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www.irf.com 1 hybrid high-reliability radiation hardened dc-dc converter m3g-series description total dose > 200krad(si), typically usable to > 300krad(si) see hardened to let up to 82 mev . cm 2 /mg low weight, < 110 grams low input & output noise magnetically coupled feedback 95v to 140v dc input range up to 40w output power single and dual output models include 3.3, 5, 12, 15, 28 and 5, 12 and 15v high efficiency - to 82% -55c to +125c operating temperature range 100m ? @ 500v dc isolation under-voltage lockout short circuit and overload protection output over voltage limiter remote sense on single output models adjustable output voltage synchronization input and output external inhibit > 5,000,000 hour mtbf features 120v input, single/dual 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 custom requirements can be accommodated. the m3g-series of dc-dc converters are radiation hardened, 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. deep space satellites / probes strategic weapons and communication systems 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. by using two stage filtering these converters produce low input and output noise. 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. m3g manufactured in a facility fully qualified to mil-prf- 38534, these converters are fabricated utlizing dla qualified processes. for available screening options, refer to device screening table in the data sheet. pd-97820
2 www.irf.com m3g-series (120v input, single/dual output) preliminary the m3g-series converters utilize a single-ended forward 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. circuit description output current is limited under any load fault condition to 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 the converter 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 88 volts and will shut down when the input voltage drops below 84 volts. the four volts of hysteresis reduces the possibility of line noise interfering with the converter?s 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 the m3g-series was developed using a proven conservative 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 cdr type ceramic capacitors, a capacitor with 50v rating is used for in-circuit voltage stress if less than 10v. careful sizing of decoupling capacitors and current limiting resistors minimizes the possibility of photo- 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 multiple converters 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 output models 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. an internal emi filter reduces the conducted emissions to less than 5ma rms on the input power leads. a two-stage output filter reduces the typical output ripple to less than 20mv peak-to-peak.
www.irf.com 3 m3g-series (120v input, single/dual output) preliminary 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 +160vdc in p ut volta g e ran g e 1 +95vdc to +140vdc output power internally limited output power 0 to max. rated lead temperature +300c for 10 seconds o p eratin g tem p erature 2 -55c to +125c operating temperature -55c to +135c o p eratin g tem p erature 1 -55c to +70c storage temperature -55c to +135c recommended operating conditions absolute maximum ratings limits parameter group a subgroup conditions -55 c t c +85 c v in = 120v dc 5%, c l = 0 unless otherwise specified min nom max unit input voltage 95 120 140 v output voltage (vout) m3g12003r3s M3G12005S m3g12012s m3g12015s m3g12028s m3g12005d m3g12012d m3g12015d m3g12003r3s M3G12005S m3g12012s m3g12015s m3g12028s m3g12005d m3g12012d m3g12015d 1 1 1 1 1 1 1 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 11.95 14.94 27.88 4.98 11.95 14.94 3.24 4.93 11.84 14.80 27.60 4.93 11.84 14.80 3.30 5.00 12.00 15.00 28.00 5.00 12.00 15.00 3.32 5.02 12.05 15.06 28.12 5.02 12.05 15.06 3.36 5.07 12.16 15.20 28.40 5.07 12.16 15.20 v output power ( p out ) m3g12003r3s all others 1,2,3 v in = 95, 120, 140 volts, note 2 0 0 30 40 w output current ( i out ) m3g12003r3s M3G12005S m3g12012s m3g12015s m3g12028s m3g12005d m3g12012d m3g12015d 1,2,3 v in = 95, 120, 140 volts, note 2 either output, note 3 either output, note 3 either output, note 3 0 0 0 0 0 0 0 0 9.1 8.0 3.34 2.67 1.43 6.40 2.67 2.14 a line regulation ( vr line ) 1,2,3 v in = 95, 120, 140 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 = 95, 120, 140 volts -0.5 0.5 % cross regulation ( vr cross ) m3g12005d m3g12012d m3g12015d 1,2,3 duals only, note 5 v in = 95, 120, 140 volts -5.0 -3.0 -3.0 5.0 3.0 3.0 %
4 www.irf.com m3g-series (120v input, single/dual output) preliminary 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 = 120v dc 5%, c l = 0 unless otherwise specified min nom max unit i out = 0, pin 3 open 50 input current (i in ) 1,2,3 pin 3 shorted to pin 2 2.0 5.0 ma output ripple ( v rip ) m3g12003r3s M3G12005S m3g12012s m3g12015s m3g12028s m3g12005d m3g12012d m3g12015d 1,2,3 v in = 95, 120, 140 volts i out = 100% rated load notes 4, 6 15 20 25 25 40 20 30 30 35 50 60 80 140 50 60 60 mvp-p switching frequency ( f s ) 1,2,3 sync. input (pin 4) open 450 500 550 khz efficiency ( e ff ) m3g12003r3s M3G12005S m3g12012s m3g12015s m3g12028s m3g12005d m3g12012d m3g12015d 1,2,3 i out = 100% rated load note 4 70 77 78 79 79 77 78 79 75 81 82 83 83 81 82 83 % 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 4 145 % 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 4,9 m3g12028s all other models -500 -300 500 300 mvpk recovery time, step load changes (t tld ) 4, 5, 6 half load to/from full load, notes 4, 9,10 50 200 s recovery time, step line changes (t tln ) 95v to/from 140v i out = 100% rated load, notes 1,4,10,11 50 200 s output response to step line changes (v tln ) 95v to/from 140v i out = 100% rated load, notes 1, 4,11 -300 300 mvpk 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
www.irf.com 5 m3g-series (120v input, single/dual output) preliminary 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. output load current must be distributed such that at least 20% of the total load current is being provided by one of the outputs. 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 converter?s 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 = 120v dc 5%, c l = 0 unless otherwise specified min nom max unit capacitive load (c l ) m3g12003r3s M3G12005S m3g12012s m3g12015s m3g12028s m3g12005d m3g12012d m3g12015d i out = 100% rated load no effect on dc performance notes 1, 4, 7 each output on duals 2200 1000 180 120 60 500 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, 35c 6.0 x 10 6 hrs
6 www.irf.com m3g-series (120v input, single/dual output) preliminary figure 1. block diagram - single output figure 2. block diagram - dual output + -

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www.irf.com 7 m3g-series (120v input, single/dual output) preliminary radiation performance characteristics test conditions min typ unit total ionizing dose ( gamma ) mil-std-883, method 1019 operating bias applied during exposure 100 300 krads(si) dose rate ( gamma dot ) temporary saturation survival mil-std-883, method 1023 1e8 4e10 1e11 rads (si)/sec neutron fluence mil-std-883, method 1017 8e12 1e13 neutrons /cm 2 single event effects seu, sel, segr, seb heavy ions (let) 82 mev ? cm 2 /mg international rectifier currently does not have a dla certified radiation hardness assurance program.
8 www.irf.com m3g-series (120v input, single/dual output) preliminary mechanical diagram pin designation (single/dual) pin # designation pin # designation 1 + input 8 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 7nc 3.055 max . 0.500 2.00 0.45 1.10 2.500 2.30 0.200 typ. non - cum . 0.30 1.40 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 1 2 3 4 5 12 13 11 10 9 8 7 6 0.25 2.055 max. flange detail 0.40 0.25 0.14 r 0 . 0 6 2 5
www.irf.com 9 m3g-series (120v input, single/dual output) preliminary 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, -55c, +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 notes: best commercial practice. ck is dla class k com p liant without radiation p erformance. no suffix is a radiation rated device but not available as a dla qualified smd per mil-prf-38534. international rectifier currently does not have a dla certified radiation hardness assurance program. world headquarters: 101 n, sepulveda blvd., el segundo, california 90245, usa tel: (310) 252-7105 ir san jose: 2520 junction avenue, san jose, california 95134, usa tel: (408) 434-5000 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 04/2014 output voltage model nominal input voltage screening level (please refer to screening table) no suffix, ck, em 03r3 = 3.3v, 05 = 5v 12 = 12v, 15 = 15v 28 = 28v output s = single d = dual 120 = 120v m3g 120 05 s /xx x 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 lead finish for ck only c = gold plated a = solder dipped

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