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mcd10112 rev. 1.1, 27-jan-10 page 1 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut applications ? wireless base stations ? telecommunications equipment ? lan/wan ? data processing ? industrial applications features ? rohs lead-free solder and lead-solder- exempted products are available ? ultra-wide input range: 18 ? 60 vdc ? 38% smaller footprint than standard 1/4 th -bricks ? cost-effective, single board construction ? low profile ? high efficiency ? input-to-output isolation: 1500 vdc ? basic insulation ? start-up into high capacitive load ? low conducted and radiated emi ? output overcurrent protection ? output overvoltage protection ? input undervoltage lockout ? overtemperature protection ? approved to ul 60950-1-03/ can/csa-c22.2 no. 60950-1, and tuv approved to en 60950-1, iec 60950-1 description the ems series of dc-dc converters provide a single is olated step-down voltage (3.3 or 5 vdc nominal) from a wide-input voltage range (18 ? 60 vdc). the ems is an exce llent choice in applications where multiple input voltage options are required. the designer can use a singl e ems converter to cover both 24vin and 48vin input ranges, eliminating the need to specify multiple modules to handle each input range. this is particularly useful in wireless base station applications where the power plants tend to vary and could provide nominal 24 or 48 v input. the ems converters are highly efficient over the entir e wide-input voltage range, cost-effective, and offer a low profile, industry-standard q uarter-brick footprint. the st andard feature set includes remote on/off, remote output voltage sensing, industry standard output trim, input unde rvoltage lockout, and overtemperature shutdown with hysteresis. model selection model input voltage vdc input current, max adc (1) output voltage vdc output rated current, i rated adc output ripple/noise, mv p-p (2) typical efficiency @ i rated & 36v in ems15de 18 - 60 3.2 3.3 15 50 90% ems10dg 18 - 60 3.2 5.0 10 50 90% this product is intended for integration into end-use equipment. all the required procedures for ce marking of end-use equipme nt should be followed. 1 @ v in minimum. 2 nominal, (dc to 500 khz) model numbers highlighted in yellow or s haded are not recommended for new designs.
mcd10112 rev. 1.1, 27-jan-10 page 2 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut absolute maximum ratings stresses in excess of the absolute maximum ratings ma y cause performance degradation, adversely effect long-term reliability, and cause permanent damage to the converter. parameter conditions/description min max units continuous 0 60 vdc input voltage transient withstand (100 ms) 100 vdc hot spot monitor location 2 (tc) -40 100 ? c operating temperature ambient -40 85 ? c storage temperature ambient -55 125 ? c on/off control voltage referenced to -vin -0.7 20 vdc ems15de 49.5 w output power 1 ems10dg 50 w 1 with appropriate power derating, see figures 27 - 32. 2 see temperature probe location t c , figure 26. [ref.v10 case] environmental and mechanical specifications all specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. parameter conditions/descrip tion min nom max units operating humidity relative humidity, non-condensing 95 % storage humidity relative humidity, non-condensing 95 % shock (half-sinewave, 6ms), 3 axes 50 g sinusoidal vibration gr-63-core, section 5.4.2 1 g weight 0.53/15 oz/g water washing standard process yes mtbf (calculated) per telcordia sr-332 issue 1, (method 1, case 2, gb, 40 o c) 1,750 khrs dimensions (overall) 2.3 (58.42) x 0.896 (22.76) x 0.42 (10.7) in (mm) markings & labeling includes p/n, logo, date code, country of manufacture isolation specifications all specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. parameter conditions/descrip tion min nom max units insulation safety rating basic isolation voltage input to output 1500 vdc isolation resistance input to output 10 m ? isolation capacitance input to output 2,700 pf
mcd10112 rev. 1.1, 27-jan-10 page 3 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut emi & safety regulatory compliance safety agency standard approved to: marking ul ul60950-1-03 / csa c22.2 no. 60950-1 curus tuv product service tuv en60950-1/a11:2004 tuv ps baurt mark cb report iec60950-1:2001 n/a declaration of conformity di r 73/23/eec low voltage directive ce conducted emissions 1 (with external emi filter) cispr 22 class a 1 see figures 33 & 34. input specifications all specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted. parameter conditions/descrip tion min nom max units input voltage continuous 18 60 vdc turn-on input voltage (uvlo) 1 ramping up 15 16.5 18 vdc turn-off input voltage 1 ramping down 13 15.5 17 vdc turn-off hysteresis 1 vdc input reflected ripple current @ i rated , 12h source inductance bw=20 mhz 2 10 72 ma p-p no-load input current 18 vdc < vin < 60 vdc 90 150 ma no-load power dissipation vin = 36 vdc 4 w disabled input current 18 vdc < vin < 60 vdc 25 50 ma input capacitance (internal) 1 f minimum input capacitance (external) (esr <0.7 ? ) 33 f inrush transient 0.1 a 2 s 1 see figure 2. 2 vin = 36vin; see figures 1 and 36.
