temperature and the extent of forced cooling air? ow. remote on/off control the spc may be turned off or on using the external remote on/off control. this terminal consists of a digital input to the internal pwm controller through a protective resistor and diode. the on/off input circuit should be cmos logic referred to the Cinput power terminal however ttl or ttl-ls logic will also work or a switch to ground. if preferred, you can even run this using a bipolar transistor in open collector con? guration or an open drain fet transistor. www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 10 of 13
power good the power supply shall provide an open-drain/open-collector type circuit representing that the output voltage is within the required voltage band. an external pull-up resistor will be placed between the pgood pin and a bias voltage. the signal is referenced to the vin(-). the signal shall go to the high state when output voltage reaches a typical value, and returns to the low state when the output voltage falls below 50v. hottest component temperature indicating signal the following schematic shall be implemented close to the hottest compo- nent. a signal type npn transistor such as mmbt3904lt1, or a compatible part is recommended: the base-emitter voltage will change with a negative thermal coef? cient over the temperature. the circuit connected to this device is referenced to the vin(-). figure 2. external circuit con? guration for pgood signal + vx v pgood i ibc r 3.3 v vx 5.0 v 2.0 k r10.0 k figure 3. temperature sensing circuit thot_mcu( \ ) thot_mcu(+) www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 11 of 13 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. be cautious when there is high atmospheric humidity. we strongly recommend a mild pre-ba ke (100 c. for 30 minutes). your production environment may differ; therefore please thoroughly review these guidelines 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
emissions performance murata power solutions measures its products for conducted 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 hewlett packard hp8594l spectrum analyzer C s/n 3827a00153 2line v-networks ls1-15v 50/50uh line impedance stabilization network reference part number description vendor c1 ekzm250ess331mhb5d aluminum electrolytic capacitor 25v 330f 20% nippon chemicon c2 GRM31CR71E106KA12 smd ceramic 25v 10f 10% 1206 murata c3 grm219r71e104ka01 smd ceramic 25v 0.1f 10% 0805 murata c4 eky-101ess221mk25s aluminum electrolytic capacitor 100v 220f 20% nippon chemicon c5, c8 grm31cr72a225ka73 smd ceramic 100v 2.2f 10% 1206 murata c6, c7, c10, c11 de2f3ky103ma3bm02 ceramic capacitor cap y2/x1 cd 250vac 2200pf m e vi 7.5 murata c9 eky-101ess101mk16s aluminum electrolytic capacitor 100v 100f 20% nippon chemicon cm c20200-13 emi ? lter common choke minimum 5mh 8.9a itg- electronics c11 10n 5mh 54v+ po e 54v- 54v- c7 10n c5 2.2 p1 s1 tx1 c2 10 12/54v dc/d c murata power solutions vout_n vout_p vin_ n vin_p c1 330 c3 100n c4 220 c6 10n c8 2.2 54v+ +12v 54v+ c9 100 54v- po e c10 10n figure 4. conducted emissions test circuit [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 gean-02 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. www.murata-ps.com/support spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 12 of 13 graph 1. conducted emissions performance, cispr 22, class b, full load
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 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 collimator 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 4. vertical wind tunnel 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. ? 2016 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/ spc-54/4.4-l12pg-c 240w poe+ regulated converter mdc_spc-54/4.4-l12pg-c.a03 page 13 of 13

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