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pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 1 t t echnical echnical s s pecification pecification bq50120qt bq50120qt a25 a25 t t h h e e b b u u s s q q o o r r ? ? b b q q 5 5 0 0 1 1 2 2 0 0 q q t t a a 2 2 5 5 b b u u s s c c o o n n v v e e r r t t e e r r i i s s a a n n e e x x t t - - g g e e n n - - e e r r a a t t i i o o n n , , b b o o a a r r d d - - m m o o u u n n t t a a b b l l e e , , i i s s o o l l a a t t e e d d , , f f i i x x e e d d s s w w i i t t c c h h i i n n g g f f r r e e q q u u e e n n - - c c y y d d c c / / d d c c c c o o n n v v e e r r t t e e r r t t h h a a t t u u s s e e s s s s y y n n c c h h r r o o n n o o u u s s r r e e c c t t i i f f i i c c a a t t i i o o n n t t o o a a c c h h i i e e v v e e e e x x t t r r e e m m e e l l y y h h i i g g h h c c o o n n v v e e r r s s i i o o n n e e f f f f i i c c i i e e n n c c y y . . t t h h e e p p o o w w e e r r d d i i s s s s i i p p a a t t e e d d b b y y t t h h e e c c o o n n v v e e r r t t e e r r i i s s s s o o l l o o w w t t h h a a t t a a h h e e a a t t s s i i n n k k i i s s n n o o t t r r e e q q u u i i r r e e d d , , w w h h i i c c h h s s a a v v e e s s c c o o s s t t , , w w e e i i g g h h t t , , h h e e i i g g h h t t , , a a n n d d a a p p p p l l i i c c a a t t i i o o n n e e f f f f o o r r t t . . t t h h e e b b u u s s q q o o r r s s e e r r i i e e s s p p r r o o v v i i d d e e s s a a n n i i s s o o l l a a t t e e d d s s t t e e p p d d o o w w n n v v o o l l t t a a g g e e f f r r o o m m 4 4 8 8 v v t t o o a a 1 1 2 2 v v i i n n t t e e r r m m e e d d i i a a t t e e b b u u s s w w i i t t h h n n o o r r e e g g u u - - l l a a t t i i o o n n i i n n a a s s t t a a n n d d a a r r d d q q u u a a r r t t e e r r - - b b r r i i c c k k m m o o d d u u l l e e . . b b u u s s q q o o r r c c o o n n - - v v e e r r t t e e r r s s a a r r e e i i d d e e a a l l f f o o r r c c u u s s t t o o m m e e r r s s w w h h o o n n e e e e d d m m u u l l t t i i p p l l e e o o u u t t p p u u t t s s a a n n d d w w i i s s h h t t o o b b u u i i l l d d o o r r b b u u y y p p o o i i n n t t o o f f l l o o a a d d c c o o n n v v e e r r t t e e r r s s t t o o w w o o r r k k w w i i t t h h a a 1 1 2 2 v v r r a a i i l l . . r r o o h h s s c c o o m m p p l l i i a a n n t t ( ( s s e e e e p p a a g g e e 1 1 2 2 ) ) . . bq50120qt a25 module bus bus conver conver ter ter 42-53v 42-53v 12v 12v 300w 300w att att 2000vdc 2000vdc quar quar ter-brick ter-brick input input output output power power isolation isolation dc bus conver dc bus conver ter ter ? ultra-high efficiency, >96% at full rated load current ? delivers up to 25 amps (300 watts) of output current (power) with minimal derating - no heatsink required ? input voltage range: 42v C 53v ? fixed frequency switching provides predictable emi per- for mance operational features operational features ? on/off control referenced to input side ? current sharing allowed without the use of any external circuitry. contr contr ol features ol features ? industry standard quarter-brick bus converter pin-out ? industry standard size: 1.45 x 2.3 (36.8x58.4mm) ? total height only 0.43 (10.9mm), permits better airflow and smaller card pitch ? total weight: 1.5 oz. (42 grams) ? flanged pins designed to permit surface mount solder- ing (can avoid wave solder) using fpip technique mechanical features mechanical features ? 2000v, 30 m w input-to-output isolation ? ul/cul 60950-1 recognized (us & canada), basic insulation rating ? tuv cer tified to en60950-1 ? meets 72/23/eec and 93/68/eec directives ? meets ul94v-0 flammability requirements safety features safety features ? input under-voltage lockout and over-voltage shutdown protects against abnor mal input voltages ? output current limit and short circuit protection ? output over-voltage protection ? thermal shutdown pr pr otection features otection features
