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rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 1 of 15 www.murata-ps.com www.murata-ps.com/support for full details go to www.murata-ps.com/rohs $ figure 1. connection diagram typical topology is shown. murata power solutions recommends an external fuse at f1. features ? ? 240 watts total output power, ? xed12 vdc @ 20 a ? ? 94.5% ultra-high efficiency at full load with regula tion ? ? 36 to 75 volt dc input range (48 vdc nominal) ? ? standard eighth-brick footprint ? ? 0.4-inch (10.2 mm) low height (no baseplate) ? ? synchronous recti? er topology with 100 mv (typ.) ripple & noise ? ? up to +85 celsius thermal performance (with derating) ? ? stable no-load operation ? ? fully isolated to 2250 vdc (basic, no baseplate) ? ? remote on/off enable control ? ? extensive protection features C sc, oc, uvlo, ot ? ? certi? ed to safety, emissions and environmental standards ? ? meets ul 60950-1, can/csac22.2 no. 60950-1, iec60950-1, en60950-1 safety approvals (2nd edition) (pending) product overview the fully isolated (2250 vdc, no baseplate) rbe- 12/20-d48 series accept a 36 to 75 volt dc input voltage range (48 vdc nominal) and converts it to a ? xed 12vdc output. applications include 48v-pow- ered datacom and telecom installations, base stations, cellular dataphone repeaters, instruments and embedded systems. wideband output ripple and noise is a low 100 mv (typical), peak-to-peak. reduced open frame overall height of 0.4? (10.2 mm) ? ts tight card cages. the rbes regulated synchronous-recti? er topology and ? xed frequency operation means excellent ef? ciencies up to 94.5%, enabling no heatsink operation for most applications up to +85 celsius (see derating curves). no fan or zero air? ow higher temperature applications may use the optional base plate for cold plate mounting or natural-convection heatsinks. electronic protection features include input undervoltage lockout (uvlo) , output current limit, short circuit hiccup, and overtemperature shut- down. available options include positive or negative logic on/off control, conformal coating, various pin lengths, and the baseplate. assembled using iso-certi? ed automated surface-mount techniques, the rbe series is certi? ed to ul and iec safety standards. typical unit f1 external dc power source reference and error ampli?er t4xjudijoh t'jmufst t$vssfou4fotf -vout (4) +vout (8) on/off control (2) -vin (3) open = on $mptfe0gg +vin (1) 1ptjujwf mphjd
controller and power 5sbotgfs duty cycle 3fhvmbujpo *tpmbujpo barrier (pending)
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 2 of 15 www.murata-ps.com/support part number structure *special quantity order is required; no sample quantities available. note: some model number combinations may not be available. please contact murata power solutions. maximum rated output current in amps eighth-brick package isolated converter output con? guration: r = regulated nominal output voltage r be - / d48 - 12 20 n b input voltage range d48 = 36-75v, 48v nominal h performance specifications summary and ordering guide root model ? output input ef? ciency package v out (v) i out (a, max) total power (w) ripple & noise (mvp-p) regulation (max.) ? v in nom. (v) range (v) i in, min. load (ma) i in, full load (a) typ. line (%) load (%) min. typ. case (inches) case (mm) rbe-12/20-d48 11.7 20 234 100 2 3 48 36-75 80 5.16 91% 94.5% 2.3x0.9x0.4 58.4x22.9x10.16 ? please refer to the part number structure for additional options and complete ordering part numbers. ? line regulation is given as vin = 40v to 75v, iout = half load. load regulation is vin = 48v, iout = imin to imax. ? all speci? cations are at the full input voltage range, maximum load, and full temperature range unless otherwise noted. see d etailed speci? cations. output capacitors are 1 f in parallel with 10 f and 470f capacitor across the input pins. i/o caps are necessary for our test equipment and may not be needed for your application . conformal coating (optional) blank = no coating, standard h = coating added, optional* on/off control logic n = negative logic p = positive logic baseplate blank = no baseplate b = baseplate installed ( through-hole packages only) blank = standard pin length 0.180 inches (4.6mm) l1 = pin length 0.110 inches (2.79mm)* l2 = pin length 0.145 inches (3.68mm)* pin length option lx c rohs hazardous substance compliance (does not claim eu rohs exemption 7bClead in solder) c = rohs-6 -
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 3 of 15 www.murata-ps.com/support functional specifications absolute maximum ratings conditions ? minimum typical/nominal maximum units input voltage, continuous full power operation, full temperature range 0 80 vdc input voltage, transient operating or non-operating, tested: 100 ms max. duration 0 100 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 15 vdc output power 0 237.51 w output current current-limited, no damage, short-circuit protected 020a operating ambient temperature range with derating -40 85 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 conditions ? ? operating voltage range 36 48 75 vdc voltage transient (100ms duration) 100 vdc recommended external fuse fast blow 15 a start-up threshold rising input voltage 32 33 34 vdc undervoltage