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www.murata-ps.com www.murata-ps.com/support for full details go to www.murata-ps.com/rohs $ emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 1 of 15 the emh-54/3-q48n-c module offers 54v output at 3 amps in a half brick footprint dc/dc power converter. these compact modules measure 2.4? x 2.3? x 0.5? (61 x 58.4 x 12.7 mm) with baseplate and offer the industry-standard half-brick footprint. the product is designed to fully comply with rohs-6 directive. the modules offer wide range input voltage of 18-72v. the emh topology offers high ef? ciency up to 91.5%, good regulation, low ripple/noise, and a fast dynamic load response. the module sup- plies up to 162 watts of power and isolation rated at 2250v for basic insulation. emh models are designed for demanding telecom, poe (power over ethernet), datacom, and networking applications. emhs feature input ? lters, input under voltage, output current limiting, short-circuit protection, and thermal shutdown. product overview typical units features ? industry-standard half-brick footprint ? 162w output power @ 24-72vin ? up to 91.5% ef? ciency at 54v output (typical) ? on/off control (negative logic) ? monotonic startup into pre-bias output conditions ? over-current, output & over-temperature protection ? low output ripple and noise ? strong thermal derating characteristics ? operational temperature range C40c to +85c with baseplate ? 2250v i/o isolation ? output short-circuit protection (hiccup technique) t yp ical units ordering guide summary model vout range iout range vin range ripple/noise ef? ciency emh-54/3-q48 54v 0.2-3a 18-72v 250mvp-p 91.5% input characteristics parameter typ. @ 25c, full load notes voltage range 18-72 volts 48v nominal input current, full power 3.67 amps vin = 48v turn on/start-up threshold 17.5 volts undervoltage shutdown 17 volts no load input current 40ma vin = 48v output characteristics parameter typ. @ 25c, full load notes voltage 54 volts 2% current 0.2 to 3 amps 0.2a min load required power output 162 watts ripple & noise 250mvp-p 20mhz bandwidth line and load regulation 0.125%/0.2% overcurrent protection 4 amps with hiccup auto-restart overtemperature protection +135c ef? ciency (minimum) 89.5% ef? ciency (typical) 91.5% general specifications parameter typ. @ 25c, full load notes dynamic load response 300sec 50-75-50% step to 1 of ? nal value operating temperature range C40 to +85c with baseplate, see derating curve absolute operating temperature range C40 to +105c measured at thermistor, see derating safety features ul 60950-1, 2nd edition csa-c22.2 no.60950-1 and iec/en60950-1 (pending) physical specifications parameter inches millimeters open frame (no baseplate) 2.4 x 2.3 x 0.43 61 x 58.4 x 10.92 with baseplate 2.4 x 2.3 x 0.5 61.0 x 58.4 x 12.7
www.murata-ps.com/support part number structure emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 2 of 15 performance specifications summary and ordering guide root model ? output input efficiency dimensions with baseplate (inches) 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) i in , full load (amps) (watts) typ. max. line load min. typ. emh-54/3-q48 54 3 162 250 350 0.125% 0.2% 48 18-72 40 3.67 89.5% 91.5% 2.4x2.3x0.5 nominal output voltage 54 emh 3 - / q48 maximum output current in amps ethernet-module half brick series - n b input voltage range: q48 = 18-72 volts (48v nominal) - c rohs hazardous materials compliance c = rohs-6 (no lead), standard, does not claim eu exemption 7b C lead in solder note: some model combinations may not be available. contact murata power solutions for availability. on/off control logic n = negative logic, standard baseplate blank = no baseplate, standard b = baseplate installed ? please refer to the full part number structure for additional ordering part numbers and options. ? all speci? cations are typical at nominal line voltage and full load, +25oc. unless otherwise noted. units are tested with a 1uf ceramic external output capacitor and a 100uf and 2.2uf external input capacitor. ? full power continuous output requires baseplate installation. please refer to the derating curves. 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
