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datasheet ds_t48sr3r307_10162012 applications ? telecom / datacom ? wireless networks ? optical network equipment ? server and data storage ? industrial / testing equipment options ? latched over voltage protection ? positive on/off logic features ? high efficiency : 86% @ 3.3v/7.5a ? size: 19.1mmx23.4mmx8.9mm (0.92?x0.75?x0.35?) ? standard footprint ? fixed frequency operation ? hiccup output over current protection (ocp) ? hiccup output over voltage protection (ovp) ? auto recovery otp ? input uvlo ? output voltage trim:-20%,+10% ? pre-biased loads ? 1500v isolation and basic insulation ? no minimum load required ? iso 9001, tl 9000, iso 14001, qs9000, ohsas18001 certified manufacturing facility ? ul/cul 60950-1 (us & canada) recognized delphi series t48sr, 1/32 brick family dc/dc power modules: 36~75v in, 3.3v/7.5a out, 24.75w the delphi series t48sr3r307, 1/32 brick, 36v~75v input, single output, isolated dc/dc converter is the latest offering from a world leader in power system and technology and manufacturing D delta electronics, inc. this product provides up to 24.75 watts of power in an industry standard footprint and pin out. 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. the t48sr3r307 offers more than 86% high efficiency at 7.5a full load.
ds_ t48sr3r307_10162012 2 technical specifications (t a =25c, airflow rate=300 lfm, v in =48vdc, nominal vout unless otherwise noted; parameter notes and conditions t48sr3r307 (standard) min. typ. max. units absolute maximum ratings input voltage continuous 80 vdc transient 100ms 100 vdc operating temperature -40 85 c storage temperature -55 125 c input/output isolation voltage 1500 vdc input characteristics operating input voltage 36 48 75 vdc input under-voltage lockout turn-on voltage threshold 32.5 34 35.5 vdc turn-off voltage threshold 30.5 32 33.5 vdc lockout hysteresis voltage 1 2 5 vdc maximum input current 100% load, 36vin 1 a no-load input current vin=48v, io=0a 40 ma off converter input current vin=48v, io=0a 9 ma inrush current (i 2 t) 1 a 2 s input reflected-ripple current p-p thru 12h inductor, 5hz to 20mhz 40 ma input voltage ripple rejection 120 hz -50 db output characteristics output voltage set point vin=48v, io=0, tc=25c 3.25 3.3 3.35 vdc output voltage regulation over load vin=48v, io=io,min to io,max ? 5 ? 10 mv over line vin=36v to 75v, io=io max ? 5 ? 10 mv over temperature vin=48v, tc=-40c to 85c ? 10 mv total output voltage range over sample load, line and temperature 3.2 3.4 vdc output voltage ripple and noise 5hz to 20mhz bandwidth peak-to-peak full load, 400f ceramic 25 mv rms full load, 400f ceramic 5 mv operating output current range 0 7.5 a output dc current-limit inception output voltage 10% low 110 160 % dynamic characteristics output voltage current transient 48v, 400f ceramic load cap, 1a/s positive step change in output current 50% io.max to 75% io.max 115 mv negative step change in output current 75% io.max to 50% io.max 115 mv settling time (within 1% vout nominal) 130 s turn-on transient start-up time, from on/off control 10 30 ms start-up time, from input 15 30 ms maximum output capacitance full load; 0 400 5000 f efficiency 100% load vin=48v 86 % 60% load vin=48v 85 % isolation characteristics input to output 1500 vdc isolation resistance 10 m ? isolation capacitance 1300 pf feature characteristics switching frequency 480 khz on/off control, negative remote on/off logic logic low (module on) von/off at ion/off=1.0ma 0 0.8 v logic high (module off) von/off at ion/off=0.0 a 2.4 5 v on/off control, positive remote on/off logic logic low (module off) von/off at ion/off=1.0ma 0 0.8 v logic high (module on) von/off at ion/off=0.0 a 2.4 5 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=5v ua output over-voltage protection 120 140 % general specifications mtbf vin=48v; io=80% of io, max; ta=25c; 100lfm 5.3 m hours weight(open frame) 8.2 grams over-temperature shutdown (hot spot) refer to figure 24 for hot spot location (48vin,80%io, 200lfm,airflow from vin+ to vin-) 128 c over-temperature shutdown (ntc resistor) refer to figure 24 for ntc resistor location 125 c note: please attach thermocouple on ntc resistor to test otp function, the hot spot?s temperature is just for reference.
ds_ t48sr3r307_10162012 3 electrical characteristics curves 50 55 60 65 70 75 80 85 90 0.75 1.5 2.25 3 3.75 4.5 5.25 6 6.75 7.5 output current( a ) efficiency(%) 36vin 48vin 72vin 1.000 2.000 3.000 4.000 0.75 1.5 2.25 3 3.75 4.5 5.25 6 6.75 7.5 output current( a ) power dissipation(w) 36vin 48vin 72vin figure 1: efficiency vs. load current for minimum, nominal, and maximum input voltage. figure 2: power dissipation vs. load current for minimum, nominal, and maximum input voltage. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 30 35 40 45 50 55 60 65 70 75 input v ol ta ge ( v ) input current (a) figure 3: typical full load input characteristics.
ds_ t48sr3r307_10162012 4 electrical characteristics curves for negative remote on/off logic figure 4: turn-on transient at zero load current) (4ms/div). top trace: vout; 1.5v/div; bottom trace: on/off input: 5v/div. figure 5: turn-on transient at full rated load current (4 ms/div). top trace: vout: 1.5v/div; bottom trace: on/off input: 5v/div. for input voltage start up figure 6: turn-on transient at zero load current (10 ms/div). top trace: vout; 1.5v/div; bottom trace: input voltage: 30v/div. figure 7 : turn-on transient at full rated load current (10 ms/div). top trace: vout; 1.5v/div; bottom trace: input voltage: 30v/div.
ds_ t48sr3r307_10162012 5 electrical characteristics curves figure 8: output voltage response to step-change in load current (75%-50% of io, max; di/dt =1a/s). load cap: 400f, ceramic capacitor. top trace: vout (100mv/div,200us/div); bottom trace: output current(1.5a/div, 200us/div) figure 9: output voltage response to step-change in load current (50%-75% of io, max; di/dt =1a/s). load cap: 400f ceramic capacitor. top trace: vout (100mv/div,200us/div); bottom trace: output current(1.5a/div, 200us/div) 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 11: top trace: input terminal ripple current, i c , at full rated output current and nominal input voltage with 12h source impedance and 100f electrolytic capacitor (2a/div ? 2us/div), setup is shown in figure 10 top picture. bottom trace: input terminal ripple current, i c , at full rated output current and nominal input voltage with 12h source impedance and 100f electrolytic capacitor (2a/div ? 2us/div), setup is shown in figure 10 bottom picture, there is one 1uh inductor in front of module input side.
ds_ t48sr3r307_10162012 6 electrical characteristics curves figure 12: input reflected ripple current, i s , through a 12h source inductor at nominal input voltage and rated load current (25 ma/div ? 2us/div), setup is shown in figure 10 top picture. figure 13: output voltage noise and ripple measurement test setup. 0 1 2 3 4 012345678910 output current (a) output voltage (v) figure 14: output voltage ripple at nominal input voltage and rated load current (io=7.5a)(10 mv/div, 2us/div) load capacitance: 400f ceramic capacitor. bandwidth: 20 mhz. figure 15: output voltage vs. load current showing typical current limit curves and converter shutdown points.
ds_ t48sr3r307_10162012 7 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 100 f electrolytic capacitor mounted close to the input of the module to improve the stability. module internal input filter is only one 1uf ceramic cap, not l-c filter or pi filter, so the external input cap esr loss need be paid more attention. a external inductor (1uh) placed in front of module can decrease esr loss of the external input cap. 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. below is the reference design for an input filter tested with t48sr3r307xxxx to meet en55022 (vde0878) class a(both q. peak and average) schematic and components list figure 16 : capacitive and inductive emi filter c1=47uf /100 v(low esr) c2=c3= 47 uf/100 v(low esr) c4=c5=2200pf t1=0.59mh type p0353 (pulse) test result: at t = +25 c , vin = 48 v and io=7.5 a blue line is quasi peak mode; green line is average mode. figure 17: emi test negative line @ t = +25 c and vin = 48 v figure 18: emi test positive line @ t = +25 c and vin = 48 v 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_ t48sr3r307_10162012 8 features descriptions ? 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 fast-acting fuse with 20a 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. 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 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 modules will shut down, and then restart after a hiccup-time (hiccup mode). if customer needs a latch mode, please contact to delta. 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, and enter in auto-restart mode. for auto-restart mode, the module will detect temperature after shutdown. if the over temperature condition still exists, the module will remain shutdown. this restart trial will continue until the over-temperature condition is corrected. 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 19: 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
ds_ t48sr3r307_10162012 9 features descriptions (con.) 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 20: 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. 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 21: 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 22: 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: rtrim_up 865.7 ? 3.547 + ? ? ? ? k ? ex. when trim-up +10%(3.3v1.1=3.63v) rtrim_up 865.7 10 3.547 + 90.117k ? 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_ t48sr3r307_10162012 10 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??). air flow modu le pw b 50 . 8 (2 . 0 0") air velocity a n d am bi e nt temperature sured below the module fa ncing pw b note: wind tunnel test setup figure d im ensions are in millimeters and (inches) figure 23: 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 ntc resistor airflow hot spot figure 24: * hot spot& ntc resistor temperature measured points. t4 8sr 3r3 0 7( stan da rd ) o utp ut cu rr en t vs . am b i en t t em p er at ur e a nd a i r ve l oci t y @vin = 48v (either orientation) 0 1 2 3 4 5 6 7 8 25 30 35 40 45 50 55 60 65 70 7 5 80 85 a mbient t empe ratur e ( j ) outpu t c urren t (a ) na tu ra l co nv ect i on 100lfm 20 0l fm figure 25: output current vs. ambient temperature and air velocity @vin=48v(either orientation, without heat spreader)
ds_ t48sr3r307_10162012 11 mechanical drawing note: all pins are copper alloy with matte tin over ni plating .
ds_ t48sr3r307_10162012 12 part numbering system t 48 s r 3r3 07 n n f a form factor input voltage number of outputs product series output voltage output current on/off logic pin length option code t ? 1/32 brick 48-36v~75v s - single r- series number 3r3 ? 3.3v 07 ? 7.5a n - negative p - positive n - 0.146? r - 0.170? f - rohs 6/6 (lead free) space - rohs5/6 a - std. functions model list model name input output eff @ 100% load t48sr3r307nnfa 36v~75v 1a 3.3v 7.5a 86% T48SR05005NNFA 36v~75v 1a 5v 5a 86% 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 contact : www.delta.com.tw/dcdc usa: telephone: east coast: 978-656-3993 west coast: 510-668-5100 fax: (978) 656 3964 email: dcdc@delta-corp.com europe: phone: +41 31 998 53 11 fax: +41 31 998 53 53 email: dcdc@delta-es.com 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 grante d 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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