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t t echnical echnical s s pecification pecification pq60015egl25 pq60015egl25 product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 1 t t h h e e p p q q 6 6 0 0 0 0 1 1 5 5 e e g g l l 2 2 5 5 p p o o w w e e r r q q o o r r ? ? g g i i g g a a e e i i g g h h t t h h -b b r r i i c c k k c c o o n n - v v e e r r t t e e r r i i s s a a n n e e x x t t -g g e e n n e e r r a a t t i i o o n n , , b b o o a a r r d d -m m o o u u n n t t a a b b l l e e , , i i s s o o l l a a t t e e d d , , f f i i x x e e d d s s w w i i t t c c h h i i n n g g f f r r e e q q u u e e n n c c y y d d c c / / d d c c c c o o n n v v e e r r t t e e r r t t h h a a t t u u s s e e s s s s y y n n c c h h r r o o - n n o o u u s s r r e e c c t t i i f f i i c c a a t t i i o o n n t t o o a a c c h h i i e e v v e e e e x x t t r r e e m m e e l l y y h h i i g g h h c c o o n n v v e e r r s s i i o o n n e e f f f f i i - c c i i e e n n c c y y . . t t h h e e p p o o w w e e r r d d i i s s s s i i p p a a t t e e d d b b y y t t h h e e c c o o n n v v e e r r t t e e r r i i s s s s o o l l o o w w t t h h a a t t a a h h e e a a t t s s i i n n k k i i s s n n o o t t r r e e q q u u i i r r e e d d , , w w h h i i c c h h s s a a v v e e s s c c o o s s t t , , w w e e i i g g h h t t , , h h e e i i g g h h t t , , a a n n d d a a p p p p l l i i c c a a t t i i o o n n e e f f f f o o r r t t . . a a l l l l o o f f t t h h e e p p o o w w e e r r a a n n d d c c o o n n t t r r o o l l c c o o m m - p p o o n n e e n n t t s s a a r r e e m m o o u u n n t t e e d d t t o o t t h h e e m m u u l l t t i i -l l a a y y e e r r p p c c b b s s u u b b s s t t r r a a t t e e w w i i t t h h h h i i g g h h -y y i i e e l l d d s s u u r r f f a a c c e e m m o o u u n n t t t t e e c c h h n n o o l l o o g g y y . . s s i i n n c c e e t t h h e e p p o o w w e e r r q q o o r r c c o o n n v v e e r r t t e e r r h h a a s s n n o o e e x x p p l l i i c c i i t t t t h h e e r r m m a a l l i i n n t t e e r r f f a a c c e e s s , , i i t t i i s s e e x x t t r r e e m m e e l l y y r r e e l l i i a a b b l l e e . . pq60015egl25 module 48v 48v in in 1.5v 1.5v out out 25amp 25amp 2000vdc 2000vdc eighth-brick eighth-brick input input output output current current isolation isolation dc/dc conver dc/dc conver ter ter ? high efficiency, >83% at full rated load current delivers up to 25 amps of output current with minimal derating - no heatsink required wide input voltage range: 35v ? 75v, with 100v 100ms input voltage transient capability fixed frequency switching provides predictable emi performance no minimum load requirement means no preload resistors required operational features operational 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 conse- quent hazardous conditions active back bias limit prevents damage to converter from external load induced pre-bias output over-voltage protection protects load from dam- aging voltages thermal shutdown protects converter from abnormal environmental conditions pr pr otection features otection features 2000v, 30 m ? input-to-output isolation provides input/output ground separation ul 1950 recognized (us & canada), basic insulation rating tuv certified to en60950 meets 72/23/eec and 93/68/eec directives which facilitates ce marking in user?s end product board and plastic components meet ul94v-0 flammabil- ity requirements safety features safety features industry standard eighth-brick pin-out configuration industry standard size: 0.90? x 2.3? (22.9x58.4mm) total height only 0.335? (8.5mm), permits better airflow and smaller card pitch total weight: 0.68 oz. (19 grams) flanged pins designed to permit surface mount solder- ing (avoid wave solder) using fpip technique mechanical features mechanical features on/off control referenced to input side (positive and negative logic options are available) remote sense for the output voltage compensates for output distribution drops output voltage trim permits custom voltages and voltage margining contr contr ol features ol features
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 2 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification pin no. name function 1 vin(+) positive input voltage 2 on/off ttl input to turn converter on and off, referenced to vin(-), with internal pull up. 3 vin(-) negative input voltage 4 vout(-) negative output voltage 5 sense(-) negative remote sense 1 6 trim output voltage trim 2 7 sense(+) positive remote sense 3 8 vout(+) positive output voltage notes: 1. sense(-) may be connected to vout(-) or left open. 2. leave trim pin open for nominal output voltage. 3. sense(+) may be connected to vout(+) or left open. notes 1) pins 1-3, 5-7 are 0.040? (1.02mm) diameter. with 0.080? (2.03mm) diameter standoff shoulders. 