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 3 of 15 functional specifications absolute maximum ratings conditions ? minimum typical/nominal maximum units input voltage, continuous full power operation 0 72 vdc isolation voltage input to output tested 2250 vdc input reverse polarity none, install external fuse none vdc on/off remote control power on or off, referred to -vin 0 15 vdc output power 0 164.32 w output current current-limited, no damage, short-circuit protected 0.2 3 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 ? 18 48 72 vdc turn on/start-up threshold rising input voltage 16.5 17.5 18 vdc ambient temperature > 60c 19 vdc turn off/undervoltage lockout tested at 2.6a 15 17 17.5 vdc turn-on/turn-off hysteresis 1.0 1.05 1.2 vdc reverse polarity protection none, install external fuse none vdc recommended external fuse fast blow 20 a internal filter type l-c input current full load conditions vin = nominal 3.67 3.83 a low line input current vin @ min. @2.6a 8.52 8.84 a inrush transient 0.1 a 2 -sec. short circuit input current 250 350 ma no load input current iout = minimum, unit=on 40 80 ma shutdown mode input current (off, uv, ot) 510ma re? ected (back) ripple current ? measured at input with speci? ed ? lter 40 80 ma, p-p general and safety ef? ciency vin = 48v, full load 89.5 91.5 % vin = 24v, full load 89.5 91.5 % vin = 18v, full load 89.5 91 % isolation isolation voltage: no baseplate input to output, continuous 2250 vdc isolation voltage: with baseplate input to output, continuous 2250 vdc input to baseplate, continuous 1500 output to baseplate, continuous 750 insulation safety rating basic isolation resistance 100 mohm isolation capacitance 5,000 pf safety (designed to meet the following requirements) 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=+25c 1.8+ hours x 10 6 dynamic characteristics fixed switching frequency 387 430 473 khz startup time power on to vout regulated 10-90% (50% resistive load) 40 60 ms startup time remote on to 10% vout (50% resistive load) 30 50 ms dynamic load response 50-75-50% load step, settling time to within 2% of vout 300 450 sec dynamic load peak deviation same as above 1000 1250 mv features and options remote on/off control ? n suf? x: negative logic, on state on = pin grounded or external voltage -0.7 0.8 v negative logic, off state off = pin open or external voltage 5 15 v control current open collector/drain 1 2 ma base plate b suf? x
www.murata-ps.com/support notes ? unless otherwise noted, all speci? cations are at nominal input voltage, nominal output voltage and full load. general conditions are +25 celsius ambient temperature, near sea level altitude, natural convection air? ow. all models are tested and speci? ed with an external 1 f multi-layer ceramic output capacitor. the external input capacitors are 100uf and 2.2uf ceramic. all capaci- tors 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. ? the module will operate when input voltage is within the 18-72v operating voltage range. output regulation at full load will be achieved only when vin 18v. ? input (back) ripple current is tested and speci? ed over 5 hz to 20 mhz bandwidth. input ? ltering is cbus = 220 f, cin = 33 f and lbus = 12 f. ? the remote on/off control is referred to -vin. ? over-current protection is non-latching with auto reovery (hiccup) ? 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. emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 4 of 15 output total output power see derating 0.0 161.1 164.32 w voltage nominal output voltage no trim 52.626 53.7 54.774 vdc setting accuracy at 50% load -2 2 % of vnom. output voltage range user-adjustable ? n/a % of vnom. overvoltage protection via magnetic feedback 65 67 vdc current output current range: 24-72 vin 0.2 3 3 a output current range: 18-24 vin 0.2 2.6 2.6 a minimum load 0.2 current limit inception ? 98% of vnom., after warmup 3.2 3.9 4.7 a short circuit short circuit current hiccup technique, autorecovery within 1% of vout, non-latching 0.5 1 a short circuit duration (remove short for recovery) output shorted to ground, no damage continuous short circuit protection method current limiting regulation ? line regulation vin=min. to max. vout=nom., 50% load 0.125 % load regulation iout=min. to max. vin=48v. 0.2 % ripple and noise 5 hz- 20 mhz bw 250 350 mv pk-pk temperature coef? cient at all outputs 0.02 % of vnom./c maximum capacitive loading low esr, resistive load 0 3300 f mechanical (through hole models) outline dimensions (open frame) 2.4 x 2.3 x 0.43 inches 61.0 x 58.4 x 10.92 mm outline dimensions (with baseplate) 2.4 x 2.3 x 0.5 inches lxwxh (please refer to outline drawing) 61.0 x 58.4 x 12.7 mm weight (with baseplate) 2.3 ounces 67.13 grams through hole pin diameter see mechanical drawing 0.04 & 0.080 inches 1.016 & 2.032 mm through hole pin material copper alloy th pin plating metal and thickness nickel subplate 50 -inches gold overplate 5 -inches case or baseplate material aluminum environmental operating ambient temperature range with derating -40 85 c operating ambient temperature range with baseplate maximum baseplate temperature: converter deliv- ers full rated power at max baseplate temp. -40 100 c absolute operating temperature range measured @ thermistor or in the middle of baseplate -40 105 storage temperature vin = zero (no power) -40 125 c thermal protection/shutdown 125 135 140 c electromagnetic interference conducted, en55022/cispr22 external ? lter required b class radiated, en55022/cispr22 b class rohs rating rohs-6 functional specifications (cont.)