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 2 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification pin no. name function 1 vin(+) input positive (42v - 53v) 2 on/off logic control input to turn converter on and off. 3 vin(-) input negative 4 v out(-) output negative 5 vout(+) output positive notes 1) pins 1-3 are 0.040 (1.02mm) diameter with 0.080 (2.03 mm) diameter standoff shoulders. 2) pins 4 and 5 are 0.062 (1.57 mm) diameter with 0.100 (2.54 mm) diameter standoff shoulders. 3) other pin extension lengths available. recommended pin length is 0.03 (0.76mm) greater than the pcb thickness. 4) all pins: material - copper alloy finish (6/6 rohs) - matte tin over nickel plate finish (5/6 rohs) - tin/lead over nickel plate 5) undimensioned components are shown for visual reference only. 6) all dimensions in inches (mm) t olerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 7) weight: 1.5 oz. (42 g) typical 8) w orkmanship: meets or exceeds ipc-a-610c class ii 9) ul/tuv standards require a clearance of 0.04 (1.02mm) around primary areas of the module. refer to section on keep out areas under application considerations for details. 10) the flanged pins are designed to permit surface mount soldering (allowing to avoid the wave soldering process) through the use of the flanged pin-in-paste technique. 0.300 (7.62) 0 .600 (15.24) 1.45 (36.8) 0.43 (10.8) 0.600 (15.24) 0.14 (3.6) 2 .30 (58.4) 2.00 (50.8) top view side view mechanical diagram load board bottom side clearance see note 9 lowest component 0.43 (10.9) 0.060+/-0.030 (1.52+/-0.76) 0.145 (3.68) see note 3 pin designa tions flanged pin see note 10
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 3 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification parameter min. typ. max. units notes & conditions absolute maximum ratings input voltage non-operating 60 v continuous operating 56 v continuous isolation voltage (input to output) 2000 v basic insulation, pollution degree 2 operating temperature -40 100 c storage temperature -55 125 c voltage at on/off input pin -2 12 v input characteristics operating input voltage range 42 48 53 v input under-voltage lockout turn-on voltage threshold 39.5 v turn-off voltage threshold 38.0 v lockout voltage hysteresis 1.5 v input over-voltage shutdown turn-off voltage threshold 55.0 v vin when unit will shut down turn-on voltage threshold 54.0 v vin when unit turns on after shutdown event maximum input current 6.8 a 100% load, 42 vin no-load input current 0.07 0.11 a disabled input current 7.5 15 ma inrush current transient rating 0.01 a 2 si 2 t rating of external fuse should be higher input reflected-ripple current 5 ma rms through 10 h inductor; figures 12 & 14 input terminal-ripple current 75 100 ma rms, full load; figures 12 & 13 recommended input fuse 1 12 a fast blow external fuse recommended input filter component values (c\l\c) 1\1\4.4 f\h\f internal values recommended external input capacitance 47 f typical esr 0.1-0.2 w , see figure 12 output characteristics output v oltage set point 12.00 v 48v in, no load output v oltage regulation over line + 10 \ 1.2 %\v figure 4 over load + 4.1 \ 500 %\mv figure 4 over t emperature + 1.7 \ 200 %\mv figure 4 t otal output v oltage range 9.7 13.3 v over sample, line, load, temperature & life output v oltage ripple and noise 2 20mhz bandwidth; figures 12 & 15 peak-to-peak 100 150 mv full load, see figures 12 & 15 rms 25 40 mv full load, see figures 12 & 15 operating output current range 0 25 a subject to ther mal derating; figures 5 - 8 output dc current-limit inception 34 a output voltage 10% low; figure 16 output dc current-limit shutdown v oltage 8 v current share accuracy (2 units paralleled) + 10 % % of rated output current back-drive current limit while disabled 10 ma negative current drawn from output maximum output capacitance 3,000 f 12vout at 25a resistive load dynamic characteristics output voltage during load current transient for a step change in output current (0.1a/s) 200 mv 50% to 75% to 50% iout max; figure 11 settling time 100 s to within 1% vout nom turn-on transient turn-on time 500 s full load, vout=90% nom.; figures 9 & 10 start-up inhibit time 2 ms -40c to +125c; figure e output voltage