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d atasheet ds_ q48 s g 12 0 42 _0 8062013 features ? high ef ficiency: 9 5.3 % @ 11.8 v/ 42 a ? size : 58.4 x 36.8 x 1 2.7 mm (2.30 x1.45 x 0. 50 ) ? pmbus rev.1. 2 compliance ? industry standard, dosa compliant pin out ? c an be connected in parallel directly ? parallel and droop current sharing ? fixed frequency operation ? input uvlo , output ocp & ovp, otp ? monotonic startup into nor mal and pre - biased loads ? 2250v isolation and b asic insulation ? no minimum load required ? iso 900 1 , tl 9000, iso 14001 , qs 9000, ohsas 18001 certified manufacturing facility ? ul/cul 60950 - 1 (u s & canada ) to be recognized applications ? telecom / datacom ? wireless networks ? optical network equipment ? server and data storage ? industrial/test equipment options ? d igital pmbus interface ? paral lel and droop current sharing ? trim ? positive on/off logic ? short pin lengths available delphi series q48s g quarter brick family full digital control dc/dc power modules: 4 8v in, 1 1.8 v/ 42 a out the delphi series q48s g , 3 8 ~75v input, isolated single outpu t , quarter brick, are full digital control dc/dc converters, and are the latest offering from a world leader in power systems technology and manufacturing D delta electronics, inc. the q48s g series provide up to 5 00 watts of power in an industry standard, dosa compliant footprint and pin out; the typical e fficiency is 9 5.3 % at 48v input, 11.8 v output and 42 a load. there is a built - in digital pwm controller in the q48s g series, which is used to complete the vo feedback, pwm signal gen eration, droop current s haring, fault protection, and pwbus communications, and so on. with the digital control , many design and application flex ibility, advanced performance, and reliability are obtained; and the q48s g series can be connected in parallel directly for higher powe r without add external oring - fet.
ds_ q48s g 120 42 _0 8062013 2 technical specificat ions ( t a =25c, airflow rate=300 lfm, v in =48vdc, nominal vout unless otherwise noted.) parameter notes and conditions q48s g 120 42 (standard) min. typ. max. units absolute maximum ratings i nput voltage continuous 80 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 operating ambient temperature - 40 85 c storage tempe rature - 55 125 c input/output isolation voltage 2250 vdc input characteristics operating input voltage 3 8 75 vdc input under - voltage lockout turn - on voltage threshold 3 2.5 34 35 .5 vdc turn - off voltage threshold 3 0.5 32 3 3.5 vdc l ockout hysteresis voltage 1 2 3 vdc maximum input current vin = 3 8 v, 100% load , 1 3.75 1 4 a no - load input current 75 1 1 0 ma off converter input current 18 23 ma inrush current(i 2 t) with 100uf external input capacitor 1 a 2 s start up current peak, vin = 36v, 100% load , with 5 0 00uf co 1 5 22.5 a input terminal ripple current rms, with 100uf input cap. 0. 32 0. 48 a input reflected - ripple current p - p thru 12h inductor, 5hz to 20mhz 10 ma input voltage ripple rejection 120 hz 5 0 db output charact eristics the module w ithout droop current sharing option code output voltage set point vin=48v, io=io.max, tc=25c 11. 7 5 11.8 1 1 . 8 5 vdc output voltage regulation over load io=io,min to io,max 20 6 0 mv over line vin=3 8 v to 75v 20 50 mv over temperature tc= - 40c to 125 c 12 0 mv total output voltage range over sample load, and temperature , from 3 8 ~75v vin 11. 6 11.8 12. 0 v the module w ith droop current sharing option code output voltage set point vin=48v, io=0a, tc=25c 1 2 . 25 1 2 . 3 12. 3 5 vdc output voltage regulation over load io=io,min to io,max 500 600 mv over line vin=3 8 v to 75v 20 50 mv over temperature tc= - 40c to 125 c 12 0 mv total output voltage range over sample load, and temperature , from 3 8 ~75v vin 11. 5 1 2. 3 12. 