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 5 of 15 typical performance data maximum current temperature derating vs. air? ow (vin = 24v, air? ow from from pin 1 to pin 4 on pcb, no baseplate) maximum current temperature derating vs. air? ow (vin = 48v, air? ow from from pin 1 to pin 4 on pcb, no baseplate) maximum current temperature derating vs. air? ow (vin = 72v, air? ow from from pin 1 to pin 4 on pcb, no baseplate) maximum current temperature derating vs. air? ow (vin = 18, air? ow from pin 1 to pin 4 on pcb, no baseplate) maximum current temperature derating vs. air? ow (vin = 36, air? ow from pin 1 to pin 4 on pcb, no baseplate) maximum current temperature derating vs. air? ow (vin = 60, air? ow from pin 1 to pin 4 on pcb, no baseplate) 0 1 2 3 4 3 0 3 5 4 0 4 5 5 0 5 5 6 0 6 5 7 0 7 5 8 0 8 5 0.33 m / s (65 lfm ) 0.5 m / s ( 100 lfm ) 1.0 m / s (200 lfm ) 1.5 m / s ( 300 lfm ) 2.0 m / s (400 lfm ) o utput current (amps) amb i ent tem p eratur e ( c) 0 1 2 3 4 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput current (amps) ambient tem p eratur e ( c ) 0.33 m/s (65 lfm ) 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 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput current (amps) amb i ent temperatur e ( c) 0.33 m/s (65 lfm ) 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 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput c urrent (amps) amb i ent temperatur e ( c) 0.33 m / s (65 lfm ) 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 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput c urrent (amps) ambient tem p eratur e ( c ) 0.33 m / s (65 lfm ) 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 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput c urrent (amps) amb i ent temperatur e ( c) 0.33 m / s ( 65 lfm ) 0.5 m/s ( 100 lfm ) 1 .0 m / s (200 lfm ) 1 .5 m/s ( 300 lfm ) 2.0 m / s ( 400 lfm )
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 6 of 15 typical performance data maximum current temperature derating vs. air? ow (vin = 24v, air? ow from from pin 1 to pin 4 on pcb, with baseplate) maximum current temperature derating vs. air? ow (vin = 48v, air? ow from from pin 1 to pin 4 on pcb, with baseplate) maximum current temperature derating vs. air? ow (vin = 72v, air? ow from from pin 1 to pin 4 on pcb, with baseplate) maximum current temperature derating vs. air? ow (vin = 18, air? ow from pin 1 to pin 4 on pcb, with baseplate) maximum current temperature derating vs. air? ow (vin = 36, air? ow from pin 1 to pin 4 on pcb, with baseplate) maximum current temperature derating vs. air? ow (vin = 60, air? ow from pin 1 to pin 4 on pcb, with baseplate) 0 1 2 3 4 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput current (amps) amb i ent temperatur e ( c) 0.33 m / s (65 lfm ) 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 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput current (amps) ambient tem p eratur e ( c ) 0.33 m / s (65 lfm ) 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 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput current (amps) amb i ent temperatur e ( c) 0 .33 m / s ( 65 lfm ) 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 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput c urrent (amps) amb i ent temperatur e ( c) 0 .33 m / s ( 65 lfm ) 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 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput c urrent (amps) ambient tem p eratur e ( c ) 0.33 m / s (65 lfm ) 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 30 3 5 40 45 50 55 60 6 5 70 75 80 85 o utput c urrent (amps) amb i ent temperatur e ( c) 0 .33 m / s ( 65 lfm ) 0 .5 m / s ( 100 lfm ) 1 .0 m/s (200 lfm ) 1 .5 m / s (300 lfm ) 2 .0 m/s ( 400 lfm )
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 7 of 15 typical performance data startup delay (vin=48v, iout=3a, ta=+25c) trace 1=vin, trace 4=vout. stepload transient response (vin=48v, iout =50-75-50%, ta=+25c) output ripple and noise (vin=48v, vout=nom, iout=3a, cload=1uf, ta=+25c) ef? ciency vs line voltage and load current @ +25c on/off enable delay (vin=48v, iout=3a, ta=+25c) trace 1=enable, trace 4=vout. output ripple and noise (vin=48v, vout=nom, iout=0a, cload=1uf, ta=+25c) 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 ef?ciency (%) load current (amps) vin = 18v vin = 24v vin = 36v vin = 48v vin = 60v vin = 75v
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 8 of 15 typical performance data thermal image with hot spot at 2.9a with 25c 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, t3 and q12 max temp=128c/ipc9592 guidelines.
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 9 of 15 mechanical specifications C open frame 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? input/output connections pin function 1 negative input 2 omitted 3 remote on/off 4 positive input 5 positive output 6 omitted 7 omitted 8 omitted 9 negative output 2.40 [60.96] mounting plane (pin shoulders) 0.95 [24.1] 0.700 [17.78] 0.700 [17.78] 0.300 [7.62] side view c l 1 3 4 3x .040 pins 1, 3 & 4 2x .080 pins 5 & 9 9 5 bottom view c l 1.400 [35.56] end view top view 2.300 [58.42] 0.43 [10.92] 1.900 [48.26] material: finish: (all pins) .080 pins: copper alloy .040 pins: copper alloy finish: (all pins) gold (5umin) over nickel (50u min)
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 10 of 15 mechanical specifications C with baseplate 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? input/output connections pin function 1 negative input 2 omitted 3 remote on/off 4 positive input 5 positive output 6 omitted 7 omitted 8 omitted 9 negative output 0.700 [17.78] 0.300 [7.62] 0.5.015 [12.70.38] 0.015 [.381] min clearance isometric view pin 1 side view aluminum baseplate gold (5u"min) over nickel (50u" min) finish: (all pins) .080 pins: copper alloy .040 pins: copper alloy material: c l pin 4 pin 1 pin 5 bottom view pin 3 pin 9 c l 1.400 [35.56] end view mtg plane (pins 5 & 9) 0.080.002 0.040.002 (pins 1, 3-4) 0.071 .002 vented shoulder at each top view 0.25 min deep (4 pls) 1.900 [48.26] 1.900 [48.26] 0.112-40-unc-2b 2.000 [50.8] 2.40 [61.0] 2.30 [58.4] 0.95 [24.1]
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 11 of 15 recommended footprint standard packaging 0.150min @5 & 9 for pin shoulders 0.100 min @ 1, 3, and 4 for pin shoulders top view c l (pri) c l 1 3 9 5 (sec) c l .088-.102 (per ipc-d-275, level c) @ pins 5 & 9 finished hole sizes finished hole sizes @ pins 1, 3 and 4 (per ipc-d-275, level c) 0.048-.062 4 0.300 [7.62] 1.900 [48.26] [2.32] 0.091 [2.42] 0.095 [0.950] 0.037 [0.700] 0.027 10" x 10" x 4.25" carton inside dimensions: each static dissipative polyethylene foam tray accommodates 9 converters in a 3 x 3 array (4 trays of 9)
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 12 of 15 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, i.e. iec/en/ul 60950-1. 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 ramping-up 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 opera- tion at a single input voltage. users should be aware however of input sources near the under-voltage shutdown whose voltage decays as input current is consumed (such as capac- itor inputs), the converter shuts off and then restarts as the external capacitor recharges. 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 time assuming that the output current is set at the rated maximum, the vin to vout start-up time (see speci? cations) is the time interval between the point when the ramping input voltage crosses the start-up threshold and the fully loaded regulated output voltage enters and remains within its speci? ed accuracy band. actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and ? nal value of the input voltage as it appears at the converter. these converters include a soft start circuit, which limits the duty cycle of the pwm controller at power up, thereby limiting the input inrush current. the on/off remote control interval from on command to vout 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 command until the output enters and remains within its speci? ed accuracy band. the speci? cation assumes that the output is fully loaded at maximum rated current. similar conditions apply to the on to vout regulated speci? cation such as external load capacitance and soft start circuitry. input source impedance these converters will operate to speci? cations without external components, assuming that the source voltage has very low impedance and reason- able input voltage regulation. since real-world voltage sources have ? nite impedance, performance is improved by adding external ? lter components. technical notes sometimes only a small ceramic 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. 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 capacitors (cin 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 frequen- cies), low esr and high rms ripple current ratings. in the ? gure below, the cbus and lbus components simulate a typical dc voltage bus. your speci? c system con? guration may require additional considerations. please note that the values of cin, lbus and cbus will 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 tem- perature rise from re? ected ac current dissipated inside capacitor esr. our application engineers can recommend potential solutions. 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 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. c in v in c bus l bus c in = 33f, esr < 700m @ 100khz c bus = 220f, esr < 100m @ 100khz l bus = 12h +input -input current probe to oscilloscope + C + C figure 1. measuring input ripple current
