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technical specification pq60120qea17 product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 1 pq60120qea17 module 35-75v 12v 17a 2250vdc quarter-brick input outputs current isolation dc-dc converter page no. mechanical diagram (open frame) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 mechanical diagram (base-plated) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 pq60120qea17 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . 4-5 pq60120qea17 standards compliance & qualification testing . . . . . . . 6 pq60120qea17 figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9 application section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 contents operational features ? ultra-high effciency, >95% at full rated load current, >96% at half rated load current ? delivers up to 17 a of output current (200 w) with minimal derating - no heatsink required ? wide input voltage range: 35v C 75v, with 100v, 100ms input voltage transient capability ? fixed frequency switching provides predictable emi performance ? no minimum load requirement means no preload resistors required ? wide output voltage trim range (-50% to +5%), see trim section mechanical features ? industry standard quarter-brick pin-out confguration ? industry standard size: 1.45 x 2.3 (36.8x58.4mm) ? total height less than 0.436 (11.06mm), permits better airfow and smaller card pitch ? total weight: 1.6 oz. (46 grams) ? flanged pins designed to permit surface mount soldering (avoid wave solder) using fpip technique control features ? on/off control referenced to input side (positive and negative logic options are available) protection features ? input under-voltage lockout disables converter at low input voltage conditions ? output current limit and short circuit protection protects converter and load from permanent damage and consequent hazardous conditions ? active back bias limit provides smooth startup with external load induced pre-bias ? latching output over-voltage protection protects load from damaging voltages ? thermal shutdown protects converter from abnormal environmental conditions safety features ? 2250v, 30 m input-to-output isolation provides input/output ground separation ? ul 60950-1 recognized (us & canada), basic insulation rating ? tuv certifed to en60950-1 ? meets 72/23/eec and 93/68/eec directives which facilitates ce marking in users end product ? board and plastic components meet ul94v-0 fammability requirements the pq60120qea17 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. this converter is available in open-frame and base-plated versions. rohs compliant (see page 14).
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 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 nts 1) pi ns 1-3, 5-7 are 0.040 (1.02mm) diameter with 0.080 (2.03 mm) diameter standoff shoulders. 2) pi ns 4 and 8 are 0.062 (1.57 mm) diameter with 0.100 3) o ther pin extension lengths available. recommended pin length is 0.03 (0.76mm) greater than the pcb thickness. 4) al l pins: material - copper alloy fi nish (rohs 5/6) - tin/lead over nickel plate fi nish (rohs 6/6) - matte tin over nickel plate 5) undi mensioned components are shown for visual reference only. tolerances: x.xx +0.02 in. (x.x +0.5mm) x.xxx +0.010 in. (x.xx +0.25mm) 7) wei ght: 1.5 oz. (42 g) typical 8) workman ship: 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 input/primary circuit. 10) the flanged pins are designed to permit surface mount soldering (allowing to avoid the wave soldering process) through the use of the flanged pin-in-paste technique. 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) pin sinatins pin nam function vin(+) positive input voltage on/off ttl input to turn converter on and off, referenced to vin(C), with internal pull up. vin(C) negative input voltage vout(C) negative output voltage sense(C) negative remote sense trim output voltage trim sense(+) positive remote sense 8 vout(+) positive remote sense notes: sense(C) should be connected to vout(C) either remotely or at the converter. leave trim pin open for nominal output voltage. 3. sense(+) should be connected to vout(+) either remotely or at the converter.
