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product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 1 technical specification 48v in 1.8v out 25a quarter quarter brick brick the PQ48018QNA25 powerqor? quarter brick converter is a next-generation, board-mountable, isolated, fixed switching frequency dc/dc converter that uses synchronous rectification to achieve extremely high conversion efficiency. the power dissipated by the converter is so low that a heatsink is not required, which saves cost, weight, height, and application effort. all of the power and control components are mounted to the multi-layer pcb substrate with high-yield surface mount technology. since the powerqor converter has no explicit thermal connections, it is extremely reliable. high efficiency, no heatsink, isolated dc/dc converter PQ48018QNA25 module mechanical features ? industry standard pin-out configuration (pin for pin compatible with lucent qhw series) industry standard size: 1.45? x 2.3? total height less than 0.40?, permits better airflow and smaller card pitch total weight: 34 grams (1.2 oz.), lower mass great- ly reduces vibration and shock problems safety features 2000v, 10 m ? input-to-output isolation provides input/output ground separation ul 1950 recognized (us & canada), basic insula- tion rating tuv certified to en60950 safety features (cont.) meets 72/23/eec and 93/68/eec directives which facilitates ce marking in user?s end product board and plastic components meet 94v-0 flamma- bility requirements operational features ultra-high efficiency, 84% at full rated load current delivers up to 25 amps of output current with mini- mal derating - no heatsink required wide input voltage range: 35v ? 75v meets or exceeds all 48v bus standards fixed frequency switching provides predictable emi performance no minimum load requirement means no preload resistors required protection features input under-voltage lockout disables converter at low input voltage conditions output current limit and short circuit protection protects converter from excessive load current or short circuits output over-voltage protection protects load from damaging voltages thermal shutdown protects converter from abnor- mal environmental conditions control 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: +10%/-20%, permits custom voltages and voltage margining
product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 2 technical specification 48v in 1.8v out 25a quarter quarter brick brick shown actual size pin no. name function 1 vin(+) positive input voltage (35v - 75v) 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. pin 5 must be connected to vout(-) at load. 2. leave pin 6 open for nominal output voltage. 3. pin 7 must be connected to vout(+) at load. 1) all dimensions in inches (mm) 2) pins 1-3, 5-7 are 0.040? (1.02mm) dia. with 0.080? (2.03mm) dia. standoff shoulders. 3) pins 4 and 8 are 0.062? (1.57 mm) dia. with 0.100? (2.54mm) dia. standoff shoulders. 4) all pins are brass with tin/lead plating over nickel 5) tolerances: x.xx in. +/-0.02 in. (0.5mm) x.xxx in. +/-0.010 in. (0.25mm) 6) weight: 1.20 oz. (34 g) 7) workmanship: meets or exceeds ipc-a-610b class ii options the PQ48018QNA25 comes in two versions that differ by the sense of the logic used for the on/off control signal. the PQ48018QNA25p version uses positive logic; mean- ing that the converter is on when the on/off signal (pin 2) is high. the PQ48018QNA25n version uses negative logic; the converter is on when the on/off signal is low. logic input is ttl compatible with an internal pull up. safety the PQ48018QNA25 series of converters are ul 1950 recognized (us & canada) with basic insulation rating and tuv certified to en60950 requirements. the converters also meet 72/23/eec and 93/68/eec directives as well as 94v-0 flammability requirements for board and plastic components. an external input fuse must always be used to meet these safety requirements. 0.40 (10.2) 0.300 (7.62) 1.45 (36.8) 0.43 (10.8) 0.14 (3.6) 2.30 (58.4) 2.00 (50.8) 0.150 (3.81) 0.300 (7.62) 0.450 (11.43) 0.600 (15.24) 0.600 (15.24) 0.110 * (2.79) top view side view * other pin lengths available absolute maximum ratings input voltage: non-operating: 100v continuous operating: 80v continuous 100v 10 s transients , 1% duty cycyle input/output isolation voltage: 2000v storage temperature: -55c to +125c operating temperature: -40c to +115c voltage at on/off input pin: +18v / -2v patents : synqor is protected under various patents, including but not limited to u.s. patent # 5,999,417.
