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datasheet ds_e48sc3r320_05182011 features ? high efficiency: 91% @ 3.3v/20a ? size: 58.4mmx22.8mmx9.0mm (2.30?x0.90?x0.35?) ? standard footprint ? industry standard pin out ? fixed frequency operation ? input uvlo, output ocp, ovp, otp ? 2250v isolation ? basic insulation ? no minimum load required ? iso 9001, tl 9000, iso 14001, qs 9000, ohsas 18001 certified manufacturing facility ? ul/cul 60950-1 (us & canada) recognized, and tuv (en60950-1) certified applications ? telecom / datacom ? wireless networks ? optical network equipment ? server and data storage ? industrial / testing equipment options ? positive on/off logic ? smt or through-hole version delphi series e48sc, eighth brick family dc/dc power modules: 48v in, 3.3v/20a out the delphi series e48sc, eighth brick, 48v input, single output, isolated dc/dc converter is the latest offering from a world leader in power systems technology and manufacturing -- delta electronics, inc. this product family provides up to 85 watts, improved and very cost effective power solution of either 3.3v or 5v in an industry standard footprint and pinout. with creative design technology and optimization of component placement, these converters possess outstanding electrical and thermal performances, as well as extremely high reliability under highly stressful operating conditions. all models are fully protected from abnormal input/output voltage, current, and temperature conditions. the delphi series converters meet all safety requirements with basic insulation.
ds_e48sc3r320_05182011 2 technical specifications (t a =25c, airflow rate=300 lfm, v in =48vdc, nominal vout unless otherwise noted.) parameter notes and conditions e48sc3r320 (standard) min. typ. max. units absolute maximum ratings input voltage continuous 75 vdc transient 100ms 100 vdc operating temperature refer to figure 21 for measuring point -40 110 c storage temperature -55 125 c input/output isolation voltage 2250 vdc input characteristics operating input voltage 36 75 vdc input under-voltage lockout turn-on voltage threshold 33 34 35 vdc turn-off voltage threshold 31 32 33 vdc lockout hysteresis voltage 1 2 3 vdc maximum input current 100% load, 36vin 2.3 a no-load input current 60 ma off converter input current 4 ma inrush current(i 2 t) 1 a 2 s input reflected-ripple current p-p thru 12h inductor, 5hz to 20mhz 20 ma input voltage ripple rejection 120 hz 60 db output characteristics output voltage set point vin=48v, io=io.max, tc=25c 3.267 3.300 3.333 vdc output voltage regulation over load io=io,min to io,max 3 10 mv over line vin= 36v to 75v 3 10 mv over temperature tc= -40c to 85c 15 mv total output voltage range over sample load, line and temperature 3.234 3.366 v output voltage ripple and noise 5hz to 20mhz bandwidth peak-to-peak full load, 1f ceramic, 10f tantalum 30 75 mv rms full load, 1f ceramic, 10f tantalum 15 30 mv operating output current range 0 20 a output dc current-limit inception output voltage 10% low 110 140 % dynamic characteristics output voltage current transient 48v, 10f tan & 1f ceramic load cap, 0.1a/s positive step change in output current 50% io.max to 75% io.max 80 mv negative step change in output current 75% io.max to 50% io.max 80 mv settling time (within 1% vout nominal) 200 s turn-on transient start-up time, from on/off control 20 ms start-up time, from input 20 ms maximum output capacitance full load; maximum 5% overshoot of vout at startu p 20000 f efficiency 100% load 91 % 60% load 91.5 % isolation characteristics input to output 2250 vdc isolation resistance 10 m ? isolation capacitance 1000 pf feature characteristics switching frequency 325 khz on/off control, negative remote on/off logic logic low (module on) von/off at ion/off=1.0ma 0 0.7 v logic high (module off) von/off at ion/off=0.0 a 2.4 18 v on/off control, positive remote on/off logic logic low (module off) von/off at ion/off=1.0ma 0 0.7 v logic high (module on) von/off at ion/off=0.0 a 2.4 18 v on/off current (for both remote on/off logic) ion/off at von/off=0.0v 1 ma leakage current (for both remote on/off logic) logic high, von/off=15v 50 a output voltage trim range pout ?? max rated power -20% 10% % output voltage remote sense range pout ?? max rated power 10 % output over-voltage protection over full temperature range 4.5 v general specifications mtbf io=80% of io, max; 300lfm @25c 4.87 m hours weight 19.6 grams over-temperature shutdown refer to figure 21 for measuring point 115 c
ds_e48sc3r320_05182011 3 electrical characteristics curves figure 1: efficiency vs. load current for minimum, nominal, and maximum input voltage at 25c figure 2: power dissipation vs. load current for minimum, nominal, and maximum input voltage at 25c. 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 30 35 40 45 50 55 60 65 70 75 input v ol ta ge ( v ) input current (a) 1 figure 3: typical full load input characteristics at room temperature
ds_e48sc3r320_05182011 4 electrical characteristics curves for negative remote on/off logic figure 4: turn-on transient at full rated load current (cc mode load ) (10 ms/div). vin=48v.top trace: vout, 2v/div; bottom trace: on/off input, 5v/div figure 5: turn-on transient at zero load current (10 ms/div). vin=48v.top trace: vout, 2v/div; bottom trace: on/off input, 5v/div for positive remote on/off logic figure 6: turn-on transient at full rated load current (cc mode load) (10 ms/div). vin=48v.top trace: vout, 2v/div; bottom trace: on/off input, 5v/div figure 7: turn-on transient at zero load current (10 ms/div). vin=48v.top trace: vout, 2v/div, bottom trace: on/off input, 5v/div
ds_e48sc3r320_05182011 5 electrical characteristics curves figure 8: output voltage response to step-change in load current (75%-50%-75% of io, max; di/dt = 0.1a/s). load cap: 10f, tantalum capacitor and 1f ceramic capacitor. top trace: vout (100mv/div, 200us/div), bottom trace: i out (5 a /div). scope measurement should be made using a bnc cable (length shorter than 20 inches). position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module figure 9: output voltage response to step-change in load current (75%-50%-75% of io, max; di/dt = 2.5a/s). load cap: 330f, 35m ? esr solid electrolytic capacitor and 1f ceramic capacitor. top trace: vout (100mv/div, 200us/div), bottom trace: i out (5a/div). scope measurement should be made using a bnc cable (length shorter than 20 inches). position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module figure 10: test set-up diagram showing measurement points for input terminal ripple current and input reflected ripple current. note: measured input reflected-ripple current with a simulated source inductance (l test ) of 12 h. capacitor cs offset possible battery impedance. measure current as shown above
ds_e48sc3r320_05182011 6 electrical characteristics curves figure 11: input terminal ripple current, i c , at full rated output current and nominal input voltage with 12h source impedance and 33f electrolytic capacitor (500 ma/div, 2us/div) figure 12: input reflected ripple current, i s , through a 12h source inductor at nominal input voltage and rated load current (50 ma/div, 2us/div) strip copper vo(-) vo(+) 10u 1u scope resistiv e load figure 13: output voltage noise and ripple measurement test setup
ds_e48sc3r320_05182011 7 electrical characteristics curves 0 1 2 3 4 0369121518212427 loa d current( a ) o utput vo ltag e(v) 1 figure 14: output voltage ripple at nominal input voltage and rated load current (i o=20a )(20 mv/div, 2us/div) load capacitance: 1f ceramic capacitor and 10f tantalum capacitor. bandwidth: 20 mhz. scope measurements should be made using a bnc cable (length shorter than 20 inches). position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module figure 15: output voltage vs. load current showing typical current limit curves and converter shutdown points
ds_e48sc3r320_05182011 8 ? the input source must be insulated from the ac mains by reinforced or double insulation. ? the input terminals of the module are not operator accessible. ? a selv reliability test is conducted on the system where the module is used , in combination with the module, to ensure that under a single fault, hazardous voltage does not appear at the module?s output. when installed into a class ii equipment (without grounding), spacing consideration should be given to the end-use installation, as the spacing between the module and mounting surface have not been evaluated. the power module has extra-low voltage (elv) outputs when all inputs are elv. this power module is not internally fused. to achieve optimum safety and system protection, an input line fuse is highly recommended. the safety agencies require a fuse with 10a maximum rating to be installed in the ungrounded lead. a lower rated fuse can be used based on the maximum inrush transient energy and maximum input current. soldering and cleaning considerations post solder cleaning is usually the final board assembly process before the board or system undergoes electrical testing. inadequate cleaning and/or drying may lower the reliability of a power module and severely affect the finished circuit board assembly test. adequate cleaning and/or drying is especially important for un-encapsulated and/or open frame type power modules. for assistance on appropriate soldering and cleaning procedures, please contact delta?s technical support team. design considerations input source impedance the impedance of the input source connecting to the dc/dc power modules will interact with the modules and affect the stability. a low ac-impedance input source is recommended. if the source inductance is more than a few h, we advise adding a 10 to 100 f electrolytic capacitor (esr < 0.7 ? at 100 khz) mounted close to the input of the module to improve the stability. layout and emc considerations delta?s dc/dc power modules are designed to operate in a wide variety of systems and applications. for design assistance with emc compliance and related pwb layout issues, please contact delta?s technical support team. an external input filter module is available for easier emc compliance design. application notes to assist designers in addressing these issues are pending release. safety considerations the power module must be installed in compliance with the spacing and separation requirements of the end-user?s safety agency standard, i.e., ul60950-1, csa c22.2 no. 60950-1 2nd and iec 60950-1 2nd : 2005 and en 60950-1 2nd: 2006+a11+a1: 2010, if the system in which the power module is to be used must meet safety agency requirements. basic insulation based on 75 vdc input is provided between the input and output of the module for the purpose of applying insulation requirements when the input to this dc-to-dc converter is identified as tnv-2 or selv. an additional evaluation is needed if the source is other than tnv-2 or selv. when the input source is selv circuit, the power module meets selv (safety extra-low voltage) requirements. if the input source is a hazardous voltage which is greater than 60 vdc and less than or equal to 75 vdc, for the module?s output to meet selv requirements, all of the following must be met:
ds_e48sc3r320_05182011 9 features descriptions over-current protection the modules include an internal output over-current protection circuit, which will endure current limiting for an unlimited duration during output overload. if the output current exceeds the ocp set point, the modules will automatically shut down (hiccup mode). the modules will try to restart after shutdown. if the overload condition still exists, the module will shut down again. this restart trial will continue until the overload condition is corrected. over-voltage protection the modules include an internal output over-voltage protection circuit, which monitors the voltage on the output terminals. if this voltage exceeds the over-voltage set point, the module will shut down (hiccup mode) ? the modules will try to restart after shutdown. if the over voltage condition still exists, the module will shut down again. this restart trial will continue until the over voltage condition is corrected. over-temperature protection the over-temperature protection consists of circuitry that provides protection from thermal damage. if the temperature exceeds the over-temperature threshold the module will shut down. the module will restart if the temperature is within specification. remote on/off the remote on/off feature on the module can be either negative or positive logic. negative logic turns the module on during a logic low and off during a logic high. positive logic turns the modules on during a logic high and off during a logic low. remote on/off can be controlled by an external switch between the on/off terminal and the vi(-) terminal. the switch can be an open collector or open drain. for negative logic if the remote on/off feature is not used, please short the on/off pin to vi(-). for positive logic if the remote on/off feature is not used, please leave the on/off pin to floating. vo(+) vi(+) vo(-) sense(-) sense(+) vi(-) on/off figure 16: remote on/off implementation remote sense remote sense compensates for voltage drops on the output by sensing the actual output voltage at the point of load. the voltage between the remote sense pins and the output terminals must not exceed the output voltage sense range given here: [vo(+) ? vo(?)] ? [sense(+) ? sense(?)] 10% ?? vout this limit includes any increase in voltage due to remote sense compensation and output voltage set point adjustment (trim). vi(-) vi(+) vo(-) vo(+) sense(+) sense(-) resistance contact contact and distribution losses figure 17: effective circuit configuration for remote sense operation if the remote sense feature is not used to regulate the output at the point of load, please connect sense(+) to vo(+) and sense(?) to vo(?) at the module. the output voltage can be increased by both the remote sense and the trim; however, the maximum increase is the larger of either the remote sense or the trim, not the sum of both. when using remote sense and trim, the output voltage of the module is usually increased, which increases the power output of the module with the same output current. care should be taken to ensure that the maximum output power does not exceed the maximum rated power.
ds_e48sc3r320_05182011 10 features descriptions (con.) output voltage adjustment (trim) to increase or decrease the output voltage set point, the modules may be connected with an external resistor between the trim pin and either the sense(+) or sense(-). the trim pin should be left open if this feature is not used. figure 18: circuit configuration for trim-down (decrease output voltage) if the external resistor is connected between the trim and sense (-) pins, the output voltage set point decreases (fig. 18). the external resistor value required to obtain a percentage of output voltage change ? % is defined as: () ? ? ? = ? k down rtrim 2 . 10 511 ex. when trim-down -20%(3.3v0.8=2.64v) () ? = ? = ? k down rtrim 4 . 15 2 . 10 20 511 figure 19: circuit configuration for trim-up (increase output voltage) if the external resistor is connected between the trim and sense (+) the output voltage set point increases (fig. 19). the external resistor value required to obtain a percentage output voltage change ? % is defined as: () ? ? ? ? ? ? + = ? k up rtrim 2 . 10 511 1.225 ) (100 vo 11 . 5 ex. when trim-up +10%(3.3v1.1=3.63v) () ? = ? ? + = ? k up rtrim 1 . 90 2 . 10 10 511 10 1.225 ) 10 (100 3 . 3 11 . 5 the output voltage can be increased by both the remote sense and the trim, however the maximum increase is the larger of either the remote sense or the trim, not the sum of both. when using remote sense and trim, the output voltage of the module is usually increased, which increases the power output of the module with the same output current. care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power.
ds_e48sc3r320_05182011 11 thermal considerations thermal management is an important part of the system design. to ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the module. convection cooling is usually the dominant mode of heat transfer. hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel. thermal testing setup delta?s dc/dc power modules are characterized in heated vertical wind tunnels that simulate the thermal environments encountered in most electronics equipment. this type of equipment commonly uses vertically mounted circuit cards in cabinet racks in which the power modules are mounted. the following figure shows the wind tunnel characterization setup. the power module is mounted on a test pwb and is vertically positioned within the wind tunnel. the space between the neighboring pwb and the top of the power module is constantly kept at 6.35mm (0.25??). note: wind tunnel test setup figure dimensions are in millimeters and (inches) 12.7 (0.5?) module a ir flow 50.8 ( 2.0? ) facing pwb pwb a ir velocit y a nd ambient temperature measured below the module figure 20: wind tunnel test setup thermal derating heat can be removed by increasing airflow over the module. to enhance system reliability; the power module should always be operated below the maximum operating temperature. if the temperature exceeds the maximum module temperature, reliability of the unit may be affected. thermal curves figure 21: hot spot temperature measured point. ? the allowed maximum hot spot temperature is defined at 110 j e48sc3r320 (standard) output current vs. ambient temperature and air velocity @vin=48v (transverse orientation) 0 4 8 12 16 20 25 30 35 40 45 50 55 60 65 70 75 80 85 output current (a) ambient temperature ( ?? ) natural convection 100lfm 200lfm 300lfm 400lfm 500lfm 600lfm figure 22: output current vs. ambient temperature and air velocity @ v in =48v(transverse orientation)
ds_e48sc3r320_05182011 12 pick and place location surface-mount tape & reel recommended pad layout (smd)
ds_e48sc3r320_05182011 13 leaded (sn/pb) process recommend temperature profile time ( sec. ) pre-heat temp. 140~180 x c 60~120 sec. peak temp. 210~230 x c 5sec. ramp-up temp. 0.5~3.0 x c /sec. temperature ( x c ) 50 100 150 200 250 300 60 0 120 180 240 2nd ramp-up temp. 1.0~3.0 x c /sec. over 200 x c 40~50sec. cooling down rate <3 x c /sec. note: the temperature refers to the pin of e48sc, measured on the pin +vout joint. lead free (sac) process recommend temperature profile temp . time 150 j 200 j 100~140 sec. time limited 90 sec. above 217 j 217 j preheat time ramp up max. 3 j /sec. ramp down max. 4 j /sec. peak tem p . 240 ~ 245 j 25 j note: the temperature refers to the pin of e48sc , measured on the pin +vout joint.
ds_e48sc3r320_05182011 14 mechanical drawing surface-mount module through-hole module pin no. name function 1 2 3 4 5 6 7 8 +vin on/off -vin -vout -sense trim +sense +vout positive input voltage remote on/off negative input voltage negative output voltage negative remote sense output voltage trim positive remote sense positive output voltage
ds_e48sc3r320_05182011 15 part numbering system e 48 s c 3r3 20 n r f a type of product input voltage number of outputs product series output voltage output current on/off logic pin length/type option code e- eighth brick 48 - 36~75v s- single c- improved e48sr series 3r3 - 3.3v 20 -20a n - negative p - positive r - 0.170 n - 0.145? m - smd pin f- rohs 6/6 (lead free) space - rohs 5/6 a- standard functions model list model name input output eff @ 100% load e48sc3r315nr a 36v~75v 1.8a 3.3v 15a 91.0% e48sc3r315nn a 36v~75v 1.8a 3.3v 15a 91.0% e48sc3r315nmfa 36v~75v 1.8a 3.3v 15a 91.0% e48sc3r320nrfa 36v~75v 2.3a 3.3v 20a 91.0% e48sc3r325nrfa 36v~75v 3.0a 3.3v 25a 91.0% e48sc3r325nn a 36v~75v 3.0a 3.3v 25a 91.0% e48sc05012nrfa 36v~75v 2.1a 5.0v 12a 91.5% e48sc05012nn a 36v~75v 2.1a 5.0v 12a 91.5% default remote on/off logic is negative and pin length is 0.170? for different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales office . contact: www.delta.com.tw/dcdc usa: telephone: east coast: (888) 335 8201 west coast: (888) 335 8208 fax: (978) 656 3964 email: dcdc@delta-corp.com europe: telephone: +41 31 998 53 11 fax: +41 31 998 53 53 email: dcdc@delta-es.tw asia & the rest of world: telephone: +886 3 4526107 ext.6220~6224 fax: +886 3 4513485 email: dcdc@delta.com.tw warranty delta offers a two (2) year limited warranty. complete warranty information is listed on our web site or is available upon request from delta. information furnished by delta is believed to be accurate and reliable. however, no responsibility is assumed by delta for its use, nor for any infringements of patents or other rights of third parties, which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of delta. delta reserves the right to revise these specifications at any time, without notice .

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