View MQFL-28E-05D-X-HB_6848538.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 1 mqfl-28e-05d dual output mqfl-28e-05d-y-es 28vin 5.0vout@24a dc-dc converter +vin in rtn case ena 1 sync out sync in ena 2 share trim -vout out rtn +vout s/ n 0000000 d/c 3205-301 cage 120wx10 the milqor ? series of high-reliability dc-dc converters brings synqors field proven high-efficiency synchronous rectifier technology to the military/aerospace industry. synqors innovative qorseal tm packaging approach ensures survivability in the most hostile environments. compatible with the industry standard format, these converters oper - ate at a fixed frequency, have no opto-isolators, and follow conservative component derating guidelines. they are designed and manufactured to comply with a wide range of military standards. h ig h r eliability dc-dc c onve r te r f ull p owe r o p e r ation : -55oc to +125oc features mqfl series converters (with mqme filter) are designed to meet: specification compliance mqfl series converters are: design process mqfl series converters are qualified to: qualification process in-line manufacturing process d esigned & m anufactured in the usa f eaturing q or s eal ? h i -r el a ssembly ? designed for reliability per navso-p3641-a guidelines ? designed with components derated per: mil-hdbk-1547a navso p-3641a ? mil-std-810f consistent with rtca/d0-160e ? synqors first article qualifcation consistent with mil-std-883f ? synqors long-term storage survivability qualifcation ? synqors on-going life test ? as9100 and iso 9001:2000 certifed facility ? full component traceability ? temperature cycling ? constant acceleration ? 24, 96, 160 hour burn-in ? three level temperature screening ? mil-hdbk-704-8 (a through f) ? rtca/do-160 section 16 ? mil-std-1275 ? def-stan 61-5 (part 6)/5 ? mil-std-461 (c, d, e) ? rtca/do-160 section 22 ? fixed switching frequency ? no opto-isolators ? parallel operation with current share ? clock synchronization ? primary and secondary referenced enable ? continuous short circuit and overload protection ? input under-voltage and over-voltage shutdown ? output voltage trim 16-70v 16-80v 5.0v 24a 90% @ 12a / 88% @ 24a continuous input transient input output total output effciency
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 2 technical specification block diagram typical connection diagram isolation stage negative output regulation stage 7 8 uvlo ovsd secondary control gate drivers control power primary control positive input input return case enable 1 sync output sync input 12 11 10 9 1 2 3 4 5 6 positive output output return share enable 2 trim gate drivers magnetic data coupling i s o l a t i o n b a r r i e r current limit current sense bias power transformer t 1 t 2 t 1 t 2 t 1 t 2 positive output mqfl + vin in rtn case ena 1 sync out sync in ena 2 share trim - vout out rtn + vout 1 2 3 4 5 6 12 11 10 9 8 7 load + + 28 vdc open means on load + open means on - - - - - - - output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 3 technical specification mqfl-28e-05d electrical characteristics parameter min. typ. max. units notes & conditions group a vin=28v dc 5%, +iout = -iout = 12a, cl=0f, free running (see note 10) unless otherwise specifed subgroup (see note 14) absolute maximum ratings input voltage non-operating 100 v operating 100 v see note 1 reverse bias (tcase = 125oc) -0.8 v reverse bias (tcase = -55oc) -1.2 v isolation voltage input/output to case, input to output continuous -500 500 v transient (100s) -800 800 v operating case temperature -55 135 c see note 2 storage case temperature -65 135 c lead temperature (20s) 300 c voltage at ena1, ena2 -1.2 50 v input characteristics operating input voltage range (continuous) 16 28 70 v 1, 2, 3 operating input voltage range (transient, 1s) 16 28 80 v 4, 5, 6 input under-voltage lockout see note 3 turn-on voltage threshold 14.75 15.50 16.00 v 1, 2, 3 turn-off voltage threshold 13.80 14.40 15.00 v 1, 2, 3 lockout voltage hysteresis 0.50 1.10 1.80 v 1, 2, 3 input over-voltage shutdown see note 16 turn-off voltage threshold 90.0 95.0 100.0 v 1, 2, 3 turn-on voltage threshold 82.0 86.0 90.0 v 1, 2, 3 shutdown voltage hysteresis 3.0 9.0 15.0 v 1, 2, 3 maximum input current 9.5 a vin = 16v; +iout = -iout = 12a 1, 2, 3 no load input current (operating) 110 160 ma 1, 2, 3 disabled input current (ena1) 2 5 ma vin = 16v, 28v, 70v 1, 2, 3 disabled input current (ena2) 25 50 ma vin = 16v, 28v, 70v 1, 2, 3 input terminal current ripple (peak to peak) 40 60 ma bandwidth = 100khz C 10mhz; see figure 20 1, 2, 3 output characteristics output voltage set point (tcase = 25oc) see note 12 positive output 4.95 5.00 5.05 v 1 negative output -5.05 -5.00 -4.95 v 1 output voltage set point over temperature see note 12 positive output 4.90 5.00 5.10 v 2, 3 negative output -5.10 -5.00 -4.90 v 2, 3 positive output voltage line regulation -20 0 20 mv vin = 16v, 28v, 70v; see note 12 1, 2, 3 positive output voltage load regulation 15 32 50 mv +vout@(+iout= -iout=0a) - +vout@(+iout= -iout=12a); see