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pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 1 t t echnical echnical s s pecification pecification bq55090et bq55090et a27 a27 t t h h e e b b u u s s q q o o r r ? ? b b q q 5 5 5 5 0 0 9 9 0 0 e e t t a a 2 2 7 7 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 9 9 . . 6 6 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 e e i i g g h h t t h h - - 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 r r e e a a t t i i n n g g t t h h e e m m i i d d - - b b u u s s v v o o l l t t a a g g e e r r e e q q u u i i r r e e d d t t o o d d r r i i v v e e p p o o i i n n t t - - o o f f - - l l o o a a d d ( ( n n o o n n - - i i s s o o l l a a t t e e d d ) ) c c o o n n v v e e r r t t e e r r s s i i n n 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 a a r r c c h h i i t t e e c c - - t t u u r r e e s s . . 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 ) ) . . bq55090et a27 module bus bus conver conver ter ter 35-55v 35-55v 9.6v 9.6v 27a 27a 2000vdc 2000vdc eighth-brick eighth-brick input input output output current current isolation isolation dc bus conver dc bus conver ter ter ? ultra-high efficiency , >95% at full rated load current ? delivers up to 27 amps of output current with minimal derating - no heatsink required ? input voltage range: 35v C 55v provides 6.5-11v bus for distributed power architectures ? fixed frequency switching provides predictable emi per- formance operational features operational features ? on/off control referenced to input side (positive and negative logic options available) contr contr ol features ol features ? industry standard eighth-brick bus converter pin-out ? industry standard size: 0.90 x 2.3 x .484 (22.9x58.4x11.76mm) ? total weight: 0.7 oz. (20 grams) ? flanged pins designed to permit surface mount solder- ing (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 abnormal input voltages ? output current limit and short circuit protection (auto recover y) ? output over-voltage protection ? thermal shutdown pr pr otection features otection features
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 2 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification pin no. name function 1 vin(+) input positive (35v - 55v) 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 (rohs 5/6) - tin/lead over nickel plate finish (rohs 6/6) - matte tin over nickel plate 5) unmeasured components are shown for visual reference only . 6) all dimensions in inches (mm) tolerances: x.xx 0.02 in. (x.x 0.5mm) x.xxx 0.010 in. (x.xx 0.25mm) 7) w eight: 0.7 oz. (20 g) typical 8) workmanship: meets or exceeds ipc-a-610c class ii 9) ul/tuv standards require a clearance of 0.04 (1.02mm) around primar y areas of the module. refer to section on keep out areas under application considerations for details. 10) the flanged pins are designed to per mit sur face mount soldering (allowing to avoid the wave soldering process) through the use of the flanged pin-in-paste technique. pin designa tions 0.300 (7.62) 0.600 (15.24) 0.900 (22.90) 0.140 ( 3.60) 0 .150 ( 3.80) 2 .300 ( 58.40) 2.000 (50.80) bottom side clearance see note 9 0.076 ?.028 (1.93 ?.71) 0.484 ?.020 (12.29 ?.50) flanged pin see note 10 load board lowest component 0.180 (4.57) see note 3 mechanical diagram top view side view
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 3 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-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 18 v input characteristics operating input voltage range 35 48 55 v input under-voltage lockout turn-on voltage threshold 34.3 v turn-off voltage threshold 32 v lockout voltage hysteresis 2.4 v input over-voltage shutdown turn-off voltage threshold 59.2 v turn-on voltage threshold 56.9 v maximum input current 5.8 a 100% load, 35 vin no-load input current 0.10 a disabled input current 15 30 ma inrush current transient rating 0.1 a 2 s input reflected ripple current 3.8 7.0 ma rms through 10 h inductor; figures 12 & 14 input terminal ripple current 250 ma rms, full load ; figures 13 recommended input fuse 20 a fast blow external fuse recommended input filter component values (l\c) 1.5\2.0 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 9.60 v 48v in, no load output v oltage regulation over line 40/3.8 %\v figure 4 over load 4.8/460 %\mv figure 4 over t emperature 2/200 %\mv figure 4 t otal output v oltage range 6.3 11.0 v over sample, line, load, temperature & life output v oltage ripple and noise 1 20mhz bandwidth; figure 12 & 15 peak-to-peak 100 120 mv full load; see figures 12 & 15 rms 20 40 mv full load; see figures 12 & 15 operating output current range 0 27 a subject to ther mal derating; figures 5 & 7 output dc current-limit inception 34 a output voltage 10% low; figure 16 output dc current-limit shutdown v oltage 0 v current share accuracy (3 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 9.6vout at 27a resistive load dynamic characteristics