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datasheet ds_e24sr12005_ 10282013 features ? high efficiency: 9 0 .5 % @ 12 v/ 5 a ? size : 58.4mm x 22.8mm x10.0 mm ( 2.30 x 0.90 x 0.3 9 ) ? smd and through - hole versions ? industry standard pin out ? 2:1 input range ? fixed frequency operation ? input uvlo , output otp, ocp, ovp ? b asic insulation ? 2250v isolation ? monotonic startup into normal and pre - biased loads ? output voltage trim : 1 0 % ? no minimum load required ? iso 900 1 , tl 9000, iso 14001 , qs 9000, ohsas 18001 certified m anufacturing fac ility ? ul/cul 60950 - 1 (us & canada) recognized applications ? telecom / datacom ? wireless networks ? optical network equipment ? server and data storage ? industrial / test equipment options ? positive on/off logic ? smd pin ? short pin lengths availabl e delphi series e 24 sr, 66 w eighth brick family dc/dc power modules: 24 v in, 12 v/ 5 a out the delphi series e24sr eighth brick, 24v input, single output , isolated dc/dc converters are the latest offering from a world leader in power systems technology an d manufacturing D delta electronics, inc. this product family is available in either a through - hole or surface - mounted package and provides up to 66 watts of power or 2 0a of output current ( 3.3v and below ) in an industry standard footprint and pinout. the e24sr converter operates from an input voltage of 18v to 36v and is available in output voltages from 3.3v to 12v. efficiency for the 12 v output is 9 0 .5 % at 5 a full load. with c reative design technology and optimization of component placement , these conver ters possess outstanding electrical and thermal performance, 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 delp hi series converters meet all safety requirements with basic insulation.
ds_e24sr12005_ 10282013 2 technical specificat ions ( t a =25c, airflow rate=300 lfm, v in = 2 4 vdc, nominal vout unless otherwise noted.) parameter notes and conditions e 24 sr 12005 (standard) min. typ. max. units absolute maximum ratings input voltage continuou s 36 vdc transient (100ms) 100ms 5 0 vdc operating temperature refer to figure 21 for measuring point 117 c storage temperature - 55 125 c input/output isolation voltage 2250 vdc input characteristics operating input voltage 18 36 vdc input under - voltage lockout turn - on voltage threshold 16 17 1 7.8 vdc turn - off voltage threshold 15 16 17 vdc lockout hysteresis voltage 0. 7 1 1.5 vdc maximum input current 100% load, 18 vin 3. 8 a no - load input current 15 0 180 ma off converter input current 3 10 ma inrush current (i 2 t) 0. 1 a 2 s input reflected - ripple current p - p thru 12h inductor, 5hz to 20mhz 1 0 ma input voltage ripple rejection 120 hz 55 db output characteristics output voltage set point vin= 2 4 v, i o=io.max, tc=25c 11.82 12 12.18 vdc output voltage regulation over load io=io, min to io, max 3 10 mv over line vin= 18 v to 36 v 3 10 mv over temperature tc= - 40c to 100 c 100 mv total output voltage range over sample load, line and tempera ture 11.76 12.24 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 3 0 mv operating output current range 0 5 a output over current protection output voltage 10% low 110 1 4 0 % dynamic characteristics output voltage current transient 1 0f tan & 1f ceramic load cap, 0.1 a/s positive step change in output current 50% io.max to 75% io.max 180 250 mv negative step change i n output current 75% io.max to 50% io.max 1 8 0 250 mv settling time (within 1% vout nominal) 150 us turn - on transient start - up time, from on/off control 5 ms start - up time, from input 5 ms back bias start - up ? 90% of nominal output volta ge back drive current limit while pin on - off is enabled io=0a 0.1 a back drive current limit while pin on - off is disabled io=0a 50 ma maximum output capacitance full load; 5% overshoot of vout at startup 2000 f efficiency 100% load 9 0 .5 % 60% load 90 % isolation characteristics input to output 2250 vdc isolation resistance 10 m isolation capacitance 1 5 00 pf feature characteristics switching frequency 35 0 khz on/off control , negative remote on/off logic logic low (module on) - 0.7 0. 5 v logic high (module off) 3 18 v on/off control, positive remote on/ off logic logic low (module off) - 0.7 0.5 v logic high (module on) 3 18 v on/off pin open circuit voltage 9.6 v on/off pin pull down resistance 12 kohm output voltage trim range pout Q max rated power - 10 +10 % output voltage remote s ense range pout Q max rated power +10 % output over - voltage protection over full temp range; 13.8 16.8 v general specifications mtbf io=80% of io, max; ta=25c , 300lfm airflow 2.81 m hours weight 22.0 grams over - temperature shutdown refer to figure 21 for measuring point 130 c