2) pins 4 and 8 are 0.062? (1.57 mm) diameter with 0.100? (2.54 mm) diameter standoff shoulders. 3) other pin extension lengths available. recommended pin length is 0.03? (0.76mm) greater than the pcb thickness. 4) all pins: material - copper alloy finish - tin/lead over nickel plate 5) undimensioned components are shown for visual reference only. 6) all dimensions in inches (mm) tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 7) weight: 0.68 oz. (19 g) typical 8) workmanship: meets or exceeds ipc-a-610c class ii 9) modules can be ordered as ega option that have different pins to provide a minimum bottom side clearance of 0.076? while increasing maximum height to 0.424?. see ordering page for more information. 10) the flanged pins are designed to permit surface mount soldeing (avoiding the wave soldering process) through the use of the flanged pin-in-paste technique. 0.300 (7.62) 0.600 (15.24) 0.90 (22.86) 0.150 (3.81) 0.150 (3.81) 0.300 (7.62) 0.450 (11.43) 0.600 (15.24) 0.14 (3.56) 2.30 (58.42) 2.00 (50.8) top view pin designations mechanical diagram flanged pin see note 10 side view load board bottom side clearance see note 9 lowest component 0.110 (2.79) see note 3 0.019 + 0.013 (0.48 + 0.33) 0.335 (8.5) ega option 0.424 (10.76) max height see note 9 ega option 0.076 (1.93) min clearance see note 9
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 3 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification parameter min. typ. max. units notes & conditions absolute maximum ratings input voltage non-operating 100 v continuous operating 80 v continuous operating transient protection 100 v 100 ms transient, square wave isolation voltage (input to output) 2000 v basic insulation, pollution degree 2 operating temperature -40 100 c storage temperature -55 125 c voltage at on/off input pin -2 18 v input characteristics operating input voltage range 35 48 75 v input under-voltage lockout turn-on voltage threshold 31.5 33.3 34.4 v turn-off voltage threshold 29.5 31.0 32.4 v lockout voltage hysteresis 2.2 2.3 2.4 v maximum input current 0.9 a 100% load, 35 vin no-load input current 25 ma disabled input current 2 5 ma inrush current transient rating 0.01 a 2 s response to input transient 50 mv 1000v/ms input transient input reflected ripple current 3.0 ma rms thru 10 h inductor; figures 13 & 15 input terminal ripple current 210 ma rms ; figures 13 & 14 recommended input fuse 10 a fast blow external fuse recommended input filter component values (l\c) 4.7\1.0 h\f internal values, see figure e recommended external input capacitance 47 f typical esr 0.1-0.2 ? , see figure 13 output characteristics output voltage set point 1.485 1.50 1.515 v output voltage regulation over line + 0.05 \ 2 + 0.1 \ 5 %\mv over load + 0.1 \ 2 + 0.2 \ 5 %\mv over temperature + 6 + 20 mv total output voltage range 1.46 1.54 v over sample, line, load, temperature & life output voltage ripple and noise 1 20mhz bandwidth; figures 13 & 16 peak-to-peak 75 130 mv full load, see figures 13 & 16 rms 18 25 mv full load, see figures 13 & 16 operating output current range 0 25 a subject to thermal derating; figures 5-8 output dc current-limit inception 28.5 a output voltage 10% low; figure 17 output dc current-limit shutdown voltage 0.7 v back-drive current limit while enabled 0.45 a negative current drawn from output back-drive current limit while disabled 10 50 ma negative current drawn from output maximum output capacitance 45,000 f 1.5vout at 25a resistive load dynamic characteristics input voltage ripple rejection 80 db 120 hz; figure 20 output voltage during load current transient for a step change in output current (0.1a/s) 80 mv 50% to 75% to 50% iout max; figure 11 for a step change in output current (5a/s) 150 mv 50% to 75% to 50% iout max; figure 12 settling time 300 s to within 1% vout nom turn-on transient turn-on time 14 18 ms full load, vout=90% nom.; figures 9 & 10 start-up inhibit time 180 200 240 ms -40c to +125c; figure f output voltage overshoot 0 % 45,000 f load capacitance, iout = 0a efficiency 100% load 83.5 % figures 1 - 4 50% load 86 % figures 1 - 4 temperature limits for power derating curves semiconductor junction temperature 125 c package rated to 150c board temperature 125 c ul rated max operating temp 130c transformer temperature 125 c see figures 5 - 8 for derating curves isolation characteristics isolation voltage (dielectric strength) 2000 v isolation resistance 30 m ? isolation capacitance 2 470 pf pq60015egl25 electrical characteristics t a =25c, airflow rate=300 lfm, v in =48vdc unless otherwise noted; full operating temperature range is -40c to +100c ambient tem- perature with appropriate power derating. specifications subject to change without notice. note 1: for applications requiring reduced output voltage ripple and noise, consult synqor applications support (e-mail: suppor t@synqor.com) note 2: higher values of isolation capacitance can be added external to the module.