overshoot 5 % 5,000 f load capacitance, iout = 0a efficiency 100% load 96.1 % figure 1 50% load 96.4 % figure 1 temperature limits for power derating curves semiconductor junction temperature 125 c package rated to 150c board temperature 125 c ul rated max operating temp 130c transformer temperature 125 c see figures 5 - 8 for derating curves isolation characteristics isolation voltage (dielectric strength) 3 2000 v isolation resistance 30 m w isolation capacitance 4 470 pf bq50120qta25 electrical characteristics t a =25c, airflow rate=300 lfm, v i n =48vdc unless otherwise noted; full operating temperature range is -40c to +100c ambient tem- perature with appropriate power derating. specifications subject to change without notice. note 1: ul's product certification tests were carried out using 20a fast blow fuse. fuse interruption characteristics have to be taken into account while designing input traces. user should ensure that input trace is capable of withstanding fault currents until fuse blows. note 2: for applications requiring reduced output voltage ripple and noise, consult synqor applications support (e-mail: suppor t@synqor .com ) note 3: for modules with isolation voltage rating of 2250v, order the feature set option c. see last page for ordering details. note 4: higher values of isolation capacitance can be added external to the module.
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 4 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification parameter p min. typ. max. units notes & conditions f eature characteristics switching frequency 127.5 150 172 khz on/off control (option p) figure b off-state voltage -1.0 0.8 v on-state voltage 2.4 18 v on/off control (option n) figure b off-state voltage 2.4 18 v on-state voltage -1.0 0.8 v output over-voltage protection 13.75 v over full temp range; no load over-temperature shutdown 120 c average pcb temperature over-temperature shutdown restart hysteresis 10 c load current scale factor 800 see app note: output load current calc. r eliability characteristics calculated mtbf (telcordia) 2.7 10 6 hrs. tr-nwt-000332; 100% load,300lfm, 40 o c t a calculated mtbf (mil-217) 2.0 10 6 hrs. mil-hdbk-217f; 100% load, 300lfm, 40 o c t a field demonstrated mtbf 10 6 hrs. see our website for details standards compliance parameter p notes st andards compliance ul/cul 60950-1 file # e194341, basic insulation & pollution degree 2 en60950-1 cer tified by tuv 72/23/eec 93/68/eec needle flame t est (iec 695-2-2) t est on entire assembly; board & plastic components ul94v -0 compliant iec 61000-4-2 esd test, 8kv - np , 15kv air - np (nor mal per for mance) gr-1089-core section 7 - electrical safety , section 9 - bonding/grounding ? an external input fuse must always be used to meet these safety requirements. contact synqor for official safety cer tificates on new releases or download from the synqor website . qualifica tion testing parameter p # units test conditions qualifica tion testing life t est 32 95% rated v in and load, units at derating point, 1000 hours v ibration 5 10-55hz sweep, 0.060 total excursion,1 min./sweep, 120 sweeps for 3 axis mechanical shock 5 100g minimum, 2 drops in x and y axis, 1 drop in z axis t emperature cycling 10 -40c to 100c, unit temp. ramp 15c/min., 500 cycles power/ther mal cycling 5 t operating = min to max, v in = min to max, full load, 100 cycles design marginality 5t min -10c to t max +10c, 5c steps, v in = min to max, 0-105% load humidity 5 85c, 85% rh, 1000 hours, 2 minutes on and 6 hours off solderability 15 pins mil-std-883, method 2003 ? extensive characterization testing of all synqor products and manufacturing processes is performed to ensure that we supply robust, reliable product. contact the factor y for official product family qualification documents. electrical characteristics (continued) options synqor provides various options for logic sense, pin length and feature set for this family of dc/dc converters. please consult the last page of this specification sheet for information on available options. p a tents synqor is protected under various patents, see the last page.
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 5 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification 86 88 90 92 94 96 98 100 0 5 10 15 20 25 load current (a) e f f i c i e n c y ( % ) 43 vin 48 vin 52 vin 0 24 6 8 10 12 0 5 10 15 20 25 load current (a) p o w e r d i s s i p a t i o n ( w ) 43 vin 48 vin 52 vin figure 2: power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25 c. 92 93 94 95 96 97 98 0 100 200 300 400 500 air flow (lfm) e f f i c i e n c y ( % ) 25 c 40 c 55 c figure 3: efficiency at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25 c, 40 c, and 55 c (nominal input voltage). 8 9 10 11 12 13 14 15 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 load current (a) o u t p u t v o l t a g e ( v ) 43vin 48vin 53vin figure 4: output voltage regulation vs. load current for minimum, nom- inal, and maximum input voltage at 25 c. 0 5 10 15 20 25 02 5 4 0 5 5 7 0 8 5 ambient air temperature ( o c) i o u t ( a ) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 2 0 0 lfm (1.0 m/s) 1 00 lfm (0.5 m/s) 5 0 lfm (0.25 m/s) figure 5: maximum output power derating cur ves vs. ambient air tem - perature for airflow rates of 50 lfm through 400 lfm with air flowing from pin 3 to pin 1 (nominal input voltage). figure 6: thermal plot of conver ter at 25 amp load cur r ent (300w) with 55 c air flowing at the rate of 200 lfm. air is flowing across the converter from pin 3 to pin 1 (nominal input voltage). figure 1: efficiency at nominal output voltage vs. load current for min- imum, nominal, and maximum input voltage at 25 c. semiconductor junction temperature is within 1 c of surface temperature
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 6 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification figure 12 : test set-up diagram showing measurement points for input t erminal ripple current (figure 13 ), input reflected ripple current (figur e 14 ) and output voltage ripple (figure 15 ). 10 h source impedance dc/dc conver ter see fig. 14 see fig. 13 see fig. 15 1 f ceramic capacitor 15 f, 450m w esr tantalum capacitor 47 f, <1 w esr electrolytic capacitor v source i s i c v out 0 5 10 15 20 25 0 25 40 55 70 85 ambient air temperature ( o c) i o u t ( a ) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 50 lfm (0.25 m/s) figure 7: maximum output power derating curves vs. ambient air tem- peratur e for airflow rates of 50 lfm thr ough 400 lfm with air flowing from input to output (nominal input voltage). figure 8: thermal plot of converter at 25 amp load current (300w) with 55 c air flowing at the rate of 200 lfm. air is flowing acr oss the converter from input to output (nominal input voltage). figure 9: turn-on transient at full load (resistive load) (100 s/div). ch 1: v out (5v/div) figure 10: turn-on transient at zero load (100 s/div). ch 1: vout (5v/div) figure 1 1 : output voltage r esponse to step-change in load cur r ent (50%-75%- 50% of iout(max); di/dt = 0.1a/ s). load cap: 15 f, 100 m w esr tantalum cap and 1 f ceramic cap. top trace: vout (200mv/div), bottom trace: iout (5a/div). s emiconductor junction temperature is within 1 c of surface temperature
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 7 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification figure 13: input terminal ripple current, i c , at full rated output cur- r ent and nominal input voltage with 10 h sour ce impedance and 47 f electrolytic capacitor (100 ma/div). see figure 12 . figure 14: input reflected ripple current, i s , through a 10 h source inductor at nominal input voltage and rated load cur r ent (5 ma/div). see figure 12 . figure 15: output voltage ripple at nominal input voltage and rated load current (50 mv/div). load capacitance: 1 f ceramic capacitor and 15 f tantalum capacitor. bandwidth: 20 mhz. see figure 12 . 4 56 7 89 10 11 12 13 14 0 5 10 15 20 25 30 35 40 load current (a) o u t p u t v o l t a g e ( v ) 43v 48v 53v figure 16: output voltage vs. load current showing typical current limit curves and converter shutdown points. figure 17: load cur r ent (50a/div) as a function of time when the con - ver ter attempts to turn on into a 1 m w shor t cir cuit. t op trace (500 s/div) is an expansion of the on-time por tion of the bottom trace.