output voltage during load current transient for a step change in output current (0.1a/s) 150 mv 50% to 75% to 50% iout max; figure 11 settling time 200 s to within 1% vout nom turn-on transient turn-on time 1 ms full load, vout=90% nom.; figures 9 &10 start-up inhibit time 20 ms -40c to +125c output voltage overshoot 0 % 2,500 f load capacitance, iout = 0a efficiency 100% load 95.7 % figures 1 &3 50% load 96.1 % figures 1 &3 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 & 7 for derating curves isolation characteristics isolation voltage (dielectric strength) 2000 v isolation resistance 30 m w bq55090eta27 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: for applications requiring reduced output voltage ripple and noise, consult synqor applications suppor t (e-mail: suppor t@synqor .com )
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 4 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification parameter p min. typ. max. units notes & conditions f eature characteristics switching frequency 120 150 180 khz on/off control (option p) off-state voltage -1.0 0.8 v on-state voltage 2.4 18 v on/off control (option n) off-state voltage 2.4 18 v on-state voltage -1.0 0.8 v on/off control (either option) figures a & b pull-up voltage 9 v pull-up resistance 124 k w output over-voltage protection 11.6 v over full temp range; no load over-temperature shutdown 140 150 c average pcb temperature over-temperature shutdown restart hysteresis 10 c load current scale factor 1667 see app note: output load current calc. reliability characteristics calculated mtbf (t elcordia) 2.36 10 6 hrs. tr-nwt -000332; 80% load,300lfm, 40 o c t a calculated mtbf (mil-217) 1.79 10 6 hrs. mil-hdbk-217f; 80% load, 300lfm, 40 o c t a field demonstrated mtbf 10 6 hrs. see our website for values 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 3 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)
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 5 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification 70 75 80 85 90 95 100 0 3 6 9 12 15 18 21 24 27 l oad current (a) e f f i c i e n c y ( % ) 35 vin 48 vin 55 vin 0 12 3 4 5 6 7 8 9 10 11 12 13 14 0 3 6 9 12 15 18 21 24 27 load current (a) p o w e r d i s s i p a t i o n ( w ) 35 vin 48 vin 55 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 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). 4 5 6 78 9 10 11 12 0 5 10 15 20 25 load current (a) o u t p u t v o l t a g e ( v ) 35v 48v 55v 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 25 40 55 70 85 ambient air temperature ( o c) i o u t ( a ) 400 lfm 300 lfm 200 lfm 100 lfm figure 5: maximum output power derating cur ves vs. ambient air tem - perature for airflow rates of 100 lfm through 400 lfm with air flow- ing from pin 1 to pin 3 (nominal input voltage). figure 6: thermal plot of conver ter at 27 amp load cur r ent (250w) with 55 c air flowing at the rate of 200 lfm. air is flowing across the converter from pin 1 to pin 3 (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 # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 6 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification 0 5 1 0 15 20 2 5 25 40 55 70 85 ambient air temperature ( o c) i o u t ( a ) 400 lfm 300 lfm 200 lfm 100 lfm figure 7: maximum output power derating curves vs. ambient air tem- peratur e for airflow rates of 100 lfm thr ough 400 lfm with air flow - ing from output to input (nominal input voltage). figure 8: thermal plot of converter at 27 amp load current (250w) with 55 c air flowing at the rate of 200 lfm. air is flowing acr oss the converter from output to input (nominal input voltage). figure 9: turn-on transient at full load (resistive load) (1.0 ms/div). input voltage pre-applied. top trace: vout (2v/div). bottom trace: on/off input (1v/div). figure 10: turn-on transient at zero load (1.0 ms/div). top trace: vout (2v/div). bottom trace: on/off input (1v/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). 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 converter i s i c semiconductor junction temperature is within 1 c of surface temperature
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 7 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification 0 . 01 0.1 1 1 0 1 00 1 ,000 1 0,000 1 00,000 hz o u t p u t i m p e d a n c e ( o h m s ) 35 vin 48 vin 55 vin figure 18: magnitude of incremental output impedance (z out = v out /i out ) for minimum, nominal, and maximum input voltage at full rated power. 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 (500 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 (20ma/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 . 0 1 2 3 4 5 6 78 9 10 11 12 0 5 10 15 20 25 30 35 load current (a) o u t p u t v o l t a g e ( v ) 35v 48v 55v 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 - verter attempts to turn on into a 1 m w short circuit. top trace (5.0ms/div) is an expansion of the on-time portion of the bottom trace.
