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technical specification pq60120qex25 product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 1 the pq60120qea25 powerqor ? exa quarter-brick converter is a next-generation, board-mountable, isolated, fixed switching frequency dc/dc converter. the exa series offers industry leading power density for standard isolated dc/dc converters with both a wide input range and a tightly regulated output. targeted for use in intermediate bus architectures, this module supplies an isolated step down voltage from 35-75v to 12v and provides more available power and higher efficiency than most competitive bus converters. this converter is available in open-frame and baseplated versions. rohs compliant (see page 13). 35-75v 12v 25amp 2250vdc quarter-brick input output current isolation dc/dc converter pq60120qea25 module ? 2250v i nput-to-output i solation ? ul 60950-1: 2003, basi c i nsulation ? can/csa-c22.2 no. 60950-1: 2003 ? en60950-1:2001 ? rohs compl iant (see page 13) safety features ? industry standard quarter-bri ck pin-out confi guration ? industry standard si ze: 1.45 x 2.3 (36.8x58.4mm) ? total hei ght l ess than 0.436 (11.06mm), permi ts better airflow and small er card pitch ? total wei ght: 1.5 oz. (42 grams) ? open frame uni ts have fl anged pins desi gned to permi t surface mount sol dering (avoi d wave sol der) usi ng fpip techni que mechanical features ? on/off control referenced to i nput si de (posi tive and negative l ogic opti ons are avail able) control features page no. mechanical diagram (open frame) . . . . . . . . . . . . . . . . . . . . . . . . . 2 mechanical diagram (base-pl ated) . . . . . . . . . . . . . . . . . . . . . . . . . 3 pq60120qea25 el ectrical characteri stics . . . . . . . . . . . . . . . . . . . . . 4-5 standards co mpliance q ualification testing . . . . . . . . . . . . . 5 pq60120qea25 fi gures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8 application sec tion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12 ordering info rmation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 contents ? input u nder-voltage l ockout d isables c onverter a t l ow input v oltage c onditions ? output c urrent l imit a nd s hort c ircuit p rotection p rotects converter a nd l oad f rom d amage a nd c onsequent h azardous conditions ? active b ack b ias l imit p rovides s mooth s tartup w ith external l oad i nduced p re-bias ? latching o utput o ver-voltage p rotection p rotects l oad from d amaging v oltages ? thermal s hutdown p rotects c onverter f rom a bnormal environmental c onditions protection features ? ultra-high effi ciency, > 96% at ful l rated l oad current, >96.5% at hal f rated l oad current ? delivers up to 25a of output current (300w) wi th mini mal derating - no heatsink requi red ? wide i nput vol tage range: 35v C 75v, wi th 100v 100ms input vol tage transient capabi lity ? fixed f requency s witching p rovides p redictable emi p erformance ? no m inimum l oad r equirement - n o p reload r esistors r equired ? wide output vol tage tri m range (-50% to + 5%) operational features
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 2 technical specification 0.300 (7.62) 0.600 (15.24) 0.43 (10.9) 0.150 (3.81) 0.300 (7.62) 0.450 (11.43) 0.600 (15.24) 0.14 (3.6) top view side view mechanical diagram (open frame) bottom side clearance see note 9 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 (rohs 5/6) - tin/lead over nickel plate finish (rohs 6/6) - 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: 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 users board. note that the ferrite cores are considered part of the input/ primary circuit. 10) the flanged pins are designed to permit surface mount soldering (allow - ing to avoid the wave soldering process) through the use of the flanged pin-in-paste technique. pin no. n ame f unction 1 v in(+) p ositive input voltage 2 o n/off t tl input to turn converter o n and off, referenced to v in( C ), with internal pull up. 3 v in( C ) n egative input voltage 4 v out( C ) n egative output voltage 5 s ense( C ) n egative remote sense 1 6 t rim o utput voltage trim 2 7 s ense(+) p ositive remote sense 3 8 v out(+) p ositive output voltage notes: 1. sense(C) should be connected to vout(C) either remotely or at the con - verter. 2. leave trim pin open for nominal output voltage. 3. sense(+) should be connected to vout(+) either remotely or at the con - verter. pin d esignations 2.30 (58.4) 2.00 (50.8) 0.025 +0.024 (0.64 +0.61) lowest component load board flanged pin see note 10 0.180 (4.57) see note 3 0.436 max (11.06) 1.45 (36.8)
