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www.irf.com 1 hybrid - high reliabilityradiation hardened dc-dc converter m3g-series description total dose > 200 krad(si), typically usable to > 300 krad(si) see hardened to let 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 single and dual output models include 3.3, 5, 5.2, 12, 15, 5, 7, 12 and 15v high efficiency - to 82% -55c to +125c operating temperature range 100m ? @ 500vdc isolation under-voltage lockout short circuit and overload protection remote sense on single output models adjustable output voltage for duals synchronization input and output output over voltage limiter external inhibit > 5,000,000 hour mtbf standard microcircuit drawings available features 28v input, single/dual output applications geostationary earth orbit satellites (geo) non-flight versions of the m3g-series converters areavailable for system development purposes. variations in electrical specifications and screening to meet custom requirements 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 system m3g 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-94534q downloaded from: http:///
2 www.irf.com m3g-series(28v input, single/dual 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. output current 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. 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 converteroperation. the nominal threshold relative to the input return (pin 2) is 1.4v. if 2.0 volts or greater areapplied 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 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). 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. remote sense is provided on the single outputmodels to compensate for voltage drops in the interconnects between the converter and the load. the output voltage of dual output models can be adjusted by a single external resistor. 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, single/dual output) 1 meets derating per mil-std-975 2 for operation at +125c see table note 13 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 in p ut volta g e ran g e 1 +18vdc to +50vdc lead temperature +300c for 10 seconds output power 0 to max. rated operating temperature -55c to +135c o p eratin g tem p erature 2 -55c to +125c storage temperature -55c to +135c o p eratin g tem p erature 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 18 28 50 v output voltage ( vout ) m3g2803r3s m3g2805s m3g2805r2s m3g2812s m3g2815s m3g2805d m3g2807d m3g2812d m3g2815d m3g2803r3s m3g2805s m3g2805r2s m3g2812s m3g2815s m3g2805d m3g2807d m3g2812d m3g2815d 1 1 1 1 1 1 1 1 1 2,3 2,3 2,3 2,3 2,3 2.3 2,3 2,3 2,3 i out = 100% rated load note 4 i out = 100% rated load note 4 3.28 4.98 5.17 11.95 14.94 4.98 6.97 11.95 14.94 3.24 4.93 5.13 11.84 14.80 4.93 6.90 11.84 14.80 3.30 5.00 5.20 12.00 15.00 5.00 7.00 12.00 15.00 3.32 5.02 5.23 12.05 15.06 5.02 7.03 12.05 15.06 3.36 5.07 5.27 12.16 15.20 5.07 7.10 12.16 15.20 v output power ( p out ) m3g2803r3s all others 1,2,3 v in = 18, 28, 50 volts, note 2 0 0 30 40 w output current ( i out ) m3g2803r3s m3g2805s m3g2805r2s m3g2812s m3g2815s m3g2805d m3g2807d m3g2812d m3g2815d 1,2,3 v in = 18, 28, 50 volts, note 2 either output, note 3 either output, note 3 either output, note 3 either output, note 3 0 0 0 0 0 0 0 0 0 9.10 8.00 7.70 3.34 2.67 6.40 4.57 2.67 2.14 a line regulation ( vr line ) 1,2,3 v in = 18, 28, 50 volts i out = 0, 50%, 100% rated, note 4 -10 10 mv load regulation ( vr load ) 1,2,3 i out = 0, 50%, 100% rated, note 4 v in = 18, 28, 50 volts -0.5 0.5 % cross regulation ( vr cross ) m3g2805d m3g2807d m3g2812d m3g2815d 1,2,3 duals only, note 5 v in = 18, 28, 50 volts -5.0 -5.0 -3.0 -3.0 5.0 5.0 3.0 3.0 % downloaded from: http:///