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 8 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1,000 10,000 100,000 hz f o r w a r d t r a n s m i s s i o n ( d b ) 35 vin 48 vin 55 vin figure 19: magnitude of incremental forward transmission (ft = v out /v in ) for minimum, nominal, and maximum input voltage at full rated power . -50 -40 -30 -20 -10 0 10 10 100 1,000 10,000 100,000 hz r e v e r s e t r a n s m i s s i o n ( d b ) 35 vin 48 vin 55 vin figure 20: magnitude of incr emental r everse transmission (rt = i in /i out ) for minimum, nominal, and maximum input voltage at full rated power. 0.1 1 10 100 1000 10000 10 100 1,000 10,000 100,000 hz i n p u t i m p e d a n c e ( o h m s ) 35 vin 48 vin 55 vin figure 21: magnitude of incremental input impedance (z in = v in /i in ) for minimum, nominal, and maximum input voltage at full rated power.
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 9 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-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 many applications requiring multiple low voltage outputs, 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 efficient for the bus conver ter and provide lower board level distribution current. lower bus voltages offer the opposite trade offs. synqor s 9.6v out bus qor module acts as a true dc transfor mer . the output voltage is propor tional to the input voltage, with a specified tur ns ratio or voltage ratio, plus minor drop from the internal resistive losses in the module. when used in iba systems, 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 ref- erenced 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 turns the converter on ). in the negative logic version, the on/off signal is active low (meaning that a low tur ns the conver ter on ). figure b is a detailed look of the inter nal on/off circuitry. 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. the lockout circuitry is a comparator with dc hysteresis. when the input voltage is ris- ing, it must exceed the typical turn-on voltage threshold value (listed on the specification page ) before the converter will turn on. once the converter is on, the input voltage must fall below the typ- ical turn-off voltage threshold value before the converter will turn off. also see figure e . figure a: example of intermediate bus architecture using busqor bus conver ter and point of load 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 point of load converters 48vdc 35-55v 9.6vdc figure b: internal on/off pin cir cuitry vin+ ttl 100k 5v on/off 124k vin- 49.9k
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 10 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification output current limit : the output of the bus qor module is elec- tronically protected against output overloads. when an overload current greater than the dc current-limit inception specification is drawn from the output, the output shuts down to zero volt in a period of 10ms 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 volt- age will go through repeated cycles of shutdown and restart with a duty cycle of 3% (on) and 97% (off) respectively. the bus qor module returns (auto resetting) to normal operation once the over- load 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 34a will flow into the short circuit for a period of about 10ms. the output of the bus qor will shutdown to zero volts for the same period (figure e ). 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 3% (on) and 97% (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 indefinitely with- out 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 copper traces and pads from the output circuit be designed to withstand the short term peaks, although the average current into the fault may be as low as 2a typical. see figure 17 for appropriate waveform. over-temperature shutdown : a temperature sensor on the converter 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. application considerations start-up inhibit period : figure e details the start-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 thresh - old, the unit is disabled by the input under-voltage lockout fea- ture. when the input voltage rises above the uvl threshold, the input under -voltage lockout is released, and a typical startup inhibit period of 3ms is initiated. the output builds up to 90% or higher of the nominal voltage and stabilizes at the nominal value of 9.6v. the rise time from 0v to 90% is 4.5ms 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 9.6v 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 2.5ms 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 voltage 9.6v 34a 27a 10ms 0v figure c: output overload pr otection diagram (not to scale) output current output voltage 9.6v 70a 250ms 10ms 0v figure d: output short circuit and auto-resetting protection diagram (not to scale) t ime t ime