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 8 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification basic operation and features with voltages dropping and currents rising, the economics of an intermediate bus architecture (iba) are becoming more attractive, especially in systems requiring multiple low voltages. iba systems separate the role of isolation and voltage scaling from regulation and sensing. the bus qor series bus converter provides isolation and a coarse voltage step down in one compact module, leaving regulation to simpler, less expensive non-isolated converters. in figure a below, the bus qor module provides the isolation stage of the iba system. the isolated bus then distributes power to the non-isolated buck regulators to generate the required volt- age levels at the point of load. in this case, the bucks are rep- resented with synqors ni qor series of non-isolated dc/dc con- verters. in many applications requiring multiple low voltage out- puts, significant savings can be achieved in board space and overall system costs. when designing an iba system with bus converters, the designer can select from a variety of bus voltages. while there is no uni - versally ideal bus voltage, most designs employ one of the fol - lowing: 12v , 9v , 7.5v , 5v , or 3.3v . higher bus voltages can lead to lower efficiency for the buck regulators but are more effi - cient for the bus conver ter and provide lower board level distrib - ution current. lower bus voltages offer the opposite trade offs. synqor s 12v out bus qor module acts as a true dc transfor mer . the output voltage is proportional to the input voltage, with a specified turns ratio or voltage ratio, plus minor drop from the internal resistive losses in the module. when used in iba sys- tems, the output variation of the bus qor must be in accordance with the input voltage range of the non-isolated converters being employed. the bus qor architecture is very scalable, meaning multiple bus converters can be connected directly in parallel to allow current sharing for higher power applications. control features remote on/off (pin 2 ): the on/off input, pin 2, permits the user to control when the converter is on or off . this input is referenced to the return terminal of the input bus, vin(-). there are two versions of the converter that differ by the sense of the logic used for the on/off input. in the positive logic version, the on/off input is active high (meaning that a high tur ns the conver ter on ). in the negative logic version, the on/off signal is active low (meaning that a low tur ns the converter on ). figure b is a detailed look of the inter nal on/off circuitry. positive logic enabled modules have n-channel fet populated. negative logic enabled modules have p-channel fet populated. protection features input under-voltage lockout : the converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the appli- cation note titled input system instability available on the synqor website . the lockout circuitry is a comparator with dc hysteresis. when the input voltage is rising, it must exceed the typical turn-on voltage threshold value (listed on the specifica - tion page ) before the converter will turn on. once the converter is on, the input voltage must fall below the typical turn-off v oltage threshold value before the conver ter will tur n off. also see figure e . figure a: example of intermediate bus architecture using busqor bus conver ter and niqor non-isolated conver ters 48vdc front end loads typical user board 0.9 v 1.5 v 1.8 v 2.5 v 3.3 v bus qor converter niqor converters 48vdc 42-53v 12vdc figure b: internal on/off pin circuitry n-channel fet 5 k w 100 k w 30 k w 13v vref (8v) vin+ vin- on/off control p-channel fet
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 9 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification output current limit : the output of the bus qor module is electronically protected against output overloads. when an over- load current greater than the dc current-limit inception speci- fication is drawn from the output, the output shuts down to zero volt in a period of 40s typical (see figure c). the shutdown period lasts for a typical period of 250ms (figure d) after which the bus qor tries to power up again. if the overload persists, the output voltage will go through repeated cycles of shutdown and restart with a duty cycle of 40s (on) and 250ms (off) respec- tively. the bus qor module returns (auto resetting) to normal oper- ation once the overload is removed. the bus qor is designed to survive in this mode indefinitely without damage and without human intervention. output short circuit protection : when the output of the bus qor module is shorted, a peak current of typically 50 a will flow into the short circuit for a period of about 300s. the out- put of the bus qor will shutdown to zero volts for the same period (figure d). the shutdown period lasts for a period of 250ms, at the end of which the bus qor module tries to power up again. if the short circuit persists, the output voltage will go through repeat- ed cycles of shutdown and restart with a duty cycle of 350s (on) and 250ms (off) respectively. the bus qor module returns (auto resetting) to normal operation once the short circuit is removed. the bus qor is designed to survive in this mode indef- initely without damage and without human intervention. in the auto resetting mode, also referred to as hiccup mode, the power drawn from the 48v input is about 5 watts, most of which is dissipated into the external fault. it is important that cop- per traces and pads from the output circuit be designed to with- stand the short term peaks, although the average current into the fault may be as low as 50ma typical. see figure 17 for appro- priate waveform. over-temperature shutdown : a temperature sensor on the conver ter senses the average temperature of the module. the ther mal shutdown circuit is designed to tur n the conver ter off when the temperature at the sensed location reaches the over - t emperature shutdown value. it will allow the conver ter to tur n on again when the temperature of the sensed location falls by the amount of the over -t emperature shutdown restart hysteresis value. applica tion considera tions star t-up inhibit period : figure e details the star t-up inhibit period for the bus qor module. at time t 0 , when v in is applied with on/off pin asserted (enabled), the bus qor output begins to build up. before time t 1 , when the input voltage is below the uvl threshold, the unit is disabled by the input under -voltage lockout feature. when the input voltage rises above the uvl threshold, the input under-voltage lockout is released, and a typical startup inhibit period of 350s is initiated. the output builds up to 90% or higher of the nominal voltage and stabilizes at the nominal value of 12v in a period of 420s typical. the rise time from 0v to 90% is 70 s typical. at time t 2 , when the on/off pin is de-asser ted (disabled), the bus qor output instantly drops to 0v. fall time from 12v to 0v is dependent on output capacitance and any parasitic trace induc - tance in the output load circuit. at time t 3 , when the on/off pin is re-asserted (enabled), the bus qor module output begins to build up after the inhibit period of 350s typical. refer to the control features section of the data sheet for details on enabling and disabling methods for n and p logic type mod- ules. output current output v oltage 12v 35a 25a 40s 0v figure c: output overload protection diagram (not to scale) output current output voltage <12v 50a peak 250ms 300s 0v figure d: output short circuit and auto-resetting protection diagram (not to scale) time t ime
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 10 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification keep out areas : component keep out area : keep out areas for components not referenced to the primary circuit are shown in shaded areas in figure f. the keep out areas shown are consistent with ul's requirements for basic insulation of 0.04" (40 mils) for pollution degree 2. user should consult ul standards for other insulation classes and operating environments. for applications that require mounting parts below the bus qor module, one should be aware of potential high levels of electro- magnetic interference, in addition to safety keep out. users are advised to consult synqor applications engineering in such applications. copper keep out area : keep out areas shown in figure f are to be observed for top layer copper traces and vias. internal lay- ers buried one or more layers may be exempt, depending on the pcb material grade and thickness. users are advised to consult ul standards for details. all layers including top and bottom, are subject to the keep out areas shown around primary pins of bus qor module. actual keep outs along the sur face (creepage) may var y depending on the pcb material cti. users are advised to consult ul standards for details. bridging components : bridging components like emi filter capacitors required to be placed as close as possible to the bus qor module for optimum performance must observe the clear- ance/creepage requirements of 0.04"(40 mils) between pads to maintain compliance to ul standards for the overall power sys - tem. note : referenced keep out widths are adequate to withstand ul's basic insulation dielectric strength tests for approved pcb materials. applications requiring double or reinforced insulation must double the keep out widths shown in figure f. keep out areas shown have standard margins above ul's minimum requirements. output load current calculation : the bus qor series allows the converter output load to be measured without adding a current loop or exter nal shunt resistor to the designers pcb board under test. on the top side of the bus qor conver ter is a current sense resistor as shown in figure g . the output load cur- rent is proportional to the voltage drop across this sense resistor. this calculation is detailed below. a current sense resistor referenced to the primary input is used in the equation below to calculate the output load current. i load = ( v rsense(load) - v rsense(no load) ) x 800 where: i load = output load current v rsense(load) = voltage across the sense resistor with converter under load v rsense(no load) = voltage across the sense resistor with converter at zero load figure e: power up/down diagram (not to scale) showing start-up inhibit period. vin vout 12v on/off ( n logic) uvlo off 2ms 16ms 16.1ms on t 0 t 1 t 2 t 3 t figure f: keep out areas for busqor module 0.023 0.01 0.01 1.50 primary secondary bridging capacitor time