4 www.irf.com m3g-series(28v input, single/dual 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 input current ( i in ) 1,2,3 i out = 0, pin 3 open 40 80 ma pin 3 shorted to pin 2 2.0 5.0 switching frequency ( f s ) 1,2,3 sync. input (pin 4) open 450 500 550 khz output ripple ( v rip ) m3g2803r3s m3g2805s m3g2805r2s m3g2812s m3g2815s m3g2805d m3g2807d m3g2812d m3g2815d 1,2,3 i out = 100% rated load notes 4, 6 15 20 25 25 25 20 25 30 30 35 50 50 60 80 50 55 60 60 mv p-p efficiency ( e ff ) m3g2803r3s m3g2805s m3g2805r2s m3g2812s m3g2815s m3g2805d m3g2807d m3g2812d m3g2815d 1 i out = 100% rated load note 4 68 75 75 75 77 75 75 76 77 72 77 77 78 80 78 78 79 80 % 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 load current 1,2,3 v out = 90% of nominal, note 4 125 135 % power dissipation, load fault (p d ) 1,2,3 short circuit, overload, note 8 14 20 w output response to step load changes (v tld ) 4,5,6 half load to/from full load, notes 4, 9 -300 300 mv pk recovery time, step load changes (t tld ) 4,5,6 half load to/from full load, notes 4, 9,10 50 200 s output response to step line changes (v tln ) 18v to/from 50v i out = 100% rated load, notes 1,4,11 -300 300 mv pk recovery time, step line changes (t tln ) 18v to/from 50v i out = 100% rated load, notes 1,4,10,11 50 200 s turn-on response overshoot (v os ) turn-on delay (t dly ) 4,5,6 no load, full load notes 4,12 1.0 10 5.0 % ms downloaded from: http:///
www.irf.com 5 m3g-series(28v input, single/dual output) electrical performance characteristics ( continued ) notes: electrical performance characteristics 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. limit represents 80% of total rated output current. to achieve rated output power, the remaining 20% of the total rated output current must be provided by the other output. 4. load current split equally between outputs on dual output models. 5. cross regulation is measured with 20% rated load on output under test while changing the load on the other output from 20% to 80% of rated. 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 converters overload 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. although operation at temperatures between +85c and +125c is guaranteed, no parametric limits are specified. 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 capacitive load (cl) m3g2803r3s m3g2805s m3g2805r2s m3g2812s m3g2815s m3g2805d m3g2807d m3g2812d m3g2815d i out = 100% rated load no effect on dc performance notes 1, 4, 7 each output on duals 2200 1000 1000 180 120 500 300 90 60 f line rejection i out = 100% rated load dc to 50khz, notes 1, 4 40 60 db isolation 1 input to output or any pin to case except pin 6, test @ 500vdc 100 m ? device weight 110 g mtbf mil-hdbk-217f2, sf, 35 c 5.0 x 10 6 hrs downloaded from: http:///
6 www.irf.com m3g-series(28v input, single/dual output) fig 1. block diagram - single output fig 2. block diagram - dual output 13 2 1312 vin inhibit return +output return 4 sync.input 9 +sense 10 -sense 6 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 rs +5v +5v 13 2 12 11 vin inhibit return +output return 4 sync.input 8 adjust 6 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 -output downloaded from: http:///
www.irf.com 7 m3g-series(28v input, single/dual output) fig 3. conducted emissions, positive lead fig 4. line rejection, 28vdc + 8vacp-p 0 10 20 30 40 50 60 70 80 90 100 db-ua 1e3 1e4 1e5 1e6 1e7 1e8 frequency ( hz ) ceo3 limit -120 -100 -80 -60 -40 -20 0 db 1e2 1e3 1e4 1e5 frequency ( hz ) downloaded from: http:///
8 www.irf.com m3g-series(28v input, single/dual output) fig 5. m3g2803r3s efficiency 40 50 60 70 80 efficiency ( % ) 0 5 10 15 20 25 30 35 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 fig 6. m3g2805s efficiency downloaded from: http:///
www.irf.com 9 m3g-series(28v input, single/dual output) fig 7. m3g2812s efficiency 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 radiation performance characteristics 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:///
10 www.irf.com m3g-series(28v input, single/dual output) 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 notes: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:///
www.irf.com 11 m3g-series(28v input, single/dual output) b) output voltage adjustment. adjustment of the output voltage requires the +sense pin be connected in one of two ways as shown infigures 8 and 9 below. use the equations and circuit configurations provided to calculate the required resistance ( r adj ) for the applicable voltage adjust range. the output adjustment is limited to 0 to +10% range for reliable operation. fig 8. configuration for adjusting single output voltage from +0.25v to +10% fig 9. configuration for adjusting single output voltage from 0 to +0.25v single output: m3g (single output) 13 10 12 9 +out -sense out return +sense radj m3g (single output) 13 10 12 9 +out -sense out return +sense radj downloaded from: http:///
