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features ? high efficiency: 90 .5 % @ 3.3v/ 10a ? size: 47.2mm x 29.5mm x 8.35mm ( 1.86" x 1.16" x 0.33" ) ? low profile: 0.3 3 " ? industry standard footprint and pin out ? surface mountable ? fixed frequency operation ? input uvlo, output ocp, ovp ? no minimum load required ? 2:1 input voltage range ? basic insulation ? iso 900 1 , tl 9000, iso 14001, qs 9000, ohsas 18001 certified manufacturing facility ? ul/ cul 60950 (us & canada) recognized options ? positive on/off logic ? smd or through hole mounting delphi series s48sa, 33w family dc/dc power modules : 48v in, 3.3v /10a out the delphi series s48sa, surface mountable, 48v input, single output, isolated dc/dc converters are the latest offering from a world leader in power system and technology and manufacturing C delta electronics, inc. this product fami ly provides up to 33 watts of power or up to 12a of output current (1.8v or below). with creative design technology and optimization of component placement, these converters possess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions. all models are protected from abnormal input/output voltage and current conditions. applications ? telecom/data com ? wireless networks ? optical network equipment ? server and data storage ? industrial/test equipment delta electronics, inc. d atasheet ds_s48sa3r310_ 101 1 2013
ds_s48sa3r310_ 101 1 2013 technical specificat ions (t a =25c, airflow rate=300 lfm, v in =48vdc, nominal vout unless otherwise noted . ) parameter notes and conditions s 48 s a 3r3 1 0nr fa min. typ. max. units absolute maximum ratings input voltage continuous 80 vdc transient (100ms) 100ms 100 vdc operating temperature refer to figure 18 for measuring point - 40 108 c storage temperature - 55 125 c input/output isolation voltage 1 minute 1500 vdc input characteris tics operating input voltage 36 48 75 v input under - voltage lockout turn - on voltage threshold 32.5 34 35.5 v turn - off voltage threshold 30.5 32 33.5 v lockout hysteresis voltage 1 2 3 v maximum input current 100% load, 36 vin 1. 3 a no - load input current 3 5 ma off converter input current 7 ma inrush current (i 2 t) 0.01 a 2 s input reflected - ripple current p - p thru 12h inductor, 5hz to 20mhz 5 ma input voltage ripple rejection 120 hz 50 db output characteristics ou tput voltage set point vin=48v, io=50%io.max, ta=25 3.2 5 3.30 3.3 5 v output voltage regulation over load io=io,min to io,max 2 1 0 mv over line vin= 36 v to 75 v 2 5 mv over temperature ta= - 40 to 85 100 300 ppm/ total output voltage range over sample load, line and temperature 3. 16 3. 4 4 v output voltage ripple and noise 5hz to 20mhz bandwidth peak - to - peak full load, 1f ceramic, 10f tantalum 50 100 mv rms full load, 1f ceramic, 10f tantalum 15 25 mv operating output current range 0 10 a output dc current - limit inception ou tput voltage 10% low 11 13 15 a dynamic characteristics output voltage current transient 48v, 1 0f tan & 1f ceramic load cap, 0.1 a/s positive step change in output current 50% io,max to 75 % io,max 35 100 mv negative step change in output cu rrent 75 % io,max to 50% io.max 35 100 mv settling time to 1 % of final value 200 s turn - on transient start - up time, from on/off control 6 12 ms start - up time, from input 6 12 ms maximum output capacitance full load; 5% overshoot of vout at startup 2 2 00 f efficiency 100% load 88 90.5 % isolation characteristics isolation voltage 1500 v isolation resistance 10 m isolation capacitance 1 500 pf feature characteristics switching frequency 330 khz on/off control, (logic low - module on) logic low von/off at ion/off=1.0ma 0 0 .8 v logic high von/off at ion/off=0.0 a 15 v on/off current ion/off at von/off=0.0v 1 ma leakage current logic high, von/off=15v 50 ua output voltage trim range a cross trim pin & + vo or C vo, pout Q max rated - 10 +10 % output over - voltage protection(hiccup) over full temp range; % of nominal vout 115 125 140 % gener al specifications mtbf io=80% of io, max; tc=40c 4.85 m hours weight 18 grams over - temperature shutdown refer to figure 18 for the measuring point 115 c 2
ds_s48sa3r310_ 101 1 2013 el ectrical characteris tics curves figure 1: efficiency vs. load current for minimum, nominal, and maximum input voltage at 25 c. figure 2: power dissipation vs. load current for minimum, nominal, and maximum input voltage at 25 c. figu re 3: typical input characteristics at room temperature. figure 4: turn - on transient at full rated load current (1 ms/div). top trace: vout (1v/div); bottom trace: on/off control (5v/div) . 3 50 55 60 65 70 75 80 85 90 95 1 2 3 4 5 6 7 8 9 10 output current (a) efficiency (%) 36vin 48vin 75vin 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1 2 3 4 5 6 7 8 9 10 output current (a) power dissipation (w) 36vin 48vin 75vin 0.0 0.2 0.4 0.6 0.8 1.0 1.2 30 35 40 45 50 55 60 65 70 75 input voltage (v) input current (a) io=10a io=6a io=1a
ds_s48sa3r310_ 101 1 2013 electrical character istics curves figure5 : turn - on transient at zero load current (1 ms/div). top trace: vout (1v/div); bottom trace: on /off control (5v/div) . figure 6: output voltage response to step - change in load current (50% - 75 % of i o, max; d i /dt = 0. 1a/s). load cap: 10f, 100 m ? top t race: vout ( 5 0mv/div), bottom t race: iout ( 5 a/div). figure 7 : output voltage response to step - change in load current ( 75 % - 50% of i o, max; d i /dt = 0. 1a/s). load cap: 10f, 100 m ? ceramic capacitor. top t race: vout (50mv/div), bottom t race: iout 5 a/div). figure 8: test set - up diagram showing measurement points for input reflected ripple current (figure 9 ). note: measured input reflected - ripple current with a simulated source inductance (l test ) of 12 h. capacitor cs offset possible battery impedance. 4
ds_s48sa3r310_ 101 1 2013 electrical character istics curves figure 9 : input reflected ripple current, i s , at full rated output current and nominal input voltage with 12 h source impedance and 33 f electrolytic capacitor ( 2 ma/div). figure 10: output voltage noise and ripple measurement test setup. scope mea surement should be made using a bnc cable (length short er than 20 inches). position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module. figure 11: output voltage ripple at nominal input voltage and rated load current ( 50 mv/div ). load capacitance: 1 f ceramic capacitor and 10 f tantalum capacitor. bandwidth: 20 mhz. figure 1 2 : output voltage vs. load current showing typical current limit curves and converter shutdown points. 5 strip copper vo(-) vo(+) 10u 1u scope resistive load 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 load current (a) output voltage (v) vin=48v
ds_s48sa3r310_ 101 1 2013 design consideration s input source impedance the impedance o f 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 c apacitor (esr < 0.7 at 100 khz) mounted close to the input of the module to improve the stability. layout and emc considerations deltas dc/dc power modules are designed to operate in a wide variety of systems and applications. for design assistance w ith emc compliance and related pwb layout issues, please contact deltas 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 re lease. safety considerations the power module must be installed in compliance with the spacing and separation requirements of the end - users safety agency standard if the system in which the power module is to be used must meet safety agency requirements . when the input source is 60vdc or below, 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 modules output to meet selv requirements, all of the following must be met: ? the input source must be insulated from any hazardous voltages, including the ac mains, with reinforced insulation. ? one vi pin and one vo pin are grounded, or all the input and output pins are kept floating . ? the input terminals of the module are not operator accessible. ? a selv reliability test is conducted on the system where the module is used to ensure that under a single fault, hazardous voltage does not appear at the modules output. do not ground on e of the input pins without grounding one of the output pins. this connection may allow a non - selv voltage to appear between the output pin and ground. 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 normal - blow fuse with 3 a maximum rating to be installed in the ungrounded lead. a lower rat ed fuse can be used based on the maximum inrush transient energy and maximum input current. soldering and cleaning considerations post solder cleaning i s 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 cleanin g 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 deltas technical support team. 6
ds_s48sa3r310_ 101 1 2013 features description s over - current protection the modules include an internal output over - current protection circuit , which will endure current limiting for an unlimit ed 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 exceed s the over - voltage set point, the module will shut down (hiccup mode). the modules will try to restart after shutdown. if the fault condition still exists, the module will shut down again. this restart trial will continue until the fault condition is corr ected. 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 try to restart a fter shutdown. if the over - temperature condition still exists during restart, the module will shut down again. this restart trial will continue until the temperature is within specification. remote on/off the remote on/off feature on the module can be ei ther 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 v i ( - ) terminal. the switch can be an open collector or open drain. for negative logic i f the remote on/off feature is not used, please short the on/off pin to vi( - ). for pos i tive logic i f the remote on/off feature is no t used, please leave the on/off pin floating . 7 figure 13 : remote on/off implementation remote sense (optional) 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(+) C vo( C )] C [sense(+) C sense( C )] 10% v out this limit includes any increase in voltage due to remote sense compensation and output voltage se t point adjustment (trim). figure 14 : 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( C ) to vo( C ) 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 usu ally 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. vo(+) vi(+) vo(-) sense(-) sense(+) vi(-) on/off vi(-) vi(+) vo(-) vo(+) sense(+) sense(-) resistance contact contact and distribution losses
ds_s48sa3r310_ 101 1 2013 8 ex. when trim - up +10% (3.3v x 1.1 = 3.63v ) care should be tak en to ensure that the maximum output power of the module remains at or below the maximum rated power. features description s (con.) output voltage adjustmen t (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 vo+ or vo - . the trim pin should be left open if this feature is not used. figur e 1 5 : circuit configuration for trim - down (decrease output voltage) if the external resistor is connected between the trim and vo - pins, the output voltage set point decreases. the external resistor value required to obtain a percentage of output voltage change vo% is defined as: ex. when trim - down C 10% (3.3v x 0.9 = 2.97v) figure 16 : circuit configuration for trim - up (increase output voltage) if the external resistor is connected between the trim and vo+ pins , the output voltage set point increases. the external resistor value require d to obtain a percentage output voltage change vo% is defined as: ? ? ?? ? ? 1 . 73 % vo 1690 %) vo 100 ( 5 . 45 up rtrim ? ? ? ? ? ? ? ?? 4 . 258 1 . 73 10 1690 ) 10 100 ( 5 . 45 up rtrim ? ? ? ? ? ? ? ? ?? ? 1 . 73 % vo 1690 down rtrim ? ? ? ? ? ?? 9 . 95 1 . 73 10 1690 down rtrim ? ? ? ?
ds_s48sa3r310_ 101 1 2013 thermal consideratio ns thermal management is an important part of the system design. to ensure proper, reliable operation, s ufficient 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 i s a wind tunnel. thermal testing setup deltas 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 or a heat sink is 6.35mm (0.25). thermal derating heat can be removed by increasing airflow over the module. t he modules maximum hot spot temperature is 108 . to enhance system reliability, the power mo dule should always be operated below the maximum operating temperature. if the temperature exceeds the maximum module temperature, reliability of the unit may be affected. figure 17 : win d tunnel test setup thermal derating curves figure 18: hot spo t temperature measured point the allowed maximum hot spot temperature is defined at 108 figure 1 9 : output c urrent vs. a mbient t emperature and a ir v elocity @ v in = 48 v 9 note: wind tunnel test setup figure dimensions are in millimeters and (inches) 10 (0.4) module air flow 50.8 (2.0) facing pwb pwb air velocity and ambient te mperature measured below the module s48sa3r310nr(standard) output current vs. ambient temperature and air velocity @ vin = 48v 0 1 2 3 4 5 6 7 8 9 10 11 55 60 65 70 75 80 85 90 95 100 105 ambient temperature ( ) output current(a) 200lfm 300lfm 100lfm natural convection 600lfm 400lfm 500lfm
ds_s48sa3r310_ 101 1 2013 pick and place locat ion surfa ce - mount tape & reel recommended pad layo ut (smd) 10
ds_s48sa3r310_ 101 1 2013 lea ded (sn/ pb ) process recommend temp. profile note: the temperature refers to the pin of s48sa, measured on the pin 1 (+vout ) joint. lead free (sac) proc ess recommend temp. profile note: the temperature refers to the pin of s48sa, measured on the pin 1 (+vout ) joint. 11 temp . time 150 200 100~140 sec. time limited 90 sec. above 217 217 preheat time ramp up max. 3 ramp down max. 4 peak temp. 240 ~ 245 25
ds_s48sa3r310_ 101 1 2013 mechanical drawing smd through - hole pin no. name function 1 +vout positive output voltage 2 - vout negative output voltage 6 trim output voltage trim 8 on/off on/off logic 11 - vin negative input voltage 12 +vin positive input voltage optional pin name func tion 4 +sense (option) positive sense pin 5 9 - sense (option) nc negative sense pin no connection 1 2
ds_s48sa3r310_ 101 1 2013 14 part numbering syste m s 48 s a 3r3 10 n r f a * form factor input voltage number of outputs product s e ries ou tput voltage output current on/off logic pin type option code s - small power 48v s - single a - advanced 1r2 - 1.2v 1r5 - 1.5v 1r8 - 1.8v 2r5 - 2.5v 3r3 - 3.3v 050 - 5.0v 120 - 12v 03 - 3.0v 06 - 6.6a 10 - 10a 12 - 12a n - negative p - positive r - smd t - through hole f - ro hs 6/6 (lead free) a - 9 pin, no sense b - 6 pin, no sense c - 9 pins with sense (12v has option b only) option code a includes 9 pins. pins 4, 5, and 9 have no connection . option code b excludes pin 4, 5 , and 9 (total 6 pins) . option code c features 9 pins with se nse function. model list model name input output eff @ 100% load s48s a1r212 n rfa 36v~75v 0.85a 1.2v 12a 84.0% s48s a1r512 n rfa 36v~75v 0.85a 1.5v 12a 88.0% s48s a1r812 n rfa 36v~75v 0.85 a 1.8 v 12 a 88.0 % s48s a2r510 n rfa 36v~75v 1.3a 2.5v 10a 88.5% s48s a 3r3 1 0 n rfa 36v~75v 1.3 a 3.3v 10a 90.5% s48s a05006 n rfa 36v~75v 1.3a 5.0 v 6.6a 90.5% s48s a12003 n rfb 36v~75v 1.3a 12v 3.0a 90.0% c ontact: www.deltaww.com/dcdc usa: telephone: east coast: 978 - 656 - 399 3 west coast: 510 - 668 - 5100 fax: (978) 656 3964 email: dcdc@delta - corp.com europe: p hone: +31 - 20 - 655 - 0967 fax: +31 - 20 - 655 - 0999 email: dcdc @ delta - es.com asia & the rest o f 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 . 1 3

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