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 11 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification the number 800 is a load current scale factor for this prod- uct, valid only for vin = 48v. hence, measurement should be made at this input voltage. the voltage drop across the sense resistor is about 25mv at full load of 25a. therefore, proper measuring techniques must be used to ensure accuracy. a calibrated dmm set to 300mv is acceptable. since this measurement is done on the primary area of the converter, a slight non-linearity may be observed over the load current range. using the scale factor referenced above, the error may be on the order of 4%. for more detailed information consult the application note on synqor s website titled output load current calculations. current sharing : bus qor modules are designed to operate in parallel without the use of any external current share circuitry. a typical circuit for paralleling two bus qor modules is shown in figure h. an output capacitor is recommended across each mod- ule and located close to the converter for optimum filtering and noise control performance. dedicated input inductors are rec- ommended but are considered optional. input capacitors must be located close to the converter module. pcb layout in the input circuit should be such that high frequency ripple currents of each module is restricted to a loop formed by the input capacitors and the input terminals of the bus qor module. see figure k for details on pcb layout. contact synqor application engineering for further assistance on pcb trace design. the current share performance of two paralleled modules is illus- trated in the graph in figure j. in this graph the percent devia- tion from ideal sharing (50%) is plotted for each module versus the total output load current at 48vin. figure h: busqor output paralleling for incr eased cur r ent output. figure g: location of sense resistors bus qor module (n logic option) v in 12v out 50a 1 2 3 1 2 3 5 4 5 4 bus qor module (n logic option) figure j: cur r ent shar e performance of 2 paralleled modules figure k: recommended pcb layout for input circuit -8% -6% -4% -2% 0% 2% 4% 6% 8% 10% 5 10 15 20 25 30 35 40 total load current ( a) d e v i a t i o n f r o m 5 0 / 5 0 s h a r i n g ( % ) module 1 module 2 48v in cm emi filter bulk cap input lc filters bus qor module bus qor module (not shown in figure h)
pr oduct # bq50120qt a25 phone 1-888-567-9596 www .synqor .com doc.# 005-2bq512m rev. d 03/26/10 page 12 input: input: output: output: current: current: p p ackage: ackage: 42-53 v 42-53 v 12 v 12 v 25 a 25 a quarter-brick quarter-brick t t echnical s echnical s pecification pecification part numbering system the part numbering system for synqors bus qor dc bus con- verters follows the format shown in the example below. the first 12 characters comprise the base par t number and the last 3 characters indicate available options. although there are no default values for enable logic and pin length, the most common options are negative logic and 0.145 pins. these part numbers are more likely to be readily available in stock for evaluation and prototype quantities. a -g suffix indi - cates 6/6 rohs compliance. application notes a variety of application notes and technical white papers can be downloaded in pdf for mat from our website . ordering information the tables below show the valid model numbers and ordering options for converters in this product family. when ordering synqor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional 3 characters for options. to order 6/6 rohs compliant product please add a -g suffix. the following option choices must be included in place of the x y z spaces in the model numbers listed above. units with option c for the feature set are a standard unit with the common mode capacitor removed. the isolation voltage rating of the c option unit is 2250vdc. rohs compliance: the eu led rohs (restriction of hazardous substances) directive bans the use of lead, cadmium, hexavalent chromium, mercur y , polybrominated biphenyls (pbb), and polybrominated diphenyl ether (pbde) in electrical and electronic equipment. this synqor product is available as 5/6 rohs compliant (product with lead) or 6/6 rohs compliant. for more information please refer to synqors rohs addendum available at our rohs compliance / lead free initiative web page or e-mail us at rohs@synqor .com . w arranty synqor offers a three (3) year limited warranty. complete warranty information is listed on our website or is available upon request from synqor. information furnished by synqor is believed to be accurate and reliable. however, no responsibility is assumed by synqor 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 synqor. contact synqor for fur ther information: phone : 978-849-0600 t oll free : 888-567-9596 fax : 978-849-0602 e-mail : power@synqor .com w eb : www .synqor .com address : 155 swanson road boxborough, ma 01719 usa output max output voltage current bq55090qta27 xyz 36 - 55 v 9.6 v 27 a bq50120qta20 xyz 42 - 53 v 12 v 20 a bq50120qta25 xyz 42 - 53 v 12 v 25 a input voltage model number enable pin feature logic length set p - positive n - negative k - 0.110" n - 0.145" r - 0.180" y - 0.250" s - standard c - no common mode capacitor options description: x y z bq 50 120 q t a 25 n n s product family package size performance level thermal design output current options (see ordering information) input voltage output voltage patents synqor holds the following u.s. patents, one or more of which apply to each product listed in this document. additional patent applications may be pending or filed in the future. 5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146 7,119,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702

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