ds_e24sr12005_ 10282013 3 electrical character istics 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 maxim um input voltage at 25c. figure 3: typical full load input characteristics at room temperature 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 18 20 22 24 26 28 30 32 34 36 input voltage (v) inputt current(a)
ds_e24sr12005_ 10282013 4 electrical character istics curves for negative remote on/off logic figure 4: turn - on transient at full rated load current (resistive loa d) ( 2 ms/div). vin=2 4 v. top trace: vout , 5 .0 v/div; bottom trace: on/off input, 10v/div figure 5: turn - on transient at zero load current ( 2 ms/div). vin=2 4 v. top trace: vout: 5 .0 v/div , bottom trace: on/off input , 10v/div for positive remote on/off logi c figure 6 : turn - on transient at full rated load current (resistive load) ( 2 ms/div). vin=2 4 v. top trace: vout , 5 .0 v/div; bottom trace: on/off input , 10 v/div figure 7: turn - on transient at zero load current ( 2 ms/div). vin=2 4 v top trace: vout , 5 . 0 v/div; bottom trace: on/off input , 10 v/div 0 0 0 0 0 0 0 0
ds_e24sr12005_ 10282013 5 electrical character istics 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 capa citor. top trace: vout (10 0mv/div, 200us /div ), bottom trace: iout ( 2 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: out put voltage response to step - change in load current (75% - 50% - 75% of io, max; di/dt = 1 a/s). load cap: 470f, 35m ? esr solid electrolytic capacitor and 1f ceramic capacitor. top trace: vout (10 0mv/div, 200us /div ), bottom trace: iout ( 2 a/div). scope measu rement 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 figure 1 1: input terminal ripple curre nt, i c , at full rated output current and nominal input voltage with 12h source impedance and 33f electrolytic capacitor (2 00 ma/div , 2us /div ) 0 0 hot spot 0 hot spot 0 hot spot 0
ds_e24sr12005_ 10282013 6 electrical character istics curves figure 1 2: input reflected ripple current, i s , through a 12h sour ce inductor at nominal input voltage and rated load current (20 ma/div , 2us /div ) figure 1 3: output voltage noise and ripple measurement test setup figure 14 : output voltage ripple at nominal input voltage and rated load current (io= 5 a) ( 2 0 mv/di v , 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 th e module figure 15 : output voltage vs. load current showing typical current limit curves and converter shutdown points 0 0 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 0 1 2 3 4 5 6 7 8 load current (a) output voltage (v) strip copper vo(-) vo(+) 10u 1u scope resistive load
ds_e24sr12005_ 10282013 7 safety considerations the power module must be installed in compliance with the spacing and separation requirements of the end - users safety agency standard, i.e., ul60950, for the modules output to meet selv requirements, ? the input source m ust be insulated from the ac mains by reinforced or double insulation. ? the input terminals of the module are not operator accessible. ? if the metal baseplate is grounded , o ne vi pin and one vo pin shall also be grounded. ? 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 modules 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 reliabilit y 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 procedu res, please contact deltas technical support team. design consideration s 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 - impedanc e 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 layout and emc considerations deltas dc/dc power modules are designed to layout issues, please contact deltas technical support schematic and components list cin is 100uf*2 low esr aluminum cap; cx is 2.2uf ceramic cap; cy1 are 10 nf ceramic caps; cy2 are 10nf ceramic caps; cy is 1nf ceramic cap; l1 is common - mode inductor, l1=0.53mh; test result : vin= 24 v, io= 5 a , yellow line is quasi peak mode; blue line is average mode