lockout falling input voltage 30 31 32 vdc reverse polarity protection none, install external fuse none vdc internal filter type pi input current full load conditions 5.16 5.44 a low line vin = minimum 6.99 7.33 a inrush transient vin = 48v 0.05 a 2 -sec. short circuit input current 150 800 ma no load input current iout = minimum, unit = on, vin = 48v 80 150 ma shut-down mode input current (off, uv, ot) 510ma re? ected (back) ripple current ? measured at input with speci? ed ? lter 70 200 ma, pk-pk pre-biased startup external voltage < vset 0 monotonic v general and safety ef? ciency vin = 48v 91 94.5 % vin = 75v 90 93 % isolation isolation voltage C no baseplate input to output, continuous 2250 vdc isolation voltage C with baseplate input to output, continuous 2250 vdc isolation voltage, input to baseplate 1500 vdc isolation voltage, output to baseplate 1500 vdc insulation safety rating basic isolation resistance 10 mohm isolation capacitance 1500 pf safety certi? ed to ul-60950-1, csa-c22.2 no.60950-1, iec/en60950-1, 2nd edition (pending) yes calculated mtbf per telcordia sr332, issue 2, method 1, class 1, gf tambient = +25c 2.1 hours x 10 6 dynamic characteristics fixed switching frequency 200 khz startup delay power on 10% vout to 90% vout (50% resistive load) 15 ms rise time remote on to 10% vout, vin = 48v (50% resistive load) 15 ms dynamic load response 50-75-50% load step, settling time to within 1% of vout. (48vin, 470uf output capacitance, 1a/us) 2000 sec dynamic load peak deviation same as above 600 mv features and options remote on/off control ? n suf? x: negative logic, on state on = ground pin or external voltage -0.1 0.8 v negative logic, off state off = pin open or external voltage 2.5 15 v control current sinking 1 2 ma p suf? x: positive logic, on state on = pin open or external voltage 3.5 15 v positive logic, off state off = ground pin or external voltage 0 1 v control current sinking 1 2 ma base plate b suf? x
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 4 of 15 www.murata-ps.com/support notes ? unless otherwise noted, all speci? cations apply over the full input voltage range, full temperature range, nominal output voltage and full output load. general conditions are near sea level altitude and natural convection air? ow unless noted. all models are tested and speci? ed with external parallel 1 f and 10 f output capacitors. a 470 f input capacitor is used across the input pins. all capacitors are low-esr types mounted close to the converter. these capacitors are necessary for our test equipment and may not be needed in the users application. ? input (back) ripple current is tested and speci? ed over 5 hz to 20 mhz bandwidth. input ? ltering is cbus = 220 f, cin = 33 f and lbus = 12 h. ? all models are stable and regulate to speci? cation under no load. ? reduction of hazardous substances (rohs) compliance is to rohs-6 (six substances restricted including lead). ? 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 remote on/off control is referred to -vin. ? please refer to the part number structure for complete ordering model numbers. output total output power see derating 0.0 234 237.51 w voltage nominal output voltage vin = 48v, half load. 1.5 accuracy 11.525 11.7 11.876 vdc total output voltage range over sample load (0-20a) and temperature (see derating curves) 10.5 12 12.5 vdc vout overshoot 13 13.4 vdc overvoltage protection output voltage clamped 13.5 vdc current output current range 02020a minimum load no minimum load current limit inception 90% of vnom., after warmup 24 28 38 a short circuit short circuit current hiccup technique, autorecovery within 1.25% of vout 410a short circuit duration (remove short for recovery) output shorted to ground, no damage continuous short circuit protection method current limiting regulation ? line regulation vin = 40 to 75v., vout = nom., 50% load 2 % load regulation iout = 0 to 100%, vin = 48v. 3 % ripple and noise 5 hz- 20 mhz bw 100 150 mv pk-pk temperature coef? cient at all outputs 0.02 % of vnom./c maximum capacitive loading cap. esr, full resistive load 470 4700 f mechanical (through hole models) conditions ? ? outline dimensions (no baseplate) lxwxh (please refer to outline drawing) 2.3x0.9x0.4 max. inches 58.42x22.86x10.16 mm outline dimensions (with baseplate) 2.3x0.9x0.5 inches 58.42x22.86x12.7 mm weight (no baseplate) 1.06 ounces 30 grams weight (with baseplate) 1.46 ounces 41.5 grams through hole pin diameter input pins (see drawings) 0.0400.001 inches 1.0160.025 mm through hole pin diameter output pins (see drawings) 0.0620.001 inches 1.5750.025 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 with derating, no condensation -40 85 c operating case temperature no derating required -40 120 c storage temperature vin = zero (no power) -55 125 c thermal protection/shutdown 115 125 130 c electromagnetic interference conducted, en55022/cispr22 external ? lter required b class radiated, en55022/cispr22 external ? lter required b class rohs rating ? rohs-6 functional specifications, continued
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 5 of 15 www.murata-ps.com/support typical performance data maximum current temperature derating at sea level in longitudinal direction vin= 48v (air ? ow direction is from vin to vout), no baseplate maximum current temperature derating at sea level in longitudinal direction vin= 36v (air ? ow direction is from vin to vout), no baseplate maximum current temperature derating at sea level in longitudinal direction vin= 75v (air ? ow direction is from vin to vout), no baseplate maximum current temperature derating at sea level in transverse direction vin= 48v (air ? ow direction is from vin- to vin+), no baseplate maximum current temperature derating at sea level in transverse direction vin= 36v (air ? ow direction is from vin- to vin+), no baseplate maximum current temperature derating at sea level in transverse direction vin= 75v (air ? ow direction is from vin- to vin+), no baseplate 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm)
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 6 of 15 www.murata-ps.com/support typical performance data maximum current temperature derating at sea level in longitudinal direction vin= 48v (air ? ow direction is from vin to vout), with baseplate maximum current temperature derating at sea level in longitudinal direction vin= 36v (air ? ow direction is from vin to vout), with baseplate maximum current temperature derating at sea level in longitudinal direction vin= 75v (air ? ow direction is from vin to vout), with baseplate maximum current temperature derating at sea level in transverse direction vin= 48v (air ? ow direction is from vin- to vin+), with baseplate maximum current temperature derating at sea level in transverse direction vin= 36v (air ? ow direction is from vin- to vin+), with baseplate maximum current temperature derating at sea level in transverse direction vin= 75v (air ? ow direction is from vin- to vin+), with baseplate 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm) 30 35 40 45 50 55 60 65 70 75 80 85 0 2 4 6 8 10 12 14 16 18 20 22 24 output current (amps) ambient temperature (oc) 2.0 m/s (400lfm) 1.5 m/s (300lfm) 1.0 m/s (200lfm) 0.5 m/s (100lfm)
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 7 of 15 www.murata-ps.com/support typical performance data start up delay (vin=48v, iout=0a, cload=470uf, ta=+25c) ch1=vin, ch2=vout start up delay (vin=48v, iout=20a, cload=4700uf, ta=+ 25c) ch1=vin, ch2=vout on/off enable start up (vin=48v, iout=20a, cload=4700uf, ta=+25c) ch2=vout, ch4=enable start up delay (vin=48v, iout=20a, cload=470uf, ta=+25c) ch1=vin, ch2=vout on/off enable start up (vin=48v, iout=20a, cload=470uf, ta=+25c) ch2=vout, ch4=enable on/off enable start up (vin=48v, iout=0a, cload=470uf, ta=+25c) ch2=vout, ch4=enable
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 8 of 15 www.murata-ps.com/support typical performance data ef? ciency vs. line voltage and load current @ 25c 70 75 80 85 90 95 100 0 5 10 15 20 25 load curre nt (amps) v in = 36v v in = 48v v in = 75v ef?ciency (%) thermal image with hot spot at full load current with 30c ambient; air is ? owing at 100 lfm. air is ? owing across the converter from -vin to +vin at 48v input. identi? able and recommended maximum value to be veri? ed in application. typical output voltage (vout) vs. input voltage (vin) at +25c typical output voltage (vout) vs. output load at +25c 10.4 10.6 10.8 11 11.2 11.4 11.6 11.8 12 1 2 3 4 5 6 7 8 9 1011121314151617181920 output voltage/vout load/a 36v 48v 75v 10.6 10.8 11.2 11.4 11.6 11.8 12.2 11 12 output voltage/vout input voltage/vin 10a 20a no load
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 9 of 15 www.murata-ps.com/support typical performance data typical startup waveform with a 4v bias voltage typical startup waveform with a 8v bias voltage output ripple and noise (vin = 48v, iout = 20a, cload = 4700f, ta = +25c) stepload transient response (vin = 48v, cload = 470 f, iout = 50-75-50% of imax, 1a/s, ta = +25c) output ripple and noise (vin = 48v, iout = 20a, cload = 1uf || 10f, ta = +25c) output ripple and noise (vin = 48v, iout = 0a, cload = 1uf || 10f, ta = +25c)
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 10 of 15 www.murata-ps.com/support mechanical specifications (through-hole mount) third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only and may vary between units. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 2? 2.000 50.80 2.000 50.80 open frame with baseplate option l l see note 6 see note 6 bottom pin side view bottom pin side view side view 1 2 3 0.600 15.24 8 4 0.900 22.86 0.600 15.24 2.30 58.4 2.30 58.4 1 2 3 0.600 15.24 8 4 0.900 22.86 0.600 15.24 pins 1-3,: 0.0400.0015(1.0160.038) pins 4,5: 0.0620.0015(1.5750.038) 0.005 minimum clearance between standoffs and highest component pins 1-3,: 0.0400.0015(1.0160.038) pins 4,5: 0.0620.0015(1.5750.038) 0.005 minimum clearance between standoffs and highest component 0.50 12.7 0.40 10.16 top view m3-6h typ 2pl input/output connections pin pin 1 +vin 4 -vout 2 remote on/off 8 +vout 3 -vin notes: unless otherwise specified; 1:m3 screw used to bolt units baseplate to other surfaces(such as heatsink) must not exceed 0.120(3.0mm) depth below the surface of baseplate 2:applied torque per screw should not exceed 5.3in-lb(0.6nm); 3:all dimension are in inches[milimeter]; 4:all tolerances: .in ,0.02in(.mm,0.5mm) .in ,0.01in(.mm,0.25mm) 5:component will vary between models 6:standard pin length: 0.180 inch 7: finish: (all pins) gold (5umin) over nickel (50u min) for l2 pin length option in model name., use standard l2 pin with pin length to 0.145 inch
