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preliminary datasheet ds_q48sa52001_05142009 features ? high efficiency 91.0% @ 52v/1.15a ? size: 57.9x36.8x9.8mm (2.28?x1.45?x0.39?) ? standard footprint ? industry standard pin out ? fixed frequency operation ? input uvlo, output ocp, ovp, otp ? 2250v 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), and ce - pending applications ? telecom / datacom ? wireless networks ? optical network equipment ? server and data storage ? industrial / testing equipment options ? positive, negative, or no on/off ? otp and output ovp, ocp mode, auto-restart or latch-up ? short pin lengths delphi series q48sa, 60w quarter brick family dc/dc power modules: 36~7 5v in, 52v/1.15a out the delphi q48sa52001 series, quarter brick, 36~75v 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. the q48sa52001 product family operates from a wide 36~75v input voltage range and provides up to 60 watts of power in an industry standard footprint and pinou t. with creative design technology and optimization of component plac ement, 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_q48sa52001_05142009 2 technical specifications (t a =25c, airflow rate=300 lfm, v in =48vdc, nominal vout unless otherwise noted; parameter notes and conditions q48sa52001 (standard) min. typ. max. units absolute maximum ratings input voltage continuous 80 vdc transient (100ms) 100ms 100 vdc operating case temperature please refer to figure 19 -40 120 c storage temperature -55 125 c input/output isolation voltage 1 minute 2250 vdc input characteristics operating input voltage 36 48 75 vdc input under-voltage lockout turn-on voltage threshold 32 35 vdc turn-off voltage threshold 29 32 vdc lockout hysteresis voltage 2 4 vdc maximum input current 100% load, 36vin 2.4 a no-load input current 50 ma off converter input current vin=48v 8 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 50 db output characteristics output voltage set point vin=48v, io=io.max, tc=25c 51.0 52.0 53.0 vdc output voltage regulation over load io=io,min to io,max + 20 + 200 mv over line vin=36v to 75v + 20 + 200 mv over temperature tc=-40c to 120c 0.02 %vo/c total output voltage range over load, line and temperature 50.4 53.6 v output voltage ripple and noise 5hz to 20mhz bandwidth, with external output capacitors peak-to-peak full load (high frequency low esr) 500 700 mv rms 50 150 mv operating output current range 0 1.15 a output dc current-limit inception output voltage 10% low 1.27 1.65 a dynamic characteristics output voltage current transient 48v, 10f electrolytic & 1 f ceramic load cap, 0.1a/s positive step change in output current 50% to 75% io.max 750 mv negative step change in output current 75% to 50% io.max 750 mv settling time (within 1% vout nominal) s turn-on transient start-up time, from on/off control 25 100 ms start-up time, from input 25 100 ms external output capacitance full load; 5% overshoot of vout at startup 10 1000 f efficiency 100% load vin=48v 91.0 % 60% load vin=48v 90.0 % isolation characteristics input to output 2250 vdc isolation resistance 10 m ? isolation capacitance 2000 pf feature characteristics switching frequency 330 khz on/off control, negative remote on/off logic logic low (module on) von/off at io n/off=1.0ma 0 1.2 v logic high (module off) von/off at ion/off=0.0 a 3.5 20 v on/off control, positive remote on/off logic logic low (module off) von/off at io n/off=1.0ma 0 1.2 v logic high (module on) von/off at ion/off=0.0 a 3.5 20 v on/off current (for both remote on/off logic) ion/off at von/off=0.0v 1.0 ma leakage current (for both remote on/off logic) logic high, von/off=15v a output over-voltage protection(latch mode) over full temp range; 55 60 v general specifications mtbf io=80% of io, max; tc=40c tbd m hours weight 27.8 grams over-temperature shutdown please refer to figure 19 125 c
ds_q48sa52001_05142009 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 25 30 35 40 45 50 55 60 65 70 75 input voltage (v) input current (a) 1 figure 3: typical full load input characteristics at room temperature. 0 1 2 3 4 5 6 7 8 10 20 30 40 50 60 70 80 90 100 output current( a % ) power dissipation (w) 75vin 48vin 36vin 0 1 2 3 4 5 6 7 8 10 20 30 40 50 60 70 80 90 100 output current( a % ) power dissipation (w) 75vin 48vin 36vin 50 55 60 65 70 75 80 85 90 95 100 10 20 30 40 50 60 70 80 90 100 output current( a % ) efficiency (%) 1 36vin 48vin 75vin
ds_q48sa52001_05142009 4 electrical characteristics curves for negative remote on/off logic figure 4: turn-on transient at full ra ted load current (5ms/div). top trace: vout; 10v/div; bottom trace: on/off input: 5v/div. figure 5: turn-on transient at zero load current (5 ms/div). top trace: vout: 10v/div; bottom trace: on/off input: 5v/div. for input voltage start up figure 6: turn-on transient at full rated load current (5 ms/div). top trace: vout; 10v/div; bottom trace: input voltage: 50v/div. figure 7 : turn-on transient at zero load current (5 ms/div). top trace: vout; 10v/div; bottom trace: input voltage: 50v/div.