product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 3 technical specification 48v in 1.8v out 25a quarter quarter brick brick parameter notes and conditions PQ48018QNA25 min. typ. max. units input 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 hysteresis voltage 2.5 3.5 4.5 v maximum input current 100% load, 35vin 1.5 a no-load input current 45 60 ma off converter input current 1.6 3 ma inrush current transient rating .01 a 2 s input reflected-ripple current p-p thru 10 h inductor ; figures 13 & 15 3 ma output characteristics output voltage set point 1.782 1.800 1.818 v output voltage regulation over load + 2 + 5mv over line + 2 + 5mv over temperature + 9 + 27 mv total output voltage range over sample load, line and temperature 1.75 1.85 v output voltage ripple and noise 20mhz bandwidth; figures 13 & 16 peak-to-peak full load, 1 f ceramic, 10f tantalum 50 100 mv rms full load, 1 f ceramic, 10f tantalum 10 20 mv operating output current range 025a output dc current-limit inception output voltage 10% low; figure 17 26 30 34 a short-circuit protection (redundant shutdown) 52 56 60 a dynamic characteristics input voltage ripple rejection 120 hz; figure 20 86 db output voltage current transient 470f load cap, 5a/s; figure 12 positive step change in output current 50% io to 75% io 160 mv negative step change in output current 75% io to 50% io 200 mv settling time to 1% 800 s turn-on transient turn-on time figures 9 &10 4 8 ms start-up inhibit period -40c to +125c; figure f 180 200 215 ms maximum output capacitance full load; 5% overshoot of v out at startup 35,000 f efficiency 100% load figure 1 84.2 % 50% load 86.0 % temperature limits for power derating curves semiconductor junction temperature package rated to 150c 125 c board temperature board rated to 165c 125 c transformer temperature figures 5 & 7 125 c isolation characteristics isolation voltage 2000 v isolation resistance 10 m ? isolation capacitance 470 pf feature characteristics switching frequency 220 240 260 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) pull-up voltage see circuit diagram; figure e vin/6.5 9.2 v pull-up resistance pull up to vin/6 40 k ? output voltage trim range across pins 8 & 4; figures b & c -20 +10 % output voltage remote sense range across pins 7 & 5 +10 % output over-voltage protection over full temp range; % of nominal vout 117 122 127 % over-temperature shutdown average pcb temperature 125 c PQ48018QNA25 electrical characteristics (t a =25c, airflow rate=300 lfm, v in =48vdc unless otherwise noted; full operating temperature range is -40c to +115c ambient temperature with appropriate power derating.) specifications subject to change without notice.
product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 4 performance curves 48v in 1.8v out 25a quarter quarter brick brick 60 65 70 75 80 85 90 0 3 5 8 10 13 15 18 20 23 25 load current (a) efficiency (%) 36 vin 48 vin 75 vin figure 1: efficiency vs. load current for minimum, nominal, and maximum input voltage at 25 c. 80 81 82 83 84 85 86 87 88 0 100 200 300 400 500 air flow (lfm) efficiency (%) 25 c 40 c 55 c figure 2: efficiency at 60% rated power vs. airflow rate for ambient air temperatures of 25 c, 40 c, and 55 c and nominal input voltage. 0 1 2 3 4 5 6 7 8 9 10 0 3 5 8 10 13 15 18 20 23 25 load current (a) power dissipation (w) 36 vin 48 vin 75 vin figure 3: power dissipation vs. load current for minimum, nominal, and maximum input voltage at 25 c. 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0 100 200 300 400 500 air flow (lfm) power dissipation (w) 25 c 40 c 55 c figure 4: power dissipation at 60% rated power vs. airflow rate for ambient air temperatures of 25 c, 40 c, and 55 c and nominal input voltage. 0 5 10 15 20 25 0 2540557085 ambient air temperature ( o c) i out (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 5: maximum output power-derating curves vs. ambient air tem- perature for airflow rates of 0 lfm through 400 lfm with air flowing across the converter from pin 3 to pin 1 (nominal input voltage). figure 6: thermal plot of converter at 25 amp load current with 55 c air flowing at the rate of 200 lfm. air is flowing across the converter sideways from pin 3 to pin 1 (nominal input voltage). vin = 48v semiconductor junction temperature is within 2 c of surface temperature vin = 48v vin = 48v
