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q48sc120 25 3 00 w dc /dc power modules da tasheet e - mail : dcdc@deltaww.com ds_ q48sc120 2 5 _ 0 4062017 http://www.deltaww.com/dcdc p 1 features ? input voltage range: 3 6 v~ 75 v ? output voltage range ( trim and pmbus) 8 v~ 13.2 v ? fully regulated from 36 to 75vin ? high efficiency : 95. 1 % @ 48vin/ 25 a ? size: 58.4mm x 36.8mm x 1 1.2 mm (2.3 x 1.45 x 0. 44 ) (with out heat - spreader) 58.4mm x 36. 8mm x 12.7mm (2.3 x 1.45 x 0.5) (with heat - spreader) ? industry standard dosa compliant pin out ? fully protected: input uvlo, output ocp and o v p , o t p ? droop current sharing ? 1 5 0 0 v isolation ? no minimum load required ? fixed frequency operation ? iso 9001, tl 900 0, iso 14001, qs9000, ohsas18001 certified manufacturing facility ? ul/ c ul 60950 - 1 (us & canada) delphi series q48sc120 25 , quarter brick family dc/dc power modules: 36 ~ 75 vin, 12 vout, 3 00 w th e delphi series q48sc120 25 , quarter brick, 36~75v input, single output 12 v, are full digital control dc/dc converter , and are 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 at 36~75v input in an industry standard , dosa compliant footprint and pin out. the q48sc120 25 offers more tha n 95 . 1 % high e fficiency at 48v input, 12v output and 25 a load . there is a built - in digital pwm controller in the q48sc120 25 series, which is used to complete the vo feedback, pwm signal generation, droop current sharing, fault protection, output voltage trim, on/off control and pmbus communications, and so on. with the digital c ontrol, many design and application flexibility, advanced performance, and reliability are obtained. the q48sc120 25 can be connected in parallel directly for higher power without adding external oring - fet. options ? positive or negative on/off logic ? droo p current sharing ? digital pins ? heat spreader applications ? datacom / networking ? wireless n etworks ? optical network e quipment ? server and data s torage ? industrial / test e quipmen t
datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 2 technical specifications (t a =25c , airflow rate= 4 00 lfm, v in = 48 vdc, nominal vout unless otherwise noted. ) parameter notes and conditions q 48s c 12 0 25 min. typ. max. units absolute maximum ratings input voltage continuous 0 75 vdc transient (100ms) 100ms 100 vdc on/off pin voltage - 50 50 v other pin voltage trim/current sharing, c2, data, smbalert, clock, addr1, addr0 - 0.3 3 .6 v output negative voltage 0.3 v operating ambient 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 (adjustable via pmbus, vin_on) 34 36 vdc turn - off voltage threshold (adjustable via pmbus, vin_off) 31 34 vdc lockout hysteresis voltage 2 vdc maximum input current vin= 3 6 v, 100% load 11 a no - load input current vin= 48 v 80 110 140 ma off converter input current vin= 48 v 10 18 26 ma input capacitance 100 uf inrush current (i 2 t) 1 a2s input reflected - ripple current p - p thru 12h inductor, 5hz to 20mhz 50 ma input voltage ripple rejection 120hz 50 db o utput characteristics the module without droop current sharing option code output voltage set point (adjustable via pmbus) vin= 48 v, io=0a , ta=25c 11.88 12 12.12 vdc output voltage regulation over line vin= 36 v to 75v, io=100% load 40 mv over load vin= 36 v to 75v, io=io,min to io,max 40 mv over tempearture vin= 36 v to 75v, io=100% load, ta= - 40c to 85c 120 mv the module with droop current sharing option code o u tput voltage set point (adjustable via pmbus) vin= 48 v, io=0a , ta=25c 12.28 12.4 12.52 vdc output voltage regulation over line vin= 36 v to 75v, io=100% load 40 mv over load vin= 36 v to 75v, io=io,min to io,max - 650 - 55 0 mv over tempearture vin= 36 v to 75v, io=100% load, ta= - 40c to 85c 120 mv both wit h and without droop current sharing option code o utput v oltage trim and pmbus range vin=36v to 75v, pout Q max rated power,io Q io.max - 33.3 10 % output voltage remote sense range (note 2) vin=36v to 75v, pout Q max rated power,io Q io.max 5.8 1 0 % output over - voltage lockout (adjustable via pmbus, vout_ov_fault_limit) 15.2 vdc operating output current range full input voltage range 0 25 a output dc current - limit inception 115 135 % output capacitance 300 15000 f output voltage ripp le and noise vin= 48 v , full load, 20mhz bandwidth peak - to - peak co= 300 uf/ 16 v (polymer ) + 10u/16v (tantalum capacitor) +1u/16 v ( c eramic ) 75 11 0 mv rms co= 300 uf/ 16 v (polymer ) + 10u/16v (tantalum capacitor) +1u/16 v ( c eramic ) 2 2 3 2 mv dynamic char acteristics output voltage current transient vin=48v, load slew rate 0.1 a/s with a 1uf ceramic , a 10uf tantalum, and a 300uf polymer capacitor positive step change in output current 50 % io.max to 75 % io.max 350 500 mv negative step change in output current 75 % io.max to 50 % io.max - 500 - 350 mv settling time (within 1% vout nominal) 5 00 s turn - on transient (adjustable via pmbus) start - up time, from on/off control f rom on/off to 9 0%vo final value 55 ms start - up time, from input f rom input to 9 0%vo final value 75 ms output voltage rise time f rom 1 0%vo final value to 9 0%vo final value 30 ms efficiency 100% load vin= 48v 95. 1 % 6 0% load vin= 48v 95. 6 % isolation characteristics input to output 1500 vdc is olation resistance 10 m isolation capacitance 6800 pf
datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 3 technical specifications (t a =25c, airflow rate= 4 00 lfm, v in = 48 vdc, nominal vout unless otherwise noted.) digital interface specifications (t a =25c , airflow rate= 4 00 lfm, v in = 48 vdc, nominal vout unless otherwise noted.) pin de fina tion pin# name function pin# name f unction 1 vin(+) 9 vout(+) 2 on/off primary on/off control pin 10 c2 pgood pin , and this pin also could be configurated as secondary on/off control pin 3 case 11 sig_gnd signal ground 4 vin( - ) 12 data pmbus data line 5 vout( - ) 13 smbalert pmbus s mbalert line 6 sense( - ) remote sense 14 clock pmbus clock line 7 trim trim note 3 15 addr1 addr1 pin sets the high order digit of the address. 8 sense(+) remote sense 16 addr0 addr0 pin sets the low order digit of the address. note 3 : s ee the last pag e. parameter notes and conditions q 48s c 120 25 min. typ. max. units feature characteristics switching frequency 130 k hz on/off control, remote on/off logic default negative logic logic low (module on ) von/off at ion/off=1.0ma - 0.7 0.8 v logic high (module o ff ) von/off at ion/off=0.0 a 3.5 50 v on/off current (for both remote on/off logic) ion/off at von/off=0.0v 0. 5 ma general specifications mtbf io=80% of io max ; ta=25c ; ai rflow=3 00lfm 4.5 m weight (without heat spreader) 50 grams weight (with heat spreader) 6 5 grams over - temperature shutdown ( without heat spreader) refer to figure 22 for hot spot 1 location (48vin,80% io, 200lfm,airflow from vin+ to vin - ) 126 c over - temperature shutdown ( with heat spreader) refer to figure 2 4 for hot spot 2 location (48vin,80% io, 200lfm,airflow from vin+ to vin - ) 114 c over - temperature shutdown ( ntc resistor ) refer to figure 22 for ntc resistor locatio n 125 c note 1 : please attach thermocouple on ntc resistor to test otp function, the hot spots temperature is just for reference. and the parameter notes and conditions q 48s c 120 25 min. typ. max. units pmbus signal interface characteristics input high volt age (clk, data) 2.1 3. 3 vdc input low voltage (clk, data) 0 0.8 vdc input high level current (clk, data) - 10 10 ua input low level current (clk, data) - 10 10 ua output low voltage (smbalert#) smbalert, sink current 2ma 0.4 vdc output high le vel open drain leakage current (smbalert#) smbalert, 3.6v 0 10 ua pmbus operating frequency range 100 or 400 khz measurement system characteristics output current reading accuracy 12.5a< iout <25 a - 5 1.4 3 % 1a datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 4 s i mplified a pplication circuit vout(+) trim addr0 addr1 on/off delta dc/dc module emi filter fuse lo ad input source system mcu clock data c2 smb - alert clk data pgood / on/off alert on/off control vin( - ) sense( - ) sense(+) vout( - ) vin(+) reverse voltage protect resistance of trace resistance of trace case
datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 5 electrical character istics curves figure 1: efficiency vs. load current for minimum, nominal, and maximum input voltage at 25c. figu re 2: power loss vs. load current for minimum, nominal, and maximum input voltage at 25c. figure 3: typical full load input characteristics at room temperature. 80 82 84 86 88 90 92 94 96 98 3 6 9 12 15 18 21 24 output current (a) efficiency(%) 36v 75v 48v 2 4 6 8 10 12 14 16 18 20 22 3 6 9 12 15 18 21 24 output current(a) power dissipation (w ) 36v 48v 75v 0 2 4 6 8 10 25 30 35 40 45 50 55 60 65 70 75 input voltage(v) input current(a)
datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 6 electrical character istics curves for negative remote on/off logic figure 4: turn - on transient at zero load current) ( 2 0 ms/div). top trace: vout; 5 v/div; bottom trace: on/off input: 5 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: 5 v/div. for input vo ltage start up figure 6: turn - on transient at zero load current ( 10 0 ms/div). top trace: vout; 5 v/div; bottom trace: input voltage : 30 v/div. figure 7 : turn - on transient at full rated load current ( 10 0 ms/div). top trace: vout; 5 v/div; bottom trace: input voltage : 30 v/div.
datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 7 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 , vin=48v ). load cap: 30 0 f, e lectrolytic capacitor ; 10f, tantalum capacitor and 1 f ceramic capacitor. top trace: vout (200mv/div, 200us/div); bottom trace: io ( 1 0 a/div, 200us/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 : output voltage response to step - change in load current (50% - 75% of io, max; di/dt = 0.1a/s , vin=48v ). load cap: 30 0 f, e lectrolytic capacitor ; 10f, tantalum capacitor and 1f ceramic capacitor. top trace: vout (200mv/div, 200us/div) ; bottom trace: io ( 1 0 a/div, 200us/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.. fig ure 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 bat tery impedance. measure current as shown above. figure 11: input terminal ripple current, i c , at full rated output current and nominal input voltage w ith 12h source impedance and 100 f electrolytic capacitor ( 1 a/div 2us/div ).
datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 8 electrical character istics curves figure 12: input reflected ripple current, i s , through a 12h source inductor at nominal input voltage and rated load current (2 0m a/div 2us /div ). figure 13: output voltage noise and ripple measurement test setup. figure 14: output voltage ripple at nominal input voltage and rated load current (io= 25 a) ( 5 0 mv/div , 2us/div ) loadcapacitance: 30 0uf(electrolytic)+10uf(tantalum)+1uf(ce ramic) and min co . bandwidth: 20 mhz. figure 15: output voltage vs. load curren t showing typical current limit curves and converter shutdown points. 10 10.5 11 11.5 12 12.5 13 0 5 10 15 20 25 30 35 output current(a) output voltage(v) without droop with droop
datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 9 design consideration s inp ut 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 100f electrolytic capacitor (esr < 0.2 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 applicati ons. 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 a nd tested result which can meet class b in cisspr 22. schematic : te st result: 25c, 48vin, full load, green line is average peak mode and blue line is quasi 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, csa c22.2 no. 60950 - 1 2nd, iec 60950 - 1 2nd : 2005,en 60950 - 1 2nd: 2006+a11+a1: 2010, if the system in which the power module is to be used must meet safety agen cy requirements. when the input source is selv , 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 operator accessible. ? one vout pin is grounded. ? a selv reliability te st is conducted on the system where the module is used , in combination with the module, to ensure hazardous voltage does 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 power module has extra - low voltage (elv) outputs when all inputs are elv. this power module is not internally fused. to achieve optimum safe ty and system protection, an input line fuse is highly recommended. the safety agencies require a normal - blow fuse with 3 0 a maximum rating to be installed in the ungrounded lead. a lower rated fuse can be used based on the maximum inrush transient energy a nd 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 po wer 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, plea se contact deltas technical support team. 1 mhz 10 mhz 150 khz 30 mhz 10.0 20.0 30.0 40.0 50.0 60.0 70.0 0.0 80.0 dbv limits 55022mqp 55022mav transducer 8130 traces pk+ av
datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 10 output overvoltage protection the module can detect and respond to output overvoltage conditions. if the overvoltage condition causes the output voltage to rise above the limit in the specifications table, the m odule will shut down. the modules will try to restart after shutdown . if fault condition still exists, the modules will shut down again. this restart trial will continue until the fault condition is corrected. the vo ovp function could be changed via pm bus. the command related to vo ovp function are vout_ov_warn_limit, vout_ov_fault_limit and vout_ov_ fault _response. input over voltage lockout the module can detect and respond to input overvoltage conditions. if the input vol tage rise s above the limit in the specifications table, the module will shut down. the module is factory default configured for auto - restart operation. the auto - restart f eature continually monitors the input voltage and will restart the module when the level fal ls 6v below the in p ut ovp level. the vin ovp function could be changed via pmbus. the command rel ated to vin ovp function are vin_ov_fault_limit and vin_ov_fault_response remote on/off (enable) the remote on/off (enable) feature on the module is negative logic. the low l ogic turns the modules on. and the high logic, or floating, turns the modules off. remote on/off (enable) can be controlled by an external switch between the on/off terminal and the v i n( - ) terminal. the switch can be an open collector or open drain. f eatures descriptions over - power protection the modules include an internal output over - power protection circuit, which will endure power limiting for an unlimited duration during output overload. if the output current exceeds the ocp set points, the modu les will automatically shut down (hiccup mode). the modules will try to restart after shutdown. if the overload condition still exists, the modules will shut down again. this restart trial will continue until the overload condition is corrected. the ocp function could be changed via pmbus. the command related to ocp function are iout_oc_warn_limit, iout_oc_fault_limit and iout_oc_ fault _response. 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 modules will shut down, and enter the auto - restart mode. for auto - restart mode, the module will monitor the module temperature after shutdown. once the temperature of mo dule is decreased by an otp hysteresis, the module will restart. the otp function could be changed via pmbus. the command related to otp function are ot _warn_limit, ot_fault_limit and ot_fault _response. input under voltage lockout when vin exceeds vin turn on threshold, the module output is enabled, when vin falls below vin turn off threshold, the module output is disabled. vin turn on threshold and vin turn off threshold can be reconfigured via the pmbus interface. the vin uvp function could be chan ged via pmbus. the command related to vin uvp function are vin_on and vin_off.