ds_e24sr12005_ 10282013 8 features description s 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, and enter 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 po int, 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 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 try to restart after shutdown. if the ove r - 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 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 termin al 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 not used, please leave the on/off pin floating . 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 ter minals 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 set point adjustment (trim). 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( C ) to vo( C ) at the module . the output voltage can be increased by both the remote sense and the trim; however, the maximum increa se 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 shou ld be taken to ensure that the maximum output power does not exceed the maximum rated power. vi( - ) on/off vi(+) vo( - ) trim vo(+) sense( - ) sense( - ) vi( - ) on/off vi(+) vo( - ) trim vo(+) sense( - ) sense( - ) vi( - ) on/off vi(+) vo( - ) trim vo(+) r load sense( - ) sense( - ) distribution resistance vi( - ) on/off vi(+) vo( - ) trim vo(+) r load sense( - ) sense( - ) distribution resistance
ds_e24sr12005_ 10282013 9 features description s (con.) output voltage adjustment (trim) to increase or decrease the output voltage set point, connect an external resistor between the tri m 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 ex. when trim - down - 10% ( 12 v0.9= 10.8 v) figur e 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 require d to obtain a percentage output vo ltage change ? ? ? ? ? ? ? ? ? ? ? ? ? k down rtrim 2 . 10 511 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? k k down rtrim 9 . 40 2 . 10 10 511 ? ? ? ? ? ? ? ? ? ? ? k up rtrim 2 . 10 511 1.225 ) (100 vo 11 . 5 ? ? ? ? ? ? ? ? ? ? ? ? k up rtrim 3 . 489 2 . 10 10 511 10 225 . 1 ) 10 100 ( 12 11 . 5
ds_e24sr12005_ 10282013 10 thermal consideratio ns 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 t emperature 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 deltas dc/dc power modu les 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 mo unted. 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 ke pt at 6.35mm (0.25). figure 20 : wind tunnel test setup figure 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 temperat ure. 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 117 figure 2 2: output c urrent vs. ambient temperature and air velocity @v in = 2 4 v (transverse orientation ) note: wind tunnel test setup figure dimensions are in millimeters and (inches) 12.7 (0.5) module air flow 50.8 (2.0) facing pwb pwb air velocity and ambient temperature measured below the module e24sr12005(standard) output current vs. ambient temperature and air velocity @vin = 24v (transverse orientation) 0 1 2 3 4 5 25 30 35 40 45 50 55 60 65 70 75 80 85 ambient temperature ( ) output current(a) natural convection 100lfm 200lfm
ds_e24sr12005_ 10282013 11 pick and place locat ion surf ace - mount tape & reel recommended pad layo ut (smd)
ds_e24sr12005_ 10282013 12 lea ded (sn/ pb ) process recommend temp. profile note: the temperature refers to the pin of e24sr, measured on the pin +vout joint. lead free (sac) proc ess recommend temp. profile note: the temperature refers to the pin of e24sr, measured on the pin +vout joint. 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_e24sr12005_ 10282013 13 mechanical drawing s urface - mount module t hrough - hole module pin no. name fun ction 1 2 3 4 5 6 7 8 - vin on/off +vin +vout +sense trim - sense - vout negative input voltage remote on/off positive input voltage positive output voltage positive remote sense output voltage trim negative remote sense negative output voltage
ds_e24sr12005_ 10282013 14 part numb ering system e 24 s r 120 05 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 24 - 18v~36v s - single r - regular 120 - 12 v 05 - 05 a n - negati ve p - positive r - 0.170 n - 0.145 k - 0.110 m - smd f - rohs 6/6 (lead free) a - standard functions model list model name input output eff @ 100% load e 24 sr0 6508 nrfa 18v~36v 3.4 a 6.5 v 8 a 9 0.5 % e24sr12005nrfa 18v~36v 4a 12v 5a 9 0.5 % default remot e 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 . c ontact: www.delta ww.com/dcdc usa: telephone: east coast: 978 - 656 - 3993 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 of world : telephone: +886 3 4526107 x 6220 ~6224 fax: +886 3 4513485 email: dcdc@delta.com.tw warranty delta offers a two ( 2) year limited warranty. complete wa rranty 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 it s 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 specificatio ns at any time, without notice .

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