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 3 technical specification top view side view mechanical diagram (base-plated) 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 (rohs 5/6) - tin/lead over nickel plate finish (rohs 6/6) - 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: 2.4 oz. (69 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 users board. note that the ferrite cores are consid - ered part of the input/primary circuit. 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 tech - nique. 11) m3 screws used to bolt units baseplate to other surfaces such as a heatsink must not exceed 0.100 (2.54mm) depth below the baseplate surface. 12) applied torque per screw should not exceed 6 in-lb (0.7 nm). pin no. n ame f unction 1 v in(+) p ositive input voltage 2 o n/off t tl input to turn converter o n and off, referenced to v in( C ), with internal pull up. 3 v in( C ) n egative input voltage 4 v out( C ) n egative output voltage 5 s ense( C ) n egative remote sense 1 6 t rim o utput voltage trim 2 7 s ense(+) p ositive remote sense 3 8 v out(+) p ositive output voltage notes: 1. sense(C) should be connected to vout(C) either remotely or at the con - verter. 2. leave trim pin open for nominal output voltage. 3. sense(+) should be connected to vout(+) either remotely or at the con - verter. pin d esignations 0.300 (7.62) 0.600 (15.24) 0.43 (10.9) 0.150 (3.81) 0.300 (7.62) 0.450 (11.43) 0.600 (15.24) 0.14 (3.6) 1 7 6 5 4 2 3 bottom side clearance see note 9 m3 threaded inserts 4 places see notes 11 & 12 2.30 (58.4) 2.00 (50.8) 0.025 +.024 (10.46 +0.60) lowest component load board flanged pin see note 10 0.180 (4.57) see note 3 0.499 max (12.67) 1.45 (36.8) 1.03 (26.2) 0.21 (5.3) 1.86 (47.2) 0.22 (5.6) 8
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 4 technical specification 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) 2250 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 75 v 100v transient for 100ms input under-voltage lockout turn-on voltage threshold 31.5 33.0 34.5 v turn-off voltage threshold 28.0 29.5 31.0 v lockout voltage hysteresis 2.5 3.5 4.5 v maximum input current 10 a 100% load, 35 vin, trimmed up 5% no-load input current 70 100 ma disabled input current 20 40 ma response to input transient 1.0 v 0.25v/ s input transient input reflected ripple current 5 10 ma rms thru 4.7 h inductor input terminal ripple current 60 ma rms recommended input fuse 15 a fast blow external fuse recommended input filter component values (l\c) 1.5/6 h\f internal values; see figure f (l in \c 2 ) recommended external input capacitance 100 f typical esr 0.1-0.2 w output characteristics output voltage set point 11.70 12.00 12.30 v output voltage regulation over line 1 +1.0\120 %\mv over load 1 +1.0\120 %\mv over temperature +90 +240 mv total output voltage range 11.58 12.42 v over sample, line, load, temperature & life output voltage ripple and noise 2 500mhz bandwidth peak-to-peak 50 100 mv full load rms 10 40 mv full load operating output current range 0 25 a subject to thermal derating output dc current-limit inception 27 32 37 a output voltage 10% low output dc current-limit shutdown voltage 3 5.0 v back-drive current limit while enabled 13 18 23 a negative current drawn from output source back-drive current limit while disabled 0 0.5 1 ma negative current drawn from output source maximum output capacitance 12 mf 12vout at 25a resistive load dynamic characteristics output voltage during load current transient for a step change in output c urrent (0.1a/s) 350 mv 50% to 75% to 50% iout max for a step change in output current (5a/s) 350 mv 50% to 75% to 50% iout max, 470 f load cap settling time 1 ms to within 1% vout nom turn-on transient turn-on time 24 27 30 ms full load, on/off to vout=90% nom. output voltage overshoot 2 % 12 mf load capacitance, iout = 0a efficiency 100% load 95.5 96.0 % figures 1 & 2 50% load 96.5 % figures 1 & 2 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 3 - 6 for derating curves isolation characteristics isolation voltage (dielectric strength) 2250 v isolation resistance 30 m w isolation capacitance 4 1000 pf pq60120qea25 electrical characteristics t a =25c, airflow rate=300 lfm, v in =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: line and load regulation is limited by duty cycle quantization and does not indicate a shift in the internal voltage reference. note 2: for applications requiring reduced output voltage ripple and noise, consult synqor applications support (e-mail: support@synqor.com). note 3: if the output voltage falls below the output dc current limit shutdown voltage for more than 50ms, then the unit will enter into hiccup mode, with a 500ms off-time. note 4: higher values of isolation capacitance can be added external to the module.
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 5 technical specification electrical characteristics (continued) parameter p min. typ. max. units notes & conditions feature characteristics switching frequency regulation stage 235.6 238.0 240.4 khz over sample, temp & life switching frequency isolation stage 117.8 119.0 120.2 khz over sample, temp & life on/off control (option p) off-state voltage -2 1.0 v on-state voltage 4.0 18 v on/off control (option n) off-state voltage 4.0 18 v on-state voltage -2 1.0 v on/off control (either option) figures a & b on/off control hysteresis 1.5 v pull-up voltage 4.75 5 5.25 v pull up resistance 10 k w output voltage trim range -50 +5 % measured across pins 8 & 4; see trim section output over-voltage protection 113 118 123 % over full temp range; % of nominal vout over-temperature shutdown 120 c average pcb temperature over-temperature shutdown restart hysteresis 10 c reliability characteristics calculated mtbf (telcordia) 2.7 10 6 hrs. tr-nwt-000332; 80% load,300lfm, 40 o c t a calculated mtbf (mil-217) 2.5 10 6 hrs. mil-hdbk-217f; 80% load, 300lfm, 40 o c t a field demonstrated mtbf 10 6 hrs. see website for details standards compliance parameter notes & conditions standards compliance dlf lqodlrq &1&6& 1r (1 1hhgoh )odph h (& h rq hqluh dhpeo erdug sodlf frpsrqhq frpsoldq (& (6 h n 1 n dlu 1 1rupdo huirupdqfh 1rh q hhuqdo lqs ih p dod eh hg r phh hh dih uhtluhphq &rqdf 6qru iru riilfldo dih fhulilfdh rq qh uhohdh ru grqordg iurp h 6qru helh qualification testing parameter p # units t est conditions qualification t esting 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 axes 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 the factory for official product family qualification documents.