product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 5 performance curves 48v in 1.8v out 25a quarter quarter brick brick 0 5 10 15 20 25 0 2540557085 ambient air temperature ( o c) i out (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- perature for airflow rates of 0 lfm through 400 lfm with air flowing lengthwise from output to input (nominal input voltage). figure 8: thermal plot of converter at 25 amp load current with 55 c air flowing at the rate of 200 lfm. air is flowing across the converter in the long direction from output to input (nominal input voltage). figure 9: turn-on transient at full rated load current (resistive load) (2 ms/div) top trace: vout; 1v/div bottom trace: on/off input; 5v/div figure 10: turn-on transient at zero load current (2 ms/div). top trace: vout; 1v/div bottom trace: on/off input; 5v/div figure 11 : output voltage response to step-change in load current (50%-75%-50% of imax; di/dt = 0.1a/ s). load cap: 10 f, 100 m ? esr tantalum capacitor and 1 f ceramic capacitor. top trace: vout (100mv/div), bottom trace: iout (5a/div). figure 12 : output voltage response to step-change in load current (50%-75%-50% of imax: di/dt = 5a/ s). load cap: 470 f, 30 m ? esr tantalum capacitor and 1 f ceramic capacitor. top trace: vout (100mv/div), bottom trace: iout (5a/div). vin = 48v semiconductor junction temperature is within 2 c of surface temperature
product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 6 performance curves 48v in 1.8v out 25a quarter quarter brick brick figure 14: input terminal ripple current, i c , at full rated output cur- rent and nominal input voltage with 10 h source impedance and 47 f electrolytic capacitor (100 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 (10 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 terminal ripple current (figure 14), input reflected ripple current (figure 15) and output voltage ripple (figure 16). 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0 5 10 15 20 25 30 load current (a) output voltage (v) 36 v 48 v 75 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. top trace is an expansion of the on-time portion of the bottom trace. 10 h source impedance dc/dc converter figure 15 figure 14 figure 16 1 f ceramic capacitor 10 f, 100m ? esr tantalum capacitor 47 f, <1 ? esr electrolytic capacitor v source i s i c v out
product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 7 performance curves 48v in 1.8v out 25a quarter quarter brick brick 0.0001 0.001 0.01 0.1 1 10 100 1,000 10,000 100,000 hz output impedance ( ) 36 vin 48 vin 75 vin figure 19: output impedance (z out = v out /i out ) for minimum, nomi- nal, 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 forward transmission (db) 36 vin 48 vin 75 vin figure 20: forward transmission (ft = v out /v in ) for minimum, nomi- nal, and maximum input voltage at full rated power. -70 -60 -50 -40 -30 -20 -10 0 10 100 1,000 10,000 100,000 hz reverse transmission (db) 36 vin 48 vin 75 vin figure 21: reverse transmission (rt = i in /i out ) for minimum, nomi- nal, and maximum input voltage at full rated power. 0.1 1 10 100 10 100 1,000 10,000 100,000 hz input impedance ( ) 36 vin 48 vin 75 vin figure 22: input impedance (z in = v in /i in ) for minimum, nominal, and maximum input voltage at full rated power.