mcd10112 rev. 1.1, 27-jan-10 page 4 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut output specifications all specifications apply over specif ied input voltage, output load, and @ 40 o c ambient temperature, unless otherwise noted. ems15de: 3.3v / 15a parameter conditions/descrip tion min nom max units output voltage (set-point) vin = 36 v, io =25 a 3.25 3.30 3.35 vdc 10 mv line regulation vi =18 v to 60 v, io =50% io.max 0.3 % 25 mv load regulation vin =36 v, io.min to io.max 0.75 % temperature coefficient -40 ? c < t amb < +85 ? c 0.02 %/ ? c 3.12 3.48 vdc total error band (line, load, temperature, ripple, life) +/- 5.5 % output power 1 w/ proper thermal derating 49.5 w output current 1 w/ proper thermal derating 0 15 a output current limit threshold vin = 36 v, vo < 90% vo nom 120 160 %iomax 50 100 mv p-p 1.5 3.0 % output ripple 2 over line and load, -40 ? c < t amb < +85 ? c (dc to 20 mhz) 17 35 mv rms dynamic regulation 3 peak deviation settling time peak deviation settling time 75-100-75% load step change, to 1% error band, co = 0 f slew = 1.0 a/ ? s >>> slew = 0.1 a/ ? s >>> +/-200 150 +/-100 150 +/-300 250 +/-200 250 mv ? s mv ? s efficiency 4 (t amb =40 ? c) vin nom , i o = i rated 90 % turn-on overshoot 5 overall input voltage, load, and temperature conditions 5 10 %vout turn-on time f (vin) 5 time from vin = uvlo to 90% of vout nom 3 10 ms turn-on time f (on/off) 6 time from enable to 90% of vout nom 25 50 ms rise time 5 from 10 to 90% of vout nom 1 2 ms admissible load capacitance 7 i rated , nom vin 330 4,950 ? f switching frequency 300 khz notes: 1 see figure 27 - 29. 2 see figure 15 for ripple waveform and figure 35 for measurement method. 3 see figures 9, 10 and 11. 4 see figure 3. 5 see figure 5. 6 see figure 7. 7 a minimum 330 f (avx, tpsd337k006r0045) is recommended for operati on over full load, line, and temperature range.