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 4 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification parameter p min. typ. max. units notes & conditions feature characteristics switching frequency 195 225 255 khz regulation and isolation stages on/off control (option p) off-state voltage -2 0.8 v on-state voltage 2.4 18 v on/off control (option n) off-state voltage 2.4 18 v on-state voltage -2 0.8 v on/off control (either option) figures a, b pull-up voltage vin/6 15 v pull-up resistance 40 k ? output voltage trim range -20 +10 % measured across pins 8 & 4; figure c output voltage remote sense range +10 % measured across pins 8 & 4 output over-voltage protection 120 125 130 % over full temp range; % of nominal vout over-temperature shutdown 125 c average pcb temperature over-temperature shutdown restart hysteresis 10 c load current scale factor 800 see app note: output load current calc. reliability characteristics calculated mtbf (telcordia) 2.5 10 6 hrs. tr-nwt-000332; 80% load,300lfm, 40 o c t a calculated mtbf (mil-217) 1.1 10 6 hrs. mil-hdbk-217f; 80% load, 300lfm, 40 o c t a field demonstrated mtbf 10 6 hrs. see website for latest values standards compliance parameter p notes standards compliance ul/cul 60950 file # e194341, basic insulation & pollution degree 2 en60950 certified by tuv 72/23/eec 93/68/eec needle flame test (iec 695-2-2) test on entire assembly; board & plastic components ul94v-0 compliant iec 61000-4-2 esd test, 8kv - np, 15kv air - np (normal performance) gr-1089-core section 7 - electrical safety, section 9 - bonding/grounding telcordia (bellcore) gr-513 an external input fuse must always be used to meet these safety requirements. contact synqor for official safety certificates on new releases or download from the synqor website. qualification testing parameter p # units test conditions qualification testing life test 32 95% rated v in and load, units at derating point, 1000 hours vibration 5 10-55hz sweep, 0.060? total excursion,1 min./sweep, 120 sweeps for 3 axis mechanical shock 5 100g minimum, 2 drops in x and y axis, 1 drop in z axis temperature cycling 10 -40c to 100c, unit temp. ramp 15c/min., 500 cycles power/thermal cycling 5 t operating = min to max, v in = min to max, full load, 100 cycles design marginality 5 t min -10c to t max +10c, 5c steps, v in = min to max, 0-105% load humidity 5 85c, 85% rh, 1000 hours, 2 minutes on and 6 hours off solderability 15 pins mil-std-883, method 2003 extensive characterization testing of all synqor products and manufacturing processes is performed to ensure that we supply robust, reliable product. contact factory for official product family qualification document. electrical characteristics (continued) options synqor provides various options for enable logic and pin length for this family of dc/dc converters. please consult the last page of this specification sheet for information on available options. patents synqor is protected under various patents, including but not lim- ited to u.s. patent numbers 5,999,417; 6,222,742 b1; 6,594,159 b2; 6,545,890 b2.
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 5 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification 60 65 70 75 80 85 90 95 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 load current (a) efficiency (%) 35 vin 48 vin 75 vin figure 1: efficiency at nominal output voltage vs. load current for min- imum, nominal, and maximum input voltage at 25 c. 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 nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25 c, 40 c, and 55 c (nominal input voltage). 0 1 2 3 4 5 6 7 8 9 0 3 5 8 10 13 15 18 20 23 25 load current (a) power dissipation (w) 35 vin 48 vin 75 vin figure 3: power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25 c. 0.0 1.0 2.0 3.0 4.0 5.0 0 100 200 300 400 500 air flow (lfm) power dissipation (w) 25 c 40 c 55 c figure 4: power dissipation at nominal output voltage and 60% rated power vs. airflow rate for ambient air temperatures of 25 c, 40 c, and 55 c (nominal input voltage). 0 2 4 6 8 10 12 14 16 18 20 22 24 26 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) 50 lfm (0.25 m/s) figure 5: maximum output power derating curves vs. ambient air tem- perature for airflow rates of 50 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). semiconductor junction temperature is within 1 c of surface temperature
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 6 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification 0 2 4 6 8 10 12 14 16 18 20 22 24 26 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) 50 lfm (0.25 m/s) figure 7: maximum output power-derating curves vs. ambient air tem- perature for airflow rates of 50 lfm through 400 lfm with air flowing from input to output (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 from input to output (nominal input voltage). figure 9: turn-on transient at full load (resistive load) (5 ms/div). input voltage pre-applied. ch 1: vout (500mv/div). ch 2: on/off input (5v/div) figure 10: turn-on transient at zero load (4 ms/div). ch 1: vout (500mv/div). ch 2: on/off input (5v/div). figure 11 : output voltage response to step-change in load current (50%- 75%-50% of iout(max); di/dt = 0.1a/ s). load cap: 10 f, 100 m ? esr tanta- lum cap and 1 f ceramic cap. ch 1: vout (100mv/div), ch 2: iout (10a/div). figure 12 : output voltage response to step-change in load current (50%- 75%-50% of iout(max): di/dt = 5a/ s). load cap: 470 f, 30 m ? esr tanta- lum cap and 1 f ceramic cap. ch 1: vout (100mv/div), ch 2: iout (10a/div). semiconductor junction temperature is within 1 c of surface temperature
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 7 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification 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). 10 h source impedance dc/dc converter see fig. 15 see fig. 14 see fig. 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 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 (200 ma/div). see figure 13. figure 15: input reflected ripple current, i s , through a 10 h source inductor at nominal input voltage and rated load current (5 ma/div). see figure 13. figure 16: output voltage ripple at nominal input voltage and rated load current (50 mv/div). load capacitance: 1 f ceramic capacitor and 10 f tantalum capacitor. bandwidth: 20 mhz. see figure 13. 0.0 0.5 1.0 1.5 2.0 0 5 10 15 20 25 30 load current (a) output voltage (v) 35 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 (2.0ms/div) is an expansion of the on-time portion of the bottom trace.
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 8 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification 0.0001 0.001 0.01 0.1 10 100 1,000 10,000 100,000 hz output impedance ( ? ? ) 35 vin 48 vin 75 vin figure 19: magnitude of incremental output impedance (z out = v out /i out ) for minimum, nominal, and maximum input voltage at full rated power. -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1,000 10,000 100,000 hz forward transmission (db) 35 vin 48 vin 75 vin figure 20: magnitude of incremental forward transmission (ft = v out /v in ) for minimum, nominal, and maximum input voltage at full rated power. -60 -50 -40 -30 -20 -10 0 10 10 100 1,000 10,000 100,000 hz reverse transmission (db) 35 vin 48 vin 75 vin figure 21: magnitude of incremental reverse transmission (rt = i in /i out ) for minimum, nominal, and maximum input voltage at full rated power. 0.1 1 10 100 1000 10 100 1,000 10,000 100,000 hz input impedance ( ? ? ) 35 vin 48 vin 75 vin figure 22: magnitude of incremental input impedance (z in = v in /i in ) for minimum, nominal, and maximum input voltage at full rated power.