ds_q48sa52001_05142009 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 aluminum capacitor and 1f ceramic capacitor. top trace: vout (500mv/div), bo ttom trace: iout (500ma/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: 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 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_q48sa52001_05142009 6 electrical characteristics curves figure 11: input reflected ri pple current, i s , through a 12h source inductor at nominal input voltage and rated load current (20 ma/div 2us/div). figure 12: output voltage noise and ripple measurement test setup. 0 6 12 18 24 30 36 42 48 54 60 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 loa d current( a ) output voltage(v) 1 figure 13: output voltage ripple at nominal input voltage and rated load current (io=1.15a)(50 mv/div, 2us/div) load capacitance: 1f ceramic capacitor and 10f electrolytic capacitor. bandwidth: 20mhz. 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 14: output voltage vs. load current showing ty p ical current limit curves and converter shutdown points.
ds_q48sa52001_05142009 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 10 f 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, can/csa-c22.2, no. 60950-1, 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 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: ? 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. ? if the metal baseplate / heatspreader 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 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 normal-blow 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.
ds_q48sa52001_05142009 8 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 and latch off. the over-voltage latch is reset by either cycling the input power or by toggling the on/off signal for one second. also, an option of hiccup mode for ovp is available. under 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 protecti on consists of circuitry that provides protection from thermal damage. if the temperature exceeds the ov er-temperature threshold the module will shut down. the module will try to rest art after shutdown. if the over-temperature co ndition 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 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. figure 15: remote on/off implementation 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 vo(+) or vo(-).the trim pin should be left open if this feature is not used. figure 16: circuit configuration for trim-up (increase output voltage) if the external resistor is connected between the trim and vo(-) pin, the output voltage set point increases (fig. 17). the external resistor value required value required to obtain output voltage change u is defined as: ) ( 7 . 4 u 5 . 127 ? = ? k r up trim ex. when trim-up 5% u is 5%*vnormal=0.05*52.5=2.625 = ? = ? k r up trim 87 . 43 7 . 4 625 . 2 5 . 127
ds_q48sa52001_05142009 9 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 modul e. 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 t hat simulate the thermal environments encountered in most electronics equipment. this type of equipment commonly uses vertically mounted circuit card s 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 modul e 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 flo w 50.8 ( 2.0? ) facing pwb pwb air velocit y and ambient temperature measured below the module figure 18: 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. figure 17: circuit configuration for trim-down (decrease output voltage) if the external resistor is connected between the trim and vo(+), vout decreases (fig. 18). the external resistor value required to obtain output voltage change u is defined as: ) ( 7 . 55 51 * 51 ? = ? k u r down trim ex. when trim-down 15% u is 15%*vnormal=0.15*52.5=7.875 ) ( 6 . 274 7 . 55 875 . 7 51 * 51 = ? = ? k r down trim when using trim-up, 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_q48sa52001_05142009 10 thermal curves q48sa52001 (standard) output current vs. ambient temperature and air velocity @vin=48v (transverse orientation) 0 10 20 30 40 50 60 25 30 35 40 45 50 55 60 65 70 75 80 85 output power (w) ambient temperature ( ) natural convection 100lfm figure 19: temperature measurement location * the allowed maximum hot spot temperature is defined at 120 figure 20: output current vs. ambi ent temperature and air velocity @vin=48v(transverse orientation)
ds_q48sa52001_05142009 11 mechanical drawing pin no. name function 1 2 3 4 5 6 +vin on/off -vin -vout trim +vout positive input voltage remote on/off negative input voltage negative output voltage output voltage trim positive output voltage pin specification: pins 1-6 1.00mm (0.040?) diameter all pins are copper with tin plating.
ds_q48sa52001_05142009 12 part numbering system q 48 s a 520 01 n n a form factor input voltage number of outputs product series output voltage output current on/off logic pin length option code q - quarter brick 48 - 36~75v s - single a - advanced 520 - 52v 01- 1.15a n - negative r - 0.170? n - 0.145? space- rohs 5/6 f- rohs 6/6 (lead free) a - open frame model list model name input output eff @ 100% load q48sa52001nnfa 36v~75v 2.4 a 52v 1.15a 91% * for modules with through-hole pins and the optional heatspreader, they are intended for wave soldering assembly onto system boards; please do not subject such modules through reflow temperature profile. 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: 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 warrant y. complete warranty information is list ed on our web site or is available upon request from delta. information furnished by delta is believed to be accurate and re liable. however, no responsibility is assumed by delta for its use, nor for any infringements of patents or other rights of thir d 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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