mcd10112 rev. 1.1, 27-jan-10 page 5 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut output specifications (cont?d) all specifications apply over specif ied input voltage, output load, and @ 40 o c ambient temperature, unless otherwise noted. ems10dg: 5v / 10a parameter conditions/descrip tion min nom max units output voltage (set-point) vi = 36 v, io =14 a 4.925 5.0 5.075 vdc 15 mv line regulation vi =18 v to 60 v, io =50% io.max 0.3 % 25 mv load regulation vi =36 v, io.min to io.max 0.5 % temperature coefficient -40 ? c < t amb < +85 ? c 0.02 %/ ? c 4.76 5.24 vdc total error band (line, load, temperature, ripple, life) +/- 4.8 % output power 1 w/ proper thermal derating 50 w output current 1 w/ proper thermal derating 0 10 a output current limit threshold vin = 36 v, vo < 90% vo nom 120 180 %iomax 50 120 mv p-p 1.0 2.4 % output ripple 2 over line and load, -40 ? c < t amb < +85 ? c (dc to 20 mhz) 17 42 mvrms dynamic regulation 1 peak deviation settling time peak deviation settling time 75-100-75% load step change, to 1% error band, co = 0 f slew = 1.0 a/ ? s >>> slew = 0.1 a/ ? s >>> +/-150 150 +/-100 150 +/-250 250 +/-200 250 mv ? s mv ? s efficiency 4 (t amb =40 ? c) vin nom , i o = i rated 90 % turn-on overshoot 5 overall input voltage, load, and temperature conditions 5 10 %vout turn-on time f (vin) 5 time from vin = uvlo to 90% of vout nom 3 10 ms turn-on time f (on/off) 6 time from enable to 90% of vout nom 25 50 ms rise time 5 from 10 to 90% of vout nom 3 6 ms admissible load capacitance 7 i rated , nom vin 220 3,300 ? f switching frequency 300 khz notes: 1 see figure 30 - 32. 2 see figure 16 for ripple waveform and figure 35 for measurement method. 3 see figures 12, 13 and 14. 4 see figure 4. 5 see figure 6. 6 see figure 8. 7 a minimum 220 f (avx, tpsd227k010r0050) is recommended for operati on over full load, line, and temperature range.
mcd10112 rev. 1.1, 27-jan-10 page 6 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut protections specifications all specifications apply over specifi ed input voltage, out put load, and @ 40 o c ambient temperature, unless otherwise noted. parameter conditions/descrip tion min nom max units overcurrent protection type non-latching ? auto-recovery, hiccup type. threshold ems15de 31.2 37.5 adc ems10dg vin = vin nom 16.8 22.4 adc short circuit 1 ems15de 17 30 a rms ems10dg hiccup mode 17 22 a rms overvoltage protection 2 type clamp, non-latching, hiccup mode. independent control loop, auto-reset. threshold 115 160 %vo overtemperature protection type non-latching, auto-recovery threshold temperature node: t c 3 100 ? c 1 refer to figures 17 & 18. 2 refer to figures 19 & 20. 3 refer to figure 26. feature specifications all specifications apply over specifi ed input voltage, out put load, and @ 40 o c ambient temperature, unless otherwise noted. parameter conditions/descrip tion min nom max units on/off 1 (on/off signal is low ? converter is on) converter on sink current -0.7 1.0 1.0 vdc madc negative logi c (-n suffix) on/off (pin 2) (primary side ref. to -vin) converter off open circuit voltage 3.5 7 20 18 vdc vdc (on/off signal is low ? converter is off) converter on open circuit voltage 3.5 7 20 18 vdc vdc positive logic (-p suffix) on/off (pin 2) (primary side ref. to -vin) converter off sink current -0.7 1.0 1.0 vdc madc remote sense remote sense headroom 10 %vo output voltage trim 2 trim up 10 %vo trim down -10 %vo 1 see figure 21. 2 the output voltage of the units can be increased to a maximum of 10%. this is comprised of a co mbination of the remote-sense a nd trim adjustment. do not exceed 10% of vonom betwe en +vout and ?vout terminals. also refer to ?output voltage adjust? section and figures 22 ? 25 for clarification.)