datasheet e - mail : dcdc@deltaww.com ds_ q48sc120 25 _ 0 4062017 http://www.deltaww.com/dcdc p 11 for the negative logic , i f the remote on/off (enable) feature is not used, please maintain the enable pin to vin ( - ). figure 16: remote on/off (enable) implementation secondary remote on/off reference to the vo( - ) terminal, there is a c2 pin. the default configuration is set t o pgood function. and such pin can be reconfigured as secondary remote on/off pin by the pmbus interface including 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. the secondary remote on/off can be controlled by an external switch between the on/off terminal and the vo( - ) terminal. the switch can be an open collector or open drain. mfr_c1_c2_ara_config, mfr_ c2_logic, mfr_pgood_polarity are used to config c2 pin function. remote sense remote sense minimizes the effects of distribution losses by regulating the voltage at the remote - sense connections (see figure 1 7 ). the sense( - ) pin should be always c onnected to vo( - ) pin . the voltage between the remote - sense pins and the output terminals must not exceed the output voltage sense range given in the feature specifications [vo(+) C vo( C )] C sense(+) 0.5 v the output voltage can also be increased by th e trim, the maximum increase for the output voltage is the sum of both. the amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. when using remote sense and trim, the output voltage of the module can be increased, which at the same output current, would increase the power output of the module. care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power (maximum rated power = vo,s et x io,max) figure 17: circuit configuration for remote sense. configurable control pins the module contains one configurable control pins c2, referenced to the module secondary sig_g nd. see mechanical views for pin locations. the following table list the default factory configurations for the functions assigned to the pin. pin designation/function configuration c2 power good note4 factory default on/off note5 optional vias pmbus note4: power good is a full - drive output, pull up to 3.3v internally , note5: on/off is an open - dr ai n input output voltage adjustment (trim) note1 to increase or decrease the output vol tage set point, connect 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. figure 1 8 : circuit configuration for trim - down (decrease output voltage) if the external resistor is connected between the trim and vo ( - ) pins, the output v oltage set point decreases (fig. 1 8). the external resistor value required to obtain a percentage of output voltage change % is defined as: ex. when trim - down - 10% (1 2 v0.9=10. 8 v) r load vin+ enable vin - vo+ vo - r load vin+ enable vin - vo+ vo - vout ( + ) load input source vin ( - ) s ense ( - ) s ense ( + ) vout ( - ) vin ( + ) r esist ance of trace r esist ance of trace ? ? ? ? ? ? ? ? ? ? ? ? k down rtrim 2 . 10 511 _ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? k k down rtrim 9 . 40 2 . 10 10 511 _
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 12 figure 19 : circuit configuration for trim - up (increase output voltage) i f the external resistor is connected between the trim and vo ( + ) the output voltage set point increases (fig.19) the extern al resistor value require d to obtain a per centage output voltage change % is defined as: ex. when trim - up +10% (1 2 v1.1=1 3.2 v) care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power. note1: see the last page. power good, pg the module provide s a power good (pg) signal which is provided by the ic inside module, voltage level 3.3v, to indicate that the output voltage is within the normal output voltage range of the power module. the pg signal will be de - asserte d to a low state if any condition such as overtemperature, overcurrent or loss of regulation occurs that would result in the output voltage going below the normal voltage range value. the v out pg function could be changed via pmbus. the command related to v out pg function are power_good_on and power_good_off. parallel and droop current sharing the modules are capable of operating in parallel, and realizing current sharing by droop current sharing method. there is about 4 00mv output voltage droop from 0a to full output load, and there is no current sharing pin. by connectting the vin pin and the vo pin of the parallel module together, the current sharing can be realized automatically. figure 20 : parallel and droop current sharing configuration f or no redundancy requirement system if system has no redundancy requirement, the module can be parallel directly for higher power without adding external oring - fet; whereas, if the redundancy function is required, the external oring - fet should be added. for a normal parallel operation the following precautions must be observed: 1. the current sharing accuracy equation is: x% = | io C ( itotal / n ) | / irated, where, io is the output current of per module; itotal is the total load current; n is parallel module numbers; irated is the rated full load current of per module. 2. to ensure a better steady current sharing accuracy, below design guideline should be followed: a) the inputs of the converters must be connected to the same voltage source; and the pc b trace resistance from input voltage source to vin+ and vin - of each converter should be equalized as much as possible. b) the pcb trace resistance from each converters output to the load should be equalized as much as possible. c) for accurate current s haring accuracy test, the module should be soldered in order to avoid the unbalance of the touch resistance between the modules to the test board. 3. to ensure the parallel module can start up monotonically without trigging the ocp circuit, below design guideline should be followed: a) before all the parallel module finished start up, the total load current should be lower than the rated current of 1 module. b) the on/off pin of the converters should be connected together to keep the parallel modules star t up at the same time. c) the under voltage lockout point will slightly vary from unit to unit. the dv/dt of the rising edge of the input source voltage must be greater than 1v/ms to ensure that the parallel module start up at the same time. ? ? ? ? ? ? ? ? ? ? k up rtrim 2 . 10 511 1.225 ) (100 vo 11 . 5 _ ? ? ? ? ? ? ? ? ? ? ? k up rtrim 3 . 89 4 2 . 10 10 511 10 225 . 1 ) 10 100 ( 2 1 11 . 5 _ vin+ vin - vin+ vin - on/off vo+ vo - module i on/off vo+ vo - module ii vin load vin+ vin - vin+ vin - on/off vo+ vo - module i on/off vo+ vo - module ii vin load
