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t t echnical echnical s s pecification pecification pq60120qt pq60120qt a12 a12 pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 1 t t h h e e p p q q 6 6 0 0 1 1 2 2 0 0 q q t t a a 1 1 2 2 p p o o w w e e r r q q o o r r ? ? t t e e r r a a q q u u a a r r t t e e r r - - b b r r i i c c k k 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 . . a a l l l l o o f f t t h h e e p p o o w w e e r r a a n n d d c c o o n n t t r r o o l l c c o o m m p p o o n n e e n n t t s s a a r r e e m m o o u u n n t t e e d d t t o o t t h h e e m m u u l l t t i i - - l l a a y y e e r r p p c c b b s s u u b b s s t t r r a a t t e e w w i i t t h h h h i i g g h h - - y y i i e e l l d d s s u u r r f f a a c c e e m m o o u u n n t t t t e e c c h h n n o o l l o o g g y y . . s s i i n n c c e e t t h h e e p p o o w w e e r r q q o o r r c c o o n n v v e e r r t t e e r r h h a a s s n n o o e e x x p p l l i i c c i i t t t t h h e e r r m m a a l l i i n n t t e e r r f f a a c c e e s s , , i i t t i i s s e e x x t t r r e e m m e e l l y y r r e e l l i i a a b b l l e e . . t t h h e e t t e e r r a a s s e e r r i i e e s s o o f f f f e e r r s s t t h h e e m m a a x x i i m m u u m m u u s s e e - - a a b b l l e e o o u u t t p p u u t t c c u u r r r r e e n n t t f f o o r r a a n n y y 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 . . pq60120qta12 module 48v 48v in in 12v 12v out out 12amp 12amp 2000vdc 2000vdc quar quar ter-brick ter-brick input input output output current current isolation isolation dc/dc conver dc/dc conver ter ter ? ultra-high efficiency, 91% at full rated load current ? delivers up to 12 amps of output current (144w) with minimal derating - no heatsink required ? w ide input voltage range: 35v C 75v, with 100v 100ms input voltage transient capability ? fixed frequency switching provides predictable emi per- formance ? no minimum load requirement means no preload resis- tors required operational features operational features ? input under-voltage lockout disables converter at low input voltage conditions ? output current limit and short circuit protection protects conver ter and load from per manent damage and conse- quent hazardous conditions ? active back bias limit prevents damage to converter from external load induced pre-bias ? output over-voltage protection protects load from dam- aging voltages ? ther mal shutdown protects converter from abnormal environmental conditions pr pr otection features otection features ? 2000v, 30 m input-to-output isolation provides input/output ground separation ? ul/cul 60950 recognized (us & canada), basic insu- lation rating ? tuv certified to en60950 ? meets 72/23/eec and 93/68/eec directives which facilitates ce marking in users end product ? board and plastic components meet ul94v-0 flammabil- ity requirements safety features safety features ? industry standard quarter-brick pin-out configuration ? industry standard size: 1.45 x 2.3 (36.8x58.4mm) ? total height less than 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 (avoid wave solder) using fpip technique mechanical features mechanical features ? on/off control referenced to input side (positive and negative logic options are available) ? remote sense for the output voltage compensates for output distribution drops ? output voltage trim permits custom voltages and voltage margining contr contr ol features ol features
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 2 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick pin no. name function 1 vin(+) positive input voltage 2 on/off ttl input to turn converter on and off, referenced to vin(-), with internal pull up. 3 vin(-) negative input voltage 4 vout(-) negative output voltage 5 sense(-) negative remote sense 1 6 trim output voltage trim 2 7 sense(+) positive remote sense 3 8 vout(+) positive output voltage notes: 1. sense(-) may be connected to vout(-) or left open. 2. leave trim pin open for nominal output voltage. 3. sense(+) may be connected to v out(+) or left open. notes 1) pins 1-3, 5-7 are 0.040 (1.02mm) diameter with 0.080 (2.03 mm) diameter standoff shoulders. 2) pins 4 and 8 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 - 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) workmanship: meets or exceeds ipc-a-610c class ii 9) ul/tuv standards require a clearance greater than 0.04 (1.02mm) between input and output for basic insulation. this issue should be considered if any copper traces are on the top side of the user s board. note that the ferrite cores are considered part of the input/primary circuit. 10) the flanged pins are designed to permit surface mount sol- deing (avoiding 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 (10.9) 0.150 (3.81) 0.300 (7.62) 0 .450 (11.43) 0.600 (15.24) 0.14 (3.6) 2 .30 (58.4) 2.00 (50.8) top view side v iew pin designa tions mechanical diagram load board b ottom side clearance see note 9 lowest component 0.43 (10.9) 0.060+.022/-.032 (1.52+.56/-.81) 0.145 (3.68) see note 3 flanged pin see note 10
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 3 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick parameter min. typ. max. units notes & conditions absolute maximum ratings input voltage non-operating 100 v continuous operating 80 v continuous operating transient protection 100 v 100 ms transient, square wave 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 i nput characteristics operating input voltage range 35 48 75 v input under-voltage lockout turn-on voltage threshold 32 33 34 v turn-off voltage threshold 28.5 29.5 30.5 v lockout voltage hysteresis 2.5 3.5 4.5 v maximum input current 5.1 a 100% load, 35 vin no-load input current 80 120 ma disabled input current 1.6 3 ma inrush current transient rating 0.01 a 2 s response to input transient 500 mv 1000v/ms input transient input reflected ripple current 5 ma p-p thru 10 h inductor; figures 13 & 15 input terminal ripple current 170 ma rms ; figures 13 & 14 recommended input fuse 7 a fast blow external fuse recommended input filter component values (l\c) 3.3\6.6 h\f internal values, see figure e recommended external input capacitance 47 f typical esr 0.1-0.2 , see figure 13 output characteristics output voltage set point 11.82 12.00 12.18 v output v oltage regulation over line + 0.05 \ 5 + 0.2 \ 24 %\mv over load + 0.05 \ 5 + 0.2 \ 24 %\mv over t emperature + 90 + 240 mv t otal output v oltage range 11.58 12.42 v over sample, line, load, temperature & life output v oltage ripple and noise 1 500mhz bandwidth; figures 13 & 16 peak-to-peak 75 150 mv full load, see figures 13 & 16 rms 15 30 mv full load, see figures 13 & 16 operating output current range 0 12.0 a subject to ther mal derating; figures 5-8 output dc current-limit inception 14.0 a output v oltage 10% low output dc current-limit shutdown v oltage 7.0 v back-drive current limit while enabled 0.1 0.3 0.8 a negative current drawn from output back-drive current limit while disabled 0 10 50 ma negative current drawn from output maximum output capacitance 6.0 mf 12vout at 12.0a resistive load dynamic characteristics input voltage ripple rejection 55 db 120 hz; figure 20 output voltage during load current transient for a step change in output current (0.1a/s) 600 mv 50% to 75% to 50% iout max; figure 11 for a step change in output current (1a/s) 250 mv 50% to 75% to 50% iout max; figure 12 settling time 500 s to within 1% vout nom turn-on transient turn-on time 7 10 14 ms full load, vout=90% nom.; figures 9 & 10 start-up inhibit time 200 220 240 ms -40c to +125c; figure f output voltage overshoot 5 % 6 mf load capacitance, iout = 0a efficiency 100% load 91 % figures 1 - 4 50% load 91 % figures 1 - 4 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) 2000 v isolation resistance 30 m isolation capacitance 2 470 pf pq60120qta12 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 temperature 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: support@synqor.com) note 2: higher values of isolation capacitance can be added external to the module.
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 4 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick parameter p min. typ. max. units notes & conditions f eature characteristics switching frequency 200 240 280 khz regulation and isolation stage on/off control (option p) off-state voltage -2 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 -2 0.8 v on/off control (either option) figures a, b pull-up voltage vin/6.5 9.2 v pull-up resistance 40 k output voltage trim range -20 +10 % measured across pins 8 & 4; figures 23& c output voltage remote sense range +10 % measured across pins 8 & 4 output over-voltage protection 117 122 127 % over full temp range; % of nominal vout over-temperature shutdown 125 c average pcb temperature over-temperature shutdown restart hysteresis 10 c load current scale factor 500 see app note: output load current calc. reliability characteristics calculated mtbf (t elcordia) 2.1 10 6 hrs. tr-nwt -000332; 80% load,300lfm, 40 o c t a calculated mtbf (mil-217) 1.75 10 6 hrs. mil-hdbk-217f; 80% load, 300lfm, 40 o c t a field demonstrated mtbf 10 6 hrs. see website for latest values parameter p notes standards compliance ul/cul 60950 file # e194341, basic insulation & pollution degree 2 en60950 certified 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 (normal performance) gr-1089-core section 7 - electrical safety, section 9 - bonding/grounding telcordia (bellcore) gr-513 ? an exter nal input fuse must always be used to meet these safety requirements. contact synqor for official safety certificates on new releases or download from the synqor website. parameter p # units test conditions qualification testing life test 32 95% rated v in and load, units at derating point, 1000 hours vibration 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/thermal cycling 5 t operating = min to max, v in = min to max, full load, 100 cycles design marginality 5 t 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 factory for official product family qualification document. 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, including but not lim- ited to u.s. patent #s 5,999,417; 6,222,742 b1; 6,594,159 b2; 6,545,890 b2. standards compliance qualifica tion testing
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 5 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick 88 89 90 91 92 93 94 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 3 45 6 7 89 0 100 200 300 400 500 air flow (lfm) p o w e r d i s s i p a t i o n ( w ) 25 c 40 c 55 c 6 5 70 758 0 85 90 95 1 00 0.0 1.2 2.4 3.6 4.8 6.0 7.2 8.4 9.6 10.8 12.0 load current (a) e f f i c i e n c y ( % ) 35 vin 48 vin 75 vin figure 1: efficiency at nominal output voltage vs. load current for min- imum, nominal, and maximum input voltage at 25 c. figure 2: efficiency at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatur es of 25 c, 40 c, and 55 c (nominal input voltage). 0 2 4 68 10 1 2 14 16 02571012 load current (a) p o w e r d i s s i p a t i o n ( w ) 35 vin 48 vin 75 vin figure 3: power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25 c. figure 4: power dissipation 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). 0 1 2 3 4 56 7 8 9 10 11 12 02 5 4 0 5 5 7 0 8 5 a mbient 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) 1 00 lfm (0.5 m/s) 0 lfm (0 m/s) figure 5: maximum output power derating cur ves vs. ambient air tem - perature for airflow rates of 0 lfm through 400 lfm with air flowing across the converter from input to output (nominal input voltage). figure 6 : thermal plot of conver ter at 1 1.2 amp load cur r ent (134w) with 55 c air flowing at the rate of 200 lfm. air is flowing across the converter from input to output (nominal input voltage). semiconductor junction temperature is within 1 c of sur face temperature
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 6 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick 0 1 2 3 4 56 7 8 9 1 0 11 12 0 25 40 55 70 85 ambient air temperature ( o c) i o u t ( a ) 4 00 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 0 lfm (0 m/s) figure 7: maximum output power derating curves vs. ambient air tem- peratur e for airflow rates of 0 lfm thr ough 400 lfm with air flowing from pin 1 to pin 3 (nominal input voltage). figure 8: thermal plot of converter at 11.6 amp load current (139w) with 55 c air flowing at the rate of 200 lfm. air is flowing fr om pin 1 to pin 3 (nominal input voltage). figure 9: t urn-on transient at full rated load (resistive load) (10 ms/div) input voltage pre-applied. ch 1: vout (5v/div). ch 2: on/off input (5v/div) figure 10: t urn-on transient at zero load current (10 ms/div). ch 1: vout (5v/div) ch 2: on/off input (5v/div) figure 11 : output voltage response to step-change in load current (50%-75%- 50% of iout(max); di/dt = 0.1a/ s). load cap: 10 f, 100 m esr tantalum capacitor and 1 f ceramic capacitor . ch 1: v out (500mv/div), ch 2: iout (5a/div). figure 12 : output voltage r esponse to step-change in load cur r ent (50%-75%- 50% of iout(max): di/dt = 1a/ s). load cap: 470 f, 30 m esr tantalum capacitor and 1 f ceramic cap. ch 1: vout (500mv/div), ch 2: iout (5a/div). semiconductor junction temperature is w ithin 1 c of surface temperature
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 7 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick figure 14: 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 (200 ma/div). see figure 13. figure 15: input reflected ripple current, i s , through a 10 h source inductor at nominal input voltage and rated load current (5 ma/div). see figure 13. figure 16: output voltage ripple at nominal input voltage and rated load current (50 mv/div). load capacitance: 1 f ceramic capacitor and 10 f tantalum capacitor. bandwidth: 500 mhz. see figure 13. figure 13: test set-up diagram showing measurement points for input t erminal ripple cur r ent (figur e 14), input reflected ripple current (figure 15) and output voltage ripple (figure 16). 10 h s ource impedance dc/dc converter see fig. 15 see fig. 14 see fig. 16 1 f ceramic capacitor 10 f, 100m esr tantalum c apacitor 47 f, ? 1 esr electrolytic c apacitor v source i s i c v out 0 2 4 6 8 10 12 14 024681 0 1 2 1 4 1 6 l oad current ( a) o u t p u t v o l t a g e ( v ) 35 v 48 v 7 5 v figure 17: output voltage vs. load current showing typical current limit curves and converter shutdown points. figure 18: load current (5a/div) as a function of time when the con- verter attempts to turn on into a 1 m short circuit. top trace (2ms/div) is an expansion of the on-time portion of the bottom trace.
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 8 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick 0.0001 0.001 0.01 0.1 1 10 100 1,000 10,000 100,000 1,000,000 hz o u t p u t i m p e d a n c e ( ) 35 vin 48 vin 75 vin figure 19: magntiude of incremental output impedance (z out = v out /i out ) for minimum, nominal, and maximum input voltage at full rated power . -100 -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 75 vin figure 20: magnitude of incremental forward transmission (ft = v out /v in ) for minimum, nominal, and maximum input voltage at full rated power . -45 -40 -35 -30 -25 -20 -15 -10 -5 0 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 75 vin figure 21: magnitude of incremental reverse transmission (rt = i in /i out ) for minimum, nominal, and maximum input voltage at full rated power. 0 1 2 3 45 6 78 9 10 4 0.0 3 9.5 3 9.0 3 8.5 3 8.0 3 7.5 3 7.0 3 6.5 3 6.0 3 5.5 3 5.0 i nput voltage (v) v o u t t r i m - u p ( % ) 100% load 5 0% load 0 % l o a d figure 23: percentage of output voltage trim-up that can be achieved at various input voltages from 35v-40v and output loads of 0%, 50% and full load. 0.1 1 10 100 10 100 1,000 10,000 100,000 hz i n p u t i m p e d a n c e ( ) 35 vin 48 vin 75 vin figure 22: magnitude of incremental input impedance (z in = v in /i in ) for minimum, nominal, and maximum input voltage at full rated power.
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 9 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick basic operation and features the power qor series converter uses a two-stage power conver- sion topology. the first stage is a buck-converter that keeps the output voltage constant over variations in line, load, and temper- ature. the second stage uses a transformer to provide the func- tions of input/output isolation and voltage step-down to achieve the low output voltage required. both the first stage and the second stage switch at a fixed fre- quency for predictable emi performance. rectification of the transformers output is accomplished with synchronous rectifiers. these devices, which are mosfets with a very low on-state resis- tance, dissipate far less energy than schottky diodes. this is the primary reason that the power qor converter has such high effi- ciency, even at very low output voltages and very high output cur- rents. dissipation throughout the converter is so low that it does not require a heatsink for operation. since a heatsink is not required, the power qor conver ter does not need a metal baseplate or pot - ting material to help conduct the dissipated energy to the heatsink. the power qor conver ter can thus be built more simply and reliably using high yield sur face mount techniques on a pcb substrate. the power qor series of half-brick and quar ter -brick conver ters uses the industr y standard footprint and pin-out configuration. 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 converter on ). in the negative logic version, the on/off signal is active low (meaning that a low turns the converter on ). figure a details five possible circuits for driving the on/off pin. figure b is a detailed look of the inter- nal on/off circuitry. remote sense(+ ) (pins 7 and 5) : the sense(+ ) inputs cor- rect for voltage drops along the conductors that connect the con - ver ter s output pins to the load. pin 7 should be connected to vout(+) and pin 5 should be con- nected to vout(-) at the point on the board where regulation is desired. a remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, that is [ vout(+) - vout(-) ] C [v sense(+) - v sense(-) ] < sense range % x v out pins 7 and 5 must be connected for proper regulation of the out - put voltage. if these connections are not made, the conver ter will deliver an output voltage that is slightly lower than its specified value. note : the output over -voltage protection circuit senses the voltage open collector enable circuit figure a: various circuits for driving the on/off pin. figure b: internal on/off pin circuitry remote enable circuit direct logic drive negative logic (permanently enabled) positive logic (permanently enabled) on/off vin( _ ) on/off on/off v in( _ ) on/off 5v ttl/ cmos vin( _ ) on/off vin( _ ) vin( _ ) ttl 5v 50k 274k v in( + ) on/off v in( _ ) 50k 100pf
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 10 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick across the output (pins 8 and 4) to determine when it should trig- ger, not the voltage across the converters sense leads (pins 7 and 5). therefore, the resistive drop on the board should be small enough so that output ovp does not trigger, even during load transients. output voltage trim (pin 6) : the trim input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications. to decrease the output voltage, the user should connect a resistor between pin 6 and pin 5 (sense(-) input). for a desired decrease of the nominal output voltage, the value of the resistor should be r trim-down = ( 511 ) - 10.22 (k ) ? % where ?% = v nominal C v desired x 100% v nominal to increase the output voltage, the user should connect a resistor between pin 6 and pin 7 (sense(+) input). for a desired increase of the nominal output voltage, the value of the resistor should be figure c graphs the relationship between the trim resistor value and rtrim-up and rtrim-down, showing the total range the output voltage can be trimmed up or down. figure c: trim graph for 12.0vout module note : the trim feature does not affect the voltage at which the output over-voltage protection circuit is triggered. trimming the output voltage too high may cause the over-voltage protection cir- cuit to engage, particularly during transients. it is not necessary for the user to add capacitance at the trim pin. the node is internally bypassed to eliminate noise. total dc variation of vout: for the converter to meet its full specifications, the maximum variation of the dc value of vout, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range. protection features input under-v oltage lockout : the conver ter is designed to tur n 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 typical turn-off voltage threshold value before the converter will turn off. output current limit : the maximum current limit remains con- stant as the output voltage drops. however, once the impedance of the short across the output is small enough to make the output voltage drop below the specified output dc current-limit shutdown v oltage, the conver ter tur ns off. the conver ter then enters a hiccup mode where it repeatedly turns on and off at a 5 hz (nominal) frequency with a 5% duty cycle until the short circuit condition is removed. this prevents excessive heating of the converter or the load board. output over-voltage limit : if the voltage across the output pins exceeds the output over-voltage protection threshold, the converter will immediately stop switching. this prevents damage to the load circuit due to 1) excessive series