mcd10112 rev. 1.1, 27-jan-10 page 7 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut performance characteristic reflected ripple current figure 1. ems10dg, input reflected ripple current (typ.) conditions: output current = 10 adc (50 w). input voltage = 36 vdc. waveform: input rrc ~ 8 ma p-p (measured) scale: 2ma/10mv or 2ma/division. undervoltage lockout characteristics (typ) 0 1 2 3 4 5 0 10203040506070 input voltage (v) input current (a) turn on voltage threshold turn off voltage threshold figure 2. ems, uvlo input characteristics efficiency 30 40 50 60 70 80 90 100 1 0% 20% 30% 4 0% 50% 6 0% 70% 80% 9 0% 100% load (%) efficiency (%) 18 36 60 figure 3. efficiency, f (line & load) 30 40 50 60 70 80 90 100 10% 20% 3 0% 4 0% 50% 60% 7 0% 80% 90% 1 00% load (%) efficiency (%) 18 36 60 figure 4. efficiency, f (line & load) ems15de ems10dg
mcd10112 rev. 1.1, 27-jan-10 page 8 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut vo turn-on characteristics, f (v in ) figure 5. ems15de, turn-on @ power-up (typ) conditions: cext = 0 f ? scale : 5ms/div. channel 1 ? vout, t rise ~ 1.6 ms (typ.) scale : 1v/div. vout, t delay ~ 3.2 ms (typ.) channel 3 ? iout = 15 amps scale : 10a/div. channel 4 ?/- vin = 36 vdc (sna p-on) scale : 20v/div.. figure 6. ems10dg, turn-on @ power-up (typ) conditions: cext = 0 f ? scale : 5 ms/div. channel 1 ? vout, t rise ~ 2.8 ms (typ.) scale : 1 v/div. vout, t delay ~ 4 ms (typ.) channel 3 ? iout = 10 amps scale : 10 a/div. channel 4 ? vin = 36 vdc (snap-on) scale : 20 v/div.. vo turn-on characteristics, f (on/off) figure 7. ems15de, turn-on via on/off ctrl (typ) conditions: vin = 36 vdc ? cext=0 f ? output current: 15 adc channel 1 ? on/off signal scale : 5 v/div. channel 2 ? output voltage scale: 1 v/div. time base = 10 ms/div. delay time ~ 24 ms (typ.) figure 8. ems10dg, turn-on via on/off ctrl (typ) conditions: vin = 36 vdc ? cext = 0 f ? output current: 10 adc channel 1 ? on/off signal scale : 5 v/div. channel 2 ? output voltage scale: 1 v/div. time base = 10 ms/div. delay time ~ 34 ms (typ.)
mcd10112 rev. 1.1, 27-jan-10 page 9 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut dynamic load response (t a = +25 o c, typ.) figure 9. ems15de load response (typ) conditions: vin = 36v ? iout = 25% ? with slew rate: 1.0a/ ? s cext = 0f ? scale: 100 mv/div, 200 s/div. channel 1 ? voltage deviation: ~ 200 mv p (measured) channel 3 ? load switched from 11.25 a to 15 a figure 10. ems15de, load response (typ) conditions: vin = 36v ? iout = 25% ? with slew rate: 1.0a/ ? s cext = 3,000 f ? scale: 50 mv/div, 200 s/div. channel 1 ? voltage deviation: ~ 65 mv p (measured) channel 3 ? load switched from 11.25 a to 15 a figure 11. ems15de, load response (typ) conditions: vin = 36v ? iout = 25% ? with slew rate: 0.1a/ ? s cext = 0 f ? scale: 50 mv/div, 200 s/div. channel 1 ? voltage deviation: ~ 80 mv p (measured) channel 3 ? load switched from 11.25 a to 15 a figure 12. ems10dg, load response (typ) conditions: vin = 36v ? iout = 25% ? with slew rate: 1.0a/ ? s cext = 0f ? scale: 100 mv/div, 200 s/div. channel 1 ?- voltage deviation: ~ 150 mv p (measured) channel 3 ? load switched from 7.5 a to 10 a figure 13. ems10dg, load response (typ) conditions: vin = 36v ? iout = 25% ? with slew rate: 1.0a/ ? s cext = 3,000 f ? scale: 50 mv/div, 200 s/div. channel 1 ? voltage deviation: ~ 40 mv p (measured) channel 3 ? load switched from 7.5 a to 10 a figure 14. ems10dg, load response (typ) conditions: vin = 36v ? iout = 25% ? with slew rate: 0.1a/ ? s cext = 0 f ? scale: 50 mv/div, 200 s/div. channel 1 ? voltage deviation: ~ 110 mv p (measured) channel 3 ? load switched from 7.5 a to 10 a
mcd10112 rev. 1.1, 27-jan-10 page 10 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut output ripple and noise (typical for -40 ? c < t amb < +85 ? c, +25 ? c shown) figure 15. ems15de output ripple & noise (typ.) conditions: vin = 60 v ? iout = 15.0 a ? t a = +25 o c channel 1 - vo, ~46 mv p-p / ~16 mv rms (measured) figure 16. ems10dg output ripple & noise (typ.) conditions: vin = 60 v ? iout = 10.0 a ? t a = +25 o c channel 1 - vo, ~35 mv p-p / ~12 mv rms (measured) pre-bias conditions the ems converters will start-up into a pre-bias voltage of 50% vo nom without damage. overcurrent protection when the output is loaded above the maximum output current rating, the voltage of the converter will reduce to maintain the output power at a safe level. in the case of a high overload or short circ uit condition where the output voltage is pulled below 50% of vo-nom, the unit will enter into a ?hiccup? mode of operati on. under this condition, the converter will attempt to restart, typically every 250ms, until the overload has cleared. because of very low duty cycle, the rms value of output current is kept low. once the output current is reduced to within its rated range, the converter automatically exits the hiccup mode and continues normal operation. figure 17, ems15de, short circuit behavior (typ.) vin=60 vdc ? i sc < 8.75 a rms ? scale: 5a/div. figure 18, ems10dg, short circuit behavior (typ.) vin=60 vdc ? i sc < 7.5 a rms ? scale: 5a/div.
mcd10112 rev. 1.1, 27-jan-10 page 11 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut overvoltage protection the output overvoltage protec tion consists of a separate control loop, independent of the primary control loop. this secondary control loop has a higher voltage set point than the primary loop. in a fault c ondition, the converter enters a ?hiccup? mode of operation, and ensures that the output voltage does not exceed v ovp max. figure 19. ems15de, induced ovp behavior (typ.) conditions: vin = 36 v ? iout = 75% load. channel 1- vo, scale: 1v/div., 1s/div. figure 20. ems15dg, induced ovp behavior (typ.) conditions: vin = 36 v ? iout = 75% load. channel 1- vo, scale: 1v/div., 1s/div. typical application input and output impedance the ems-series has been designed for stability without external capacitance when used in low inductance input and output circuits. in many applications, the inductance associated with the distribution of the power source to the input of the power converter can negatively affect a converter?s stability. the additi on of a 33 f electrolytic capacitor with an esr < 100 m ? , across the input helps to ensure stability of the converte r. this capacitor should be of suitably high quality and ra ted for effective use at low temperatures as needed. refer to the ?inrush current control application note? on www.power-one.com for suggestions on how to limit the magnitude of the inrush current. additionally, see the emc section further below in this datasheet for discussion for other external component which may be required for reduction of conducted emissions. the ems can support high amounts of output capacitance. refer to ? output specification? tables for details. inrush current refer to the ?inrush current control application note?: (http://www.power-one.com/technical/articles/dc-dc_1-app.pdf ) for suggestions on how to limit the magnitude of the inrush current. features description on/off control (-x) ?no suffix? model with the positive logic model, when the on/off pin is pulled low, the output is turned off and the unit draws less than 25 ma of input current. if the on/off pin is not used, it can be left floating. (-n) suffix model with negative logic , when the on/off pin is pulled low, the unit is turned on. if the on /off pin is not used, it can be connected to the -vin pin. figure 21. ems on/off control (common to ?x & ?n models) the on/off pin in the ems converter functions as a normal soft shutdown. the on/off pin is pulled up internally, so no external voltage source is required or recommended. the user should avoid connecting a resistor between the on/off pin and the +vin pin. the on/off pin is internally referenced to the ?vin pin. an open collector switch is recommended to control the voltage between these two points. the controlling signal must not be referenced ahead of emi filtering, or remotely from the unit. optical coupling the control signal and locating the opto-coupler directly bat the converter, is recommended for trouble free operation.
mcd10112 rev. 1.1, 27-jan-10 page 12 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut output voltage adjustment (trim) the industry standard trim feat ure allows the user to adjust the output voltage from its nominal value. this can be used to accommodate production margin testing. output voltage adjustment is accomplished by connecting an external resistor between the trim pin and to either the +v out or ?v out pins. that below defines the two versions as well as trim equations used to determine a trim resistor value for a certain trim voltage. figure 22. ems trim schematic with an external resistor ( r up ) connected between the trim pin and +v out pin, the output voltage set-point (vo) increases. the following equation determines the required external resistor value to obtain an adjusted output voltage: where % is the percentage change from vo nom . figure 23. ems trim schematic with an external resistor ( r down ) between the trim pin and ?v out pin the output voltage set-point (vo) decreases. the following equation determines the required external resistor value to obtain an adjusted output voltage: ems15de trim values: vo increase vo decrease vo% r -up (k ? ) new vo (v dc ) vo% r -down (k ? ) new vo (v dc ) 1 869 3.33 1 501 3.27 2 436 3.37 2 245 3.23 3 292 3.40 3 160 3.20 4 220 3.43 4 118 3.17 5 177 3.47 5 92 3.14 6 148 3.50 6 75 3.10 7 127 3.53 7 63 3.07 8 112 3.56 8 54 3.04 9 100 3.60 9 47 3.00 10 90 3.63 10 41 2.97 2.7 2.9 3.1 3.3 3.5 3.7 3.9 0 200 400 600 800 1000 resistance (kohm) voltage (v) vo up vo down figure 24. ems15de trim characteristics ems10dg trim values vo increase vo decrease vo% r -up (k ? ) new vo (v dc ) vo% r -down (k ? ) new vo (v dc ) 1 1585 5.05 1 501 4.95 2 798 5.1 2 245 4.90 3 536 5.15 3 160 4.85 4 404 5.2 4 118 4.80 5 326 5.25 5 92 4.75 6 273 5.3 6 75 4.70 7 236 5.35 7 63 4.65 8 207 5.4 8 54 4.60 9 186 5.45 9 47 4.55 10 168 5.5 10 41 4.50 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 5.8 0 500 1000 1500 2000 resistance (kohm) voltage (v) vo up vo down figure 25. ems10dg trim characteristics ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 22 . 10 % 511 % 225 . 1 %) 100 ( 11 . 5 v v v vout r up ?? ? ? ? ? ? ? ? ? ? ? 22 . 10 % 511 vo r down
mcd10112 rev. 1.1, 27-jan-10 page 13 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut notes: 1. when the output voltage is trimmed up, the output power from the converter must not exceed its maximum rating. the power is determined by measuring the output voltage on the output pins, and multiplying it by the output current. 2. in order to avoid creating apparent load regulation degradation, it is important that the trim resistors be connected directly to the remo te sense pins, and not to the load or to traces going to the load. 3. the output voltage increase can be accomplished either by the trim or by the remote sense or by the combination of both. in any case, the absolute maximum output voltage increase shall not exceed the limits defined in the features specification section above. 4. either rup or rdown should be used to adjust the output voltage according to the equations above. if both rup and rdown are used simultaneously, they will form a resistive divider and the equations above will not apply. thermal considerations ems converters are designed for both natural and forced convection cooling. to achieve long term reliability, the recommended power derating curves below, were established by comparing measured junction and hot spot temperatures against those allowed per power-one?s component derating guidelines the graphs in figures 27 through 29 and 30 through 32 show the maximum recommended output current of each ems converter at various ambient temperatures under both natural and forced-convection cooling (longitudinal airflow direction, from pin 1 to pin 3). ratings at input voltages of 24, 36, and 48 vdc are provided. thermal measurements measurements requiring airflow were made in power- one?s vertical wind tunnel equipment using both infrared (ir) thermography as well as the traditional thermocouple method. the converter was soldered to a test board consisting of a 0.060? thick printed wiring board (pwb) with four layers. the top and bottom layers were not metalized. the two inner layers, comprised of two-ounce copper, were used to provide traces for connectivity to the converter. the lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the pwb was minimized. this provides a worst-case but consistent scenario for thermal derating purposes. with the converter installed into the host application, customer verification that all components are at or below their safe operating temperatures may be performed similarly. however, for a more simplified testing method, monitoring the converter?s designated thermal reference point (t c ) will yield effective results. the recommended location of the measuring thermocouple is shown below. this reference point should be maintained at < 100 o c. it is recommended to use a 32awg to 40awg thermocouple wire probe on the location identified below; labeled t c figure 26. ems thermal reference point, t c . power derating f (v in, t a , airflow) direction of airflow: from ?v in (pin 1) to +v in (pin 3) 0 4 8 12 16 25 40 55 70 85 ambient temperature (deg c) load current (a) nc (25 - 35 lfm) 100 lfm 200 lfm 300 lfm 400 lfm figure 27. ems15de, vin = 24 vdc 0 4 8 12 16 25 40 55 70 85 ambient temperature (deg c) load current (a) nc (25 - 35 lfm) 100 lfm 200 lfm 300 lfm 400 lfm figure 28. ems15de, vin = 36 vdc
mcd10112 rev. 1.1, 27-jan-10 page 14 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut 0 4 8 12 16 25 40 55 70 85 ambient temperature (deg c) load current (a) nc (25 - 35 lfm) 100 lfm 200 lfm 300 lfm 400 lfm figure 29. ems15de, vin = 48 vdc 0 4 8 12 25 40 55 70 85 ambient temperature (deg c) load current (a) nc (25 - 35 lfm) 100 lfm 200 lfm 300 lfm 400 lfm figure 30. ems10dg, vin = 24 vdc 0 4 8 12 25 40 55 70 85 ambient temperature (deg c) load current (a) nc (25 - 35 lfm) 100 lfm 200 lfm 300 lfm 400 lfm figure 31. ems10dg, vin = 36 vdc 0 4 8 12 25 40 55 70 85 ambient temperature (deg c) load current (a) nc (25 - 35 lfm) 100 lfm 200 lfm 300 lfm 400 lfm figure 32. ems10dg, vin = 48 vdc safety considerations the ems converters feature 1500 vdc isolation from input to output. the input-to-output resistance is greater than 10 m ? . these converters are provided with basic insulation between input and output circuits according to all iec60950 based standards. ne vertheless, if the system using the converter needs to receive safety agency approval, certain rules must be followed in the design of the system. in particular, all of the creepage and clearance requirements of the end-use safety requirements must be obs erved. these documents include ul60950 - csa60950-00 and en60950, although other or additional requirements may be needed for specific applications. the ems converter has no internal fuse. the external fuse must be provided to protect the system from catastrophic failure. refer to the ?input fuse selection for dc/dc converters? application note on www.power- one.com for proper selection of the input fuse. both input traces and the chassis ground trace (if applicable) must be capable of conducting a current of 1.5 times the value of the fuse without opening. the fuse must not be placed in the grounded input line, if any. in order for the output of the ems converter to be considered as selv (safety extra low voltage) or tnv-1, according to all iec60950 based standards, one of the following requirements must be met in the system design: ? if the voltage source feeding the module is selv or tnv-2, the output of the converter may be grounded or ungrounded. ? if the voltage source feedin g the module is elv, the output of the converter may be considered selv only if the output is grounded per the requirements of the standard. ? if the voltage source feeding the module is a hazardous voltage secondary circuit, the voltage source feeding the module must be provided with at least basic insulation between the source to the converter and any hazardous voltages. the entire system, including the ems converter, must pass a dielectric withstand test for reinforced insulation. design of this type of system requires expert engineering and understanding of the overall safety requirements and should be performed by qualified personnel. note: this information is provi ded for guidance only and the user is responsible for any design c onsiderations regarding safety.