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 9 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification basic operation and features the power qor series converter uses a two-stage power conver- sion topology. the first stage is a buck-converter that keeps the output voltage constant over variations in line, load, and temper- ature. the second stage uses a transformer to provide the func- tions of input/output isolation and voltage step-down to achieve the low output voltage required. both the first stage and the second stage switch at a fixed fre- quency for predictable emi performance. rectification of the transformer?s output is accomplished with synchronous rectifiers. these devices, which are mosfets with a very low on-state resis- tance, dissipate far less energy than schottky diodes. this is the primary reason that the power qor converter has such high effi- ciency, even at very low output voltages and very high output cur- rents. dissipation throughout the converter is so low that it does not require a heatsink for operation. since a heatsink is not required, the power qor converter does not need a metal baseplate or pot- ting material to help conduct the dissipated energy to the heatsink. the power qor converter can thus be built more simply and reliably using high yield surface mount techniques on a pcb substrate. the power qor series of eighth-brick, quarter-brick and half-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(-). there are two versions of the converter that differ by the sense of the logic used for the on/off input. in the positive logic version, the on/off input is active high (meaning that a high turns the converter on ). in the negative logic version, the on/off signal is active low (meaning that a low turns the converter on ). figure a details five possible circuits for driving the on/off pin. figure b is a detailed look of the inter- nal on/off circuitry. remote sense(+ ) (pins 7 and 5) : the sense(+ ) inputs cor- rect for voltage drops along the conductors that connect the con- verter?s output pins to the load. pin 7 should be connected to vout(+) and pin 5 should be con- nected to vout(-) at the point on the board where regulation is desired. a remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, that is [ vout(+) - vout(-) ] ? [v sense(+) - v sense(-) ] < sense range % x vout pins 7 and 5 must be connected for proper regulation of the out- put voltage. if these connections are not made, the converter will deliver an output voltage that is slightly lower than its specified value. note : the output over-voltage protection circuit senses the voltage open collector enable circuit figure a: various circuits for driving the on/off pin. figure b: internal on/off pin circuitry remote enable circuit direct logic drive negative logic (permanently enabled) positive logic (permanently enabled) on/off vin( _ ) on/off on/off vin( _ ) on/off 5v ttl/ cmos vin( _ ) on/off vin( _ ) vin( _ ) ttl 5v 50k 274k v in(+) on/off v in( _ ) 50k 100pf
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 10 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification across the output (pins 8 and 4) to determine when it should trig- ger, not the voltage across the converter?s sense leads (pins 7 and 5). therefore, the resistive drop on the board should be small enough so that output ovp does not trigger, even during load transients. output voltage trim (pin 6) : the trim input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications. to decrease the output voltage, the user should connect a resistor between pin 6 and pin 5 (sense(-) input). for a desired decrease of the nominal output voltage, the value of the resistor should be r trim-down = ( 511 ) - 10.22 (k ? ) ? % where ?% = v nominal ? v desired x 100% v nominal to increase the output voltage, the user should connect a resistor between pin 6 and pin 7 (sense(+) input). for a desired increase of the nominal output voltage, the value of the resistor should be figure c graphs the relationship between the trim resistor value and rtrim-up and rtrim-down, showing the total range the output voltage can be trimmed up or down. figure c: trim graph for 1.5vout module note : the trim feature does not affect the voltage at which the output over-voltage protection circuit is triggered. trimming the output voltage too high may cause the over-voltage protection cir- cuit to engage, particularly during transients. it is not necessary for the user to add capacitance at the trim pin. the node is internally bypassed to eliminate noise. total dc variation of vout: for the converter to meet its full specifications, the maximum variation of the dc value of vout, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range. protection features input under-voltage lockout : the converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the appli- cation note titled ?input system instability?. the lockout circuitry is a comparator with dc hysteresis. when the input voltage is ris- ing, it must exceed the typical turn-on voltage threshold value (listed on the specification page) before the converter will turn on. once the converter is on, the input voltage must fall below the typical turn-off voltage threshold value before the converter will turn off. output current limit : the maximum current limit remains con- stant as the output voltage drops. however, once the impedance of the short across the output is small enough to make the output voltage drop below the specified output dc current-limit shutdown voltage, the converter turns off. the converter then enters a ?hiccup mode? where it repeatedly turns on and off at a 5 hz (nominal) frequency with a 5% duty cycle until the short circuit condition is removed. this prevents excessive heating of the converter or the load board. output over-voltage limit : if the voltage across the output pins exceeds the output over-voltage protection threshold, the converter will immediately stop switching. this prevents damage to the load circuit due to 1) excessive series resistance in output current path from converter output pins to sense point, 2) a release of a short-circuit condition, or 3) a release of a current limit condition. load capacitance determines exactly how high the output voltage will rise in response to these conditions. after 200 ms the converter will automatically restart. over-temperature shutdown : a temperature sensor on the converter senses the average temperature of the module. the thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the over- temperature shutdown value. it will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the over-temperature shutdown restart hysteresis r trim-up (k ? ) ) where v out = nominal output voltage = ( _ 511 _ 10.22 5.11v out ( 100+ ? % ) 1.225 ? % ? % 1 10 100 1,000 10,000 0 2 4 6 8 10 12 14 16 18 20 trim resistance (kohms) % increase vout % decrease vout
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 11 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification value. application considerations input system instability: this condition can occur because any dc/dc converter appears incrementally as a negative resistance load. a detailed application note titled ?input system instability? is available on the synqor web site (www.synqor.com) which provides an understanding of why this instability arises, and shows the preferred solution for cor- recting it. application circuits: figure d below provides a typical cir- cuit diagram which details the input filtering and voltage trim- ming. input filtering and external capacitance: figure e below provides a diagram showing the internal input filter components. this filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of an external elec- trolytic input capacitor. the recommended external input capac- itance is specified in the ?input characterisitcs? section. more detailed information is available in the application note titled ?emi characteristics? on the synqor website. v in external input filter trim v in(+) i load c load l c v out(+) r trim-up or r trim-down v sense(+) on/off v in( _ ) v in(+) v in( _ ) v out( _ ) v sense( _ ) figure d: typical application circuit (negative logic unit, permanently enabled). figure e: internal input filter diagram (component values listed on page 3) . electrolytic capacitor 47f
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 12 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification startup inhibit period: the startup inhibit period ensures that the converter will remain off for approximately 200ms when it is shut down for any reason. when an output short is present, this generates a 5hz "hiccup mode," which prevents the converter from overheating. in all, there are seven ways that the converter can be shut down, initiating a startup inhibit period: input under-voltage lockout input over-voltage shutdown (not present in eighth-brick) output over-voltage protection over temperature shutdown current limit short circuit protection turned off by the on/off input figure f shows three turn-on scenarios, where a startup inhibit period is initiated at t 0 , t 1 , and t 2 : before time t 0 , when the input voltage is below the uvl threshold, the unit is disabled by the input under-voltage lockout feature. when the input voltage rises above the uvl threshold, the input under-voltage lockout is released, and a startup inhibit period is initiated. at the end of this delay, the on/off pin is evaluated, and since it is active, the unit turns on. at time t 1 , the unit is disabled by the on/off pin, and it cannot be enabled again until the startup inhibit period has elapsed. when the on/off pin goes high after t 2 , the startup inhibit period has elapsed, and the output turns on within the typical turn-on time. under-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 on on on off off 9ms (typical turn on time)
product # pq60015egl25 phone 1-888-567-9596 www.synqor.com doc.# 005-2eg651d rev. a 9/3/03 page 13 input: input: output: output: current: current: p p ackage: ackage: 35-75 v 35-75 v 1.5 v 1.5 v 25 a 25 a eighth-brick eighth-brick t t echnical s echnical s pecification pecification part numbering system the part numbering system for synqor?s power qor dc/dc converters follows the format shown in the example below. the first 12 characters comprise the base part number and the last 3 characters indicate available options. although there are no default values for enable logic and pin length, the most common options are negative logic and 0.145? pins. these part numbers are more likely to be readily available in stock for evaluation and prototype quantities. ordering information the tables below show the valid model numbers and ordering options for converters in this product family. when ordering synqor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional 3 characters for options. modules above can be ordered to have an increased bottom side board clearance and a slightly larger total height (see page 2 for dimensions). to order these parts, replace egl in part number with ega . there are no other differences from the egl units. the following option choices must be included in place of the x y z spaces in the model numbers listed above. w arranty synqor offers a three (3) year limited warranty. complete warranty 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 : 978-849-0600 t oll free : 888-567-9596 fax : 978-849-0602 e-mail : sales@synqor.com w eb : www.synqor.com address : 155 swanson road boxborough, ma 01719 application notes a variety of application notes and technical white papers can be downloaded in pdf format at www.synqor.com. output max output voltage current pq60010egl20 xyz 35 - 75 v 1.0 v 20 a pq60010egl25 xyz 35 - 75 v 1.0 v 25 a pq60012egl20 xyz 35 - 75 v 1.2 v 20 a pq60012egl25 xyz 35 - 75 v 1.2 v 25 a pq60015egl20 xyz 35 - 75 v 1.5 v 20 a pq60015egl25 xyz 35 - 75 v 1.5 v 25 a pq60018egl20 xyz 35 - 75 v 1.8 v 20 a pq60018egl25 xyz 35 - 75 v 1.8 v 25 a pq60025egl20 xyz 35 - 75 v 2.5 v 20 a pq60025egl25 xyz 35 - 75 v 2.5 v 25 a pq60033egl20 xyz 35 - 75 v 3.3 v 20 a pq60050egl15 xyz 35 - 75 v 5.0 v 15 a model number input voltage enable pin feature logic length set p - positive n - negative k - 0.110" n - 0.145" r - 0.180" y - 0.250" s - standard options description: x y z pq 60 015 e g l 25 n n s product family package size performance level thermal design output current options (see ordering information) input voltage output voltage

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