resistance in output current path from converter output pins to sense point, 2) a release of a short-circuit condition, or 3) a release of a current limit condition. load capacitance determines exactly how high the output voltage will rise in response to these conditions. after 200 ms the converter will automatically restart. over-temperature shutdown : a temperature sensor on the converter senses the average temperature of the module. the thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the over- temperature shutdown value. it will allow the converter to turn on again when the temperature of the sensed location falls by the r trim-up (k ) ) where v out = nominal output v oltage = ( _ 511 _ 10.22 5.11v out ( 100+ ? % ) 1.225 ? % ? % 1 0 100 1,000 10,000 100,000 0 2 4 6 8 10 12 14 16 18 20 t r i m r e s i s t a n c e ( k o h m s ) % increase vout % decrease vout
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 11 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick amount of the over-temperature shutdown restart hysteresis value. application considerations input system instability: this condition can occur because any dc/dc converter appears incrementally as a negative resistance load. a detailed application note titled input system instability is available on the synqor web site (www.synqor.com) which provides an understanding of why this instability arises, and shows the preferred solution for cor- recting it. application circuits: figure d below provides a typical cir- cuit diagram which details the input filtering and voltage trim- ming. input filtering and external capacitance: figure e below provides a diagram showing the internal input filter components. this filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of an external elec- trolytic input capacitor. the recommended external input capac- itance is specified in the input characterisitcs section. more detailed information is available in the application note titled emi characteristics on the synqor website. v in external input filter trim v in( + ) i load c load l v out(+) r trim-up or r trim-down v sense(+) on/off v in( _ ) v in(+) v in( _ ) v out( _ ) v sense( _ ) electrolytic capacitor 47f figure d: typical application circuit (negative logic unit, permanently enabled). figure e: internal input filter diagram (component values listed on page 3) . c
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 12 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick startup inhibit period: the startup inhibit period ensures that the converter will remain off for approximately 200ms when it is shut down for any reason. when an output short is present, this generates a 5hz "hiccup mode," which prevents the converter from overheating. in all, there are seven ways that the converter can be shut down, initiating a startup inhibit period: ? input under-voltage lockout ? input over-voltage shutdown (not present in quarter-brick) ? output over-voltage protection ? over temperature shutdown ? current limit ? short circuit protection ? turned off by the on/off input figure f shows three turn-on scenarios, where a startup inhibit period is initiated at t 0 , t 1 , and t 2 : before time t 0 , 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 startup inhibit period is initiated. at the end of this delay, the on/off pin is evaluated, and since it is active, the unit turns on. at time t 1 , the unit is disabled by the on/off pin, and it cannot be enabled again until the startup inhibit period has elapsed. when the on/off pin goes high after t 2 , the startup inhibit period has elapsed, and the output turns on within the typical turn-on time. under -v oltage lockout t ur n-on threshold on/off (pos logic) figure f: startup inhibit period (turn-on time not to scale) v out v in 200ms 200ms 200ms (typical star t-up inhibit period) t 0 t 1 t 2 t 4ms (typical turn on time) on on on off off
pr oduct # pq60120qt a12 phone 1-888-567-9596 www .synqor .com doc.# 005-2qt612c rev. a 10/4/04 page 13 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 12 v 12 v 12 a 12 a quarter-brick quarter-brick part numbering system the part numbering system for synqors power qor dc/dc converters 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. application notes a variety of application notes and technical white papers can be downloaded in pdf format at www.synqor.com. 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. the following option choices must be included in place of the x y z spaces in the model numbers listed above. w arranty synqor offers a three (3) year limited warranty . complete warranty infor mation is listed on our web site or is available upon request from synqor . infor mation fur nished 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 par ties which may result from its use. no license is granted by implication or other wise 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 : sales@synqor.com w eb : www.synqor.com address : 155 swanson road boxborough, ma 01719 output max output voltage current pq60010qta40 xyz 35 - 75 v 1.0 v 40 a pq60012qta40 xyz 35 - 75 v 1.2 v 40 a pq60015qta40 xyz 35 - 75 v 1.5 v 40 a pq60018qta40 xyz 35 - 75 v 1.8 v 40 a pq60025qta40 xyz 35 - 75 v 2.5 v 40 a pq60033qta35 xyz 35 - 75 v 3.3 v 35 a pq60050qta30 xyz 35 - 75 v 5.0 v 30 a pq60120qta12 xyz 35 - 75 v 12 v 12 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 pq 60 120 q t a 12 n k s product family package size performance level thermal design output current options (see ordering information) input voltage output voltage

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