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technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 1 PQ50050HPB50 protection features mechanical features page no. page no. mechanical diagram (base-plated) ......................... 2 electrical characteristics ................................... 3 standards and qualifications ................................ 5 figures ............................................... 7 application section ..................................... 10 ordering information .................................... 14 control features contents operational features safety features 48v 5.0v 50a 2000v dc half-brick input output current isolation dc-dc converter ? industry standard pin-out configuration ? size: 2.3 x 2.4 (58.4 x 61.0mm) ? total height only 0.50 (12.7mm) ? total weight: 4.3oz. (123 grams) ? ultra-high efficiency, 92% at full rated load ? delivers up to 250w of output power with minimal derating ? operating input voltage range: 44-52v ? fixed frequency switching provides predictable emi performance ? input under-voltage lockout disables converter at low input voltage conditions ? output current limit and short circuit protection ? active back bias limit prevents damage to converter from external load induced pre-bias ? output over-voltage protection ? thermal shutdown ? 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 ? output voltage trim range of -20%, +10% the PQ50050HPB50 powerqor peta half- 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 peta series converters offer industry leading output current for a standard half-brick module. rohs compliant (see last page). pending ? 2000v, 30m input-to-output isolation ? ul 60950-1 recognized (us & canada), basic insulation rating ? tuv certifed to en60950-1 ? meets ul94v-0 fammability requirements
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 2 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 mechanical diagram (base-plated) baseplate mechanical diagram notes 1) applied torque per screw should not exceed 3in-lb (0.33nm). 2) baseplate fatness tolerance is 0.004 (.10mm) tir for surface 3) pins 1, 2, 4, 6-8 are 0.040 (1.02mm) diameter, with 0.080 (2.03mm) diameter standoff shoulders. 4) pins 5 and 9 are 0.080 (2.03 mm) diameter with 0.125 (3.18mm) diameter standoff shoulders. 5) other pin extension lengths available. 6) all pins: material: copper alloy finish: matte tin over nickel plate 7) undimensioned components are shown for visual reference only. 8) weight: 4.3oz (123g) for baseplated unit 9) all dimensions in inches (mm) tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) pin designations pin name function pin name function pin name function 1 vin(+) positive input voltage 1 vin(+) positive input voltage 1 vin(+) positive input voltage 2 on/off 2 on/off ttl input to turn converter on and off, referenced to vin(C), with internal pull up. 4 vin(C) negative input voltage 4 vin(C) negative input voltage 4 vin(C) negative input voltage 5 vout(-) negative output voltage 5 vout(-) negative output voltage 5 vout(-) negative output voltage 6 sense(C) negative remote sense(see note 1) 6 sense(C) negative remote sense(see note 1) 6 sense(C) negative remote sense(see note 1) 7 trim output voltage trim (see note 2) 7 trim output voltage trim (see note 2) 7 trim output voltage trim (see note 2) 8 sense(+) positive remote sense 8 sense(+) positive remote sense 8 sense(+) positive remote sense (see note 3) 9 vout(+) positive output voltage 9 vout(+) positive output voltage 9 vout(+) positive output voltage 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.
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 3 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 PQ50050HPB50 electrical characteristics ta = 25 c, airfow rate = 300 lfm, vin = 48v dc unless otherwise noted; full operating temperature range is -40 c to +70 c baseplate temperature with appropriate power derating. specifcations subject to change without notice. parameter min. typ. max. units notes & conditions notes & conditions absolute maximum ratings input voltage non-operating 100 v continuous operating 52 v continuous isolation voltage input to output 2000 v dc basic insulation level, pollution degree 2 operating temperature -40 100 c baseplate temperature storage temperature -55 125 c voltage at on/off input pin -2 18 v input characteristics operating input voltage range 44 48 52 v input under-voltage lockout turn-on voltage threshold 31.5 33.3 34.4 v turn-off voltage threshold 29.5 31 32.4 v lockout voltage hysteresis 2.2 2.3 2.4 v input over-voltage lockout turn-on voltage threshold 58.2 59.7 61.3 v turn-off voltage threshold 56.6 58.1 59.2 v lockout voltage hysteresis 1.5 1.6 1.8 v maximum input current 6.0 a 100% load, 44 vin 100% load, 44 vin no-load input current no-load input current 100 120 ma disabled input current 2 5 ma inrush current transient rating inrush current transient rating 0.04 a response to input transient 350.0 mv 1000v/ms input transient input refected ripple current input refected ripple current 5 ma rms thru 10h inductor; figs. 11 & 13 rms thru 10h inductor; figs. 11 & 13 input terminal ripple current 200 ma rms: figs. 11 & 12 rms: figs. 11 & 12 recommended input fuse recommended input fuse 20 a fast blow external fuse recommended input filter component values (c1\l\c2) 1\3\6.4 f\h\f internal values, see figure e internal values, see figure e recommended external input capacitance recommended external input capacitance 47 f typical esr 0.1-0.2 , see figure 11 typical esr 0.1-0.2 , see figure 11 output characteristics output voltage set point output voltage set point 4.95 5.00 5.05 v factory pre-set with sense(+), sense(-) open output voltage regulation over line 0.05 \ 3 0.1 \ 5 % \ mv over load 0.1 \ 5 +0.2 \ 10 % \ mv over temperature 15 30 mv total output voltage range 4.85 5.15 v over sample, line, load, temperature & life output voltage ripple and noise 20 mhz bandwidth; figs. 11 & 14 peak-to-peak 30 60 mv full load, see figures 11 & 14 rms 5 10 mv full load, see figures 11 & 14 operating output current range 0 50 a subject to thermal derating; fig. 5 output dc current-limit inception 53.7 57.9 62.1 a output voltage 10% low; fig. 6 output dc current-limit shutdown voltage 3.5 v back-drive current limit while enabled 1.5 2.5 3.8 a negative current drawn from output back-drive current limit while disabled 0 20 50 ma negative current drawn from output maximum output capacitance ceramic 34,000 f 5vout at 50a (resistive load) efficiency 100% load 92 % figures 1-4 50% load 93 % figures 1-4
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 4 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 PQ50050HPB50 electrical characteristics (continued) ta = 25 c, airfow rate = 300 lfm, vin = 48v dc unless otherwise noted; full operating temperature range is -40 c to +70 c baseplate temperature with appropriate power derating. specifcations subject to change without notice. parameter min. typ. max. units notes & conditions notes & conditions dynamic characteristics input voltage ripple rejection 60 db 120 hz; fg. 17 120 hz; fg. 17 output voltage during load current transient step change in output current (0.1 a/s) 200 mv 50% to 75% to 50% iout max; fgure 9 50% to 75% to 50% iout max; fgure 9 step change in output current (5 a/s) 300 mv 50% to 75% to 50% iout max; fgure 10 50% to 75% to 50% iout max; fgure 10 settling time 100 s to within 1% vout nom to within 1% vout nom turn-on transient turn-on time 22 30 ms full load, vout=90% nom.; figs. 7 & 8 full load, vout=90% nom.; figs. 7 & 8 start-up inhibit time 180 200 240 ms -40 o c to +125 o c; figure a output voltage overshoot 0 % 10,000 f load capacitance, iout = 0a 10,000 f load capacitance, iout = 0a isolation characteristics isolation voltage (dielectric strength) isolation voltage (dielectric strength) 2000 v see absolute maximum ratings see absolute maximum ratings isolation resistance 30 m isolation capacitance (input to output) isolation capacitance (input to output) 3300 pf see note 2 see note 2 temperature limits for power derating curves semiconductor junction temperature 125 c package rated to 150 c board temperature 125 c ul r ated max operating temp 130 c transformer temperature 125 c maximum baseplate temperature 100 c applies to baseplated units only feature characteristics switching frequency 198 220 242 khz regulation and isolation stages on/off control (option p) off-state voltage -2 0.8 v on-state voltage 2.7 18 v on/off control (option n) off-state voltage 2.7 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 42 k ? output voltage trim range -20 +10 % measured across pins 9 & 5; figure c output voltage remote sense range +10 % measured across pins 9 & 5 output over-voltage protection 115 120 125 % over full temp range; % of nominal vout over-temperature shutdown otp trip point 120 c average pcb temperature over-temperature shutdown restart hysteresis 10 c load current scale factor 1200 see app note: output load current calc. reliability characteristics calculated mtbf (telcordia) tr-nwt-000332 2.13 10 6 hrs. 75% load, 300lfm, 40 c ta calculated mtbf (mil-217) mil-hdbk-217f 1.3 10 6 hrs. 75% load, 300lfm, 40 c ta field demonstrated mtbf 10 6 hrs. see our website for details note 1: for applications requiring reduced output voltage ripple and noise, consult synqor application support e-mail: support@synqor.com note 2: higher values of isolation capacitance can be added external to the module.
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 5 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 standards and qualifications parameter notes & conditions standards compliance pending ul 60950-1:2003 basic insulation can/csa-c22.2 no. 60950-1:2003 en60950-1:2001 needle flame test (iec 695-2-2) test on entire assembly; board & plastic components ul94v-0 compliant iec 61000-4-2 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 test conditions qualification testing life test 32 95% rated vin and load, units at derating point, 1000 hours vibration 5 10-55 hz 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 -40 c to 100 c, unit temp. ramp 15 c/min., 500 cycles power/thermal cycling 5 toperating = min to max, vin = min to max, full load, 100 cycles design marginality 5 tmin-10 c to tmax+10 c, 5 c steps, vin = min to max, 0-105% load humidity 5 85 c, 85% rh, 1000 hours, continuous vin applied except 5 min/day solderability 15 pins mil-std-883, method 2003
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 6 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 50 load current (a) efficiency (%) 44 vin 48 vin 52 vin 0 2 4 6 8 10 12 14 16 18 20 22 24 0 5 10 15 20 25 30 35 40 45 50 load current (a) power dissipation (w) 44 vin 48 vin 52 vin 89 90 91 92 93 94 95 0 100 200 300 400 air flow (lfm) efficiency (%) 25o c 40o c 55o c 0 10 20 30 40 50 0 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 lfm (0.0 m/s) 0 1 2 3 4 5 6 7 0 5 10 15 20 25 30 35 40 45 50 55 60 load current (a) output voltage (v) 44 vin 48 vin 52 vin figure 1: efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25c. figure 2: effciency at nominal output voltage and 60% rated power vs. airfow rate for ambient air temperatures of 25c, 40c, and 55c (nominal input voltage). figure 3: power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25c. figure 4: power dissipation at nominal output voltage and 60% rated power vs. airfow rate for ambient air temperatures of 25c, 40c, and 55c (nominal input voltage). figure 5: maximum output power derating curves (no heatsink) vs. ambient air temperature for airfow rates of 0 lfm through 400 lfm with air fowing from input to output (nominal input voltage). figure 6: output voltage vs. load current showing typical current limit curves and converter shutdown points. 8 9 10 11 12 13 14 0 100 200 300 400 air flow (lfm) power dissipation (w) 25o c 40o c 55o c
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 7 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 10h source impedance input terminal input terminal input ripple current ripple current ripple input reflected ripple current ripple current ripple output voltage output voltage output ripple voltage ripple voltage 1 f ceramic capacitor 15 f, 450m ? esr tantalum capacitor 47 f, <1 ? esr electrolytic capacitor v source v out i s i c converter dc-dc figure 7: turn-on transient at full load (resistive load) (10 ms/div). input voltage pre-applied. top trace: vout (2v/div). bottom trace: on/off input (5v/div) figure 8: turn-on transient at zero load (10 ms/div). top trace: vout (2v/div). bottom trace: on/off input (5v/div) figure 9: output voltage response to step-change in load current (50%-75%- 50% of iout(max); di/dt = 0.1a/s). load cap: 15f, 450m? esr tantalum cap and 1f ceramic cap. top trace: vout (200mv/div), bottom trace:iout (20a/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, 15m? esr tantalum cap and 1f ceramic cap. top trace: vout (200mv/div), bottom trace:iout (20a/div). figure 11: test set-up diagram showing measurement points for input terminal ripple current (figure 12), input refected 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 10h source impedance and 47f electrolytic capacitor (200ma/div). (see figure 11).
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 8 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 figure 13: input refected ripple current, is, through a 10 h source inductor at nominal input voltage and rated load current (5 ma/div). (see figure 11). figure 14: output voltage ripple at nominal input voltage and rated load current (10 mv/div). load capacitance: two 1f ceramic capacitors and 15f tantalum capacitor. bandwidth: 20 mhz. (see figure 11). figure 15: load current (20a/div) as a function of time when the converter attempts to turn on into a 1 m? short circuit. top trace (2.5ms/div) is an expansion of the on-time portion of the bottom trace.
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 9 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1,000 10,000 100,000 hz forward transmission (db) 44 vin 48 vin 52 vin hz 0.1 1 10 100 10 100 1,000 10,000 100,000 hz input impedance (ohms) 44 vin 48 vin 52 vin hz 0.0001 0.001 0.01 0.1 10 100 1,000 10,000 100,000 hz output impedance (ohms) 44 vin 48 vin 52 vin -60 -50 -40 -30 -20 -10 0 10 100 1,000 10,000 100,000 hz reverse transmission (db) 44 vin 48 vin 52 vin hz figure 16: magnitude of incremental output impedance (z out figure 16: magnitude of incremental output impedance (z out figure 16: magnitude of incremental output impedance (z = v out = v out out /i out /i out out ) for out ) for out minimum, nominal, and maximum input voltage at full rated power. figure 17: magnitude of incremental forward transmission (ft = v out /v out /v out in ) for in ) for in minimum, nominal, and maximum input voltage at full rated power. figure 18: magnitude of incremental reverse transmission (rt = i in /i out ) for out ) for out minimum, nominal, and maximum input voltage at full rated power. figure 19: magnitude of incremental input impedance (z in figure 19: magnitude of incremental input impedance (z in figure 19: magnitude of incremental input impedance (z = v in /i in ) for in ) for in minimum, nominal, and maximum input voltage at full rated power.
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 10 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 basic operation and features the power qor series converter uses a two-stage power conversion power qor series converter uses a two-stage power conversion power 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 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 far less energy than schottky diodes. this is the primary reason that the power qor converter has such high efficiency, even power qor converter has such high efficiency, even power at very low output voltages and very high output currents. dissipation throughout the converter is so low that it does not require a heatsink for operation. since a heatsink is not required, the powerqor converter does not need a metal baseplate or pot- ting material to help conduct the dissipated energy to the heatsink. the powerqor converter can thus 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 configuration. control features remote on/off (pin 2): the on/off input, pin 2, permits the user to control when the converter is on or off. this input is ref- erenced 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 internal on/off circuitry. remote sense(+) (pins 8 and 6): remote sense(+) (pins 8 and 6): the sense(+) inputs the sense(+) inputs correct for voltage drops along the conductors that connect the converters output pins to the load. pin 8 should be connected to vout(+) and pin 6 should be con- nected to vout(-) at the point on the board where regulation is desired. a remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, that is [ vout(+) - vout(-) ] C [v sense(+) - v sense(-) ] < sense range % x vout pins 8 and 6 must be connected for proper regulation of the output voltage. if these connections are not made, the converter will deliver an output voltage that is slightly higher than its speci- fied value. note: the output over-voltage protection circuit senses the voltage note: the output over-voltage protection circuit senses the voltage across the output (pins 9 and 5) to determine when it should trig- ger, not the voltage across the converters sense leads (pins 8 and 6). therefore, the resistive drop on the board should be small enough so that output ovp does not trigger, even during load transients. figure a: various circuits for driving the on/off pin. ttl 5v on/off v in( _ ) v in( + in( + in( ) + ) + 50k 274k 50k 100pf open collector enable circuit remote enable circuit direct logic drive negative logic (permanently enabled) (permanently enabled) on/off vin( _ ) on/off on/off vin( _ ) on/off 5v ttl/ cmos vin( _ ) vin( _ ) positive logic on/off vin( _ ) figure b: internal on/off pin circuitry
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 11 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 output voltage trim (pin 7): 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 7 and pin 6 (sense(-) input). for a desired decrease of the nominal output voltage, the value of the resistor should be r trim-down = ( 100% ) - 2 (k w ) d ( d ( where d% = v nominal C v desired x 100% v nominal to increase the output voltage, the user should connect a resistor between pin 7 and pin 8 (sense(+) input). for a desired increase of the nominal output voltage, the value of the resistor should be (k w ) r trim-up = ( v nominal C 2 ) x v des + v nom 1.225 ( 1.225 ( v des - v nom 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. 1 10 100 1,000 10,000 100,000 0 2 4 6 8 10 12 14 16 18 20 trim resistance (kohms) % increase vout % decrease vout figure c: trim graph note: the trim feature does not affect the voltage at which the out- note: the trim feature does not affect the voltage at which the out- put 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 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 applica- tion 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 (listed on the specification page) before the con- verter 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. input over-voltage shutdown : available on pq48 models only. the converter turns off when the input voltage is too high, allowing the converter to withstand an input voltage as high as 100v without destruction. the shutdown circuitry is a comparator with dc hysteresis. when the input voltage exceeds the typical input over-voltage shutdown value, the converter will turn off. once the converter is off, it will turn back on when the input voltage falls below the minimum input over-voltage shutdown value. 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 heat- ing 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 cur- rent 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 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. 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
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 12 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 application considerations input system instability: this condition can occur because any dc/dc converter appears incrementally as a negative resistance load. a detailed application note titled input system instability is available on the synqor website which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. application circuits: figure d below provides a typical circuit diagram which details the input filtering and voltage trimming. 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 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. v in v in v external input filter trim v in(+) i load c load v out(+) r trim-up r trim-up r or r trim-down r trim-down r v sense(+) on/off v in( _ ) v out( _ ) v sense( _ ) electrolytic capacitor figure d: typical application circuit (negative logic unit, permanently enabled). typical application circuit (negative logic unit, permanently enabled). figure e: internal input filter diagram (component values listed on page 3) . c 2 c 1 l v in(+) v in( _ )
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 13 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 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 quarter-brick) ? output over-voltage protection ? over temperature shutdown ? current limit ? short circuit protection ? turned off by the on/off input figure f shows three turn-on scenarios, where a startup inhibit period is initiated at t 0 , t 1 , and t 2 : before time t 0 , when the input voltage is below the uvl threshold, the unit is disabled by the input under-voltage lockout feature. when the input voltage rises above the uvl threshold, the input under-voltage lockout is released, and a startup inhibit period is initiated. at the end of this delay, the on/off pin is evaluated, and since it is active, the unit turns on. at time t 1 , the unit is disabled by the on/off pin, and it cannot be enabled again until the startup inhibit period has elapsed. when the on/off pin goes high after t 2 , the startup inhibit period has elapsed, and the output turns on within the typical turn- on time. figure f: startup inhibit period (turn-on time not to scale) 200ms under-voltage lockout turn-on threshold on/off (positive logic) v out v in 200ms t 0 t 1 t 2 t on on off off 25 ms (typical turn on time) 200ms (typical turn start-up inhibit period time) on
technical specification product # PQ50050HPB50 p hone 1-888-567-9596 w ww.synqor.com d oc.# 005-0005487 rev. a 0 3/18/10 p age 14 input: 44-52v output: 5.0v current: 50a part no.: PQ50050HPB50 part numbering system the part numbering system for synqors 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. the -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. 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 rohs compliance / lead free initiative web page initiative web page or e-mail us at rohs@synqor.com . 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. add -g to the model number for 6/6 rohs compliance. w x y z not all combinations make valid part numbers, please contact synqor for availability. see the product summary web page for more options. many operational functions of this converter are programmable. contact the factory regarding customizing. warranty warranty synqor offers a t hree ( 3 ) year limited warranty. complete warranty information is listed on our website or is available upon request from synqor. information furnished by synqor is believed to be accurate and reliable. however, no responsibility is assumed by synqor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of synqor. product family package size performance level thermal design output current 6/6 rohs options (see ordering information) input voltage output voltage contact synqor for further information: phone : 978-849-0600 toll free : 888-567-9596 fax : 978-849-0602 e-mail : power@synqor.com web : www.synqor.com address : 155 swanson road boxborough, ma 01719 usa pq 50 050 h p b 50 n n s - g model number input voltage output voltage max output current PQ50050HPB50nns 44-52v 5.0v 50a the following options must be included in place of the the following options must be included in place of the options description: w x y z thermal design enable logic pin style feature set b - baseplated n - negative n - 0.145" s - standard patents synqor holds the following u.s. patents, one or more of which synqor holds the following u.s. patents, one or more of which apply to each product listed in this document. additional patent apply to each product listed in this document. additional patent applications may be pending or filed in the future. 5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146 7,119,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702

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