mcd10112 rev. 1.1, 27-jan-10 page 15 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut pups c4 vin+ vin- c4 c2 c1 f1 +vout -vout +vin -vin case conducted emi the following conducted emi f ilter configuration and component values are offered as a guideline to assist in designing an effective filter solution in the actual application. many factors can affect overall emi performance; such as layout, wire routing and load characteristics, among others. as a result, the final circuit configuration and component values may require adjustment. figure 33. emi filter configuration ref. des description manufacturer c1 ? c4 not used n/a f1 f4810 input filter module power-one figure 34. conducted emi scan of the ems10dg (w/ input filter components designated in table above.) test conditions: vin = 36 vdc, io = 100% rated (50w) test specification: (cispr-22) ne55022 class a (peak detect) other measurement methods to improve the accuracy and repeatability of ripple and noise measurements, power-one utilizes the test setups shown in figure 35 & 36 below. dut 0.1uf ceramic scope +vo1 -vo1 10uf @ 35v esr=0.3 tantalum load1 +vin +vin copper plane (3 to 4 inches) figure 35. output ripple and noise set-up. a bnc connector is used for measurements to eliminate noise pickup associated with long ground leads of conventional scope probes. the load is located 3? - 4? away from the converter. for output decoupling, we recommend using a 10 f low esr tantalum (avx tpsc106m025r0500 is used in power-one test setup) and a 0.1 f ceramic capacitor. note that the capacitors do not substitute for filtering required by the load. figure 36. input reflected ripple current setup. note: measure input reflected-ripple current with a simulated inductance (ltest) of 12 h. capacitor c s offsets possible battery impedance. measure current as shown above. battery cs 220 uf esr < 0.1 ohm @ 20 oc, 100 khz ltest 12 uh 33 uf esr < 0.7 ohm @ 20 oc, 100 khz vi(+) vi(-) to oscilloscope
mcd10112 rev. 1.1, 27-jan-10 page 16 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut mechanical drawing mechanical tolerances & finishes: general dimensions millimeters inches x.x = 0.5 x.xx = 0.020 tolerances x.xx 0.25 x.xxx = 0.010 distance from tallest converter component to host board 0.25 min 0.010 min pins diameter 0.05 0.002 length 0.5 +/-.020 shoulder diameter pins: 1-3 & 5-7 1.80 0.076 pins: 4 & 8 n/a n/a material & finish brass w/ matte sn over ni pin assignments function 1 -vin 2 on/off 3 +vin 4 -vout 5 -sense 6 trim 7 +sense 8 +vout
mcd10112 rev. 1.1, 27-jan-10 page 17 of 17 www.power-one.com ems series, dc-dc converter data sheet wide-ran g e in p ut ; 3.3 & 5.0 vdc @ 50w out p ut ordering information options (suffixes) series name # of outputs i out (adc) v in range (vdc) v out (vdc) - on/off logic pin length rohs em s ## d w - x y g 15 e = 3.3vo e = 1/8 th brick s ingle output 10 18 to 60 g = 5.0vo - none = pos. n = neg. none = 4.77mm [0.188"] 7 = 3.68mm [0.145"] 8 = 2.79mm [0.110"] no suffix ? rohs lead-solder- exemption compliant g ? rohs compliant for all six substances example: ems at 5.0 vo with negative logic, and 3.68 mm [0.145?] length pins, and rohs compliant for all six substances = ems10 dg-n7g notes 1. consult factory for the comp lete list of available options. nuclear and medical applications - power-one products are not de signed, intended for use in, or authorized for use as critical components in life support systems, equipment used in hazardous env ironments, or nuclear control systems without the express wr itten consent of the respecti ve divisional president of power-one, inc. technical revisions - the appearance of products, including safety agency certifications pictured on labels, may change dependi ng on the date manufactured. specifications are subject to change without notice.

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