basic operation and features the power qor series converter uses a two-stage power cir- cuit topology. the first stage is a buck-converter that 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 transformer?s output is accomplished with synchronous rectifiers. these devices, which are mosfets with a very low on-state resistance, dissipate far less energy than schottky diodes used in conventional dc/dc converters. this is the primary reason that the power qor converter has such high efficiency?even at very low output voltages and very high output currents. dissipation throughout the converter is so low that the power qor converter requires no heatsink to deliver a greater level of power than can be delivered by a con- ventional, schottky-diode-based dc/dc converter with a 0.5? high heatsink. at equivalent ambient air temperature, airflow rate, and output power level, the hottest semicon- ductor junction temperature and the hottest pcb temperature within the power qor converter are cooler than those found in conventional dc/dc converters with a 0.5? high heatsink attached. 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. the power qor converter can thus be built more simply using high yield surface mount techniques on a pcb substrate. unlike conventional dc/dc converters, which have critical thermal connections between the power components and the baseplate, and between the baseplate and the heatsink, the power qor converter has no explicit, failure-prone thermal connections. compared to a conventional schottky-diode-based dc/dc converter with a 0.5? high heatsink, the power qor convert- er is more efficient and therefore it dissipates less than half the energy. additionally, because the power qor converter is thinner (0.4? vs. 1.0?), the board-to-board pitch in a rack can be much smaller, and cooling airflow is less impeded by the converter. because the power qor converter is much lighter, vibration and shock-induced problems are greatly reduced. moreover, due to the lack of failure-prone explicit thermal connections and the lack of potting material the power qor converter is more reliable than conventional dc/dc converters. the power qor series converter uses the industry standard pin-out configuration used by other vendors of comparably sized and rated dc/dc converters. the unit is pin for pin compatible with the lucent qw series. the power qor converter has many standard control and protection features. all shutdown features are non-latching, meaning that the converter shuts off for 200ms before restarting. (see figure f ) an on/off input permits the user to control when the converter is on and off in order to properly sequence dif- ferent power supplies and to reduce power consumption during a standby condition. remote sense inputs permit the user to maintain an accurate voltage at the load despite distribution voltage drops between the converter?s output and the load. an output voltage trim input permits the user to trim the output voltage up or down to achieve a custom volt- age level or to do voltage margining. an input under-voltage lockout avoids input system instability problems while the input voltage is rising. the output current limit protects both the converter and the board on which it is mounted against a short cir- cuit condition. an output over-voltage limit circuit shuts the unit down if the output voltage at the output pins gets too high. a sensor located in a central spot of the pcb provides a pcb temperature limit . if, due to an abnormal con- dition, this spot gets too hot, the converter will turn off. once the converter has cooled, it will automatically turn on again without the need to recycle the input power. control pin descriptions pin 2 (on/off ): the on/off input, pin 2, permits the user to control when the converter is on or off . this input is product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 8 technical specification 48v in 1.8v out 25a quarter quarter brick brick
referenced to the return terminal of the 48v input bus. there are two versions of the power qor series converter that differ by the sense of the logic used for the on/off input. in the pqxxyyyqnazzpxx version, the on/off input is active high (meaning that a high turns the converter on ). in the pqxxyyyqnazznxx 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. pins 7 and 5 (sense(+ )) : the sense(+ ) inputs correct for voltage drops along the conductors that connect the con- verter?s 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 regu- lation is desired. that is, [ vout(+) - vout(-) ] ? [ sense(+) - sense (-) ] < 10%v out pins 7 and 5 must be connected for proper regulation of the output voltage. however, if these connections are not made, nothing catastrophic will happen to the converter under nor- mal operating conditions?the converter will simply deliver an output voltage that is slightly higher than its specified value. note : the output over-voltage protection circuit senses the voltage across the output (pins 8 and 4) to determine when it should trigger, not the voltage across the converter?s sense pins (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. pin 6 (trim) : the trim input permits the user to adjust the output voltage across the sense leads up or down. to lower the output voltage, the user should connect a resistor between pin 6 and pin 5, which is the sense(-) input. to raise the output voltage, the user should connect a resistor between pin 6 and pin 7, which is the sense(+) input. a resistor connected between pin 6 and pin 5 will decrease the output voltage. for a desired decrease of ? percent of the nominal output voltage, the value of this resistor should be product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 9 technical specification 48v in 1.8v out 25a quarter quarter brick brick figure a: various circuits for driving the on/off pin. open collector enable circuit remote enable circuit direct logic drive negative logic (permanently enabled) positive logic (permanently enabled) on/off v in( _ ) on/off on/off v in( _ ) on/off 5v ttl/ cmos v in( _ ) on/off v in( _ ) v in( _ ) r trim-down = ( 511 ) - 10.22 ? % (k ? ) ? = ( v nom ? v des ) x 100% v nom where v nom = nominal voltage v des = desired voltage and
figure b graphs this relationship between r trim-down and ? . the output voltage can be trimmed down as much as 20%. figure b: trim down graph for 1.8vout a resistor connected between pin 6 and pin 7 will increase the output voltage. for a desired increase of ? percent of the nominal output voltage, the value of this resistor should be figure c graphs this relationship between r trim-up and ? . the output voltage can be trimmed up as much as 10%. figure c: trim up graph for 1.8vout 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 tran- sients. 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 +10%/-20% protection features input under-voltage lockout : the converter is designed to turn off when the input voltage is too low, help- ing avoid an input system instability problem, described in more detail below. the lockout circuitry is a comparator with dc hysteresis. when the input voltage is rising, it must exceed a typical value of 33v before the converter will turn on. once the converter is on, the input voltage must fall below a typical value of 29.5v before the converter will turn off. output current limit : the current limit does not change appreciably 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 approximately 60% of its nominal value, the converter turns off. the converter then enters a 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 pre- vents excessive heating of the converter or the load board (see figure 18). output over-voltage limit : if the voltage across the output pins exceeds the o.v. threshold, the converter will immediately stop switching. this prevents damage to the load circuit due to 1) a sudden unloading of the converter, 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. thermal shutdown : the power qor series has a temper- ature sensor located such that it senses the average temper- ature of the converter. the thermal shutdown circuit is designed to turn the converter off when the temperature at product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 10 technical specification 48v in 1.8v out 25a quarter quarter brick brick 10 100 1,000 10,000 0 2 4 6 8 10 12 14 16 18 20 % decrease in output voltage trim resistance (kohms) 10 100 1,000 10,000 012345678910 % increase in output voltage trim resistance (kohms) r trim-up (k ? ) ) where v out = nominal output voltage = ( _ 511 _ 10.22 5.11v out ( 100+ ? % ) 1.225 ? % ? %
the sensed location reaches 115c. it will allow the con- verter to turn on again when the temperature of the sensed location falls below 110c. application considerations input system instability : this condition can occur because a 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 solu- tion for correcting it. application circuits: figure d below provides a typical circuit diagram which is useful when using input filtering and voltage trimming. figure e is a detailed look of the inter- nal on/off circuitry that is shown in figure a . product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 11 technical specification 48v in 1.8v out 25a quarter quarter brick brick figure e: internal on/off pin circuitry ttl 5v 50k 274k v in( + ) on/off v in( _ ) 35v < v in < 75v input filtering trim v in( + ) i load c load v out( + ) r trim-up or r trim-down v sense( + ) on/off v in( _ ) v out( _ ) v sense( _ ) electrolytic capacitor 33f esr ? 1 ? figure d: typical application circuit (negative logic unit, permanently enabled). 50k 100pf
product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 12 technical specification 48v in 1.8v out 25a quarter quarter brick 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 generates a 5hz "hiccup mode," which prevents the converter from over- heating. 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 34v (typ.), the unit is disabled by the input under-voltage lockout fea- ture. when the input voltage rises above 34v, 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 4ms (typ.) "turn on time." under-voltage lockout turn-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 start-up inhibit period) t 0 t 1 t 2 t 4ms (typical turn on time) on on on off off
product # PQ48018QNA25 phone 1-888-567-9596 doc.# 005-2qn418d_b 9/04/01 page 13 technical specification 48v in 1.8v out 25a quarter quarter brick brick part numbering system the part numbering system for synqor?s power qor dc/dc converters has the following format: example part #: p p q q 4 4 8 8 0 0 3 3 3 3 q q n n a a 2 2 5 5 n n n n s s this part number indicates a power qor converter with 48vin, 3.3vout, quarter-brick size, normal performance level, open air design, 25 amps output current, negative logic, 0.145? pins, and the standard feature set. when ordering synqor converters, please ensure that you use the complete 15 character part number. w arranty synqor offers a three (3) year limited warranty. complete warranty information is listed on our web site or is available upon request from synqor. information furnished by synqor is believed to be accurate and reliable. however, no responsibility is assumed by synqor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of synqor. contact synqor for further information: phone : 978-567-9596 t oll free : 888-567-9596 fax : 978-567-9599 e-mail : sales@synqor.com w eb : www.synqor.com address : 188 central street hudson, ma 01749 output performance thermal "rated" pos./neg. product family input voltage voltage package size series design output current logic pin length features pq 48 033 q n a 25 n n s 015 - 1.5v 018 - 1.8v 020 - 2.0v 025 - 2.5v 033 - 3.3v 050 - 5.0v 20 - 20 amps 060 - 6.0v 17 - 16.67 amps 120 - 12v 08 - 8.33 amps 150 - 15v 07 - 6.67 amps s - standard quarter-brick product family and part numbering scheme base part number options pq - powerqor 48 - (35v-75v) q - quarter brick n - normal a - open frame b - baseplate 25 - 25 amps p - positive n - negative k - 0.110" n - 0.145" r - 0.180" y - 0.250"

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