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 13 of 15 thermal shutdown to prevent many over temperature problems and damage, these converters include thermal shutdown circuitry. if environmental conditions cause the temperature 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. the temperature sensor is typically located adjacent to the switching controller, approximately in the center of the unit. see the performance and functional speci? cations. caution: if you operate too close to the thermal limits, the converter may shut down suddenly without warning. be sure to thoroughly test your applica- tion to avoid unplanned thermal shutdown. temperature derating curves the graphs in this data sheet illustrate typical operation under a variety of conditions. 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 aver- age 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 very low ? ow rates are similar to natural convection, that is, not using fan-forced air? ow. murata power solutions makes characterization measurements in a closed loop wind tunnel with measured air? ow. we use both thermocouples and an infrared camera system to observe thermal performance. if in doubt, contact murata power solutions to discuss placement and measurement techniques of suggested temperature sensors. caution: if you routinely or accidentally exceed these derating guidelines, the converter may have an unplanned over temperature shut down. also, these graphs are all collected at slightly above sea level altitude. be sure to reduce the derating for higher density altitude. output overvoltage protection this converter monitors its output voltage for an over-voltage condition using an on-board electronic comparator. 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 output application circuit may need additional protec- tion. in the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. consider using an appropriate fuse in series with the output. output current limiting as soon as the output current increases to its maximum rated value, the dc/dc converter will enter a power-limiting mode. the output voltage will decrease proportionally with increases in output current, thereby maintaining a some- what constant power output. this is commonly referred to as power limiting. current limiting inception is de? ned as the point at which full power falls below the rated tolerance. see the performance/functional speci? cations. note particularly that the output current may brie? y rise above its rated value. this enhances reliability and continued operation of your application. if the output current is too high, the converter will enter the short circuit condition. output short circuit condition when a converter is in power-limit mode, the output voltage will drop as the output current demand increases. if the output voltage drops too low, the mag- netically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the pwm controller. following a time-out period, the pwm will restart, causing the output voltage to begin ramping up to its appro- priate value. if the short-circuit condition persists, another shutdown cycle will initiate. this on/off cycling is called hiccup mode. the hiccup cycling reduces the average output current, thereby preventing excessive internal tempera- tures. a short circuit can be tolerated inde? nitely. remote on/off control negative: optional negative-logic devices are on (enabled) when the on/off is grounded or brought to within a low voltage (see speci? cations) with respect to Cvin. the device is off (disabled) when the on/off is pulled high to +vin with respect to Cvin. dynamic control of the on/off function should be able to sink appropriate signal current when brought low and withstand appropriate 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). caution: do not apply voltages to the on/off pin when there is no input voltage. otherwise the converter may be permanently damaged. figure 2. measuring output ripple and noise (pard) c1 c1 = 1f ceramic load 2-3 inches (51-76mm) from module r load 5 scope +output 9 -output
www.murata-ps.com/support emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 14 of 15 power over ethernet (poe) power over ethernet (poe) supports the implementation of the ieee 802.3af and ieee 802.3at standards; this implementation allows both data and electrical power to pass over a copper ethernet lan cable. poe permits electric power, along with data, to be passed over a copper ethernet lan cable. powered devices, such as voice-over-ip telephones, wireless access points, video cam- eras, and point-of-sale devices, that support poe can receive power safely from the access ports that are used to connect personal computers to the network. ieee 802.3at increases the amount of power to 30w. the poe standard provides support for legacy poe devices. an ieee 802.af powered device can operate normally when connected to ieee 802.at power sourcing equipment. figure 3. driving the negative logic on/off control pin 1 3 4 on/off control -input +input +vcc soldering guidelines murata power solutions recommends the speci? cations below when installing these converters. these speci? cations vary depending on the solder type. exceeding these speci? cations may cause damage to the product. be cautious when there is high atmo- spheric humidity. we strongly recommend a mild pre-bake (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 standard class maximum power delivered by poe port power range of powered device ieee 802.3af (poe) and ieee 802.3at (poe +) 0 15.4 w 0.44 through 12.95 w 1 4 w 0.44 through 3.84 w 2 7.0 w 3.84 through 6.49 w 3 15.4 w 6.49 through 12.95 w ieee 802.3at (poe+) 4 30.0 w 12.95 through 25.5 w table 1. class of powered device and power levels
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. ? 2012 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/ emh-54/3-q48n-c series isolated, 54vout, 3a, ethernet power half-brick dc/dc converters mdc_emh-54/3-q48n-c.a01 page 15 of 15 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 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 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 turbu- lence 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 differ- ent 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

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