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www.irf.com 1 m3gb-series description total dose > 200 krads(si), typically usable to > 300 krads(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 main: +5v auxilliary: 12v or 15v main output isolated from auxilliary outputs high efficiency - to 82% -55c to +125c operating temperature range 100m ? @ 100vdc isolation under-voltage lockout synchronization input and output short circuit and overload protection adjustable output voltage external inhibit > 6,000,000 hour mtbf features 28v input, triple output applications non-flight versions of the m3gb-series converters are available for system development purposes. variations in electrical specifications and screening to meet custom requirements can be accommodated. 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. m3gb hybrid-high reliability radiation 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. the m3gb-series of dc-dc converters are second generation design of the legacy m3g-series product family but with enhanced overall performance. m3gb- series is form, fit and functional equivalent to the first generation m3g-series. it is designed to be backward compatible to the m3g-series. much the same as the original m3g-series, these 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. geostationary earth orbit satellites (geo) deep space satellites / probes strategic weapons and commun ication system pd-97824
2 www.irf.com m3gb-series (28v input, triple output) circuit description an internal emi filter allows the converter to meet the conducted 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 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 16.5 volts and will shut down when the input voltage drops below 15.3 volts. the 1.2v 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 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. the main (+5 volt ) output is regulated by the control loop 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 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 m3gb-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 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 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). the m3gb-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 30% over the nominal regardless of the line voltage.
www.irf.com 3 m3gb-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 limits parameter group a subgroup conditions -55c t c + 85c 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) m3gb280512t (aux.) m3gb280515t ( aux.) (main) m3gb280512t (aux.) m3gb280515t ( aux.) 1 2,3 i out = 100% rated load, note 5 4.98 11.50 14.60 4.95 11.30 14.50 5.00 11.80 14.80 5.02 12.10 15.00 5.05 12.30 15.10 v output power (p out ) 1,2,3 v in = 18, 28, 50 volts, note 2 0 40 w output current (i out ) (main) m3gb280512t (aux.) m3gb280515t ( 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) m3gb280512t (aux) m3gb280515t ( aux.) 1,2,3 v in = 18, 28, 50 volts i out = 10, 50%, 100% rated note 5 -10 -120 -200 10 120 200 mv load regulation (vr load ) (main) m3gb280512t ( aux.) m3gb280515t ( aux.) 1,2,3 i out = 10%, 50%,100% r ated v in = 18, 28, 50 volts, notes 5, 13 -25 -400 -350 25 400 350 mv cross regulation (vr cross ) (main) m3gb280512t ( aux.) m3gb280515t (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 60 80 input current (i in ) 1,2,3 pin 3 shorted to pin 2 5.0 ma input voltage range -0.5v dc to +80v dc input voltage range +18v dc to +60v dc output power internally limited input voltage range 1 +18v dc to +50v dc 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
4 www.irf.com m3gb-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 +8 5 c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit output ripple (v rip ) (main) m3gb280512t (aux.) m3gb280515t (aux.) 1,2,3 v in = 18, 28, 50 volts i out =100% rated load, notes 5, 6 25 30 30 50 60 75 mvp-p switching frequency (f s ) 1,2,3 sych. input (pin4) open 475 500 525 khz efficiency (e ff ) 1,2,3 i out = 100% rated load note 5 78 82 % 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 5 105 150 % power dissipation, load fault (p d ) 1,2,3 short circuit, overload, note 8 18 w output response to step load changes (v tld ) 4,5,6 half load to/from full load, notes 5,9 -300 300 mvpk 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 ) 22v to/from 34v i out = 100% rated load, notes 1, 5,1 1 -200 200 mvpk recovery time, step line changes (t tln ) 22v to/from 34v 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 10% load, full load, notes 5,12 1.0 100 100 5.0 mv 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
www.irf.com 5 m3gb-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 atleast 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 atleast 50 ma or 20 percent of the total output power, whichever is greater, be taken from the auxillary (12 volt 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 respectivelyare 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 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. load is varied for output under test while the remaining outputs are loaded at 50% of rated. regulation relative 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 -55c t c +85c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit line rejection main 40 50 auxiliary i out = 100% rated load dc to 50khz, notes 1,5 30 40 db isolation 1 input to output or any pin to case except pin 10, test @100vdc 100 m ? device weight 110 g mtbf mil-hdbk-217f2, sf, 35c 6 x 10 6 hrs
6 www.irf.com m3gb-series (28v input, triple output) radiation performance characteristics fig. 1. block diagram + - test conditions 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 krrads(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 (supported by analysis) neutron fluence mil-std-883, method 1017 8e12 1e13 neutrons/cm 2 (supported by analysis) 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
www.irf.com 7 m3gb-series (28v input, tripleoutput) cross regulation @ 25c, m3g280515t fig. 3. typical efficiency @ 25c, m3g280515t 40 50 60 70 80 90 0 102030405060708090100 p ercentage of l oad, % e f ficiency, % 18v input 28v input 50v input 13 14 15 16 17 18 0 30 50 75 100 150 300 450 600 750 au xiliar y ou tpu t voltage l oad cu r r en t , ma auxiliary output voltage, volts main @ 0.4a main @ 2a main @ 4a
8 www.irf.com m3gb-series (28v input, triple output) ensure that flatness of the plate where m3gb 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". the shape of the gasket should match the footprint of the converter including the mounting flanges. the gasket is available from ir. the m3gb-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 circumvent any potential damage to the converter.
www.irf.com 9 m3gb-series (28v input, tripleoutput) b) output voltage adjustment. to adjust the output voltage,a resistor (r adj ) is connected between the adjust pin (pin 8) and either the, main return or main out pins dependign on whether the output voltage is to be adjusted higher or lower than the nominal set-point. this allows the outputs to be reliably adjusted by approximately +10% to -20% of the nominal output voltage. refer to fig. 4 and use equations provided to calculate the required resistance (r adj ). please note that the auxiliary output voltages will track the voltage of the main output, higher or lower than the set points by the same percentage of adjustment. fig 4. configuration for adjusting triple output voltage for all triple output models, to adjust the output voltages higher: r adj = 10 x (v nom -2.5) -50 v out -v nom where: r adj is in kohms r adj is connected to the -out pin and v nom < v out < 1.1v nom (fig. 4, note 2) v nom is the nominal output voltage with the adjust pin left open v out is the desired output voltage for all triple output models, to adjust the output voltages lower: r adj = 4 x (v nom -2.5) x ( v out -2.5) -50 v out -v nom where: r adj is in kohms r adj is connected to the +out pin and 0.8v nom < v out < v nom (fig. 4, note 1) v nom is the nominal output voltage with the adjust pin left open v out is the desired output voltage
10 www.irf.com m3gb-series (28v input, triple output) mechanical diagram pin designation 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 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 pin # designation pin # designation 1 + input 8 adjust 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
www.irf.com 11 m3gb-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, -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 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. 05/2015 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 and maritime qualified smd per mil-prf-38534. international rectifier currently does not have a dla land and maritime certified radiation hardness assurance program . 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 m3gb 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 depending on availability

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