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datasheet ds_q48s e 12025 _ 0 6 242 013 applications ? telecom / datacom ? wireless networks ? optical network equipment ? server and data storage ? industrial / test ing equipment options ? latched o ver voltage protection ? positive on/off logic ? heat spreader ava ilable for extended operation. features ? hig h e fficiency : 95.2 % @ 11.8 v/25a ? s ize: 57.9 x 36.8 x 11. 2 mm ( 2. 28 x1.45 x0. 44) (w/o heat spreader) 57.9*36.8*12.7mm (2.28*1.450.50) (with heat spreader) ? standard footprint ? industry standard pin out ? fixed frequency operation ? input uvlo, output o cp, ovp, otp ? hiccup output o ver current protection (ocp) ? hiccup output over voltage protection (ovp) ? auto recovery otp and input uvlo ? 2250v isolation and basic insulation ? no minimum load required ? iso 900 1 , tl 9000, iso 14001 , qs9000, ohsas18001 certified manufacturing facility ? ul/cul 60950 - 1 (us & canada) , en 60950 - 1, 2nd ed., including amendment 1 and 12 recognized delphi series q 48s e , quarter brick family dc/dc power modules: 3 8 ~75v in, 1 1.8 v/25a out, 300w the delphi series q48s e 12025 , quarter brick, 3 8 ~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 3 00 watts of power in an industry standard footprint and pin out. with c reative design technology and optimization of component placement , these converters possess outstanding electrical and thermal performances, as we ll as extremely high reliability under highly st ressful operating conditions. the q48 s e 12 025 offers more than 95. 2 % high efficiency at 25 a full load. the q48s e 120 25 is fully protected from abnormal input/output voltage, current, and temperature conditions and meets all safety requirements with basic ins ulation.
ds_q48s e 120 25 _ 0 6 24 2013 2 technical specificat ions ( t a =25c, airflow rate=300 lfm, v in =48vdc, nominal vout unless otherwise noted; parameter notes and conditions q48s e 120 25 (standa rd) min. typ. max. units absolute maximum ratings input voltage continuo us 80 vdc transient 100ms 100 vdc operating ambient temperature - 40 85 c storage temperature - 55 125 c input/output isolation voltage 2250 vdc input characteristics operating input voltage 38 48 75 vdc input under - voltage lockou t turn - on voltage threshold 32.0 3 4 .0 36.0 vdc turn - off voltage threshold 30.0 32.0 34.0 vdc lockout hysteresis voltage 2 vdc maximum input current 100% load, 3 8 vin 11 a no - load input current vin=48v, io=0a 160 ma off converter input c urrent vin= 4 8v, io=0a 10 ma inrush current (i 2 t) 1 a 2 s input reflected - ripple current p - p thru 12h inductor, 5hz to 20mhz 10 ma input voltage ripple rejection 120 hz - 30 db output characteristics output voltage set point vin=48v, io= 0 , tc=25c 11.67 11.8 1 1 . 92 vdc output voltage regulation over load vin=48v, io=io,min to io,max 3 0 8 0 mv over line vin= 38 v to 75v, io=io min 5 0 mv over temperature vin=48v , tc= - 40c to 85c 100 mv total output voltage range over sample loa d, line and temperature 11. 44 12. 16 vdc output voltage ripple and noise 5hz to 20mhz bandwidth peak - to - peak full load, 1f ceramic, 10f tantalum 1 20 mv rms full load, 1f ceramic, 10f tantalum 5 0 mv operating output current range 0 25 a o utput dc current - limit inception output voltage 10% low 110 1 4 0 % 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 300 mv negative step change in output current 75% io.max to 50% io.max 30 0 mv settling time (within 1% vout nominal) 300 s turn - on transient start - up time, from on/off control 70 ms start - up time, from input 80 ms maximum output capacitance low esr cap (oscon) , 100% load; 6 00 0 f efficiency 100% load vin=48v 95.2 % 60% load vin=48v 94.7 % isolation characteristics input to output 2250 vdc isolation resistance 10 m isolation capacitance 1 0 00 pf feature charac teristics switching frequency 1 6 0 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 50 v on/off control, positive remote on/off lo gic 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 50 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 ua output over - voltage protection over full temp range; % of nominal vout 115 1 40 % general specifications mtbf (with heat spreader) io=100 % of io, max; tc=40c ;airflow=600lfm 2.6 m hours weight (without heat spreader) 5 0.5 grams weight (with heat spreader) 65.5 grams over - temperature shutdown ( without heat spreader) refer to figure 18 for hot spot 1 location (48vin,80% io, 200lfm,airflow from vin+ to vin - ) 12 8 c over - temperature shutdown ( with heat spreader) refer to figure 20 for hot spot 2 location (48vin,80% io, 200lfm,airflow from vin+ to vin - ) 122 c over - temperature shutdown ( ntc resistor ) refer to figure 18 for ntc resistor location 127 note: please attach thermocouple on ntc resistor to te st otp function, the hot spots temperature is just for reference.
ds_q48s e 120 25 _ 0 6 24 2013 3 electrical character istics curves figure 1: efficiency vs. load current for minimum, nominal , and maximum input voltage at 8 5c . figure 2: power dissipation vs. load current for minimum, nominal, and maximum input voltage at 8 5c. figure 3: typical full load input characteristics at room temperature . 2 3 4 5 6 7 8 9 30 35 40 45 50 55 60 65 70 75 input voltage (v) input current (a)
ds_q48s e 120 25 _ 0 6 24 2013 4 electrical character istics curves for negative remote on/off logic figure 4: tu rn - on transient at zero load current) ( 2 0 ms/div). top trace: vout; 5 v/div; bottom trace: on/off input: 2 v/div . figure 5: turn - on transient at full rated load current ( 2 0 ms/div). top trace: vout: 5 v/div; bottom trace: on/off input: 2v/div . for input volt age start up figure 6 : turn - on transient at zero load current ( 2 0 ms/div). top trace: vout; 5 v/div; bottom trace: input voltage : 3 0 v/div . figure 7 : turn - on transient at full rated load current ( 2 0 ms/div). top trace: vout; 5 v/div; bottom trace: in put voltage : 30 v/div .
ds_q48s e 120 25 _ 0 6 24 2013 5 electrical character istics curves figure 8: output voltage response to step - change in load current (75% - 50% of io, max; di/dt = 0.1a/s). load cap: 10f, tantalum capacitor and 1f ceramic capacitor. top trace: vout; 100 mv /d iv; bottom trace: output current : 10a/div ; time: 200us/div figure 9: output voltage response to step - change in load current (50% - 75% of io, max; di/dt = 0.1a/s). load cap: 10f, tantalum capacitor and 1f ceramic capacitor. top trace: vout; 100 mv /div; bo ttom trace: output current : 10a/div ; time: 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 1 1: input terminal ripple current, i c , at full rated output current and nominal input voltage with 12h source impedance and 33 f electrolytic capacitor (2 00 ma/div 2us /div ).
ds_q48s e 120 25 _ 0 6 24 2013 6 electrical character istics curves figure 1 2: input reflected ripple current, i s , through a 12h source inductor at nominal input voltage and rated load current ( 2 0 ma/div 2 us /div ). figure 1 3: output v oltage noise and ripple measurement test setup . figure 14 : output voltage ripple at nominal input voltage and rated load current (io= 25 a) ( 2 0 mv/div , 2us /div ) load capacitance: 1f ceramic capacitor and 10f tantalum capacitor. bandwidth: 20 mhz. figure 15 : output voltage vs. load current showing typical current limit curves and converter shutdown points. 0 2 4 6 8 10 12 14 0 5 10 15 20 25 30 35 output current (a) output voltage (v)
ds_q48s e 120 25 _ 0 6 24 2013 7 design consideration s input source impedance the impedance of the input so urce 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 100f electrolytic capacitor (esr < 0.7 at 100 k hz) 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 with emc compliance and related p w b layout issues, please contact deltas 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 q 48s e 120 25 xxxx to meet class b in cisspr 22 schem atic and components list c x1 , c x2 is 1000nf ceramic caps ; c in 1 is 100nf ceramic cap ; c in2 is 100uf ceramic cap ; c y1 , c y2 is 0.1uf ceramic cap s ; l1 is common - mode inductor ,l1=809uh test result : vin=48v, io= 25 a quasi pe ak mode average mode 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 - 1, can/csa - c22.2 , no. 60950 - 1 and en60950 - 1+a11 an d iec60950 - 1 , 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 i s 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 modules output to meet selv requirements, all of the following must be met: ? the input source must be insulated from the ac mains by reinforced or double insulation. ? the input terminals of the module are not oper ator accessible. ? if the metal baseplate is grounded , the output must be also 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 doe s not appear at the modules 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 powe r 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 normal - blow fuse with 30a m aximum 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 assem bly 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 i mportant for un - encapsulated and/or open frame type power modules. for assistance on appropriate soldering and cleaning procedures, please contact deltas technical support team.