note 12 1, 2, 3 total positive output voltage range 4.90 5.00 5.10 v see note 12 1, 2, 3 output voltage cross regulation 100 200 350 mv -vout@(+iout= -iout=4.8a) - -vout@(+iout=19.2a, -iout=4.8a); see notes 11,12 1, 2, 3 output voltage ripple and noise peak to peak 15 60 mv bandwidth = 100khz - 10mhz; c l =11f on both outputs 1, 2, 3 total operating current range 0 24 a (+iout) + (-iout) 1, 2, 3 single output operatin current range 0 19 a maximum +iout or -iout 1, 2, 3 operating output power range 0 120 w total on both outputs 1, 2, 3 output dc current-limit inception 25 28 31 a +iout + -iout; +iout = -iout; see note 4 1, 2, 3 short circuit output current 26 30 34 a +vout 1.2v 1, 2, 3 back-drive current limit while enabled 8 a 1, 2, 3 back-drive current limit while disabled 10 60 ma 1, 2, 3 maximum output capacitance 10,000 f total on both outputs; see note 5 see note 5 dynamic characteristics output voltage deviation load transient see note 6 for a pos. step change in load current -500 -300 mv total iout step = 12a?-?24a, 2.4a?-?12a; cl=11f on both outputs 4, 5, 6 for a neg. step change in load current 300 500 mv 4, 5, 6 settling time (either case) 50 200 s see note 7 4, 5, 6 output voltage deviation line transient see note 8 for a pos. step change in line voltage -500 500 mv vin step = 16v ?-? 50v; cl=11f on both output 4, 5, 6 for a neg. step change in line voltage -500 500 mv 4, 5, 6 settling time (either case) 250 500 s see note 7 see note 5 turn-on transient output voltage rise time 6 10 ms +vout = 0.5v-?4.5v 4, 5, 6 output voltage overshoot 0 2 % see note 5 turn-on delay, rising vin 5.5 8.0 ms ena1, ena2 = 5v; see note 9 4, 5, 6 turn-on delay, rising ena1 3.0 6.0 ms ena2 = 5v 4, 5, 6 turn-on delay, rising ena2 1.5 3.0 ms ena1 = 5v 4, 5, 6 output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 4 technical specification mqfl-28e-05d electrical characteristics (continued) parameter min. typ. max. units notes & conditions group a vin=28v dc 5%, +iout = -iout = 12a, cl=0f, free running (see note 10) unless otherwise specifed subgroup (see note 14) efficiency iout = 24a (16vin) 83 88 % 1, 2, 3 iout = 12a (16vin) 87 90 % 1, 2, 3 iout = 24a (28vin) 83 88 % 1, 2, 3 iout = 12a (28vin) 86 89 % 1, 2, 3 iout = 24a (40vin) 82 87 % 1, 2, 3 iout = 12a (40vin) 85 88 % 1, 2, 3 iout = 24a (70vin) 79 84 % 1, 2, 3 load fault power dissipation 16 32 w iout at current limit inception point; see note 4 1, 2, 3 short circuit power dissipation 24 33 w +vout +1.2v; -vout -1.2v 1, 2, 3 isolation characteristics isolation voltage (dielectric strength) input rtn to output rtn 500 v 1 any input pin to case 500 v 1 any output pin to case 500 v 1 isolation resistance (input rtn to output rtn) 100 m 1 isolation resistance (any pin to case) 100 m 1 isolation capacitance (input rtn to output rtn) 44 nf 1 feature characteristics switching frequency (free running) 500 550 600 khz 1, 2, 3 synchronization input frequency range 500 700 khz 1, 2, 3 logic level high 2.0 10 v 1, 2, 3 logic level low -0.5 0.8 v 1, 2, 3 duty cycle 20 80 % see note 5 synchronization output pull down current 20 ma vsync out = 0.8v see note 5 duty cycle 25 75 % output connected to sync in of other mqfl unit see note 5 enable control (ena1 and ena2) off-state voltage 0.8 v 1, 2, 3 module off pulldown current 80 a current drain required to ensure module is off see note 5 on-state voltage 2 v 1, 2, 3 module on pin leakage current 20 a imax drawn from pin allowed, module on see note 5 pull-up voltage 3.2 4.0 4.5 v see figure a 1, 2, 3 output voltage trim range -0.4 0.5 v (+vout) - 5v; see figure e see note 5 reliability characteristics calculated mtbf (mil-std-217f2) gb @ tcase = 70oc 2800 10 3 hrs. aif @ tcase = 70oc 420 10 3 hrs. weight characteristics device weight 79 g electrical characteristics notes 1. converter will undergo input over-voltage shutdown. 2. derate output power for continuous operation per figure 11. 3. high or low state of input voltage must persist for about 200s to be acted on by the lockout or shutdown circuitry. 4. current limit inception is defned as the point where the output voltage has dropped to 90% of its nominal value. 5. parameter not tested but guaranteed to the limit specifed. 6. load current transition time 10s. 7. settling time measured from start of transient to the point where the output voltage has returned to 1% of its fnal value. 8. line voltage transition time 100s. 9. input voltage rise time 250s. 10. operating the converter at a synchronization frequency above the free running frequency will cause the converters effciency to be slightly reduced and it may also cause a slight reduction in the maximum output current/power available. for more information consult the factory. 11. the regulation stage operate to control the positive output. the negative output displays cross regulation. 12. all +vout and -vout voltage measurements are made with kelvin probes on the output leads. 13. share pin outputs a power failure warning pulse during a fault condition. see current share section. 14. only the es and hb grade products are tested at three temperatures. the c grade products are tested at one temperature. please refer to the construction and environmental stress screening options table for details. 15. these derating curves apply for the es- and hb- grade products. the c- grade product has a maximum case temperature of 100oc. 16. input over voltage shutdown test is run at no load, full load is beyond derating condition and could cause damage at 125oc. output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 5 output: current: 5.0v 24a total mqfl-28e-05d figures 60 65 70 75 80 85 90 95 100 0 12 24 36 48 60 72 84 96 108 120 total output power (w) efficiency (%) 16 vin 28 vin 40 vin 70 vin 0 4 8 12 16 20 24 0 12 24 36 48 60 72 84 96 108 120 total output power (w) power dissipation (w) 16 vin 28 vin 40 vin 70 vin 60 65 70 75 80 85 90 95 100 19.2/0 16.8/2.4 14.4/4.8 12/7.2 9.6/9.6 7.2/12 4.8/14.4 2.4/16.8 0/19.2 load current (a), +iout / -iout efficiency (%) 16 vin 28 vin 40 vin 70 vin 0 4 8 12 16 20 24 19.2/0 16.8/2.4 14.4/4.8 12/7.2 9.6/9.6 7.2/12 4.8/14.4 2.4/16.8 0/19.2 load current (a), +iout / -iout power dissipation (w) 16 vin 28 vin 40 vin 70 vin 60 65 70 75 80 85 90 95 100 - 55 oc 25 oc 125 oc case temperature ( oc ) efficiency (%) 16 vin 28 vin 40 vin 70 vin 4 8 12 16 20 24 - 55 oc 25 oc 125 oc case temperature ( oc ) power dissipation (w) 16 vin 28 vin 40 vin 70 vin figure 1 : effciency vs. output power, from zero load to full load with equal load on the +5v and -5v outputs at minimum, nominal, and maximum input voltage at 25c. figure 2 : power dissipation vs. output power, from zero load to full load with equal load on the +5v and -5v outputs at minimum, nominal, and maximum input voltage at 25c. figure 3 : effciency vs. output current, with total output current fxed at 80% load (96w) and loads split as shown between the +5v and -5v outputs at minimum, nominal, and maximum input voltage at 25c. figure 4 : power dissipation vs. output current, with total output current fxed at 80% load (96w) and loads split as shown between the +5v and -5v outputs at minimum, nominal, and max input voltage at 25c. figure 5 : effciency at 60% load (7.2a load on +5v and 7.2a load on -5v) versus case temperature for vin = 16v, 28v, 40v, and 70v. figure 6 : power dissipation at 60% load (7.2a load on +5v and 7.2a load on -5v) versus case temperature for vin =16v, 28v, 40v, and 70v.
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 6 output: current: 5.0v 24a total mqfl-28e-05d figures 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 19.4/4.8 14.4/9.6 12/12 9.6/14.4 4.8/19.2 +i out (a) / -i out (a) positive output (v) -5.25 -5.20 -5.15 -5.10 -5.05 -5.00 -4.95 -4.90 -4.85 -4.80 -4.75 negative output (v) +vout -vout input voltage has virtually no effect on cross regulation 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 19.6/0 16.8/2.4 14.4/4.8 12/7.2 9.6/9.6 7.2/12 4.8/14.4 2.4/16.8 0/19.2 +i out (a) / -i out (a) positive output (v) -5.3 -5.2 -5.1 -5.0 -4.9 -4.8 -4.7 -4.6 negative output (v) +vout -vout input voltage has virtually no effect on cross regulation 4.70 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 0 24 48 72 96 120 total output power (w) positive output (v) -5.10 -5.05 -5.00 -4.95 -4.90 -4.85 -4.80 -4.75 -4.70 negative output (v) +vout -vout input voltage has virtually no effect on cross regulation 4.8 4.9 4.9 5.0 5.0 5.1 5.1 5.2 5.2 0 24 48 72 96 120 total output power (w) positive output (v) -5.20 -5.15 -5.10 -5.05 -5.00 -4.95 -4.90 -4.85 -4.80 negative output (v) +vout -vout input voltage has virtually no effect on cross regulation 0 6 12 18 24 30 25 35 45 55 65 75 85 95 105 115 125 135 145 case temperature ( oc ) iout (a) 0 30 60 90 120 150 tmax = 105 oc , vin = 70 tmax = 105 oc , vin = 50 tmax = 105 oc , vin = 28 tmax = 125 oc , vin = 70 tmax = 125 oc , vin = 50 tmax = 125 oc , vin = 28 tmax = 145 oc , vin = 50 tmax = 145 oc , vin = 28 pout (w) 0 1 2 3 4 5 6 0 5 10 15 20 25 30 load current (a) output voltage (v) figure 7 : load regulation vs. load current with power fxed at full load (120w) and load currents split as shown between the +5v and -5v outputs, at nominal input voltage and tcase = 25oc. figure 8 : load regulation vs. load current with power fxed at 80% load (96w) and load currents split as shown between the +5v and -5v outputs, at nominal input voltage and tcase = 25oc. figure 9 : load regulation vs. total output power from zero to to full load where +iout equals three times -iout at nominal input voltage and tcase = 25oc. figure 10 : load regulation vs. total output power from zero to to full load where -iout equals three times +iout at nominal input voltage and tcase = 25oc. figure 11 : total output current / total output power derating curve as a function of tcase and the maximum desired power mosfet junction temperature (see note 15). figure 12 : positive output voltage vs. total load current, evenly split, showing typical current limit curves at vin = 28v.
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 7 figures figure 13 : turn-on transient at full rated load current (resistive load) (5 ms/div). input voltage pre-applied. ch 1: +vout (2v/div); ch 2: -vout (2v/div); ch 3: enable1 input (5v/div). figure 14 : turn-on transient at zero load current (5ms/div). input voltage pre-applied. ch 1: +vout (2v/div); ch 2: -vout (2v/div); ch 3: enable1 input (5v/div). figure 15 : turn-on transient at full rated load current (resistive load) (5ms/div). input voltage pre-applied. ch 1: +vout (2v/div); ch 2: -vout (2v/div); ch 3: enable2 input (5v/div). figure 16 : turn-on transient at full load, after application of input voltage (ena 1 and ena 2 logic high) (5ms/div). ch 1: +vout (2v/ div); ch 2: -vout (2v/div); ch 3: vin (10v/div). figure 17 : output voltage response to step-change in total load current (50%-100%-50%) of total iout (max) split 50%/50%. load cap: 1f ceramic cap and 10f, 100m esr tantalum cap. ch 1: +vout (500mv/div); ch 2: +iout (10a/div); ch 3: -vout (500mv/div); ch 4: -iout (10a/div). figure 18 : output voltage response to step-change in total load current (0%-50%-0%) of total iout (max) split 50%/50%. load cap: 1f ceramic cap and 10f, 100m esr tantalum cap. ch 1: +vout (500mv/div); ch 2: +iout (10a/div); ch 3: -vout (500mv/div); ch 4: -iout (10a/div). output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 8 figures figure 19 : output voltage response to step-change in input voltage (16v - 50v - 16v). load cap: 10f, 100m esr tantalum cap and 1f ceramic cap. ch 1: +vout (500mv/div); ch 2: -vout (500mv/div); ch 3: vin (20v/div). figure 20 : test set-up diagram showing measurement points for input terminal ripple current (figure 21) and output voltage ripple (figure 22). figure 21 : input terminal current ripple, ic, at full rated output current and nominal input voltage with synqor mq flter module (50ma/div). bandwidth: 20mhz. see figure 20. figure 22 : output voltage ripple, +vout (ch 1) and -vout (ch 2), at nominal input voltage and full load current evenly split (20mv/ div). load capacitance: 1f ceramic cap and 10f tantalum cap. bandwidth: 10mhz. see figure 20. figure 23 : rise of output voltage after the removal of a short circuit across the positive output terminals. ch 1: +vout (2v/div); ch 2: -vout (2v/div); ch 3: +iout (20a/div). figure 24 : sync out vs. time, driving sync in of a second synqor mqfl converter. output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 9 output: current: 5.0v 24a total mqfl-28e-05d figures -50 -40 -30 -20 -10 0 10 10 100 1,000 10,000 100,000 hz reverse transmission (db) 16vin 28vin 40vin -50 -40 -30 -20 -10 0 10 10 100 1,000 10,000 100,000 hz reverse transmission (db) 16vin 28vin 40vin 0.0001 0.001 0.01 0.1 10 100 1,000 10,000 100,000 hz output impedance (ohms) 16vin 28vin 40vin 0.0001 0.001 0.01 0.1 10 100 1,000 10,000 100,000 hz output impedance (ohms) 16vin 28vin 40vin -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 100 1,000 10,000 100,000 hz forward transmission (db) 16vin 28vin 40vin -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 100 1,000 10,000 100,000 hz forward transmission (db) 16vin 28vin 40vin figure 25 : magnitude of incremental output impedance of +5v output (+zout = +vout /+iout) for minimum, nominal, and maximum input voltage at full rated power. figure 26 : magnitude of incremental output impedance of -5v output (-zout = -vout /-iout) for minimum, nominal, and maximum input voltage at full rated power. figure 27 : magnitude of incremental forward transmission of +5v output (+ft = +vout /vin) for minimum, nominal, and maximum input voltage at full rated power. figure 28 : magnitude of incremental forward transmission of -5v output (-ft = -vout /vin) for minimum, nominal, and maximum input voltage at full rated power. figure 29 : magnitude of incremental reverse transmission from +5v output (+rt = iin /+iout) for minimum, nominal, and maximum input voltage at full rated power. figure 30 : magnitude of incremental reverse transmission from -5v output (-rt = iin /-iout) for minimum, nominal, and maximum input voltage at full rated power.
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 10 output: current: 5.0v 24a total mqfl-28e-05d figures 0.01 0.1 1 10 100 10 100 1,000 10,000 100,000 hz input impedance (ohms) 16vin 28vin 40vin figure 31 : magnitude of incremental input impedance (zin = vin/ iin) for minimum, nominal, and maximum input voltage at full rated power with 50% / 50% split. figure 32 : high frequency conducted emissions of standalone mqfl-28-05s, 5vout module at 120w output, as measured with method ce102. limit line shown is the basic curve for all applications with a 28v source. figure 33 : high frequency conducted emissions of mqfl-28-05s, 5vout module at 120w output with mqfl-28-p flter, as measured with method ce102. limit line shown is the basic curve for all applications with a 28v source.
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 11 output: current: 5.0v 24a total mqfl-28e-05d application section basic operation and features the mqfl dc/dc converter uses a two-stage power conversion topology. the first, or regulation, stage is a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. the second, or isolation, stage uses trans - formers to provide the functions of input/output isolation and voltage transformation to achieve the output voltage required. in the dual output converter there are two secondary windings in the transformer of the isolation stage, one for each output. there is only one regulation stage, however, and it is used to control the positive output. the negative output therefore displays cross-regulation, meaning that its output voltage depends on how much current is drawn from each output. both the positive and the negative outputs share a common output return pin. both the regulation and the isolation stages switch at a fixed frequency for predictable emi performance. the isolation stage switches at one half the frequency of the regulation stage, but due to the push-pull nature of this stage it creates a ripple at double its switching frequency. as a result, both the input and the output of the converter have a fundamental ripple frequency of about 550 khz in the free-running mode. rectification of the isolation stages output is accomplished with synchronous rectifiers. these devices, which are mosfets with a very low resistance, dissipate far less energy than would schottky diodes. this is the primary reason why the mqfl converters have such high efficiency, particularly at low output voltages. besides improving efficiency, the synchronous rectifiers permit operation down to zero load current. there is no longer a need for a minimum load, as is typical for converters that use diodes for rectification. the synchronous rectifiers actually permit a negative load current to flow back into the converters output terminals if the load is a source of short or long term energy. the mqfl converters employ a back-drive current limit to keep this negative output terminal current small. there is a control circuit on both the input and output sides of the mqfl converter that determines the conduction state of the power switches. these circuits communicate with each other across the isolation barrier through a magnetically coupled device. no opto-isolators are used. a separate bias supply provides power to both the input and output control circuits. among other things, this bias supply permits the converter to operate indefinitely into a short circuit and to avoid a hiccup mode, even under a tough start-up condi - tion. an input under-voltage lockout feature with hysteresis is pro - vided, as well as an input over-voltage shutdown. there is also an output current limit that is nearly constant as the load imped - ance decreases to a short circuit (i.e., there is not fold-back or fold-forward characteristic to the output current under this condition). when a load fault is removed, the output voltage rises exponentially to its nominal value without an overshoot. the mqfl converters control circuit does not implement an out - put over-voltage limit or an over-temperature shutdown. the following sections describe the use and operation of addi - tional control features provided by the mqfl converter. control features enable: the mqfl converter has two enable pins. both must have a logic high level for the converter to be enabled. a logic low on either pin will inhibit the converter. the ena1 pin (pin 4) is referenced with respect to the convert - ers input return (pin 2). the ena2 pin (pin 12) is referenced with respect to the converters output return (pin 8). this per - mits the converter to be inhibited from either the input or the output side. regardless of which pin is used to inhibit the converter, the regulation and the isolation stages are turned off. however, when the converter is inhibited through the ena1 pin, the bias supply is also turned off, whereas this supply remains on when the converter is inhibited through the ena2 pin. a higher input standby current therefore results in the latter case. both enable pins are internally pulled high so that an open con - nection on both pins will enable the converter. figure a shows the equivalent circuit looking into either enable pins. it is ttl compatible. 2 n 3904 1 n 4148 250 k 125 k 82 k 5 . 6 v to enable circuitry pin 4 ( or pin 12 ) pin 2 ( or pin 8 ) in rtn enable figure a: circuit diagram shown for reference only, actual circuit components may differ from values shown for equivalent circuit.
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 12 application section synchronization: the mqfl converters switching fre - quency can be synchronized to an external frequency source that is in the 500 khz to 700 khz range. a pulse train at the desired frequency should be applied to the sync in pin (pin 6) with respect to the input return (pin 2). this pulse train should have a duty cycle in the 20% to 80% range. its low value should be below 0.8v to be guaranteed to be interpreted as a logic low, and its high value should be above 2.0v to be guaranteed to be interpreted as a logic high. the transition time between the two states should be less than 300ns. if the mqfl converter is not to be synchronized, the sync in pin should be left open circuit. the converter will then operate in its free-running mode at a frequency of approximately 550 khz. if, due to a fault, the sync in pin is held in either a logic low or logic high state continuously, the mqfl converter will revert to its free-running frequency. the mqfl converter also has a sync out pin (pin 5). this output can be used to drive the sync in pins of as many as ten (10) other mqfl converters. the pulse train coming out of sync out has a duty cycle of 50% and a frequency that matches the switching frequency of the converter with which it is associated. this frequency is either the free-running fre - quency if there is no synchronization signal at the sync in pin, or the synchronization frequency if there is. the sync out signal is available only when the dc input volt - age is above approximately 12v and when the converter is not inhibited through the ena1 pin. an inhibit through the ena2 pin will not turn the sync out signal off. note: an mqfl converter that has its sync in pin driven by the sync out pin of a second mqfl converter will have its start of its switching cycle delayed approximately 180 degrees rela - tive to that of the second converter. figure b shows the equivalent circuit looking into the sync in pin. figure c shows the equivalent circuit looking into the sync out pin. figure b: equivalent circuit looking into the sync in pin with respect to the in rtn (input return) pin. pin 2 pin 6 5 k 5 v sync in in rtn to sync circuitry 5 k current share: when several mqfl converters are placed in parallel to achieve either a higher total load power or n+1 redundancy, their share pins (pin 11) should be connected together. the voltage on this common share node represents the average current delivered by all of the paralleled converters. each converter monitors this average value and adjusts itself so that its output current closely matches that of the average. since the share pin is monitored with respect to the output return (pin 8) by each converter, it is important to connect all of the converters output return pins together through a low dc and ac impedance. when this is done correctly, the converters will deliver their appropriate fraction of the total load current to within +/- 10% at full rated load. whether or not converters are paralleled, the voltage at the share pin could be used to monitor the approximate aver - age current delivered by the converter(s). a nominal voltage of 1.0v represents zero current and a nominal voltage of 2.2v represents the maximum rated current, with a linear relationship in between. the internal source resistance of a converters share pin signal is 2.5 k w . during an input voltage fault or primary disable event, the share pin outputs a power failure warning pulse. the share pin will go to 3v for approximately 14ms as the output voltage falls. note: converters operating from separate input filters with reverse polarity protection (such as the mqme-28-t filter) with their outputs connected in parallel may exhibit hiccup operation at light loads. consult factory for details. figure c: equivalent circuit looking into sync out pin with respect to the in rtn (input return) pin. from sync circuitry 5 k 5 v sync out in rtn pin 2 pin 5 open collector output output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 13 application section output voltage trim: if desired, it is possible to increase the mqfl dual converters output voltage above its nominal value. to increase the output voltage a resistor, rup, should be connected between the trim pin (pin 10) and the output return pin (pin 8), as shown in figure d. the value of this resistor should be determined according to the following equa - tion: rup = 10 x ( vnom C 2.5 C 2 x vnom + 5 ) vout C vnom where: vnom = the converters nominal output voltage, vout = the desired output voltage (greater than vnom), and rup is in kiloohms (k w) . the maximum value of output voltage that can be achieved is 0.5v above the nominal output. to decrease the output voltage a resistor, rdown, should be connected between the trim pin and the positive output pin (pin 7), as shown in figure d. the value of this resistor should be determined according to the following equation: rdown = 10 x [ vnom C 1 ] x [ vnom C 2.5 C 5 ] 2.5 vnom C vout where: vnom = the converters nominal output voltage, vout = the desired output voltage (less than vnom), and rdown is in kiloohms (k w) . as the output voltage is trimmed up, it produces a greater voltage stress on the converters internal components and may cause the converter to fail to deliver the desired output voltage at the low end of the input voltage range at the higher end of the load current and temperature range. please consult the factory for details. factory trimmed converters are available by request. input under-voltage lockout: the mqfl converter has an under-voltage lockout feature that ensures the converter will be off if the input voltage is too low. the threshold of input voltage at which the converter will turn on is higher that the threshold at which it will turn off. in addition, the mqfl con - verter will not respond to a state of the input voltage unless it has remained in that state for more than about 200 s. this hys - teresis and the delay ensure proper operation when the source impedance is high or in a noisy environment. input over-voltage shutdown: the mqfl converter also has an over-voltage feature that ensures the converter will be off if the input voltage is too high. it also has a hysteresis and time delay to ensure proper operation. shut down: the mqfl converter will shut down in response to only four conditions: ena1 input low, ena2 input low, vin input below under-voltage lockout threshold, or vin input above over-voltage shutdown threshold. following a shutdown event, there is a startup inhibit delay which will prevent the converter from restarting for approximately 300ms. after the 300ms delay figure d: typical connection for output voltage trimming. mqfl + vin in rtn case ena 1 sync out sync in ena 2 share trim - vout out rtn + vout 1 2 3 4 5 6 12 11 10 9 8 7 load + + 28 vdc open means on load + open means on - - - - - - - r up r down 0.1 1.0 10.0 100.0 1,000.0 10,000.0 -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 change in vout (v) trim resistance (kohms) trim down configuration trim up configuration figure e: output voltage trim graph output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 14 output: current: 5.0v 24a total mqfl-28e-05d application section elapses, if the enable inputs are high and the input voltage is within the operating range, the converter will restart. if the vin input is brought down to nearly 0v and back into the operating range, there is no startup inhibit, and the output voltage will rise according to the turn-on delay, rising vin specification. back-drive current limit: converters that use mosfets as synchronous rectifiers are capable of drawing a negative cur - rent from the load if the load is a source of short- or long-term energy. this negative current is referred to as a back-drive current. conditions where back-drive current might occur include paral - leled converters that do not employ current sharing, or where the current share feature does not adequately ensure sharing during the startup or shutdown transitions. it can also occur when converters having different output voltages are connected together through either explicit or parasitic diodes that, while normally off, become conductive during startup or shutdown. finally, some loads, such as motors, can return energy to their power rail. even a load capacitor is a source of back-drive energy for some period of time during a shutdown transient. to avoid any problems that might arise due to back-drive cur - rent, the mqfl converters limit the negative current that the converter can draw from its output terminals. the threshold for this back-drive current limit is placed sufficiently below zero so that the converter may operate properly down to zero load, but its absolute value (see the electrical characteristics page) is small compared to the converters rated output current. input system instability: this condition can occur because any dc/dc converter appears incrementally as a nega - tive 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. when the converter is mounted on a metal plate, the plate will help to make the converters case bottom a uniform tempera - ture. how well it does so depends on the thickness of the plate and on the thermal conductance of the interface layer (e.g. ther - mal grease, thermal pad, etc.) between the case and the plate. unless this is done very well, it is important not to mistake the plates temperature for the maximum case temperature. it is easy for them to be as much as 5-10oc different at full power and at high temperatures. it is suggested that a thermocouple be attached directly to the converters case through a small hole in the plate when investigating how hot the converter is getting. care must also be made to ensure that there is not a large thermal resistance between the thermocouple and the case due to whatever adhesive might be used to hold the thermocouple in place. thermal considertaions: figure 11 shows the suggested power derating curves for this converter as a function of the case temperature and the maximum desired power mosfet junction temperature. all other components within the converter are cooler than its hottest mosfet. the mil-hdbk-1547a component derating guideline calls for a maximum component temperature of 105oc. figure 11 therefore has one power derating curve that ensures this limit is maintained. it has been synqors extensive experience that reliable long-term converter operation can be achieved with a maximum component temperature of 125oc. in extreme cases, a maximum temperature of 145oc is permissible, but not recommended for long-term operation where high reliability is required. derating curves for these higher temperature limits are also included in figure 11. the maximum case temperature at which the converter should be operated is 135oc.