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 13 thermal c onsiderations 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 deltas dc/dc power modules are characterized in heated vertical wind tunnels that simulate the the rmal environments encountered in most electronics equipment. this type of equipment commonly uses vertical ly 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 185mmx185mm,70m (2oz),6 layers 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 21 : 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 ope rating 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_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 14 thermal curves (without heat spread er) figure 22 : * hot spot 1& ntc res istor temperature measured points. the allowed maximum hot spot 1 temperature is defined at 11 2 figure 23 : output current vs. ambient temperature and air velocity @vin=48v(transverse orientation , airflow from vin+ to vin - ,without heat spreader ) thermal curves (with heat spreader) figure 24 : * hot spot 2 temperature measured point. the allowed maximum hot spot 2 temperatur e is defined at 10 2 figure 25 : output current vs. ambient temperature and air velocity @vin=48v(transverse orientation , airflow from vin+ to vin - ,with heat spreader ) airflow hot spot 1 ntc resistor 0 5 10 15 20 25 25 30 35 40 45 50 55 60 65 70 75 80 85 output current (a) ambient temperature ( ) q48sc12025(standard) output current vs. ambient temperature and air velocity @vin = 48v (transverse orientation) 300lfm 200lfm 400lfm natural convection 100lfm 500lfm 600lfm 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 ( ) q48sc12025(standard) output current vs. ambient temperature and air velocity @vin = 48v (transverse orientation, with heat spreader ) 300lfm 200lfm 400lfm natural convection 100lfm 500lfm 600lfm
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 15 the module contains a data flash used to store configuration settings, which will not be programmed into the device data flash automatically. the store_default_all command must be used to commit the current settings are transfer from ram to data flash a s device defaults. pmbus addressing the module has flexible pmbus addressing capability. when connect different resistor from addr0 and addr1 pin to gnd pin, 64 possible addresses can be acquired. the address is in the form of octal digits; each pin offe r one octal digit, and then combine together to form the decimal address as shown in below. address = 8 * addr1 + addr0 corresponded to each octal digit, the requested resistor values are shown in below, and +/ - 1 % resistors accuracy can be accepted. i f there is any resistances exceeding the requested range, address 127 will be return. 0 - 12 and 40, 44, 45, and 55 in decimal address cant be used, since they are reserved according to the smbus specifications, and which will also return address 127. digital feature desc riptions the module has a digital pmbus interface to allow the module to be monitored, controlled and configured by th e system. the module supports 4 pmbus signal lines, data, c loc k, smbalert (optional), control (c2 pin, optional), and 2 address line addr0 and addr1. more detail pmbus information can be found in the pmb power management protocol specification, part i and part ii, revision 1.2 ; which is shown in http://pmbus.org . both 100khz an d 400khz bus speeds are supported by the module. connection for the pmbus interface should be following the high power dc specifications given in section 3.1.3 in the smbus specification v2.0 or the low power dc specifications in section 3.1.2. the complet e smbus specification is shown in http://smbus.org . t he module support s t he packet error checking (pec) protocol. it can check the pec byte provided by the pmbus master, and include a pec byte in all message responses to the master. and the module also can communicate with the master that does not implement the pec mechanism. smbalert protocol is also supported by the module. smbalert line is also a wired - and signal; by which the module can alert the pmbus master via pull ing the smbalert pin to an active low. there are only one way that the master and the module response to the alert of smbalert line. this way is for the module used in a system that does not support alert response address (ara). the module is to retain it s resistor programmed address, when it is in an alert active condition. the master will communicate with the slave module using the programmed address, and using the various read_status commands to find who cause for the smbalert. the clear_faults command will clear the smbalert.
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 16 o ctal digit resistor( kohm ) 0 10 1 15.4 2 23.7 3 36.5 4 54.9 5 84.5 6 130 7 200 pmbus data format the module receives and report date in linear format. the exponent of the data words is fixed at a reasonable value for the command; altering the exponent is not supported. direct format is not supported by the module. for commands that set or report any voltage thresholds related to the output voltage, the module supports the linear data format consisting of a two byt e value with a 16 - bit, unsigned mantissa, and a fixed exponent of - 12. the format of the two data bytes is shown below: the equation can be written as: vout = mantissa x 2 ( - 12) for example, considering set vout to 12v by vout_command, the read/write data can be calculated refer to below process: mantissa =vout/ 2 ( - 12) = 12 / 2 ( - 12) =4 9152 ; converter the calculated mantissa to hexa decimal 0x c000 . for commands that set or report all other thresholds, including input voltages, output current, temperatu re, time and frequency, the supported linear data format is a two byte value with: an 11 bit, twos complement mantissa , and a 5 bit, twos complement exponent (scaling factor).the format of the two data bytes is shown as in below. the equation can be written as: value = mantissa x 2 (exponent) for example, considering set the turn on threshold of input under voltage lockout to 34v by vin_on command; the read/write data can be calculated refer to below process: get the exponent of vin , - 3; whose binary is 11101 mantissa =v in /2 ( - 3 ) = 34/ 2 ( - 3 ) =272; converter the calculated mantissa to hexadecimal 110, then converter to binary 00100010000;combine the exponent and the mantissa, 11101 and 001000 10000; converter binary 1110100100010000 to hex adecimal e910.