5 v both with and without droop current sharing option code output voltage ripple and noise 5hz to 20mhz bandwidth peak - to - peak full load, 1f ceramic, 10f tantalum 150 2 5 0 mv rms full load, 1f ceramic, 10f tantalum 6 0 10 0 mv oper ating output current range full input voltage range 0 42 a output dc current - limit inception output voltage 10% low 110 1 50 % output voltage trim range vin=48v - 20 10 % dynamic characteristics output voltage current transient 48v, 1 0f tan & 1 f ceramic load cap, 0.1 a/s positive step change in output current 50% io.max to 75% io.max 200 400 mv negative step change in output current 75% io.max to 50% io.max 200 400 mv setting time (within 1% vout nominal) 3 00 s turn - on transient start - up time, from on/off control 100 120 ms start - up time, from input 110 130 ms output capacitance 220 16000 f efficiency 100% load vin=48v 9 4 . 5 9 5 . 3 % 60% load vin=48v 95 .5 9 6 .3 % isolation characteristics input to output 2250 vdc isolation resistance 10 m isolation capacitance 1500 pf feature characteristics current sharing accuracy 10 % switching frequency 1 3 0 khz on/off control logic low von/off - 0.7 0.8 v logic high von/off 2.4 50 v on/off current (for both remote on/off logic) ion/off at von/off=0.0v 0.5 ma on/off current (for both remote on/off logic) ion/off at von/off= 2 . 4 v 10 a leakage current (for both remote on/off logic) logic high, von/off=1 5 v 50 a output voltage trim range vin=48v, pout Q max rated power - 20 1 0 % output over - voltage protection over full temp range; % of nominal vout 14 1 7 v
ds_ q48s g 120 42 _0 8062013 3 technical specificat ions ( t a =25c, airflow rate=300 lfm, v in =48vdc, nominal vout unless otherwise noted.) parameter notes and conditions q48s g 120 42 (standard ) min. typ. max. units pmbus signal interface characteristics logic input low (v il ) c2, data, smbalert, clock pin 0 0.8 v logic input high (v ih ) c2, data, smbalert, clock pin 2.1 3.3 v logic onput low (v ol ) c2, data, smbalert, clo ck pin; i ol =6ma 0.4 v logic onput high (v oh ) c2, data, smbalert, clock pin; i oh = - 6ma 2.6 v pmbus operating frequency range 100 400 khz pmb us monitoring characteristics output current reading accuracy io= 50% ~ 100% of io, max; - 5 +5 % io= 5 % ~ 5 0% of io, max; - 2 +2 a output voltage reading accuracy - 2 +2 % input voltage reading accuracy - 4 +4 % temperature reading accuracy - 5 +5 general specifications mtbf io= 8 0% of io, max; 300lfm; ta=25 c 2.8 m hours weight 66.5 gr ams over - temperature shutdown ( with heat spreader) refer to figure 2 2 for hot spot 2 location (48vin,80% io , 200lfm,airflow from vin+ to vin - ) 1 15 c over - temperature shutdown ( with 0.5 heat s ink ) refer to figure 2 4 for hot spot 3 location (48vi n,80% io , 200lfm,airflow from vin+ to vin - ) 112 c over - temperature shutdown ( ntc resistor ) 125 c n ote: please attach thermocouple on ntc resistor to test otp function, the hot spots temperature is just for reference. pin defination pin# name function pin# name function 1 vin(+) 7 c2 secondary on/off control pin; the default configuration is set to ignore this input. and such pin can be reconfigured by the pmbus interface. 2 on/off primary on/off control pin 8 sig_gnd signal ground 3 vin( - ) 9 data pmbus data line 4 vout( - ) 10 smbalert pmbus smbalert line 5 trim trim pin 11 clock pmbus clock line 6 vout(+) 1 2 addr1 addr1 pin sets the high order digit of the address. 13 addr0 addr0 pin sets the low order digit of the address. simplified applicati on circuit vout (+) trim addr0 addr1 vout ( - ) vin (+) vin ( - ) on/off delta dc/dc module emi filter reverse polarity protection fuse load input source system mcu clock data c2 smb - alert clk data ctrl alert on/off control vout (+) trim addr0 addr1 vout ( - ) vin (+) vin ( - ) on/off delta dc/dc module emi filter reverse polarity protection fuse load input source system mcu clock data c2 smb - alert clk data ctrl alert on/off control
ds_ q48s g 120 42 _0 8062013 4 electrical character istics curves figure 1: efficiency vs. load current for minimum, nominal, and maximum input voltage at 25c figure 2: power dissipation vs. load current for minimum, nominal, and maximum input voltage at 25c figure 3: typical full load input characteristics at room temperature figure 4: output voltage regulation v s load current showing typical current limit curves and converter shutdown points for nominal input voltage at room temperature 0 2 4 6 8 10 12 14 16 30 34 38 42 46 50 54 58 62 66 70 74 input voltage (v) input current (a)
ds_ q48s g 120 42 _0 8062013 5 electrical character istics curves for negative remote on/off logic figure 5 : turn - on transient at zero load current ( 10 ms/div). vin= 48v . top trace: vout , 5 v/div; bottom trace: on/off input , 2 v/div figure 6 : turn - on transient at full rated load current (constant current load) ( 10 ms/div). vi n=48v . top trace: vout , 5 v/div; bottom trace: on/ off input , 2 v/div for input voltage start up figure 7 : turn - on transient at zero load current ( 10 ms/div). vin=48v . top trace: vout , 5 v/div , bottom trace: input voltage , 3 0v/div figure 8 : turn - on t ransient at full rated load current (constant current load) ( 10 ms/div). vin=48v . top trace: vout , 5 v/div; bottom trace: input voltage , 3 0v/div
ds_ q48s g 120 42 _0 8062013 6 electrical character istics curves figure 9 : output voltage response to step - change in load cu rrent (75% - 50% of io, max; di/dt = 0.1a/s , vin=48v ). load cap: 10f, tantalum capacitor and 1f ceramic capacitor. top trace: vout ( 20 0 mv/div, 2 00us /div ) ; bottom trace: io (1 5 a/div, 200us/div). scope measurement should be made using a bnc cable (length sh orter than 20 inches). position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module.. figure 10 : output voltage response to step - change in load current (50% - 75% of io, max; di/dt = 0.1a/s , vin=48v ). load cap: 10f, tantalum capacitor and 1f ceramic capacitor. top trace: vout ( 20 0 mv/div, 2 00us /div ) ; bottom trace: io (1 5 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) fr om the module.. figure 11: 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 below figure 1 2 : input terminal ripple current, i c , at full rated output current and nominal input voltage with 12h source impedance a nd 100 f electrolytic capacitor ( 1 00 ma/d iv , 2us /div ). vin + vin - is ic 100uf, esr=0.2 ohm @ 25 o c 100khz cs: 220uf + + vin + vin - is ic 100uf, esr=0.2 ohm @ 25 o c 100khz cs: 220uf + + is ic 100uf, esr=0.2 ohm @ 25 o c 100khz cs: 220uf + + + +
ds_ q48s g 120 42 _0 8062013 7 electrical character istics curves figure 1 3 : input reflected ripple current, i s , through a 12h source inductor at nominal input voltage and rated load current ( 2 0 ma/div , 5 us /div ). figure 1 4 : output voltage noise and ripple measurement test setup figure 1 5 : output voltage ripple at nominal input voltage and rated load current ( 5 0 mv/div, 2us /div ) load capacitance: 1f ceramic capacitor and 10f tantalum capacitor. bandwidth: 20 mhz. scope measurements should be made using a bnc cable (length shorter than 20 inches). position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module. vo(-) vo(+) 10u 1u copper stri p scope resistive load
ds_ q48s g 120 42 _0 8062013 8 for parallel application c in is 100uf low esr aluminum cap x 3 pcs in parallel; cx 1 is 2.2uf ceramic cap 2pcs in parallel ; cx 2 is 2.2uf ceramic cap ; cy1 is 47nf ceramic cap x 2pcs in parallel; cy 2 is 47nf ceramic cap x 2pcs in parallel; cy is 3.3 nf ceramic cap ; l1 and l2 are common - mode inductor s , l1= l2= 0. 33 mh; test result : vin=48v, io= 8 2 a the blue line is qua si peak mode and the green one is average mode . design consideration s input source impedance the impedance of the input source connecting to the dc/dc power modules will interact with the modules and affect the stability. a low ac - impedance input source is recommended. if the source inductance is mor e than a few h, we advise adding a 100 to 200 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 deltas dc/dc power modules are designed to operate in a wid e variety of systems and applications. for design assistance with emc compliance and related pwb la yout issues, please contact deltas technical support team. an external input filter module is available for easier emc compliance design. below is the refer ence design for an input filter tested with q4 8s g 12 0 xx xx xx to meet class b in cisspr 22. schematic and components list for single module a pplication c in is 100uf *2pcs low esr aluminum cap; cx 1 is 2.2uf ceramic cap 2pcs in parallel ; cx 2 is 2.2uf ceramic c ap ; cy1 and cy2 are 47nf ceramic cap ; cy is 3.3 nf ceramic cap ; l1 and l2 are common - mode inductor s , l1= l2= 0. 47 mh; test result : vin=48v, io= 42 a 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 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
ds_ q48s g 120 42 _0 8062013 9 safety considerations the power module must be installed in complia nce 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 mee t 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 ad ditional 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 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 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 po wer 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 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 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 assistan ce on appropriate soldering and cleaning procedures, please contact deltas technical support team.
ds_ q48s g 120 42 _0 8062013 10 features description s over - current protection the modules include an internal output over - current protection circuit . if the output current exceeds the ocp set point, the modules wi ll shut down, and enter hiccup mode or latch mode . for hiccup mode, the module 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 cor rected. for latch mode, the module will shut down and not attempt to restart . the latch is reset by either cycling the input power or by toggling the primary on/off signal for one second. the ocp threshold and protection mode can be reconfigured by the pmb us interface; the default configuration is hiccup mode . over - voltage protection the modules include an internal output over - voltage protection circuit. if output voltage exceeds the over - voltage set point, the module will shut down, and enter in hiccup m ode or latch mode. for hiccup mode, the module will try to restart after shutdown. if the output over voltage condition still exists, the module will shut down again. this restart trial will continue until the over - voltage condition is corrected. for latch mode, the module will shut down and not attempt to restart . the latch is reset by either cycling the input power or by toggling the primary on/off signal for one second. the vo ovp threshold and protection mode can be reconfigured by the pmbus interface; the default configuration is hiccup mode . over - temperature protection the modules include an internal over - temperature protection circuit. if the module temperature exceeds the over - temperature threshold the module will shut down, and enter in auto - re co very mode or latch mode. for auto - re covery mode, the module will monitor the module temperature after shutdown. once the temperature is dropped and within the specification, the module will be auto - re covery . for latch mode, the module will shut down and no t attempt to restart . the latch is reset by either cycling the input power or by toggling the primary on/off signal for one second. the otp threshold and protection mode can be reconfigured by the pmbus interface; the default configuration is hiccup mode . primary remote on/off the primary 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 an d off during a logic low. the primary 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 drain. if the remote on/off feature is not used, f or negative logic , please short the on/off pin to vi( - ); for pos i tive logic , please leave the on/off pin floating . the module will not response to the remote on/off signal which is less than 120us. the primary remote on/off logic can be reconfigured by the pmbus interface . figure 1 7 : remote on/off implementation secondary remote on/off r eference to the v o ( - ) terminal , there is a c2 pin . the default configuration is set to ignore this input . and such pin can be reconfigured as secondary remote on/off pin by the pmbus i n terface 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 c ontrolled by an external switch between the on/off terminal and the vo( - ) terminal. the switch can be an open collector or open drain. parallel and droop current sharing the modules are capable of operating in parallel , and realizing current sharing by d roop current sharing method. there is about 500mv 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 automati cally. figure 1 8 : parallel and droop current sharing configuration for no redundancy requirement system r load vi( - ) vi(+) on/off vo( - ) vo(+) r load vi( - ) vi(+) on/off vo( - ) vo(+) vi( - ) vi(+) on/off vo( - ) vo(+) 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_ q48s g 120 42 _0 8062013 11 features description s (con.) if system has no redundancy requirement , the module can be parall el directly for higher power without add ing 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 acc uracy equation is: x% = | io C b) the pcb trace resistance from each converters pmbus communication 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 specificat ion, part i and part ii, revision 1.2 ; which is shown in http://pmbus.org . both 100khz and 400khz bus speeds are supported by the module. connection for the pmbus interface should be following the high power dc s pecifications given in section 3.1.3 in the smbus specification v2.0 or the low power dc specifications in section 3.1.2. the complete 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 includ e 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 mo dule can alert the pmbus master via pulling the smbalert pin to an active low. there are two ways that the master and the module response to the alert of smbalert line. one way is for the module used in a system that does not support alert response address (ara). the module is to retain its resistor programmed address, when it is in return to its resi ara and ask again now, who is holding the alert down. up and cant respo dummy command, for example read command on the pmbus addressing the module has flexible pmbus addressing capability. when connect different resistor from addr0 and addr1 pin to gnd pin, 64 possi ble addresses can be acquired. the address is in the form of octal digits; each pin offer one octal digit, and then combine together to form the decimal address as shown in below . address = 8 * ad dr1 + ad dr 0
ds_ q48s g 120 42 _0 8062013 12 features description s (con.) corresponded to each o ctal digit , the requested resistor values are shown in b elow , and +/ - 5 % resistors accuracy can be accepted. if there is a ny resistances exceeding the requested range, address 127 wil l be r e turn . 0 - 12 and 40, 44, 45, and 55 in decimal address cant be use d , since they are reserved according to the smbus specifications, and which will also return address 127. pmbus data format the module receives and report date in linear format. the exponent of the da ta 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 li near data format consisting of a two byte 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, c onsidering set vout to 12v by v out_command , the read/write data can be calculated refer to below process: 1. mantissa =vout/ 2 - 12 = 12 / 2 - 12 =4 9152 ; 2. converter the calculated mantissa to hexadecimal 0x c000 . for commands that set or report all other thresholds, includ ing input voltages, output current, temperature , time and frequency, the supported linear data format is a two byte value with: a n 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, c onsidering set the turn on thresho ld of input under voltage lockout to 34v by vin_on command; the read/write data can be calculated refer to below process: 1. get the exponent of vin, - 3; whose b inary is 11101 2. mantissa =v in /2 - 3 = 34/ 2 - 3 = 272; 3. converter the calculated mantissa to hexadecimal 110, then converter to b inary 00100010000; 4. combine the exponent and the mantissa, 11101 and 00100010000 ; 5. converter binary 1110100100010000 to hexadecimal e910. the detail exponent and resolution of main parameter is summarized as below: exponent resolution vin - 3 0.125v vo - 12 0.244mv io - 4 62.5ma temperature - 2 / switching requency - 2 0.25khz time - 1 0.5ms supported pmbus commands the main pmbus commands described in the pmbus 1.2 specification are supported by the module . partial pmbus command s are fully supported; partial pmbus commands have difference with the definition in pmbus 1.2 specification . all t he supported pmbus commands are detail summarized in below table .
ds_ q48s g 120 42 _0 8062013 13 features description s (con.) command comman d code c o mmand description transf - er type compatibl e 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 combina tion of prima ry on/off pin and pmbus command r/w byte refer to below description; bit field 0x1d (neg logic); 0x1f (pos logic); / / / / clear_faults 0x03 clear any fault bits that have been set send byte yes / / / / / / store_default_all 0x11 stores op erating parameters from ram to data flash send byte yes / / / / / this command is effective to the parameter of all command in the table. restore_default_all 0x12 restores operating parameters from data flash to ram send byte yes / / / / / this command c an't be issued when the power unit is running. vout_mode 0x20 to read vo data format read byte yes mode+ exp 0x14 / / / / vout_command 0x21 set the output voltage r/w word yes vout linear 11.8 9.6 ~13.2 volts - 12 / frequency_switch 0x33 set the switching frequency r/w word yes freque ncy linear 130 120 ~140 khz - 2 / vin_on 0x35 set the turn on voltage threshold of vin under voltage lockout r/w word yes vin linear 34 32~46 v - 3 vin_on should be higher than vin_off, and keep 2v hystersis. vin_off 0x36 set the turn off voltage threshold of vin under voltage lockout r/w word yes vin linear 32 32~46 v - 3 vin_on should be higher than vin_off, and keep 2v hystersis. vout_ov_fault_limit 0x40 set the output overvoltage fault threshold. r/w word yes vout linear 15 1 1 ~ 16 v - 12 must be higher than the value of vout_command and vout_ov_warn_limit;
ds_ q48s g 120 42 _0 8062013 14 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 vout_ov _fault_resp onse 0x41 instructs what action to take in response to an output overvoltage fault. r/w byte refer to below description; bit field 0xb8 / n/a / / vout_ov_warn_limit 0x42 set a threshold caus ing an output voltage high warning. r/w word yes vout linear 15 1 1 ~ 16 v - 12 must be less than vout_ov_fault_limit value iout_oc_fault_limit 0x46 set the output overcurrent fault threshold. r/w word yes iout linear 54 20~60 a - 4 must be greater than iout_oc_warn_limit value iout_oc_fault_respo nse 0x47 instru cts what action to take in response to an output overcurrent fault. r/w byte refer to below description; bit field 0xf8 / n/a / / iout_oc_warn_limit 0x4a set a threshold caus ing an output current high warning. r/w word yes iout linear 45 10~4 5 a - 4 must b e less than iout_oc_fault_limit value ot_fault_limit 0x4f set the over temperature fault threshold. r/w word yes temp linear 125 25~140 deg. c - 2 must be greater than ot_warn_limit value ot_fault_response 0x50 instructs what action to take in response to an over temperature fault. r/w byte refer to below description; bit field 0xb8 / n/a / / ot_warn_limit 0x51 set a threshold caus ing a temperature high warning. r/w word yes temp linear 115 25~125 deg. c - 2 must be less than ot_fault_limit value vin_ov_fau lt_limit 0x55 set the input overvoltage fault threshold. r/w word yes vin linear 110 48~110 v - 3 / power_good_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 8.1 ~13.2 v - 12 must be greater than power_good_off value by 1.6v power_good_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 ~13.2 v - 12 must be less than power_good_on value by 1.6v ton_delay 0x6 0 sets the time from a start condition is received until the output voltage starts to rise r/w word yes time linear 7 5~500 ms - 1 /
ds_ q48s g 120 42 _0 8062013 15 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 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 28 15~500 ms - 1 / status_word 0x79 returns the information with a summary of th e module's fault/warning read word refer to below description; bit field / / / / / status_vout 0x7a returns the information of the module's output voltage related fault/warning read byte refer to below description; bit field / / / / / status_iout 0x7b re turns the information of the module's output current related fault/warning read byte refer to below description; bit field / / / / / status_input 0x7c returns the information of the module's input over voltage and under voltage fault read byte refer to be low description; bit field / / / / / status_temperature 0x7d returns the information of the module's temperature related fault/warning read byte refer to below description; bit field / / / / / status_cml 0x7e returns the information of the module's commu nication related faults. read byte refer to below description; bit field / / / / / read_vin 0x88 returns the input voltage of the module read word yes vin linear / / volts / / read_vout 0x8b returns the output voltage of the module read word yes vout lin ear / / volts / / read_iout 0x8c returns the output current of the module read word yes iout linear / / amps / / read_temperature_1 0x8d returns the module's hot spot temperature of the module read word yes temp linear / / deg. c / / pmbus_revision 0x98 reads the revision of the pmbus read byte yes bit field 1.2 / / / /
ds_ q48s g 120 42 _0 8062013 16 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 mfr_ c2_configure 0xe1 configures the c2 pin (secondary on/off pin) function and logic; r/w byte refer to below description; bit field 0x00 / / / /
ds_ q48s g 120 42 _0 8062013 17 features description s (con.) operation [0x01] b it number purpose bit v alue meaning default settings 0x80 7: enable/disable the module 1 output is enabled 1 0 output is disabled 6:0 reserved 0000000 on_off_config [0x02] bit number purpose bit v alue meaning default settings 0x1d (negative) /0x1f (positive) 7: 5 reserved 000 4 controls how the unit responds to the primary on/off pin and the operation command; 1 module does not power up until commanded by the primary on/off pin and the operation 1 0 module power up at any time regardless of the state of the primary on/off pin and the opera tion 3 controls how the unit responds to the operation command 1 module responds to the 7 bit in the operation 1 0 module ignores the 7 bit in the operation 2 controls how the unit responds to the primary on/off pin 1 module requires the primary o n/off pin to be asserted to start the unit 1 0 module ignores the state of the primary on/off pin 1 control logic of primay on/off pin 1 positive logic 0, negative; 1, positive. 0 negative logic 0 unit turn off delay time control 1 shut down the module with 0 delay cycle 1 vout_ov_fault_response [0x 41 ] 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 1 0 5: 3 retry setting 111 unit continuously restarts while fault is present until commanded off 111 000 u nit does not attempt to restart on fault 2:0 delay time setting 000 no delay supported 000 iout_oc_fault_response [0x 47 ] 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 1 1 , 5:3 retry settings 111 unit conti nuously restarts while fault is present until commanded off 111 000 u nit does not attempt to restart on fault 2:0 delay time setting 000 no delay supported 000
ds_ q48s g 120 42 _0 8062013 18 features description s (con.) ot_fault_response [0x 50 ] bit number purpose bit v alue meaning default settings 0xb8 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 continuously restarts while fault is present until commanded off 111 000 u nit does not attempt to restart on fault 2:0 delay time setting 000 n o delay supported 0 00 status_word [0x 79 ] 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 voltage fault, including over v oltage 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 (t he unit is not providing power to the output, regardle ss 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 warn ing 1 occurred 0 no occurred 1 cml ( a communications, memory or logic fault 1 o ccurred 0 no occurred 0 reserved
ds_ q48s g 120 42 _0 8062013 19 features description s (con.) status _vout [0x 7 a ] bit number purpose bit v alue meaning 7 output o ver voltage fault 1 o ccurred 0 no occurred 6 output o ver voltage warning 1 o ccurred 0 no occurred 5: 0 reserved status_iout [0x 7b ] bit number purpose bit v alue meaning 7 output o v er current fault 1 o ccurred 0 no occurred 6 reserved 5 output o ver current warning 1 o ccurred 0 no occurred 4: 0 reserved status_input [0x 7c ] bit number purpose bit v alue meaning 7 input o ver voltage fault 1 o ccurred 0 no occurred 6: 5 reserved 4 input under voltage fault 1 o ccurred 0 no occurred 3: 0 reserved status_temperature [0x 7d ] bit number purpose bit v alue meaning 7 over temperature fault 1 o ccurred 0 no occurred 6 over temperature warning 1 o ccurred 0 no occurred 5: 0 reserved
ds_ q48s g 120 42 _0 8062013 20 features description s (con.) status_cml [0x 7e ] bit number purpose bit v alue meaning 7 inv alid/unsupported command received 1 o ccurred 0 no occurred 6 invalid/unsupported dat a received 1 o ccurred 0 no occurred 5 packet error check failed 1 o ccurred 0 no occurred 4:0 reserved mfr_ c2_configure [0x e1 ] bit number purpose bit v alue meaning default settings 0x00 7: 2 reser ved 000000 1 secondary on/off configuration 1 and C primary and secondary side on/off 0 0 c2 is ignored 0 secondary side on/off logic 1 positive logic 0 0 negative logic
ds_ q48s g 120 42 _0 8062013 21 features description s (con.) output voltage adjustment (trim) to increase or d ecrease the output voltage 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. below trim equation is only adapt to the module without droop current shari ng option code; for the module with droop current sharing option code, please contact deltas technical support team. figure 1 9 : circuit configuration for trim - down (decrease output voltage) if the external resistor is connected between the trim and vo ( - ) pins, the output voltage set point decreases (fig. 1 9 ). the external resistor value required to obtain a percentage of output voltage change % is defined as: ex. when trim - down - 10 % ( 12 v0. 9 = 10.8 v) figure 20 : circuit configuration for trim - up (increase output voltage) if the external resistor is connected between the trim and vo ( + ) the output voltage set point increases (fig. 20 ). the external resistor value require d to obtain a percentage output voltage change % is defined as: ex. when trim - up +1 0% ( 12 v1.1= 13.2 v) care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power. thermal consideratio ns thermal management is an important part of the system design. to ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire 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 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 powe r 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 operating temperature. if the temperature exceeds the maximum module temperature, reliability of the unit may be affected. ? ? ? ? ? ? ? ? ? ? ? ? ? k down rtrim 2 . 10 511 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? k k down rtrim 9 . 40 2 . 10 10 511 ? ? ? ? ? ? ? ? ? ? ? k up rtrim 2 . 10 511 1.225 ) (100 vo 11 . 5 ? ? ? ? ? ? ? ? ? ? ? ? k up rtrim 3 . 89 4 2 . 10 10 511 10 225 . 1 ) 10 100 ( 2 1 11 . 5 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 g 120 42 _0 8062013 22 thermal curves (with heat spreader) figure 22 : * hot spot temperature measured point . the allowed maximum hot spot temperature is defined at 1 0 3 figure 23 : output current vs. ambient temperature and air velocity @vin= 48 v (transv ers e orientation, airflow from vin+ to vin - , with heat s preader) thermal curves ( with 0.5 figure 24 : * hot spot temperature measured poin t . the allowed maximum hot spot temperature is defined at 100 figure 25 : output current vs. ambient temperature and air velocity @vin= 48 v (transverse orientation , airflow from vin+ to vin - , with 0.5 height heat s ink ) airflow 5.6mm (0.22") 20.8mm (0.82") 0 5 10 15 20 25 30 35 40 25 30 35 40 45 50 55 60 65 70 75 80 85 output current (a) ambient temperature ( ) q48sg12042(standard) output current vs. ambient temperature and air velocity @vin = 48v (transverse orientation,with heat spreader) natural convection 100lfm 300lfm 200lfm 400lfm 500lfm 600lfm 20.8mm (0.82") airflow 5.6mm (0.22") 0 5 10 15 20 25 30 35 40 25 30 35 40 45 50 55 60 65 70 75 80 85 output current (a) ambient temperature ( ) q48sg12042(standard) output current vs. ambient temperature and air velocity @vin = 48v (transverse orientation,with 0.5" height heat sink) natural convection 100lfm 300lfm 200lfm 400lfm 500lfm 600lfm
ds_ q48s g 120 42 _0 8062013 23 mechanical drawing (with heat spreader) *for modules with through - hol e 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.
ds_ q48s g 120 42 _0 8062013 24 pin specification: pins 1 - 3&5 1.0 0 mm (0.040) diameter ( all pins are copper with matte tin plating over nickel under plating ) pins 4 & 6 2. 1.50 mm (0.0 59 ) diameter ( all pins are copper with matte tin plating over nickel under plating ) p ins 7 - 13 1. sq 0.50mm( 0.020 ) ( all pins are copper with gold flash plating )
ds_ q48s g 120 42 _0 8062013 25 par t numbering system q 48 s g 120 42 n r f c type of product input voltage number of outputs product series output voltage output current on/off logic pin length /type option code q - quarter brick 48 - 3 8 ~75v s - single g C full d igital control 120 C 1 1.8 v 42 - 42a n - negative p - positive k C 0.110 n - 0.145 r - 0.170 f - rohs 6/6 (lead free) droop current sharing trim pin pmbus pin heat spreader c n o yes n o yes d no no no yes g n o yes y es yes h yes yes , but n o function yes yes model list model name input output eff @ 100% load q48s g 120 42 nrf c 3 8 v~75v 1 5 a 11.8 v 42 a 9 5.3 % 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 office . 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: telephone: +31 - 20 - 655 - 0967 fax: +31 - 20 - 655 - 0999 email: dcdc@delta - es. com asia & the rest of world : telephone: +886 3 4526107 x 6220 ~6224 fax: +886 3 4513485 emai l: 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 bel ieved 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 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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