12 www.irf.com m3g-series(28v input, single/dual output) for m3gxx03r3s: using the configuration of fig 8 and where r adj is in ohms and 3.513 v out 3.630 using the configuration of fig 9 and where r adj is in ohms and 3.300 v out 3.513 for m3gxx05s: using the configuration of fig 8 and where r adj is in ohms and 5.250 v out 5.500 using the configuration of fig 9 and where r adj is in ohms and 5.500 v out 5.250 for m3gxx15s: using the configuration of fig 8 and where r adj is in ohms and 15.315 v out 16.500 using the configuration of fig 9 and where r adj is in ohms and 15.000 v out 15.315 for m3gxx12s: using the configuration of fig 8 and where r adj is in ohms and 12.312 v out 13.200 using the configuration of fig 9 and where r adj is in ohms and 12.000 v out 12.312 513 .3 495 ? = out adj v r () () out out adj v v r ? ? = 513 .3 300 .3 150 25 .5 750 ? = out adj v r ()() out out adj v v r ? ? = 250 .5 000 .5 150 312 . 12 1800 ? = out adj v r ()() out out adj v v r ? ? = 312 . 12 000 . 12 150 315 . 15 2250 ? = out adj v r () () out out adj v v r ? ? = 315 . 15 000 . 15 150 downloaded from: http:///
www.irf.com 13 m3g-series(28v input, single/dual output) fig 10. configuration for adjusting dual output voltage for all dual output models, to adjust the output voltage higher: where: r adj is in kohms r adj is connected to -out pin and v nom v out 1.1v nom (fig. 10, note 2) v nom is the nominal output voltage with the adjust pin left open v out is the desired output voltage for all dual output models, to adjust the output voltage lower: where: r adj is in kohms r adj is connected to +out pin and 0.75v nom v out v nom (fig. 10, note 1) v nom is the nominal output voltage with the adjust pin left open v out is the desired output voltage the dual output models have an adjust pin which can be connected through a resistor ( r adj ) to either output. this allows the outputs to be reliably adjusted by approximately +10% to -25% of the nominal output voltage.refer to figure 10 and use equations provided to calculate the required resistance ( r adj ). dual output: m3g (dual output) 13 11 12 8 +out adjust out return -out radj note 2 note 1 notes: 1. for vout < vnom 2. for vout > vnom () 51 1 64 .1 48 .3 ? ? ? = nom out nom adj v v v r () () 51 1 64 .11 64 .1 48 .3 ? ? ? ? = out nom out nom adj v v v v r downloaded from: http:///
14 www.irf.com m3g-series(28v input, single/dual output) mechanical diagram pin designation (single/dual) pin # designation pin # designation 1 + input 8 nc / adjust 2 input return 9 - sense / nc 3 inhibit 10 + sense / nc 4 sync. input 11 nc / - output 5 sync. output 12 output return 6 case ground 13 + output 7n c standard microcircuit drawing equivalence table 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 5962-03218 m3g2803r3s 5962-03219 m3g2805s 5962-03220 m3g2805r2s 5962-03221 m3g2812s 5962-03222 m3g2815s 5962-03223 m3g2805d 5962-10216 m3g2815d downloaded from: http:///
www.irf.com 15 m3g-series(28v input, single/dual output) 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: 233 kansas st., 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. 09/2012 output voltage model nominal input voltage 28 = 28v screening level (please refer to screening table) no suffix, ck, em 03r3 = 3.3v, 05 = 5v 05r2 = 5.2v, 12 = 12v 15 = 15v output s = single d = dual m3g 28 05 s /xx x 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 depending on availability notes: best commercial p ractice. 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 certif ied. no suffix is a radiation rated device but not available as a dla land and maritime qualified smd per mil-prf-38534. international rectifier currentl y does not have a dla land and maritime certified radiation hardness assuranc e pro g ram . downloaded from: http:///

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