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 15 stress screening construction and environmental stress screening options milqor converters and filters are offered in three variations of environmental stress screening options. all milqor converters use synqors proprietary qorseal? hi-rel assembly process that includes a parylene-c coating of the circuit, a high performance thermal compound filler, and a nickel barrier gold plated aluminum case. each successively higher grade has more stringent mechanical and electrical testing, as well as a longer burn-in cycle. the es- and hb-grades are also constructed of components that have been procured through an element evaluation process that pre-qualifies each new batch of devices. screening consistent with mil-std-883f c-grade (-40 oc to +100 oc) es-grade (-55 oc to +125 oc) (element evaluation) hb-grade (-55 oc to +125 oc) (element evaluation) internal visual * yes yes yes temperature cycle method 1010 no condition b (-55 oc to +125 oc) condition c (-65 oc to +150 oc) constant acceleration method 2001 (y1 direction) no 500g condition a (5000g) burn-in method 1015 load cycled ? 10s period ? 2s @ 100% load ? 8s @ 0% load 24 hrs @ +125 oc 96 hrs @ +125 oc 160 hrs @ +125 oc final electrical test method 5005 (group a) +25 oc -45, +25, +100 oc -55, +25, +125 oc mechanical seal, thermal, and coating process full qorseal full qorseal full qorseal external visual 2009 * yes yes construction process qorseal qorseal qorseal * per ipc-a-610 class 3 output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 16 mechanical diagrams made in usa 1 2 3 4 5 6 12 11 10 9 8 7 1.260 [32.00] 1.50 [32.10] 0.28 [3.25] 0.220 [5.59] 0.42 [10.7] 0.050 [1.27] 0.040 [1.02] pin 0.200 [5.08] typ. non-cum. 0.250 [6.35] 0.390 [9.91] 2.50 [63.50] 2.76 [70.10] 3.00 [76.20] see note 7 s/n 0000000 d/c 3205-301 cage 1wx10 2.80 [71.1] made in usa 1 2 3 4 5 6 12 11 10 9 8 7 1.260 [32.00] 1.50 [32.10] 0.28 [3.25] 0.228 [5.79] 0.220 [5.59] 0.050 [1.27] 0.220 [5.59] pin 0.200 [5.08] typ. non-cum. 0.250 [6.35] 0.390 [9.91] 2.50 [63.50] 2.76 [70.10] 3.00 [76.20] 2.96 [75.2] s/n 0000000 d/c 3205-301 cage 1wx10 see note 7 case x case u pin designations pin # function pin # function 1 positive input 7 positive output 2 input return 8 output return 3 case 9 negative output 4 enable 1 10 trim 5 sync output 11 share 6 sync input 12 enable 2 notes 1) pins 0.040 (1.02mm) diameter 2) pins material: copper finish: copper alloy with gold over nickel plating, followed by sn/pb solder dip 3) all dimensions in inches (mm) tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 4) weight: 2.8 oz (78.5 g) typical 5) workmanship: meets or exceeds ipc-a-610 class iii 6) print labeling on top surface per product label format drawing 7) pin 1 identifcation hole, not intended for mounting +vin ena 2 in rtn share case trim ena 1 -vout sync out out rtn sync in +vout +vin ena 2 in rtn share case trim ena 1 -vout sync out out rtn sync in +vout mqfl-28e-05d-x-es dc-dc converter 28v in 5.0v out @ 24a mqfl-28e-05d-u-es dc-dc converter 28v in 5.0v out @ 24a output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 17 mechanical diagrams 1 2 3 4 5 6 12 11 10 9 8 7 1.750 [44.45] 1.50 [38.10] 0.228 [5.79] 0.300 [7.62] 0.140 [3.56] 0.220 [5.59] 0.050 [1.27] 0.040 [1.02] pin 0.200 [5.08] typ. non-cum. 0.250 [6.35] 0.250 [6.35] typ 0.375 [9.52] 2.50 [63.50] 2.96 [75.2] 0.390 [9.91] 2.00 [50.80] 1.15 [29.21] 1.750 [44.45] s/n 0000000 d/c 3205-301 cage 1wx10 made in usa 0.390 [9.91] 0.050 [1.27] 0.36 [9.14] 0.250 [6.35] 0.220 [5.59] 0.420 [10.7] 2.80 [71.1] 0.525 [13.33] 0.040 [1.02] pin 0.200 [5.08] typ. non-cum. 0.390 [9.91] 0.050 [1.27] 0.250 [6.35] 0.220 [5.59] 0.420 [10.7] 2.80 [71.1] 0.525 [13.33] 0.040 [1.02] pin 0.200 [5.08] typ. non-cum. case y case z (variant of y) case w (variant of y) pin designations pin # function pin # function 1 positive input 7 positive output 2 input return 8 output return 3 case 9 negative output 4 enable 1 10 trim 5 sync output 11 share 6 sync input 12 enable 2 notes 1) pins 0.040 (1.02mm) diameter 2) pins material: copper finish: copper alloy with gold over nickel plating, followed by sn/pb solder dip 3) all dimensions in inches (mm) tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 4) weight: 2.8 oz (78.5 g) typical 5) workmanship: meets or exceeds ipc-a-610 class iii 6) print labeling on top surface per product label format drawing 7) pin 1 identifcation hole, not intended for mounting +vin ena 2 in rtn share case trim ena 1 -vout sync out out rtn sync in +vout mqfl-28e-05d-y-es dc-dc converter 28v in 5.0v out @ 24a output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 18 ordering information milqor converter family matrix the tables below show the array of milqor converters available. when ordering synqor converters, please ensure that you use the complete part number according to the table in the last page. contact the factory for other requirements. single output dual output ? full size 1.5v 1.8v 2.5v 3.3v 5v 6v 7.5v 9v 12v 15v 28v 5v 12v 15v (1r5s) (1r8s) (2r5s) (3r3s) (05s) (06s) (7r5s) (09s) (12s) (15s) (28s) (05d) (12d) (15d) mqfl-28 40a 40a 40a 30a 24a 20a 16a 13a 10a 8a 4a 24a total 10a total 8a total 16-40vin cont. 16-50vin 1s trans.* absolute max vin = 60v mqfl-28e 40a 40a 40a 30a 24a 20a 16a 13a 10a 8a 4a 24a total 10a total 8a total 16-70vin cont. 16-80vin 1s trans.* absolute max vin =100v mqfl-28v 40a 40a 40a 30a 20a 17a 13a 11a 8a 6.5a 3.3a 20a total 8a total 6.5a total 16-40vin cont. 5.5-50vin 1s trans.* absolute max vin = 60v mqfl-28ve 40a 40a 40a 30a 20a 17a 13a 11a 8a 6.5a 3.3a 20a total 8a total 6.5a total 16-70vin cont. 5.5-80vin 1s trans.* absolute max vin = 100v mqfl-270 40a 40a 40a 30a 24a 20a 16a 13a 10a 8a 4a 24a total 10a total 8a total 155-400vin cont. 155-475vin 1s trans.* absolute max vin = 550v single output dual output ? half size 1.5v 1.8v 2.5v 3.3v 5v 6v 7.5v 9v 12v 15v 28v 5v 12v 15v (1r5s) (1r8s) (2r5s) (3r3s) (05s) (06s) (7r5s) (09s) (12s) (15s) (28s) (05d) (12d) (15d) mqhl-28 20a 20a 20a 15a 10a 8a 6.6a 5.5a 4a 3.3a 1.8a 10a total 4a total 3.3a total 16-40vin cont. 16-50vin 1s trans.* absolute max vin = 60v mqhl-28e 20a 20a 20a 15a 10a 8a 6.6a 5.5a 4a 3.3a 1.8a 10a total 4a total 3.3a total 16-70vin cont. 16-80vin 1s trans.* absolute max vin =100v mqhr-28 10a 10a 10a 7.5a 5a 4a 3.3a 2.75a 2a 1.65a 0.9a 5a total 2a total 1.65a total 16-40vin cont. 16-50vin 1s trans.* absolute max vin = 60v mqhr-28e 10a 10a 10a 7.5a 5a 4a 3.3a 2.75a 2a 1.65a 0.9a 5a total 2a total 1.65a total 16-70vin cont. 16-80vin 1s trans.* absolute max vin = 100v check with factory for availability. ?80% of total output current available on any one output. *converters may be operated at the highest transient input voltage, but some component electrical and thermal stresses would be beyond mil- hdbk-1547a guidelines. output: current: 5.0v 24a total mqfl-28e-05d
product # mqfl-28e-05d phone 1-888-567-9596 www.synqor.com doc.# 005-0005158 rev. a 12/03/10 page 19 ordering information model name input voltage range output voltage(s) package outline/ pin confguration screening grade single output dual output mqfl mqhl mqhr 28 28e 28v 28ve 270 1r5s 1r8s 2r5s 3r3s 05s 06s 7r5s 09s 12s 15s 28s 05d 12d 15d u x y w z c es hb warranty synqor offers a two (2) 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 : 1-888-567-9596 fax : 978-849-0602 e-mail : mqnbofae@synqor.com web : www.synqor.com address : 155 swanson road boxborough, ma 01719 usa patents synqor holds the following u.s. patents, one or more of which apply to each product listed in this document. additional patent applications may be pending or fled in the future. 5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146 7,119,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702 7,765,687 7,787,261 application notes a variety of application notes and technical white papers can be downloaded in pdf format from the synqor website. part numbering system the part numbering system for synqors milqor dc-dc converters follows the format shown in the table below. not all combinations make valid part numbers, please contact synqor for availability. see the product summary web page for more options. example: mqfl-28e-05dCyCes output: current: 5.0v 24a total mqfl-28e-05d

▲Up To Search▲

Price & Availability of MQFL-28E-05D-X-HB

	To Download MQFL-28E-05D-X-HB Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .