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www.irf.com 1 m3g-series description total dose > 200 krad(si), typically usable to > 300 krad(si) see hardened up to 82 mev . cm 2 /mg internal emi filter; converter capable of meeting mil-std-461c ce03 low weight, < 110 grams magnetically coupled feedback 18v to 50v dc input range up to 40w output power triple output models include +5v and 12v or 15v main output isolated from dual outputs high efficiency - to 80% -55c to +125c operating temperature range 100m ? @ 500vdc isolation under-voltage lockout synchronization input and output short circuit and overload protection output over voltage limiter external inhibit > 5,000,000 hour mtbf standard microcircuit drawings available features 28v input, triple output applications geostationary earth orbit satellites (geo) non-flight versions of the m3g-series converters are available for system development purposes. variations in electrical specifications and screening to meet customrequirements can be accommodated. the m3g-series of dc-dc converters are radiationhardened, high reliability converters designed for extended operation in hostile environments. their small size and low weight make them ideal for applications such as geostationary earth orbit satellites and deep space probes. they exhibit a high tolerance to total ionizing dose, single event effects and environmental stresses such as temperature extremes, mechanical shock, and vibration. the converters incorporate a fixed frequency single ended forward topology with magnetic feedback and an internal emi filter that utilizes multilayer ceramic capacitors that are subjected to extensive lot screening for optimum reliability. these converters are capable of meeting the conducted emissions and conducted susceptibility requirements of mil-std-461c without any additional components. external inhibit and synchronization input and output allow these converters to be easily incorporated into larger power systems. they are enclosed in a hermetic 3" x 2" x 0.475" package constructed of an aluminum-silicon-carbide (alsic) base and an alloy 48 ring frame and they weigh less than 110 grams. the package utilizes rugged ceramic feed-through copper core pins and is sealed using parallel seam welding. deep space satellites / probes strategic weapons and communication systems m3g hybrid-high reliabilityradiation hardened dc-dc converter manufactured in a facility fully qualified to mil-prf- 38534, these converters are fabricated utilizing dla land and maritime qualified processes. for available screening options, refer to device screening table in the data sheet. pd-94535r downloaded from: http:///
2 www.irf.com m3g-series(28v input, triple output) circuit description an internal emi filter allows the converter to meet theconducted emissions requirements of mil-std-461c on the input power leads. a two-stage output filter reduces the typical output ripple to less than 20mv peak-to-peak. an under-voltage lockout circuit prohibits theconverter from operating when the line voltage is too low to maintain the output voltage. the converter will not start until the line voltage rises to approximately 16.5 volts and will shut down when the input voltage drops below 15.5 volts. the one volt of hysteresis reduces the possibility of line noise interfering with the converters start-up and shut down. an external inhibit port is provided to control converter operation. the nominal threshold relative to the input return (pin 2) is 1.4v. if 2.0 volts or greater are applied to the inhibit pin (pin 3) then the converter will operate normally. a voltage of 0.8v or less will cause the converter to shut-down. the pin may be left open for normal operation and has a nominal open circuit voltage of 4.0v. design methodology synchronization input and output allow multipleconverters to operate at a common switching frequency. converters can be synchronized to one another or to an externally provided clock. this can be used to eliminate beat frequency noise or to avoid creating noise at certain frequencies for sensitive systems. the main (+5 volt ) output is regulated by the controlloop and typically exhibits better than 1% regulation. the auxiliary (12 volt or 15 volt) outputs are maintained through tight coupling in the power transformer and main output filter inductor and typically exhibit better than 5% regulation. the main output and auxiliary outputs are isolated from each other. output power is limited under any load fault conditionto approximately 125% of rated. an overload condition causes the converter output to behave like a constant current source with the output voltage dropping below nominal. the converter will resume normal operation when the load current is reduced below the current limit point. this protects the converter from both overload and short circuit conditions. the current limit point exhibits a slightly negative temperature coefficient to reduce the possibility of thermal runaway. the m3g-series was developed using a provenconservative design methodology which includes selecting radiation tolerant and established reliability components and fully derating to the requirements of mil-std-975 and mil-std-1547 except for the cdr type ceramic capacitors, a capacitor with 50v rating is used for in-circuit voltage stress of less than 10v. careful sizing of decoupling capacitors and current limiting resistors minimizes the possibility ofphoto-current burn-out. heavy derating of the radiation hardened power mosfet virtually eliminates the possibility of segr and seb. a magnetic feedback circuit is utilized instead of opto- couplers to minimize temperature, radiation and aging sensitivity. pspice and radspice were used extensively to predict and optimize circuit performance for both beginning and end-of-life. thorough design analyses include radiation susceptibility (tree ), worst case, stress, thermal, failure modes and effects (fmea) and reliability (mtbf). the m3g-series converters utilize a single-endedforward topology with resonant reset. the nominal switching frequency is 500khz. electrical isolation and tight output regulation are achieved through the use of a magnetically coupled feedback. voltage feed-forward with duty factor limiting provides high line rejection and protection against output over voltage in the event of an internal control loop failure. this mechanism limits the maximum output voltage to approximately 20% over the nominal regardless of the line voltage. downloaded from: http:///
www.irf.com 3 m3g-series(28v input, tripleoutput) 1 meets derating per mil-std-975 2 for operation at +125c see table note 14 electrical performance characteristics for notes to specifications, refer to page 5 specifications input voltage range -0.5vdc to +80vdc input voltage range +18vdc to +60vdc output power internally limited input voltage range 1 +18vdc to +50vdc lead temperature +300c for 10 seconds output power 0 to max. rated operating temperature -55c to +135c operating temperature 2 -55c to +125c storage temperature -55c to +135c operating temperature 1 -55c to +70c recommended operating conditions absolute maximum ratings limits parameter group a subgroup conditions -55 c t c +85 c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit input voltage (v in ) 1,2,3 note 2 18 28 50 v output voltage (v out ) (main) m3g280512t (aux.) m3g280515t (aux.) (main) m3g280512t (aux.) m3g280515t (aux.) 1 2,3 i out = 100% rated load, note 5 4.98 11.50 14.50 4.93 11.30 14.30 5.00 11.80 14.80 5.02 12.10 15.10 5.07 12.30 15.30 v output power (p out ) 1,2,3 v in = 18, 28, 50 volts, note 2 0 40 w output current (i out ) (main) m3g280512t (aux.) m3g280515t (aux.) 1,2,3 v in = 18, 28, 50 volts, notes 2, 3, 4, 5 400 83 67 4000 833 667 ma line regulation (vr line ) (main) m3g280512t (aux.) m3g280515t (aux.) 1,2,3 v in = 18, 28, 50 volts i out = 10% , 50%, 100% rated note 5 -10 -120 -300 10 120 300 mv load regulation (vr load ) (main) m3g280512t (aux.) m3g280515t (aux.) 1,2,3 i out = 10%, 50%, 100% rated v in = 18, 28, 50 volts notes 5,13 -50 -400 -600 50 400 600 mv cross regulation ( vr cross ) (main) m3g280512t (aux.) m3g280515t (aux.) 1,2,3 v in = 18, 28, 50 volts i out = 2.5a to 1a and 2.5 to 4a on main and half rated on aux. outputs -3.5 -3.5 3.5 3.5 % i out = 0, pin 3 open 80 input current (i in ) 1,2,3 pin 3 shorted to pin 2 5.0 ma downloaded from: http:///
4 www.irf.com m3g-series(28v input, triple output) electrical performance characteristics ( continued ) for notes to specifications, refer to page 5 limits parameter group a subgroup conditions -55 c t c +85 c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit output ripple (v rip ) (main) m3g280512t (aux.) m3g280515t (aux.) 1,2,3 v in = 18, 28, 50 volts i out = 100% rated load, notes 5, 6 25 30 30 50 60 75 mv p-p switching frequency (f s ) 1,2,3 sync. input (pin 4) open 450 500 550 khz efficiency (e ff ) 1,2,3 i out = 100% rated load, note 5 75 79 % inhibit input open circuit voltage drive current (sink) voltage range note 1 3.0 -0.5 5.0 100 50 v a v synchronization input frequency range pulse high level pulse low level pulse transition time pulse duty cycle ext. clock on sync. input (pin 4) note 1 450 4.0 -0.5 40 20 600 10.0 0.5 80 khz v v v/ s % current limit point expressed as a percentage of full rated output power 1,2 3 v out = 90% of nominal, note 5 135 150 % power dissipation, load fault (p d ) 1,2,3 short circuit, overload, note 8 20 w output response to step load changes (v tld ) 4,5,6 half load to/from full load, notes 5,9 -300 300 mv pk recovery time, step load changes (t tld ) 4,5,6 half load to/from full load, note 5,9,10 200 s output response to step line changes (v tln ) 18v to/from 50v i out = 100% rated load, notes 1,5,11 -300 300 mv pk recovery time, step line changes (t tln ) 18v to/from 50v i out = 100% rated load, notes 1,5,10,11 200 s turn-on response overshoot (v os ) (main) (aux.) turn-on delay (t dly ) 4,5,6 no load, full load, notes 5,12 10% of nominal 1.0 500 10 5.0 mv % ms capacitive load (c l ) (main) (each aux. output) i out = 100% rated load, no effect on dc performance, notes 1, 5, 7 1000 200 f downloaded from: http:///
www.irf.com 5 m3g-series(28v input, tripleoutput) electrical performance characteristics ( continued ) 1. parameter is tested as part of design characterization or after design changes. thereafter, parameter shall be guaranteed to the limits specified. 2. parameter verified during line and load regulation tests. 3. although operation with no load is permissible, light loading on the main (+5 volt) output may cause the output voltage of the auxiliary outputs(12 volt or 15 volt) to drop out of regulation. it is therefore recommended that at least 200 ma or 20 percent of the total output power, whichever is greater, be taken from the main (+5 volt) output. 4. although operation with no load is permissible, heavy loading on the main (+5 volt) output may cause the output voltage of the auxiliary outputs(12 volt or 15 volt) to rise out of regulation. it is therefore recommended that at least 50 ma or 20 percent of the total output power, whichever is greater, be taken from the auxiliary (12 volt or 15 volt) outputs. 5. unless otherwise specified, rated load is 20w on the main (+5 volt) output and 10 watts each on the auxiliary (12 volt or 15 volt) outputs. load currents of up to 5a and 1a on the main and auxiliary outputs respec-tively are acceptable as long as the total output power does not to exceed 40 watts. 6. guaranteed for a d.c. to 20mhz bandwidth. tested using a 20khz to 10mhz bandwidth. 7. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in excess of the maximum limit may interfere with the proper operation of the convertersoverload protection, causing erratic behavior during turn-on. 8. overload power dissipation is defined as the device power dissipation with the load set such that v out = 90% of nominal. 9. load step transition time 10 s. 10. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of its steady state value. 11. line step transition time 100 s. 12. turn-on delay time from either a step application of input power or a logic low to a logic high transition on the inhibit pin (pin 3) to the point where v out = 90% of nominal. 13. load is varied for output under test while the remaining outputs are loaded at 50% of rated. regulation relati ve to output voltage at 50% rated load. 14. although operation at temperatures between +85c and +125c is guaranteed, no parametric limits are specified. notes: electrical performance characteristics limits parameter group a subgroup conditions -55 c t c +85 c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit line rejection i out = 100% rated load dc to 50khz, notes 1,5 40 60 db isolation 1 input to output or any pin to case except pin 10, test @500vdc 100 m ? device weight 110 g mtbf mil-hdbk-217f2, sf, 35 c 5 x 10 6 hrs downloaded from: http:///
6 www.irf.com m3g-series(28v input, triple output) radiation performance characteristics figure 1. block diagram - triple output 13 2 12 11 vin inhibit return +aux.output aux.return 4 sync.input 10 caseground 5 sync.output + - leveltranslator & fet drive biassupply under voltagelockout & inhibit emifilter short circuit & overload +10.5v +5v + - oscillator rampgenerator sample & hold feedbacktrigger pwm ea +5v +5v 13 -aux.output 6 +main mainreturn 7 international rectifier currently does not have a dla land and maritime certified radiation hardnessassurance program. test inspection method min typ unit mil-prf-883, method 1019 total ionizing dose (gamma) operating bias applied during exposure, full rated load, v in = 28v 200 300 krads(si) dose rate (gamma dot) mil-std-883, method 1023 temporary saturation operating bias applied during exposure, 1e8 rads(si)/sec survival full rated load, v in = 28v 4e10 1e11 neutron fluence mil-std-883, method 1017 8e12 1e13 neutrons/cm 2 heavy ions (let) single event effects operating bias applied during exposure, seu, sel, segr, seb full rated load, v in = 28v 82 mev cm 2 /mg test lab: brookhaven national laboratory, tandem van de graaff generator downloaded from: http:///
www.irf.com 7 m3g-series(28v input, tripleoutput) 10 10.5 11 11.5 12 12.5 13 13.5 14 12v magnitudes ( volts ) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 12v load current ( amps each ) 5v load = 4a 5v load = 2a 5v load = 0.4a
12v load regulation vs 5v load
15v load regulation vs 5v load downloaded from: http:///
8 www.irf.com m3g-series(28v input, triple output) figure 4. m3g280512t efficiency vs line and load 40 50 60 70 80 90 efficiency ( % ) 0 5 10 15 20 25 30 35 40 output power ( watts ) vin=18v vin=28v vin=50v 40 50 60 70 80 90 efficiency ( % ) 0 5 10 15 20 25 30 35 40 output power ( watts ) vin=18v vin=28v vin=50v figure 5. m3g280515t efficiency vs line and load downloaded from: http:///
www.irf.com 9 m3g-series(28v input, tripleoutput) figure 6. conducted emissions, positive lead 0 10 20 30 40 50 60 70 80 90 100 db-ua 1e3 1e4 1e5 1e6 1e7 1e8 frequency ( hz ) ceo3 limit figure 7. conducted emissions, return lead 0 10 20 30 40 50 60 70 80 90 100 db-ua 1e3 1e4 1e5 1e6 1e7 1e8 frequency ( hz ) ceo3 limit downloaded from: http:///
10 www.irf.com m3g-series(28v input, triple output) figure 8. conducted emissions, common mode 0 10 20 30 40 50 60 70 80 90 100 db-ua 1e3 1e4 1e5 1e6 1e7 1e8 frequency ( hz ) ceo3 limit downloaded from: http:///
www.irf.com 11 m3g-series(28v input, tripleoutput) ensure that flatness of the plate where m3g converter to be mounted is no greater than 0.003 per linear inch.it is recommended that a thermally conductive gasket is used to promote the thermal transfer and to fill any voids existing between the two surfaces. ir recommends sil-pad 2000 with the thickness of 0.010". theshape of the gasket should match the footprint of the converter including the mounting flanges. the gasket is available from ir. the m3g-series converter requires either m3 or 4-40 size screws for attachment purposes. the procedure for mounting the converter is as follows: 1. check the mounting surfaces and remove foreign material, burrs if any or anything that may interfere with the attachment of the converter. 2. place the gasket on the surface reserved for the converter and line it up with the mounting holes. 3. place the converter on the gasket and line both up with mounting holes. 4. install screws using appropriate washers and tighten by hand (~ 4 inoz) in the sequence shown below. application note:a) attachment of the converter 5. tighten the screws with an appropriate torque driver. torque the screws up to 6 inlb in the sequence shown above. the following procedure is recommended for mounting the converter for optimum cooling and to circumventany potential damage to the converter. downloaded from: http:///
12 www.irf.com m3g-series(28v input, triple output) standard microcircuit drawing equivalence table mechanical diagram pin designation (triple output) pin # designation pin # designation 1 + input 8 nc 2 input return 9 nc 3 inhibit 10 case ground 4 sync. input 11 - aux. output 5 sync. output 12 aux. output return 6 main return 13 +aux. output 7 + main output 3.055 max. 0.500 2.00 0.45 1.10 2.500 2.30 0.200 typ. non- cum. 0.30 1.400 ref. 3.50 ref. 0.475 max. 0.080 max. 0.260 pin ?0.040 r0.0625 4 places 0.50 0.60 0.20 tolerance : .xx 0.01 .xxx 0.005 12 3 4 5 12 1311 10 98 7 6 0.25 2.055 max. flange detail 0.40 0.25 0.14 r 0 . 0 6 2 5 standard microcircuit ir standard drawing number part number 5962-03226 m3g280512t 5962-03227 m3g280515t downloaded from: http:///
www.irf.com 13 m3g-series(28v input, tripleoutput) part numbering device screening requirement mil-std-883 method no suffix ck em temperature range -55c to +85c -55c to +85c -55c to +85c element evaluation mil-prf-38534 class k class k n/a non-destructive bond pull 2023 yes yes n/a internal visual 2017 yes yes temperature cycle 1010 cond c cond c cond c constant acceleration 2001, y1 axis 3000 gs 3000 gs 3000 gs pind 2020 cond a cond a n/a 320 hrs @ 125c 320 hrs @ 125c 48 hrs @ 125c ( 2 x 160 hrs ) ( 2 x 160 hrs ) final electrical mil-prf-38534 -55c, +25c, -55c, +25c, -55 c, +25c, ( group a ) & specification +85c +85c +85c pda mil-prf-38534 2% 2% n/a seal, fine and gross 1014 cond a, c cond a, c cond a radiographic 2012 yes yes n/a external visual 2009 yes yes burn-in 1015 world headquarters: 101 n. sepulveda blvd, el segundo, california 90245, tel: (310) 252-7105 ir san jose: 2520 junction avenue, san jose, california 95134, tel: (408) 434-5000 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 07/2014 main output voltage model nominal input voltage 28 = 28v screening level (please refer to screening table) no suffix, ck, em 03r3 = 3.3v 05 = 5v 12 = 12v 15 = 15v output t = triple m3g 28 05 15 t /xx x auxiliary output voltage 05 = 5v, 12 = 12v 15 = 15v lead finish for ck only c = gold plated a = solder dipped blank for no suffix and em lead finish for no suffix = gold plated lead finish for em is gold plated or solder dipped dependi ng on availability notes: best commercial practice. ck is a dla land and maritime ( formerl y dscc ) p art markin g used to desi g nate a class k com p liant h y brid. the ck marking does not indicate the hybrid is radiation certified. no suffix is a radiation rated device but not available as a dla land an d maritime qualified smd per mil-prf-38534. international rectifier currently does not have a dla land and maritime certified rad iation hardness assurance program . downloaded from: http:///

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