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 3 technical specification top view side view notes 1) pi ns 1-3, 5-7 are 0.040 (1.02mm) diameter with 0.080 (2.03 mm) diameter standoff shoulders. 2) pi ns 4 and 8 are 0.062 (1.57 mm) diameter with 0.100 (2.54 mm) diameter standoff shoulders. 3) o ther pin extension lengths available. recommended pin length is 0.03 (0.76mm) greater than the pcb thickness. 4) al l pins: material - copper alloy finish (rohs 5/6) - tin/lead over nickel plate finish (rohs 6/6) - matte tin over nickel plate 5) undi mensioned components are shown for visual reference only. 6) al l dimensions in inches (mm) toleran ces: x.xx +0.02 in. (x.x +0.5mm) x.xxx +0.010 in. (x.xx +0.25mm) 7) wei ght: 2.4 oz. (69 g) typical 8) workman ship: 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 (avoiding the wave soldering process) through the use of the flanged pin-in-paste technique. 11) m 3 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) appl ied torque per screw should not exceed 6 in-lb (0.7 nm). 1 7 6 5 4 2 3 ottom 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 oard langed 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 pin designations pin name function 1 vin(+) positive input voltage 2 on/off ttl input to turn converter on and off, referenced to vin(C), with internal pull up. 3 vin(C) negative input voltage 4 vout(C) negative output voltage 5 sense(C) negative remote sense 1 6 trim output voltage trim 2 7 sense(+) positive remote sense 3 8 vout(+) positive remote sense 3 notes: 1. sense(C) should be connected to vout(C) either remotely or at the converter. 2. leave trim pin open for nominal output voltage. 3. sense(+) should be connected to vout(+) either remotely or at the converter. mechanical diagram (base-plated)
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 4 technical specification pq60120qea17 electrical characteristics ta = 25c, airfow rate = 300 lfm, vin = 48 v dc unless otherwise noted; full operating temperature range is -40c to +100 c baseplate temperature with appropriate power derating. specifcations subject to change without notice. parameter min. typ. max. units notes & conditions absolute maximum ratings input voltage v 80 v v 100ms transient, square wave isolation voltage v dc voltage at on/off input pin 18 v input characteristics operating input voltage range 48 v 100v transient for 100ms input under-voltage lockout turn-on voltage threshold v turn-off voltage threshold 28 v lockout voltage hysteresis v maximum input current 100% load, 35 vin, trimmed up 5% no-load input current response to input transient v 0.25 v/s input transient input refected ripple current rms thru 4.7h inductor input terminal ripple current rms recommended input fuse fast blow external fuse recommended input filter component values (l\c) 3.3/3 h\f internal values; see figure f (lin\c2) recommended external input capacitance typical esr 0.1-0.2 output characteristics output voltage set point v output voltage regulation over line 1.0\120 %\mv over load 1.0\120 %\mv over temperature mv total output voltage range 11.58 v over sample, line, load, temperature & life output voltage ripple and noise 500 mhz bandwidth; see note 2 mv rms mv operating output current range subject to thermal derating output dc current-limit inception 18 28 output voltage 10% low output dc current-limit shutdown voltage v back-drive current limit while enabled negative current drawn from output source back-drive current limit while disabled negative current drawn from output source maximum output capacitance electrolytic 12vout at 17a resistive load
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 5 technical specification pq60120qea17 electrical characteristics ta = 25c, airfow rate = 300 lfm, vin = 48 v dc unless otherwise noted; full operating temperature range is -40c to +100c baseplate temperature with appropriate power derating. specifcations subject to change without notice. parameter min. typ. max. units notes & conditions dynamic characteristics output voltage during load current transient step change in output current (0.1 a/s) mv 50% to 75% to 50% iout max step change in output current (5 a/s) mv 50% to 75% to 50% iout max to within 1% vout nom full load, on/off to vout=90% nom. output voltage overshoot % maximum output capacitance, iout =0a efficiency 100% load % 50% load % isolation characteristics isolation voltage (dielectric strength) v isolation resistance m temperature limits for power derating curves semiconductor unction temperature 125 c package rated to 150c