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 17 supported p mbus commands the main pmbus commands described in the pmbus 2.0 specification are supported by the module. partial pmbus commands are fully supported; partial pmbus commands have difference with the definition in pmbus 2.0 specification. all the supported pmbus comm ands are detail summarized in below table command command code c o mmand description transf - er type compatible with standard pmbus or not? data format default value range limit data units expon - ent note operation 0x01 turn the module on or off by pmbus command r/w byte refer to below description; bit field 0x80 / / / / on_off_config 0x02 configures the combination of primary on/off pin and pmbus command r/w byte not support turn off delay and fall time setup bit field 0x1d / / / 0x1d (neg logi c); 0x1f (pos logic); clear_faults 0x03 clear any fault bits that have been set send byte yes / / / / / / store_default_all 0x11 stores operating parameters from ram to data flash send byte yes / / / / / this command is effective to the parameter of all command in this table. restore_default_all 0x12 restores operating parameters from data flash to ram send byte yes / / / / / this command can't be issued when the power unit is running. vout_mode 0x20 read vo data format read byte yes mode+exp 0x14 / / / / vout_command 0x21 set the output voltage normal value r/w word yes vout linear 12 8 ~13. 2 volts - 12 default value =12.4v is for droop function (current sharing), value =12v is for no droop function vout_ margin_high 0x2 5 set the output voltage margin h igh value r/w word yes vout linear 12.6 10.2 ~13 volts - 12 default value = 13.02 v is for droop function (current sharing), value =12 .6 v is for no droop function vout_ margin_low 0x2 6 set the output voltage margin low value r/w word yes vout linear 11.4 10.2 ~ 13 volts - 12 default value = 11.78 v is for droop function (current sharing), value = 11.4 v is for no droop function frequency_switch 0x33 set the switching frequency r/w word yes frequency linear 130 120 ~ 180 khz - 2 write command need module off condition
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 18 command command code c o mmand description transf - er type compatible with standard pmbus or not? data format default value range limit data units expon - ent note vin_on 0x35 set the turn on voltage threshold of vin under voltage lockout r/w word yes vin l inear 3 5 33~ 36 v - 3 vin_on should be higher than vin_off vin_off 0x36 set the turn off voltage threshold of vin under voltage lockout r/w word yes vin linear 3 3 3 1 ~ 34 v - 3 vin_on should be higher than vin_off vout_ov_fault_l imit 0x40 set the output overv oltage fault threshold. r/w word yes vout linear 15 1 1 ~ 1 5. 9 v - 12 must be higher than the value of vout_command and vout_ov_warn_limit; vout_ov_fault_ response 0x41 instructs what action to take in response to an output overvoltage fault. read byte refer to below description; bit field 0xb8 / n/a / d efault hiccup mode vout_ov_warn_l imit 0x42 set a threshold causing an output voltage high warning. r/w word yes vout linear 1 4 11~1 5. 9 v - 12 must be the same or less than vout_ov_fault_limit value iout_oc_fau lt_li mit 0x46 set the output overcurrent fault threshold. r/w word yes iout linear 37 25 ~ 55 a - 4 must be greater than iout_oc_warn_limit value iout_oc_fault_r esponse 0x47 instructs what action to take in response to an output overcurrent fault. read byte refer to below description; bit field 0xf8 / n/a / d efault hiccup mode iout_oc_warn_li mit 0x4a set a threshold causing an output current high warning. r/w word yes iout linear 30 25 ~ 55 a - 4 must be less than iout_oc_fault_limit value ot_fault_limit 0x4f set the over temperature fault threshold. r/w word yes temp linear 125 25~ 1 3 5 deg. c - 2 must be greater than ot_warn_limit value ot_fault_respo nse 0x50 instructs what action to take in response to an over temperature fault. read byte refer to below descrip tion; bit field 0xb8 / n/a / 0xb8
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 19 command comman d code c o mmand description transf - er type compatible with standard pmbus or not? data format default value range limit data units expon - ent note ot_warn_ limit 0x51 set a threshold causing a temperatur e high warning. r/w word yes temp linear 100 25~1 3 5 deg.c - 2 must be less than ot_fault_li mit value vin_ov_fa ult_limit 0x55 set the input overvoltage fault threshold. r/w word yes vin linear 100 48~1 0 0 v - 3 / v in _ov_fa ult_respo nse 0x 56 instructs what act ion to take in response to an in put overvoltage fault. read byte refer to below description; bit field 0x f8 / n/a / d efault hiccup mode power_go od_on 0x5e sets the output voltage at which the bit 3 of status_word high byte should be asserted. r/w word yes vout linear 11 8 ~13 .2 v - 12 must be greater than power_goo d_off value power_go od_off 0x5f sets the output voltage at which the bit 3 of status_word high byte should be negated. r/w word yes vout linear 9 8 ~1 3 .2 v - 12 must be less than power_goo d_on va lue ton_delay 0x60 sets the time from a start condition is received until the output voltage starts to rise r/w word yes time linear 20 20 ~500 ms - 1 / ton_rise 0x61 sets the time from the output starts to rise until the voltage has entered the regulation band. r/w word yes time linear 3 0 15~500 ms - 1 / status_w ord 0x79 returns the information with a summary of the module's fault/warning read word refer to below description; bit field / / / / / status_vo ut 0x7a returns the information of the module's out put voltage related fault/warning r/w byte refer to below description; bit field / / / / / status_io ut 0x7b returns the information of the module's output current related fault/warning r/w byte refer to below description; bit field / / / / /
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 20 command c omman d code c o mmand description transf - er type compatible with standard pmbus or not? data format default value range limit data units expon - ent note status_in put 0x7c returns the information of the module's input over voltage and under voltage fault r/ w byte refer to below description; bit field / / / / / status_te mperatur e 0x7d returns the information of the module's temperature related fault/warning r/w byte refer to below description; bit field / / / / / status_cm l 0x7e returns the information of t he module's communication related faults. r/w byte refer to below description; bit field / / / / / read_vin 0x88 returns the input voltage of the module read word yes vin linear / / v - 3 / read_vou t 0x8b returns the output voltage of the module read word yes vout linear / / v - 12 / read_iout 0x8c returns the output current of the module read word yes iout linear / / a - 4 / read_tem perature_ 1 0x8d returns the module's hot spot temperature of the module read word yes temp linear / / deg.c - 2 / pmbus_re vi sion 0x98 reads the revision of the pmbus read byte yes bit field 0 x 4 2 / / / / mfr_c1_c2 _ara_conf ig 0xe0 config c2 pin function r/w byte refer to below description; bit field 0x00 / / / / mfr_ c2_ configure 0xe1 config c2 pin logic r/w byte refer to belo w description; bit field 0x00 / / / / mfr_pgoo d _polarity 0xe2 config power good logic r/w byte refer to below description; bit field 0x01 / / / d efault positive pgood logic mfr_seria l 0x9e reads the sn of module read block / total 11 ascii charact ers xxxxxxxxx xx / / / the sn number of module use 11 ascii characters
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 21 operation [0x01] bit number purpose bit v alue meaning default settings 0x80 7: enable/disable the module 1 output is enabled 1 0 output is disabled 6: reserved 0 5:4 marg ins 00 no margin 00 01 margin low (act on fault) 10 margin high (act on fault) 3:0 reserved 0000 vout_ov_fault_response [0x41] bit number purpose bit v alue meaning default settings 0xb8 7:6 response setting s 10 u nit shuts down and responds acc ording to the retry settings 10 5:3 retry setting 111 unit continuously restarts while fault is present until commanded off 111 000 unit does not attempt to restart on fault 2:0 delay time setting 000 no delay supported 000 iout_oc_fault_response [0x47] bit number purpose bit v alue meaning default settings 0xf8 7:6 response setting s 1 1 u nit shuts down and responds according to the retry settings 11, 5:3 retry settings 111 unit continuously restarts while fault is present until commanded off 111 000 unit does not attempt to restart on fault 2:0 delay time setting 000 no delay supported 000 ot_fault_response [0x50] bit number purpose bit v alue meaning default settings 0x b 8 7:6 response setting s 1 0 u nit shuts down and responds according to the retry settings 10, 5:3 retry settings 111 unit continuou sly restarts while fault is present until commanded off 111 000 unit does not attempt to restart on fault 2:0 delay time setting 000 no delay supported 000
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 22 v in _ov_fault_response [0x 56 ] bit number purpose bit v alue meaning default settings , 0 xf8 7: 6 response setting s 1 1 u nit shuts down and responds according to the retry settings 11 5:3 retry setting 111 unit continuously restarts while fault is present until commanded off 111 000 unit does not attempt to restart on fault 2:0 delay time setti ng 000 no delay supported 000 status_word [0x79] high byte bit number purpose bit v alue meaning 7 an output over voltage fault or warning 1 occurred 0 no occurred 6 an output over current fault or warning 1 occurred 0 no occurred 5 an input volt age fault, including over voltage and undervoltage 1 occurred 0 no occurred 4 reserved 3 power_good 1 is negated 0 ok 2:0 reserved low byte bit number purpose bit v alue meaning 7 reserved 6 o ff (the unit is not providing pow er to the output, regardless of the reason) 1 occurred 0 no occurred 5 an output over voltage fault 1 occurred 0 no occurred 4 an output over current fault 1 occurred 0 no occurred 3 an input under voltage fault 1 occurred 0 no occurred 2 a temperature fault or warning 1 occurred 0 no occurred 1 cml ( a communications, memory or logic fault 1 occurred 0 no occurred 0 reserved
