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t t echnical echnical s s pecification pecification pq24050qga20 pq24050qga20 pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 1 t t h h e e p p q q 2 2 4 4 0 0 5 5 0 0 q q g g a a 2 2 0 0 p p o o w w e e r r q q o o r r ? ? g g i i g g 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 . . 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 ) ) . . pq24050qga20 module 24v 24v in in 5v 5v out out 20amp 20amp 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, 87% at full rated load current ? delivers up to 20 amps of output current (100 watts) with minimal derating ? w ide input voltage range: 18v C 36v meets or exceeds all 24v bus standards ? fixed frequency switching provides predictable emi per - formance ? no minimum load requirement means no preload resis- tors required operational features operational features ? industry standard quarter-brick pin-out configuration ? industry standard size: 1.45 x 2.3 (36.8x58.4mm) ? t otal height less than 0.40 (10.2mm), permits better air flow and smaller card pitch ? total weight: 1.2 oz. (34 grams) ? flanged pins designed to permit surface mount solder- ing (to 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 per mits custom voltages and voltage margining contr contr ol features ol features ? input under-voltage lockout disables converter at low input voltage conditions ? output current limit and short circuit protection protects converter and load from damage ? active back bias limit prevents damage to converter from exter nal load induced pre-bias ? output over-voltage protection ? thermal shutdown pr pr otection features otection features ? 2000v, 30 m 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 ? nebs and etsi compliant safety features safety features
pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 2 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 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: 1.2 oz. (34 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- dering (allowing to avoid the wave soldering process) through the use of the flanged pin-in-paste technique. 0.300 (7.62) 0.600 (15.24) 1 .45 (36.8) 0.43 (10.9) 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 view pin designa tions mechanical diagram load board bottom side clearance see note 9 m ax. height lowest component 0.40 (10.2) 0.047+/-0.015 (1.19+/-0.38) 0.145 (3.68) see note 3 flanged pin see note 10
pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 3 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 a quarter-brick quarter-brick parameter min. typ. max. units notes & conditions absolute maximum ratings input voltage non-operating 50 v continuous operating 40 v continuous operating transient protection 50 v < 10 s, 1% duty cycle 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 18 24 36 v input under-voltage lockout turn-on voltage threshold 15.5 16 16.5 v turn-off voltage threshold 14.0 14.5 15.0 v lockout voltage hysteresis 1.0 1.5 2.0 v maximum input current 6.4 a 100% load, 18 vin no-load input current 100 200 ma disabled input current 1.6 3 ma inrush current transient rating 0.01 a 2 s input reflected ripple current 10 ma p-p thru 3.3 h inductor; figures 13 & 15 input terminal ripple current 200 ma rms ; figures 13 & 14 recommended input fuse 20 a fast blow external fuse recommended input filter component values (c\l) 4.5\1.5 f\h internal values; see figure e recommended external input capacitance 100 f typical esr 0.1-0.2 , see figure 13 output characteristics output voltage set point 4.95 5.00 5.05 v output voltage regulation over line + 0.05 \ 2 + 0.2 \ 10 %\mv over load + 0.05 \ 2 + 0.2 \ 10 %\mv over t emperature + 25 + 75 mv t otal output v oltage range 4.87 5.13 v over sample, line, load, temperature & life output v oltage ripple and noise 1 20mhz bandwidth; figures 13 & 16 peak-to-peak 25 50 mv full load; see figures 13 & 16 rms 6 12 mv full load; see figures 13 & 16 operating output current range 0 20 a subject to ther mal derating; figures 5 - 8 output dc current-limit inception 21 24 26 a output v oltage 10% low; figure 17 output dc current-limit shutdown v oltage 3.1 v back-drive current limit while enabled 0.3 0.65 1.5 a negative current drawn from output back-drive current limit while disabled 0 10 50 ma negative current drawn from output maximum output capacitance 6,000 f 5.0vout at 20a resistive load dynamic characteristics input voltage ripple rejection 66 db 120 hz; figure 20 output voltage during load current transient for a step change in output current (0.1a/s) 220 mv 50% to 75% to 50% iout max; figure 11 for a step change in output current (5a/s) 240 mv 50% to 75% to 50% iout max; figure 12 settling time 400 s to within 1% vout nom turn-on transient turn-on time 1 4 8 ms full load, vout=90% nom.; figures 9 & 10 start-up inhibit time 180 200 240 ms -40c to +125c; figure f output voltage overshoot 0 % 10,000 f load capacitance, iout = 0a efficiency 100% load 87 % figures 1 - 4 50% load 90 % 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 pq24050qga20 electrical characteristics t a =25c, airflow rate=300 lfm, v i n =24vdc 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 ) note 2: higher values of isolation capacitance can be added external to the module.
pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 4 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 a quarter-brick quarter-brick parameter p min. typ. max. units notes & conditions f eature characteristics buck stage switching frequency 280 300 320 khz isolation stage switching frequency 1 175 khz 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/3 9.6 v pull-up resistance 33 k output voltage trim range -20 +10 % measured across pins 8 & 4; figure 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 -t emperature shutdown restar t hysteresis 10 c load current scale factor 1000 reliability characteristics calculated mtbf (t elcordia) 2.8 10 6 hrs. tr-nwt - 000332; 80% load,300lfm, 40 o c t a calculated mtbf (mil-217) 1.8 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 1. the shape of the output voltage ripple wavefor m is effected by the fact that the isolation stage runs asynchronous to the input stage. 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 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 certificates on new releases or download from the synqor website . qualifica tion testing parameter p # units test conditions qualifica tion testing life t est 32 95% rated v in and load, units at derating point, 1000 hours v ibration 5 10-55hz sweep, 0.060 total excursion,1 min./sweep, 120 sweeps for 3 axis mechanical shock 5 100g minimum, 2 drops in x and y axis, 1 drop in z axis t emperature cycling 10 -40c to 100c, unit temp. ramp 15c/min., 500 cycles power/ther mal cycling 5 t operating = min to max, v in = min to max, full load, 100 cycles design marginality 5t min -10c to t max +10c, 5c steps, v in = min to max, 0-105% load humidity 5 85c, 85% rh, 1000 hours, 2 minutes on and 6 hours off solderability 15 pins mil-std-883, method 2003 ? extensive characterization testing of all synqor products and manufacturing processes is performed to ensure that we supply robust, reliable product. contact the factor y for official product family qualification documents. electrical characteristics (continued) options synqor provides various options for logic sense, pin length and feature set for this family of dc/dc converters. please consult the last page of this specification sheet for infor mation on available options. patents synqor is protected under various patents, including but not lim- ited to u.s. patent # 5,999,417.
pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 5 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 a quarter-brick quarter-brick 60 65 70 75 80 85 90 95 0 2 4 6 8 10 12 14 16 18 20 load current (a) e f f i c i e n c y ( % ) 18vin 24vin 36vin figure 1: efficiency at nominal output voltage vs. load current for min- imum, nominal, and maximum input voltage at 25 c. 82 83 84 85 86 87 88 89 90 0 100 200 300 400 500 air flow (lfm) e f f i c i e n c y ( % ) 25 c 40 c 55 c figure 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 6 8 10 12 14 16 18 0 2 4 6 8 10 12 14 16 18 20 load current (a) p o w e r d i s s i p a t i o n ( w ) 18vin 24vin 36vin figure 3: power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25 c. 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 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 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 2 4 68 10 12 14 16 18 20 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) 2 00 lfm (1.0 m/s) 1 00 lfm (0.5 m/s) 0 lfm (0 m/s) figure 5: maximum output power derating curves vs. ambient air tem- perature for airflow rates of 0 lfm through 400 lfm with air flowing fr om pin 1 to pin 3 (nominal input voltage). figure 6: thermal plot of converter at 14 amp load current (70w) with 55 c air flowing at the rate of 200 lfm. air is flowing across the con- ver ter fr om pin 1 to pin 3 (nominal input voltage). semiconductor junction temperature is within 1 c of surface temperature
pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 6 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 a quarter-brick quarter-brick 0 2 4 6 8 1 0 12 14 16 18 20 0 25 40 55 70 85 ambient air temperature ( o c) i o u t ( a ) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 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 input to output (nominal input voltage). figure 8: thermal plot of converter at 14 amp load current (70w) with 55 c air flowing at the rate of 200 lfm. air is flowing acr oss the con- verter from input to output (nominal input voltage). figure 9: t urn-on transient at full load (resistive load) (2 ms/div). input voltage pre-applied. ch 1: vout (2v/div). ch 2: on/off input (5v/div) figure 10: t urn-on transient at zero load (2 ms/div). ch 1: vout (2v/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 capac- itor and 1 f ceramic capacitor . ch 1: v out (200mv/div), ch 2: iout (10a/div). figure 12 : output voltage response to step-change in load current (50%-75%- 50% of iout(max): di/dt = 5a/ s). load cap: 470 f, 30 m esr tantalum capacitor and 1 f ceramic cap . ch 1: v out (200mv/div), ch 2: iout (10a/div). semiconductor junction temperature is within 1 c of surface temperature
pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 7 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 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 3.3 h sour ce impedance and 100 f electrolytic capacitor (500 ma/div). see figure 13. figure 15: input reflected ripple current, i s , through a 3.3 h source inductor at nominal input voltage and rated load current (20 ma/div). see figure 13. figure 16: output voltage ripple at nominal input voltage and rated load current (20 mv/div). load capacitance: 1 f ceramic capacitor and 10 f tantalum capacitor. bandwidth: 20 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). 0 1 2 34 5 6 78 02 .5 57 .5 1 0 1 2.5 1 5 1 7.5 2 0 2 2.5 2 5 l oad current ( a) o u t p u t v o l t a g e ( v ) 18 v 24 v 3 6 v figure 17: output voltage vs. load current showing typical current limit curves and converter shutdown points. figure 18: load current (20a/div) as a function of time when the con- verter attempts to turn on into a 10 m short circuit. bottom trace (2.5ms/div) is an expansion of the on-time portion of the top trace. 3.3 h source impedance dc/dc converter see fig. 15 see fig. 14 see fig. 16 1 f ceramic c apacitor 10 f, 100m esr t antalum capacitor 100 f, ? 0.33 esr e lectrolytic capacitor v source i s i c v out
pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 8 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 a quarter-brick quarter-brick 0 .001 0.01 0 .1 1 10 100 1,000 10,000 100,000 hz o u t p u t i m p e d a n c e ( ) 18 vin 2 4 vin 36 vin figure 19: magnitude of incremental output impedance (z out = v out /i out ) for minimum, nominal, and maximum input voltage at full rated power . -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 ) 1 8 vin 24 vin 36 vin figure 20: magnitude of incremental forward transmission (ft = v out /v in ) for minimum, nominal, and maximum input voltage at full rated power . -60 -50 -40 -30 -20 -10 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 ) 18 vin 24 vin 36 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 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 ( ) 18 vin 24 vin 36 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 # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 9 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 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 higher 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 100k v in( + ) on/off v in( _ ) 50k 100pf
pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 10 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 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 5.0vout 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-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 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 voltage, the converter turns off. the conver ter then enters a hiccup mode where it repeatedly tur ns on and off at a 5 hz (nominal) frequency with a 5% duty cycle until the shor t 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 amount of the over-temperature shutdown restart hysteresis value. r trim-up (k ) ) where v out = nominal output voltage = ( _ 511 _ 10.22 5.11v out ( 100+ ? % ) 1.225 ? % ? % 10 100 1,000 10,000 100,000 024681 0 1 2 1 4 1 6 1 8 2 0 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 # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 11 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 a quarter-brick quarter-brick 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 website which provides an understanding of why this instability arises, and shows the preferred solution for correcting 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 characteristics section on the electrical specifications page . 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 c 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 100f figure d: typical application circuit (negative logic unit, permanently enabled). figure e: internal input filter diagram (component values listed on specifications page ) .
pr oduct # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 12 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 a quarter-brick quarter-brick startup inhibit period: the startup inhibit period ensures that the converter will remain off for at least 200ms when it is shut down for any reason. when an output short is present, this gen- erates 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. rohs compliance: the eu led rohs (restriction of hazardous substances) directive bans the use of lead, cadmium, hexavalent chromium, mercury, polybrominated biphenyls (pbb), and polybrominated diphenyl ether (pbde) in electrical and electronic equipment. this product is available as 5/6 or 6/6 rohs compliant. for more information please visit our rohs compliance / lead free initiative web or e-mail us at rohs@synqor .com . under -voltage lockout t urn-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 # pq24050qga20 phone 1-888-567-9596 www .synqor .com doc.# 005-2qg250d rev. c 03/13/06 page 13 t t echnical s echnical s pecification pecification input: input: output: output: current: current: p p ackage: ackage: 18-36 v 18-36 v 5 v 5 v 20 a 20 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 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. 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 pq24018qga25 xyz 18 - 36 v 1.8 v 25 a pq24033qga25 xyz 18 - 36 v 3.3 v 25 a pq24050qga20 xyz 18 - 36 v 5.0 v 20 a pq24120qga08 xyz 18 - 36 v 12 v 8.3 a pq24150qga07 xyz 18 - 36 v 15 v 6.7 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 24 050 q g a 20 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

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