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 6 technical specification 80 85 90 95 100 0 2.5 5 7.5 10 12.5 15 17.5 20 22.5 25 load current (a) efficiency (%) 35vin 48vin 75vin figure 1: efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25 c. figure 2: power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25 c. figure 3: maximum output power derating curves vs. ambient air tem - perature for airflow rates of 100 lfm through 400 lfm with air flow - ing across the converter from pin 1 to pin 3 (nominal input voltage). figure 4: thermal plot of converter at 24a load current (288w) with 55 c air flowing at the rate of 200 lfm. air is flowing across the con - verter sideways from pin 1 to pin 3 (nominal input voltage). 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 lengthwise from input to output (nominal input voltage). figure 6: thermal plot of converter at 23a load current (276w) with 55 c air flowing at the rate of 200 lfm. air is flowing across the con - verter from input to output (nominal input voltage). figures
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 7 technical specification figure 7: turn-on transient at full load (resistive load) (10 ms/div). ch 1: vout (5v/div) ch 2: on/off input (5v/div) figure 8: turn-on transient at zero load (10 ms/div). ch 1: vout (5v/div) ch 2: on/off input (5v/div) figure 9: output voltage response to step-change in load current (50%-75%- 50% of iout(max); di/dt = 0.1a/ s). load cap: 1uf ceramic and 10uf tanta - lum capacitors. top trace: vout (500mv/div), bottom trace: iout (10a/div). figure 10: output voltage response to step-change in load current (50%- 75%-50% of iout(max): di/dt = 5a/ s). load cap: 470 f, 15 m w esr tantalum capacitor. top trace: vout (500mv/div), bottom trace: iout (10a/ figure 12: input terminal ripple current, i c , at full rated output current and nominal input voltage with 4.7 h source impedance and 100 f electrolytic capacitor (100 ma/div). see figure 11. figure 11: test set-up diagram showing measurement points for input terminal ripple current (figure 12), input reflected ripple current (figure 13) and output voltage ripple (figure 14). 4.7 h source impedance dc/dc converter figure 13 figure 12 figure 14 1 f ceramic capacitor 10 f, 100m w esr tantalum capacitor 100 f, 0.2 w esr electrolytic capacitor v source i s i c v out
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 8 technical specification figure 13: input reflected ripple current, i s , through a 4.7 h source inductor, using a 100 f input capacitor, at nominal input voltage and rated load current (10 ma/div). see figure 11. figure 14: 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: 500 mhz. see figure 11. figure 15: output voltage response to step-change in input voltage (50v to 100v in 200 s). load cap: 470 f, 15 m w esr tantalum capaci - tor. ch 1: vout (500mv/div), ch 2: vin (20v/div), at zero load current. figure 16: load current (10a/div) as a function of time when the convert - er attempts to turn on into a 10 m w short circuit. bottom trace (10ms/div) is an expansion of the on-time portion of the top trace (100ms/div). figure 17: output voltage vs. load current showing typical current limit curves and ovp shutdown point. ovp shutdown
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 9 technical specification basic operation and features the power qor exa series converter uses a two-stage power conversion topology. the first stage keeps the output voltage constant over variations in line, load, and temperature. the second stage uses a transformer to provide the functions 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 frequency 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 resistance, dissipate significantly less energy than schottky diodes, enabling the power qor converter to achieve high efficiency. 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 converter does not need a metal baseplate or potting material to help conduct the dissipated energy to the heatsink. as an open frame module, the power qor converter can be built more simply and reliably using high yield surface mount techniques on a pcb substrate. the power qor series of half-brick, quarter-brick and eighth - b rick converters uses the industry 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(-). the converter is available with either positive or negative logic used for the on/off input. in the positive logic version, the on/off input is active high (meaning that a high voltage turns the converter on ). in the negative logic version, the on/off signal is active low (meaning that a low voltage turns the converter on ). figure a details five possible circuits for driving the on/off pin. remote sense( + ) (pins 7 and 5) : the sense( + ) inputs correct for voltage drops along the conductors that connect the converters output pins to the load. pin 7 should be connected to vout(+) and pin 5 should be connected to vout(-) at the point on the board where regulation is desired. if these connections are not made, the converter will deliver an output voltage that is slightly higher than its specified value. note : the output over-voltage protection circuit senses the voltage across the sense leads (pins 7 and 5) to determine when it should trigger, not the voltage across the converters output pins (pins 8 and 4). 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. synqor uses industry standard trim equations. to decrease the output voltage, the user should connect a resistor between pin 6 (trim) and pin 5 (sense( C ) input). for a desired decrease of the nominal output voltage, the value of the resistor should be: r trim-down = ( 511 ) _ 10.22 k w d% where d% = v nominal C v desired x 100% v nominal open collector enable circuit figure a: various circuits for driving the on/off pin. remote enable circuit direct logic drive negative logic (permanently enabled) positive logic (permanently enabled) on/off vin( _ ) on/off on/off vin( _ ) on/off 5v cmos vin( _ ) on/off vin( _ ) vin( _ ) application section