ds_q48s e 120 25 _ 0 6 24 2013 8 features description s over - current protection the modules include an internal output over - current protection circuit, which will endure current li miting for an unlimited duration during output overload. if the output current exceeds the ocp set point, the mo dules will shut down (hiccup mode) . the modules will try to restart after shutdown. if the overload condition still exists, the module will shu t 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 protection circui t will constrain the max duty cycle to limit the output voltage, if the output voltage continuously increases the modules will shut down, and then restart after a hiccup - time ( hiccup mode) . there is an option of latch mode. please contact with delta if needed. 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 m odule will shut down. the module will restart after 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 dur ing 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 d rain. 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 to floating . the on/off signal should be longer than 120 us, module will not response to the less than 120us on/off signals. it is better for customer to use on/off signal much longer than 120us, dc level on/off signal is suggested. figure 16 : remote on/off implementation
ds_q48s e 120 25 _ 0 6 24 2013 9 thermal consideratio ns thermal ma nagement 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. h ence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel. thermal testing setup deltas dc/dc power modules are characterized in heated vertical wind tunnels that simulate the thermal environments encount ered 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 mount ed 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). figure 17 : wind t unnel t est s etup 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. air flow module pwb 50.8(2.00") air velocity and ambient temperature sured below the module fancing pwb note: wind tunnel test setup figure dimensions are in millimeters and (inches)
ds_q48s e 120 25 _ 0 6 24 2013 10 thermal curves (with heat spreader) figure 20: * hot spot 2 temperature measured point. the allowed maximum hot spot 2 temperature is defined at 112 figure 21: output current vs. ambient temperature and air velocity @vin=48v(transverse orientation , airflow from vin+ to vin - ,with heat spreader ) thermal curves (without heat spread er) figure 18: * hot spot 1& ntc resistor temperature measured points. the allowed maximum hot spot 1 temperature is defined at 11 8 figure 19: output current vs. ambient temperature and air velocity @vin=48v(transverse orientation , airflow from vin+ to vin - ,without heat spreader ) airflow hot spot 2 0 5 10 15 20 25 25 30 35 40 45 50 55 60 65 70 75 80 85 output current(a) ambient temperature ( ) q48se12025(standard) output current vs. ambient temperature and air velocity @vin = 48v (transverse orientation,with heatspreader) natural convection 100lfm 200lfm 300lfm 400lfm 500lfm 600lfm airflow ntc resistor hot spot 1 0 5 10 15 20 25 25 30 35 40 45 50 55 60 65 70 75 80 85 output current(a) ambient temperature ( ) q48se12025(standard) output current vs. ambient temperature and air velocity @vin = 48v (transverse orientation) natural convection 100lfm 200lfm 300lfm 400lfm 500lfm 600lfm
ds_q48s e 120 25 _ 0 6 24 2013 11 mechanical drawing (with heat spreader) * for modules with through - hole pins and the optional heat spreader, they are intended f or wave soldering assembly onto system boards; please do not subject such modules through reflow temperature profile.
ds_q48s e 120 25 _ 0 6 24 2013 12 mechanical drawing (without heat spreader) pin no. name function 1 2 3 4 5 6 +vin on/off case - vin - vout +vout positive input voltag e remote on/off optional negative input voltage negative output voltage positive output voltage pin specification: pins 1 - 4 1.0 0 mm (0.040) diameter pins 5 & 6 2. 1.50 mm (0.0 59 ) diameter all pins are copper with tin plating and nickel over plating .
ds_q48s e 120 25 _ 0 6 24 2013 13 recommended layout
ds_q48s e 120 25 _ 0 6 24 2013 14 part numbering syste m q 48 s e 120 25 n r f a form factor input voltage number of outputs product s e ries output voltage output current on/off logic pin length o ption c ode q - quarter brick 48 - 3 8 v~75v s - single e - qb high power series 120 C 1 1.8 v 25 - 25 a n - negative p - positive k - 0.110 n - 0.146 r - 0.170 c - 0. 181 s - 0.189 t - 0. 220 l - 0. 248 f - rohs 6/6 (lead free) s pace - rohs5/6 a - std. function s without case pin h - with heat s preader and case pin n - with heat spreader without case pin model list model name input output eff @ 100% load q48 se 12025nrfa 3 8 v~75v 11a 11.8 v 25a 95 .2 % q48s e 12025nrfh 38 v~75v 11a 11.8 v 25a 95 .2 % q48s e 12025nrfn 38 v~75v 11a 11.8 v 25a 95 .2 % q48s e 1202 5nnfa 38 v~75v 11a 11.8 v 25a 95 .2 % 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 * for modules with through - hole pins and the optional heat spreader , they are intended for wave soldering assembly onto system boards; please do not subject such modules through reflow temperature profile. c ontact : www.deltaww.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: dc dc @ 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 informat ion 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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