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 23 status_vout [0x7a] bit number purpose bit v alue meaning 7 output o ver voltage fault 1 occurred 0 no occurred 6 output o ver voltage warning 1 occurred 0 no occurred 5:0 reserved status_iout [0x 7b] bit number purpose bit v alue meaning 7 output o ver current fault 1 occurred 0 no occurred 6 reserved 5 output o ver current warning 1 occurred 0 no occurred 4:0 reserved status_input [0x7c] bit number purpose bit v alue meaning 7 inp ut o ver voltage fault 1 occurred 0 no occurred 6: 5 reserved 4 input under voltage fault 1 occurred 0 no occurred 3:0 reserved status_temperature [0x7d] bit number purpose bit v alue meaning 7 over temperature fault 1 occurred 0 no oc curred 6 over temperature warning 1 occurred 0 no occurred 5:0 reserved status_cml [0x7e] bit number purpose bit v alue meaning 7 invalid/unsupported command received 1 occurred 0 no occurred 6 invalid/unsupported dat a received 1 occurred 0 no occurred 5 packet error check failed 1 occurred 0 no occurred 4:0 reserved
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 24 mfr_c1_c2_ara_config [0xe0] bit number purpose bit v alue meaning 7:5 reserved 000 reserved 4 ara 0 ara not functional, module remains at resistor programmed add ress when smblaert is asserted 3:0 pin configuration 0000 c2 pin: power_good 0010 c2 pin: on/off (secondary) mfr_ c2_configure [0xe1] bit number purpose bit v alue meaning 7:2 reserved 000000 reserved 1 on/off configuration 0 secondary side on/off pin state when mapped to c2 is ignored 1 and C primary and secondary side on/off 0 secondary side on/off logic 0 negative logic (low enable: input < 0.8v wrt vout( - ) 1 positive logic (high enable: input > 2.0v wrt vout( - ) mfr_pgood_polarity [0xe2 ] bit number purpose bit v alue meaning 7:1 reserved 0000000 reserved 0 power good logic 0 negative pgood logic 1 positive pgood logic
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 25 mechanical drawing ( with heat - spreader) * for modules with through - hole pins and the option al heat spreader, they are intended for wave soldering assembly onto system boards, please do not subject such modules through reflow temperature profile.
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 26 mechanical drawing ( without heat - spreader) pin specification: pins 1 - 4 , 6 - 8 1.00mm (0.040) di ameter (all pins are copper with matte tin plating over nickel under plating ) pins 5 , 9 2. 1.50 mm (0.0 59 ) diameter (all pins are copper with matte tin plating over nickel under plating ) pins 10 - 1 6 1. sq 0.50mm(0.020) ( all pins are copper with gold fla sh plating)
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 27 recommended layout part numbering syste m q 48 s c 120 25 n r d h type of product input voltage number of outputs product series output voltage output current on/off logic pin length /type pin assignment option code q - quarter brick 48 - 36~75v s - single c - series number 120 - 12v 25 - 25 a p - positive n - negative r - 0.170 n - 0.145 k - 0.1 10 d - digital pins a - analog pins i - ibc pins t - trim pins s - special pins trim pin current sharing heat spread er case pin c yes n o no no d no droop no no e no no no no h yes no yes no i no droop yes no j no no yes no r yes no yes yes s no droop yes yes t no no yes yes note f or mechanical p ins option: 1. d - digital pins*: with digital pins & sense pins & trim pin 2. a - analog pins*: with sense pins & trim pin, without digital pins 3. i - ibc pins*: without digital pins & sense pins & trim pin 4. t - trim pins: with tri m and digital pins, without sense pins 5. s - special pins: with trim pin, without digital & sense pins
ds_ q48sc120 25 _ 0331 201 7 e - mail : dcdc@deltaww.com http://www.deltaww.com/dcdc p 28 model list model name input output eff @ 100%load q48sc120 25 n rd h 36 v~ 75 v 1 1 a 12 v 25 a 9 5. 1 % q48sc120 25 n r ah 36 v~ 75 v 1 1 a 12 v 25 a 9 5. 1 % q48sc120 2 5 n rd r 36 v~ 75 v 1 1 a 12 v 25 a 9 5. 1 % q48sc120 25 n nd h 36 v~ 75 v 1 1 a 12 v 25 a 9 5. 1 % * for modules with through - hole pi ns and the optional heat sink , they are intended for wave soldering assembly onto system boards; please do not subject such modules through reflo w temperature profile. note 3 : if use vout_command of pmbus to trim vo ut set point, then the function of trim pin( 7 pin) will be disable d immediately . and if need enable the function of trim pin(7 pin) to trim vo ut set point again , should turn off and turn on the input voltage of module to restart module . contact: www.deltaww.com/dcdc email: dcdc@deltaww.com usa: telephone: east coast: 978 - 656 - 3993 west coast: 510 - 668 - 5100 fax: (978) 656 3964 europe: phone: +31 (0)20 655 09 67 fax: +31 (0)20 655 09 99 asia & the rest of world: telephone: +886 3 4526107 ext 6220~6224 fax: +886 3 4513485 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. i nformation 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 othe r 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 .

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