board temperature ul r ated max operating temp 130c feature characteristics switching frequency regulation stage 238.0 khz over sample, temp & life switching frequency isolation stage 117.8 khz over sample, temp & life on/off control (option p) off-state voltage v on-state voltage 18 v on/off control (option n) off-state voltage 18 v on-state voltage v on/off control (either option) figures a & b on/off control hysteresis v pull-up voltage v pull-up resistance k output voltage trim range +5 % measured across pins 8 & 4; see trim section output over-voltage protection 118 % over full temp range; % of nominal vout over-temperature shutdown average pcb temperature over-temperature shutdown restart hysteresis reliability characteristics calculated mtbf (telcordia) tr-nwt-000332 hrs. tr-nwt-000332; 80% load, 300lfm, 40c ta calculated mtbf (mil-217) mil-hdbk-217f 2.8 hrs. mil-hdbk-217f; 80% load, 300lfm, 40c ta field demonstrated mtbf tbd hrs. see website for details 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: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 6 technical specification pq60120qea17 standards compliance & qualification testing parameter notes & conditions standards compliance ul 60950-1:2003 basic insulation can/csa-c22.2 no. 60950-1:2003 en60950-1:2001 test on entire assembly; board & plastic components ul94v-0 compliant esd test, 8 kv - np, 15 kv air - np (normal performance) note: an external input fuse must always be used to meet these safety requirements. contact synqor for offcial safety certifcates on new releases or download from the synqor website. parameter # units test conditions qualification testing life test 95% rated vin and load, units at derating point, 1000 hours vibration 10-55 hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis 100g minimum, 2 drops in x and y axis, 1 drop in z axis temperature cycling -40 c to 100 c, unit temp. ramp 15 c/min., 500 cycles power/thermal cycling toperating = min to max, vin = min to max, full load, 100 cycles design marginality tmin-10 c to tmax+10 c, 5 c steps, vin = min to max, 0-105% load humidity 85 c, 85% rh, 1000 hours, continuous vin applied except 5 min/day solderability mil-std-883, method 2003
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 7 technical specification 60 65 70 75 80 85 90 95 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 load current (a) efficiency (%) 35 vin 48 vin 75 vin 0 2 4 6 8 10 12 14 16 18 20 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 load current (a) power dissipation (w) 35 vin 48 vin 75 vin 0 3 6 9 12 15 18 21 25 40 55 70 85 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 3 6 9 12 15 18 21 25 40 55 70 85 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) figure 1: efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25c. figure 2: power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25c. figure 3: maximum output power derating curves vs. ambient air temperature for airflow rates of 100 lfm through 400 lfm with air flowing across the converter from pin 1 to pin 3 (nominal input voltage). figure 4: thermal plot of converter at 17a load current (200w) with 55c air flowing at the rate of 200 lfm. air is flowing across the converter sideways from pin 1 to pin 3 (nominal input voltage). figure 5: maximum output power derating curves vs. ambient air temperature for airflow rates of 100 lfm through 400 lfm with air flowing lengthwise from input to output (nominal input voltage). figure 6: thermal plot of converter at 17a load current (200 w) with 55c air flowing at the rate of 200 lfm. air is flowing across the converter from input to output (nominal input voltage). figures
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 8 technical specification 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 figure 7: turn-on transient at full load (resistive load) (4ms/div). ch 1: on/off input (5v/div), ch 2: vout (2v/div) figure 8: turn-on transient at zero load (4ms/div). ch 1: on/off input (5v/div), ch 2: vout (2v/div) figure 9: output voltage response to step-change in load current (50%-75%-50% of iout(max); di/dt = 5a/s). load cap: 1uf ceramic and 10uf tantalum 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: 470f, 15 mw esr tantalum capacitor. top trace: vout (500mv/div), bottom trace: iout (10a/div). 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). figure 12: input terminal ripple current, ic, at full rated output current and nominal input voltage with 4.7h source impedance and 100f electrolytic capacitor (100 ma/ div). see figure 11.
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 9 technical specification 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 -15 -10 -5 0 5 10 15 20 25 30 load current (a) output voltage (v) 36vin 48vin 75vin ovp shutdown figure 13: input reflected ripple current, is, through a 4.7h source inductor, using a 100f input capacitor, at nominal input voltage and rated load current (10ma/div). see figure 11. figure 14: output voltage ripple at nominal input voltage and rated load current (50mv/div). load capacitance: 1f ceramic capacitor and 10f tantalum capacitor. bandwidth: 500 mhz. see figure 11. figure 15: output voltage response to step-change in input voltage (50v to 100v in 200s). load cap: 470f, 15 mw esr tantalum capacitor. ch 1: vin (20v/div), ch 2: vout (1v/div), at zero load current. figure 16: load current (5a/div) as a function of time when the converter attempts to turn on into a 10 mw short circuit. figure 17: output voltage vs. load current showing typical current limit curves and ovp shutdown point.
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 10 technical specification basic operation and features the power qor exa series converter uses a two-stage power con - version 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 isola - tion 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 trans - formers 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-brick converters uses the industry standard footprint and pin-out con - figuration. 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 con - verter 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 nega - tive logic version, the on/off signal is active low (meaning that a low voltage turns the converter on ). figure a details five pos - sible circuits for driving the on/off pin. remote s ense( + ) (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 connect - ed 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 v oltage t rim (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) a nd 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: riu irui r riig e ff i 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: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 11 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 figure b graphs the rela - tionship between the trim resistor value, rtrim-up and rtrim-down, showing the total range the output voltage 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 reliabil - ity. 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. 0.1 1.0 10.0 100.0 1,000.0 10,000.0 100,000.0 1,000,000.0 0 5 10 15 20 25 30 35 40 45 50 trim resistance (kohms) % increase in vout % decrease in vout r trim-up (k w ) ) where v out = nominal output voltage = ( _ 511 _ 10.22 5.11v out ( 100+ d % ) 1.225 d % d %
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 12 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. 0 20 40 60 80 100 120 140 35 40 45 50 55 60 65 70 75 vin (v) vout step size (mv) = 12.0 vout = 10.0 vout 8.75 vout figure c: output voltage resolution. figure d: smallest possible vout step at 48vin and 12vout. * see electrical characteristics page.
input: output: current: package: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 13 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: 35-75v 12v 17a (200w) quarter-brick product # pq60120qea17 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005068 rev. b 0 6/03/09 p age 14 technical specification part numbering system the part numbering system for synqors ni qor dc-dc convert - ers follows the format shown in the example below. the first 12 characters comprise the base part number and the last 3 characters indicate available options. although there are no default values for enable logic and pin length, the most common options are negative logic and 0.145 pins. these part numbers are more likely to be readily available in stock for evaluation and prototype quantities. a -g suffix indicates 6/6 rohs compliance. application notes a variety of application notes and technical white papers can be downloaded in pdf format from our website. patents synqor holds the following patents, one or more of which might apply to this product: 5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146 7,119,524 7,269,034 7,272,021 7,272,023 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 characters for options. a -g suffix indicates the product is 6/6 rohs compliant. the following options must be included in place of the w x y z spaces in the model numbers listed above. 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 synqor product is 6/6 rohs compliant. for more information please refer to synqors rohs addendum available at our rohs compliance / lead free initiative web page or e-mail us at rohs@synqor.com . p q 6 0 1 2 0 q e a 1 7 n n s product family package size performance level thermal design (see ordering info) output current options (see ordering information) input voltage output voltage warranty synqor offers a t hree ( 3 ) year limited warranty. complete warranty informa - tion is listed on our website or is available upon request from synqor. information furnished by synqor is believed to be accurate and reliable. however, no responsibility is assumed by synqor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of synqor. contact synqor for further information: phone : 978-849-0600 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 options description: 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 pq60120qe w17 xyz 36-75 v 1.8v 45a options description: w x y z thermal design enable logic pin style feature set a - open frame b - baseplated 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 pq60120qe w17 xys 35-75v 12v 17a

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