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 11 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-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 par ts below the bus qor module, one should be aware of potential high levels of electro - magnetic inter ference, in addition to safety keep out. users are advised to consult synqor applications engineering in such appli - cations. copper keep out area : keep out areas shown in figure f are to be observed for top layer copper traces and vias. internal layers 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 surface (creepage) may vary depending on the pcb material cti. users are advised to consult ul standards for details. bridging components : bridging components like emi filter capac- itors required to be placed as close as possible to the bus qor module for optimum per for mance must obser ve the clearance/creepage requirements of 0.04"(40 mils) between pads to maintain compliance to ul standards for the overall power system. note : referenced keep out widths are adequate to withstand ul's basic insulation dielectric strength tests for approved pcb materi- als. 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 cur- rent loop or exter nal shunt resistor to the designer s pcb board under test. on the top side of the bus qor converter is a current sense resistor as shown in figure g . the output load current is propor tional 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(full load) - v rsense(no load) ) * 1667 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 conver ter at zero load the number 1667 is a load current scale factor for this product, valid only for vin = 48v. hence, measurement should be made at this input voltage. the voltage drop across the sense resistor is about 16.2mv at full load of 27a. therefore, proper measuring techniques must figure f: keep out areas for busqor module figure e: power up/down diagram (not to scale) showing s tar t-up inhibit period. vin vout 9.6v on/off ( n logic) uvlo off 3ms 2.5ms 7ms on t 0 t 1 t 2 t 3 t 0.010
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 12 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification 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 synqors website titled output load current calculations. input capacitor: w e recommend a suitable aluminum elec - trolytic capacitor across the input ter minals of the conver ter, to decouple source inductance and provide damping for the input circuit to avoid input instability. the capacitor must have a ripple current rating consistent with the "input terminal ripple current" specification of the converter in order to avoid premature failure of the capacitor. the examples below are of the recommended type and have ripple current ratings above the converter's input terminal ripple current rating, to provide design margin and extend the lifetime of the capacitor. 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 recom- mended but are considered optional. input capacitors must be located close to the conver ter module. pcb layout in the input cir- cuit should be such that high frequency ripple currents of each module is restricted to a loop formed by the input capacitors and the input ter minals of the bus qor module. see figure j for details on pcb layout. contact synqor application engineering for fur - ther assistance on pcb trace design. the current share per for mance of two paralleled modules is illus - trated in the graph in figure k. in this graph the percent deviation from ideal sharing (50%) is plotted for each module versus the total output load current at 48vin. 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 com - pliant (product with lead) or 6/6 rohs compliant. for more infor - mation please refer to synqor s rohs addendum available at our rohs compliance / lead free initiative web page or e-mail us at rohs@synqor .com . figure h: busqor output paralleling for increased current output. figure g: location of sense resistors vin 9.6vout 54a 1 2 3 1 2 3 5 4 5 4 bus qor module (n logic option) b us qor module ( n logic option) figure k: cur rent share performance of 2 paralleled modules figure j: recommended pcb layout for input circuit -8% -6% -4% -2% 0% 2% 4% 6% 8% 5 10152025303540455054 t o t al 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 ( % ) unit 1 unit 2 48vin cm emi filter bulk cap input lc filters bus qor module bus qor module (not shown in figure h) vendor part number description panasonic eeufc2a560 56uf, 100v, 460ma rms ripple current rating at 105c, 10x20mm (dia x height) p ackage nichicon upj2a470mhd 47uf , 100v, 402ma rms ripple current rating at 105c, 12x15mm package (lower height) panasonic eeufc1j470 47uf, 63v, 405 ma rms, 8x12 mm package
pr oduct # bq55090et a27 phone 1-888-567-9596 www .synqor .com doc.# 005-2be559c rev. c 03/10/10 page 13 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 9.6 v 9.6 v 27 a 27 a eighth-brick eighth-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. output max output voltage current bq55090eta27 xyz 35 - 55 v 9.6 v 27 a model number input voltage enable pin feature logic length set p - positive n - negative * k - 0.110" n - 0.145" r - 0.180" y - 0.250" s - standard options description: x y z * consult the factory before ordering the p logic option bq 55 090 e t a 27 n n s product family package size performance level thermal design output current options (see ordering information) input voltage output voltage 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 p atents synqor holds the following u.s. patents, one or more of which apply to each product listed in this brochure. 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 7,1 19,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702

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