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 10 technical specification to increase the output voltage, the user should connect a resistor between pin 6 (trim) and pin 7 (sense(+) input). for a desired increase of the nominal output voltage, the value of the resistor should be r trim-up (k w ) ) where v out = nominal output voltage = ( _ 511 _ 10.22 5.11v out ( 100+ d % ) 1.225 d % d % figure b graphs the relationship between the trim resistor value, rtrim-up and rtrim-down, showing the total range the output volt - age can be trimmed up or down. figure b: trim graph for 12vout 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 circuit to engage, particularly during transients. it is not necessary for the user to add capacitance at the trim pin. the node is internally filtered to eliminate noise. limited 10% up-trim : this converter is capable of operating for an indefinite period of time with the output trimmed up to 5% above the nominal 12v output level*. it may also be trimmed down by as much as 50% (to 6.0v) indefinitely. this converter is also capable of being trimmed up by as much as 10% (up to 13.2v) for shorter periods of time that are not a significant fraction of the product lifetime. for example, in a test situation, or for output voltage margining where it would remain trimmed up between 5% and 10% of the nominal voltage for a few hundred hours, but not for an indefinite period or the product lifetime. the ovp trip point is set above this level, so it will not shut down from output overvoltage protection when trimmed up between 5% and 10%. continuous operation of this converter while trimmed up more than 5% could affect long term reliability. total d c v ariation o f v out: 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 to avoid an input system instability problem, which is described in more detail in the application note titled input system instability on the synqor website . the lockout circuitry is a comparator with dc hysteresis. when the input voltage is rising, it must exceed the typical turn-on voltage threshold value* 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 : if the output current exceeds the output dc current limit inception point*, then a fast linear current limit controller will reduce the output voltage to maintain a constant output current. if as a result, the output voltage falls below the output dc current limit shutdown voltage * for more than 50ms, then the unit will enter into hiccup mode, with a 500ms off-time. the unit will then automatically attempt to restart. back-drive current limit : if there is negative output current of a magnitude larger than the back-drive current limit while enabled specification*, then a fast back-drive limit controller will increase the output voltage to maintain a constant output current. if this results in the output voltage exceeding the output over- voltage protection threshold*, then the unit will shut down. the full i-v output characteristics can be seen in figure 17. output over-voltage limit : if the voltage directly across the output pins exceeds the output over-voltage protection threshold*, the converter will immediately stop switching. this shutdown is latching; unlike other shutdown types, the converter will not restart unless the input power is cycled or the on/off input is toggled. over-temperature shutdown : a temperature sensor on the converter 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-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*. * see electrical characteristics page.
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 11 technical specification application considerations limited output voltage resolution: the internal voltage control feedback loop has limited resolution. therefore, the output voltage will exhibit discrete steps as the loop responds to changes in line, load, trim, or remote sense. for instance, on close exami - nation, the startup ramp has a stair-step shape. likewise, a load transient response will be composed of multiple discrete steps. the size of each step is well determined, and is shown in figure c. a close-up picture of a single step is shown in figure d. stepping will not occur under steady state conditions. current share and active trim not recommended: it is important to note that external feedback control using the sense or trim pins will cause sustained stepping. external current share or active trim circuits contain a separate reference voltage. after this external feedback has taken control, the actual output voltage can still differ from the external reference voltage by as much as the step size. if the external feedback loop integrates this error volt - age, it will cause a limit cycle oscillation. for this reason, external feedback using the sense and trim pins is not recommended. 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. figure c: output voltage resolution. figure d: smallest possible vout step at 48vin and 12vout. * see electrical characteristics page.
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 12 technical specification application circuits : figure e below provides a typical circuit diagram which details the input filtering and voltage trimming. input filtering and external input capacitance : figure f below shows the internal input filter components. this filter dra - matically reduces input terminal ripple current, which otherwise could exceed the rating of an external electrolytic input capacitor. the recommended external input capacitance 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. output filtering and external output capacitance : figure f below shows the internal output filter components. this filter dramatically reduces output voltage ripple. however, some minimum external output capacitance is required, as specified in the output characteristics section on the electrical specifications page. no damage will occur without this capacitor connected, but peak output voltage ripple will be much higher. v in external input filter trim v in(+ ) i load c load c 1 l in c 2 v out(+ ) r trim-up or r trim-down v sense(+ ) on/off regulation stage isolation stage current sense v in( _ ) v in(+ ) v in( _ ) v out(+ ) v out( _ ) v out( _ ) v sense( _ ) electrolytic capacitor 100f esr @ 0.2 w figure e: typical application circuit (negative logic unit, permanently enabled). figure f: internal input and output filter diagram (component values listed on specifications page) .
input: output: current: package: 35-75 v 12 v 25 a (300w) quarter-brick product # pq60120qea25 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-2qe612j rev. d 0 8/07/09 p age 13 technical specification part numbering system the p art n umbering s ystem f or s ynqors d c-dc c onverters follows t he f ormat s hown i n t he e xample b elow. the f irst 1 2 c haracters c omprise t he b ase p art n umber a nd the l ast 3 c haracters i ndicate a vailable o ptions. t he -g suffix i ndicates 6 /6 r ohs c ompliance. application notes a v ariety o f a pplication n otes a nd t echnical w hite p apers c an be d ownloaded i n p df f ormat f rom o ur w ebsite. rohs compliance: t he e u l ed r ohs ( restriction o f h azardous substances) d irective b ans t he u se o f l ead, c admium, hexavalent c hromium, m ercury, p olybrominated b iphenyls (pbb), a nd p olybrominated d iphenyl e ther ( pbde) i n e lectrical and e lectronic e quipment. t his s ynqor p roduct i s 6 /6 r ohs compliant. f or m ore i nformation p lease r efer t o s ynqors rohs a ddendum a vailable a t o ur rohs c ompliance / l ead f ree initiative w eb p age o r e -mail u s a t rohs@synqor.com . ordering information the t ables b elow s how t he v alid m odel n umbers a nd o rdering options f or c onverters i n t his p roduct f amily. w hen o rdering synqor c onverters, p lease e nsure t hat y ou u se t he c omplete 15 c haracter p art n umber c onsisting o f t he 1 2 c haracter base p art n umber a nd t he a dditional c haracters f or o ptions. add -g t o t he m odel n umber f or 6 /6 r ohs c ompliance. the following options must be included in place of the w x y z spaces in the model numbers listed above. many operational functions of this converter are programmable. contact the factory regarding customization. not al l combi nations make vali d part numbers, please contact synq or for avai lability. see the product summary web page f or mor e opti ons. patents synqor holds the following u.s. patents, one or more of which apply to this product. additional patent applications may be pending or fled in the future. 5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146 7,119,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702 warranty synqor offers a t hree ( 3 ) year l imited warran ty. compl ete warran ty i nforma - tion i s l isted on our websi te or i s avai lable upon request from synq or. information furnish ed 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. product family package size performance level thermal design output current 6/6 rohs options (see ordering information) input voltage output voltage contact synqor for further information: phone : 978-849-0600 toll free : 888-567-9596 fax : 978-849-0602 e-mail : power@synqor.com web: www.synqor.com address : 155 swanson road boxborough, ma 01719 usa w x y z thermal design enable logic pin style feature set a - open frame b - baseplated p - positive n - negative k - 0.110" n - 0.145" r - 0.180" y - 0.250" s - standard model number input voltage output voltage max output current p60120ewxyz 25 - 35v 12v 25a p q 6 0 1 2 0 q e a 2 5 n n s - g

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