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 11 of 15 www.murata-ps.com/support 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. thermal shutdown uses only the hiccup mode (autorestart). start up considerations when power is ? rst applied to the dc/dc converter, there is some risk of start up dif? culties if you do not have both low ac and dc impedance and adequate regula- tion of the input source. make sure that your source supply does not allow the instantaneous input voltage to go below the minimum voltage at all times. use a moderate size capacitor very close to the input terminals. you may need two or more parallel capacitors. a larger electrolytic or ceramic cap sup- plies the surge current and a smaller parallel low-esr ceramic cap gives low ac impedance. remember that the input current is carried both by the wiring and the ground plane return. make sure the ground plane uses adequate thickness copper. run additional bus wire if necessary. 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. 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. 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 rising input voltage crosses the start-up threshold and the fully loaded output voltage enters and remains within its speci? ed accuracy band. actual measured times will vary with input source impedance, external input capaci- tance, input voltage 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 its pwm controller at power up, thereby limiting the input inrush current. the on/off remote control interval from on command to vout (? nal 5%) 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 technical notes 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. recommended input filtering the user must assure that the input source has low ac impedance to provide dynamic stability and that the input supply has little or no inductive content, including long distributed wiring to a remote power supply. the converter will operate with no additional external capacitance if these conditions are met. for best performance, we recommend installing a low-esr capacitor imme- diately adjacent to the converters input terminals. the capacitor should be a ceramic type such as the murata grm32 series or a polymer type. make sure that the input terminals do not go below the undervoltage shutdown voltage at all times. more input bulk capacitance may be added in parallel if needed. recommended output filtering the converter will achieve its rated output ripple and noise with no additional external capacitor. however, the user may install more external output capacitance to reduce the ripple even further or for improved dynamic response. again, use low-esr ceramic (murata grm32 series) or polymer capacitors. mount these close to the converter. measure the output ripple under your load conditions. use only as much capacitance as required to achieve your ripple and noise objectives. excessive capacitance can make step load recovery sluggish or possibly introduce instability. do not exceed the maximum rated output capaci- tance listed in the speci? cations. 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 com- ponents, circuits and layout as shown in the ? gures below. the cbus and lbus components simulate a typical dc voltage bus. minimum output loading requirements 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. c in v in c bus l bus c in = 300f, esr < 700m @ 100khz c bus = tbdf, esr < 100m @ 100khz l bus = <500h +vin -vin current probe to oscilloscope + C + C figure 2. measuring input ripple current
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 12 of 15 www.murata-ps.com/support 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. 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 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 ? ow rates which are not using fan-forced air? ow. depending on the application, natural convection is usually 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 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 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 par- ticularly that the output current may brie? y rise above its rated value in normal operation as long as the average output power is not exceeded. 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 current-limit mode, the output voltage will drop as the output current demand increases. if the output voltage drops too low (approxi- mately 97% of nominal output voltage for most models), the pwm controller will shut down. following a time-out period, the pwm will restart, causing the output voltage to begin rising to its appropriate value. if the short-circuit condition persists, another shutdown cycle will initiate. this rapid on/off cycling is called hiccup mode. the hiccup cycling reduces the average output cur- rent, thereby preventing excessive internal temperatures and/or component damage. a short circuit can be tolerated inde? nitely. the hiccup system differs from older latching short circuit systems because you do not have to power down the converter to make it restart. the system will automatically restore operation as soon as the short circuit condi- tion is removed. remote on/off control on the input side, a remote on/off control can be speci? ed with either logic type. please refer to the connection diagram on page 1 for on/off connections. positive-logic models are enabled when the on/off pin is left open or is pulled high to +15v with respect to Cvin. positive-logic devices are disabled when the on/off is grounded or brought to within a low voltage (see speci? ca- tions) with respect to Cvin. negative-models with negative logic 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 left open or is pulled high to +15vdc max. with respect to Cvin. dynamic control of the on/off function should be able to sink the speci? ed signal current when brought low and withstand the speci? ed voltage when brought high. be aware too that there is a ? nite time in milliseconds (see spec- i? cations) between the time of on/off control activation and stable, output. this time will vary slightly with output load type and current and input conditions. output capacitive load these converters do not require external capacitance added to achieve rated speci? cations. users should only consider adding capacitance to reduce switching noise and/or to handle spike current load steps. install only enough capacitance to achieve noise objectives. excess external capacitance may cause degraded transient response and possible oscillation or instability. c1 c1 = 1f c2 = 10f load 2-3 inches (51-76mm) from module c2 r load scope +vout -vout figure 3. measuring output ripple and noise (pard)
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 13 of 15 www.murata-ps.com/support output ovp (output clamped) the rbe-12/20-d48 module incorporates circuitry to protect the output/load (output ovp, over voltage protection) by effectively clamping the output volt- age to a maximum of 13.5v under certain fault conditions. the initial output voltage is set at the factory for an accuracy of 1.5%, and is regulated over line load and temperature using a closed loop feedback system. in the event of a failure that causes the module to operate open loop (failure in the control loop), the output voltage will be determined by the input voltage/duty cycle of the voltage conversion (pulse width modulation) circuit. for example, when the input voltage is at 36v, the duty cycle is d1; when the input voltage is at 75v, the maximum duty cycle is d1/2; this change in duty cycle compensates vout for vin changes. as vin continues to increase above 75v the voltage at vout is clamped because maximum duty cycle has been reached. the output voltage is always proportional to vin*duty in a buck derived topology. figure 4 is the test waveform for the rbe-12/20-d48 module when its feedback loop is open, simulating a loop failure. channel 1 is the input voltage and channel 2 it the output voltage. when the input voltage climbs from 48vdc to 100vdc, the output voltage remains stable. figure 4. test waveform with feedback loop open
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 14 of 15 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 included. 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 [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. item reference description 1 c1, c7 smd -100v-1000nf- x7r-1210 2c2 smd -100v-100nf-10%- x7r-1206 3l1 -809uh-25%-9.7a-r5k- 28*26*12.7mm 4 c4, c5 0.1u/250v, 13*12*6-0.6-10mm 5c6 4700 f 6c3 220 f c1 l1 c2 c3 c4 c5 dc/dc c6 + + vcc rtn -48v gnd gnd c7 figure 5. conducted emissions test circuit graph 1. conducted emissions performance, positive line, cispr 22, class a, full load graph 2. conducted emissions performance, negative line, cispr 22, class a, full load
rbe-12/20-d48 series eighth-brick 240-watt isolated dc/dc converters mdc_rbe-12-20-d48.a02 page 15 of 15 www.murata-ps.com/support murata power solutions, inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. the descriptions contained her ein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to cha nge without notice. ? 2013 murata power solutions, inc. murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered this product is subject to the following operating requirements and the life and safety critical application sales policy : refer to: http://www.murata-ps.com/requirements/ figure 6. vertical wind tunnel through-hole soldering guidelines murata power solutions recommends the th soldering 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. your production environment may differ; therefore please thoroughly review thes e 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 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 10x 10 host carrier board for realistic heat absorption and spreading. both longitudinal and trans- verse air? ow studies are possible by rotation of this carrier board since there are often signi? cant differences in the heat dissipation in the two air? ow directions. the combination of adjustable air? ow, adjustable ambient heat, and adjustable input/output currents and voltages mean that a very wide range of measurement conditions can be studied. the collimator reduces the amount of turbulence adjacent to the uut by minimizing air? ow turbulence. such 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 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.

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