View BQ55120ETA20NNS_7674357.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

t t echnical echnical s s pecification pecification bq55120et bq55120et a20 a20 pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 1 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 1 1 2 2 0 0 e e t t a a 2 2 0 0 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 3 3 5 5 - - 5 5 5 5 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 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 ) ) . . bq55120eta20 module bus bus conver conver ter ter 35-55v 35-55v 12v 12v 240w 240w att att 2000vdc 2000vdc eighth-brick eighth-brick input input output output power power isolation isolation dc bus conver dc bus conver ter ter ? ultra-high efficiency, >95.5% at full rated load current ? delivers up to 20 amps of output current (240w) with minimal derating - no heatsink required ? input voltage range: 35v C 55v provides 12v 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 (22.9x58.4mm) ? total height only 0.320 (8.13mm), permits better air- flow and smaller card pitch ? 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 recognized (us & canada), basic insu- lation rating ? tuv certified to en60950 ? 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 ? thermal shutdown pr pr otection features otection features * final datasheet pending eco review and signature.
pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 2 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) 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 - matte tin over nickel plate 5) undimensioned 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) weight: 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 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 (avoiding the wave soldering process) through the use of the flanged pin-in-paste technique. pin designations mechanical diagram 0.300 (7.62) 0.90 (22.9) 0.15 (3.8) 0.600 (15.24) 0.14 (3.6) 2.30 (58.4) 2.00 (50.8) top view flanged pin see note 10 side view load board bottom side clearance see note 9 lowest component 0.025 + 0.013 (0.64 + 0.33) 0.320 + 0.015 (8.13 + 0.38) overall height 0.145 (3.68) see note 3 1 2 3 4 5
pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 3 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) 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 32.0 v turn-off voltage threshold 30.5 v lockout voltage hysteresis 1.5 v input over-voltage shutdown turn-off voltage threshold 59.0 v turn-on voltage threshold 58.0 v maximum input current 5.5 a 100% load, 35vin no-load input current 0.1 a disabled input current 7 15 ma inrush current transient rating 0.1 a 2 s input reflected ripple current 10 ma rms through 10 h inductor; figures 12 & 14 input terminal ripple current 50 100 ma rms, full load ; figures 12 & 13 recommended input fuse 12 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 voltage set point 12.00 v 48vin, no load output voltage regulation over line + 20 \ 2.4 %\v figure 4 over load + 4.1 \ 500 %\mv figure 4 over temperature + 1.7 \ 200 %\mv figure 4 total output voltage range 8.0 13.8 v over sample, line, load, temperature & life output voltage ripple and noise 1 20mhz bandwidth; figures 12 & 15 peak-to-peak 100 150 mv full load, see figures 12 & 15 rms 20 40 mv full load, see figures 12 & 15 operating output current range 0 20 a subject to thermal derating; figures 5 - 8 output dc current-limit inception 27 a output voltage 10% low; figure 16 output dc current-limit shutdown voltage vin / 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 20a resistive load dynamic characteristics output voltage during load current t ransient for a step change in output current (0.1a/s) 200 mv 50% to 75% to 50% iout max; figure 11 settling t ime 200 s to within 1% vout nom t ur n-on transient t ur n-on time 9 ms full load, vout=90% nom.; figures 9 & 10 star t-up inhibit t ime 3 ms -40c to +125c output voltage overshoot 0 % 2,500 f load capacitance, iout = 0a efficiency 100% load 95.5 % figures 1 - 3 50% load 96.0 % figures 1 - 3 tempera ture 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 isola tion characteristics isolation voltage (dielectric strength) 2000 v isolation resistance 30 m w bq55120eta20 electrical characteristics t a =25c, airflow rate=300 lfm, v in =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 support (e-mail: suppor t@synqor .com ).
pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 4 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) eighth-brick eighth-brick t t echnical s echnical s pecification pecification parameter min. typ. max. units notes & conditions f eature characteristics switching frequency 165 190 215 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 10 v pull-up resistance 30 k w over-temperature shutdown 140 150 c average pcb temperature over-temperature shutdown restart hysteresis 10 c load current scale factor 1333 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 details standards compliance parameter p notes standards compliance ul/cul 60950 file # e194341, basic insulation & pollution degree 2 en60950 cer tified by tuv 72/23/eec 93/68/eec needle flame test (iec 695-2-2) test on entire assembly; board & plastic components ul94v-0 compliant iec 61000-4-2 esd test, 8kv - np, 15kv air - np (nor mal per formance) 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 . qualification testing parameter p # units test conditions qualification testing life test 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 temperature 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 factory for official product family qualification document. electrical characteristics (continued) options synqor provides various options for pin length and feature set for this family of power interface modules. please consult the last page for information on available options. pa tents synqor is protected under various patents. please consult the last page for further information.
pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 5 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) eighth-brick eighth-brick t t echnical s echnical s pecification pecification 70 75 80 85 90 95 100 0 4 8 12 16 20 load current (a) efficiency (%) 35 vin 48 vin 55 vin 0 1 2 3 4 5 6 7 8 9 10 11 0 4 8 12 16 20 load current (a) power dissipation (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. 93 94 95 96 97 100 200 300 400 air flow (lfm) efficiency (%) 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). 6 7 8 9 10 11 12 13 14 0 2 4 6 8 10 12 14 16 load current (a) output voltage (v) 35v 48v 55v figure 4: output voltage regulation vs. load current for minimum, nom- inal, and maximum input voltage at 25 c. 0 4 8 12 16 20 02 5 40 55 70 85 ambient air temperature (oc) iout (a) 400 lfm (2.0 m/s) 30 0 lfm (1.5 m/s) 2 00 lfm (1.0 m/s) 1 00 lfm (0.5 m/s) figure 5: maximum output power derating curves vs. ambient air tem - perature for airflow rates of 100 lfm through 400 lfm with air flow- ing from pin 3 to pin 1 (nominal input voltage). figure 6: thermal plot of converter at 20 amp load cur r ent (240w) 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 # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 6 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) eighth-brick eighth-brick t t echnical s echnical s pecification pecification 0 4 8 12 16 20 0 25 40 55 70 85 ambient air temperature (oc) iout (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) figure 7: maximum output power derating curves vs. ambient air tem- peratur e for airflow rates of 100 lfm through 400 lfm with air flow - ing from output to input (nominal input voltage). figure 8: thermal plot of converter at 20 amp load current (240w) with 55 c air flowing at the rate of 200 lfm. air is flowing across the converter from output to input (nominal input voltage). figure 9: turn-on transient at half load (resistive load) and 3mf output capacitance (2.0ms/div). input voltage pre-applied. channel 1: vout (2v/div). channel 2: on/off input (2v/div). figure 10: turn-on transient at zero load and 3mf output capacitance (2.0ms/div). input voltage pre-applied. channel 1: vout (2v/div). channel 2: on/off input (2v/div). figure 1 1 : output voltage response to step-change in load current (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 : t est set-up diagram showing measurement points for input terminal ripple current (figure 13 ), input reflected ripple current (figure 14 ) and output voltage ripple (figure 15 ). 10 h source impedance dc/dc converter 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 semiconductor junction temperature is within 1 c of surface temperature
0 .01 0.1 1 10 1 00 1 ,000 1 0,000 1 00,000 hz output impedance (ohms) 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. pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 7 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) eighth-brick eighth-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 source impedance and 47 f electrolytic capacitor (50 ma [200mv]/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 (5ma [10mv]/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 2 4 6 8 10 12 14 0 5 10 15 20 25 30 load current (a) output voltage (v) 35v 48v 55v figure 16: output voltage vs. load current showing typical current limit curves and converter shutdown points. figure 17: load curr ent (10a/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 # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 8 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) eighth-brick eighth-brick t t echnical s echnical s pecification pecification -40 -30 -20 -10 0 10 10 100 1,000 10,000 100,000 hz forward transmission (db) 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 . -40 -30 -20 -10 0 10 10 100 1,000 10,000 100,000 hz reverse transmission (db) 35 vin 48 vin 55 vin figure 20: magnitude of incremental reverse 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 input impedance (ohms) 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 # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 9 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) 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 an unregulated voltage step down in one compact module, leaving regulation to simpler, less expensive non-isolated con- verters. 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 points 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 converter and provide lower board level distrib - ution current. lower bus voltages offer the opposite trade offs. synqors 12vout bus qor module acts as a true dc transformer. the output voltage is proportional to the input voltage, with a specified turns ratio or voltage ratio, plus minor drop from the inter nal 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, allowing for multiple bus converters can be connected directly in parallel to allow cur- rent 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 turns the conver ter on). in the negative logic version, the on/off signal is active low (meaning that a low turns the converter on). figure b is a detailed look of the internal on/off circuitry. positive logic enabled modules have n-channel fet populated. negative logic enabled modules have p-channel fet populated. protection fea tures 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 circuitr y 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 specification page ) before the converter will turn on. once the converter is on, the input voltage must fall below the typical 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 converter 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 busqor converter niqor converters 48vdc 35-55v 12vdc figure b: internal on/off pin cir cuitry vin+ ttl 100k 5v on/off 124k vin- 49.9k
pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 10 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) eighth-brick eighth-brick t t echnical s echnical s pecification pecification output current limit : the output of the busqor 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 volts 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 voltage will go through repeated cycles of shutdown and restart with a duty cycle of 4% (on) and 96% (off) respectively. the bus qor module returns (auto resetting) to normal operation 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 42a will flow into the short circuit for a period of about 10ms. the out- put of the busqor 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 4% (on) and 96% (off) respectively. the bus qor module returns (auto recovery) 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 recovery 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 2a typical. see figure 17 for appropri- ate 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 turn the converter off when the temperature at the sensed location reaches the over - t emperature shutdown value. it will allow the converter 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 start-up inhibit period for the bus qor module. at time t 0 , when vin 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 3ms is initiated. the output builds up to 90% or higher of the nominal voltage and stabilizes at the nominal value of 12.0v. the rise time from 0v to 90% is 1.5ms typical. at time t 2 , when the on/off pin is de-asserted (disabled), the bus qor output instantly drops to 0v. fall time from 12.0v to 0v is dependent on output capacitance and any parasitic trace inductance 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 3ms 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 12v 27a 20a 10ms 0v figure c: output overload protection diagram (not to scale) output current output voltage 12v 42a peak 250ms 10ms 0v figure d: output short circuit and auto-resetting protection diagram (not to scale) time time
pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 11 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) 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 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 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 observe 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 mate- rials. 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 external shunt resistor to the designers 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(load) - v rsense(no load) ) x 1333 where: i load = output load current v rsense(load) = voltage across the sense resistor with conver ter under load v rsense(no load) = voltage across the sense resistor with converter at zero load the number 1333 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 15mv at a full load of 20a. therefore, proper measuring techniques must figure e: power up/down diagram (not to scale) showing s tart-up inhibit period. vin vout 12v on/off (n logic) uvlo off 3ms 3ms 4.5ms on t 0 t 1 t 2 t 3 t time figure f: keep out areas for busqor module 0.010
pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 12 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) 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 web site titled output load current calculations. current sharing : busqor modules are designed to operate in parallel without the use of any external current share circuitr y. 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 converter 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 terminals of the bus qor module. see figure k for details on pcb layout. contact synqor application engineering for fur- ther 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 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 6/6 rohs compliant. for more information 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. busqor module (n logic option) busqor module (n logic option) v in 12vout 40a 1 2 3 1 2 3 5 4 5 4 figure j: curr ent share performance of 2 paralleled modules figure k: recommended pcb layout for input circuit -5.0% -4.0% -3.0% -2.0% -1.0% 0.0% 1 .0% 2.0% 3.0% 4 .0% 5.0% 5 10 15 20 25 30 35 40 total load current (a) deviation from 50/50 sharing (%) module 1 m odule 2 48vin cm emi filter bulk cap input lc filters busqor module busqor module (not shown in figure h) figure g: location of sense resistors
pr oduct # bq55120et a20 phone 1-888-567-9596 www .synqor .com doc.# 005-2be553b rev. a 4/18/07 page 13 input: input: output: output: current: current: p p ackage: ackage: 35-55 v 35-55 v 12 v 12 v 20 a 20 a (240w) (240w) eighth-brick eighth-brick t t echnical s echnical s pecification pecification part numbering system the part numbering system for synqors busqor dc bus con- verters follows the format shown in the example below. the first 12 characters comprise the base part 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 par t numbers are more likely to be readily available in stock for evaluation and prototype quantities. a -g suffix indi - cates the product is 6/6 rohs compliant. pa tents (additional patent applications may be filed) synqor holds the following patents, one or more of which might apply to this product: 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 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. a -g suffix indicates the product is 6/6 rohs compliant. the following option choices must be included in place of the x y z spaces in the model numbers listed above. application notes a variety of application notes and technical white papers can be downloaded in pdf format from our website . 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 further 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 bq55120eta20 xyz -g 35 - 55 v 12 v 20 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 * consult the factory before ordering the p logic option options description: x y z bq 55 120 e t a 20 n n s - g product family package size performance level thermal design output current 6/6 rohs options (see ordering information) input voltage output v oltage

▲Up To Search▲

Price & Availability of BQ55120ETA20NNS

	To Download BQ55120ETA20NNS Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .