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11/24/03 www.irf.com 1 advanced analog high reliability radiation hardened dc/dc converter g-series description total dose > 200k rad(si), typically usable to > 300k rad(si) see 82 mev . cm 2 /mg internal emi filter; converter capable of meeting mil-std-461c ce03 and cs01 low weight, < 90 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 features 28v input, triple output full environmental screening includes temperature cycling, constant acceleration, fine and gross leak, particle impact noise detection (pind), radiographic and 320 hours burn-in. applications geostationary earth orbit satellites (geo) non-flight versions of the g-series converters are available for system development purposes. variations the g-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. all components are fully derated to meet the requirements of mil-std-975, mil-std- 1547 and gsfc ppl-21 appendix b. extensive documentation including radiation susceptibility, thermal, stress, worst case, failure modes and effects analyses and mtbf are available for customer review and included with each order. 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 0.4" package constructed of an aluminum/silicon-carbide (al/sic) base and an alloy 48 ring frame and they weigh less than 90 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 in electrical specifications and screening to meet custom requirements can be accommodated. pd - 94535d
2 www.irf.com g-series the g-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 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 15.5 volts. the one volt 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 g-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. 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. 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 current limit point exhibits a slightly negative temperature coefficient to reduce the possibility of thermal runaway.
www.irf.com 3 g-series 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 1 meets derating per mil-std-975 2 for operation at +125c see table note 14 absolute maximum ratings recommended operating conditions electrical performance characteristics for notes to specifications, refer to page 5

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www.irf.com 5 g-series electrical performance characteristics ( continued ) limits parameter group a subgroup conditions -55 c t c +125 c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit line rejection 1 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 90 grams mtbf mil-hdbk-217f2, sf, 35 c 5 x 10 6 hours 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 respectively 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 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 sec. 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 sec. 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. for operation at temperatures between +85 c and +125 c, derate the maximum input voltage linearly from 60v to 40v and the maximum output power linearly from 100% to 75%. table i. electr ical p erf or mance char acter istics - notes
6 www.irf.com g-series radiation performance characteristics device screening

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www.irf.com 7 g-series block diagram - triple output 1 3 2 12 11 vin inhibit return +aux. output aux. return 4 sync. input 10 case ground 5 sync. output + - level translator & fet drive bias supply under voltage lockout & inhibit emi filter short circuit & overload +10.5v +5v + - oscillator ramp generator sample & hold feedback trigger pwm ea +5v +5v 13 -aux. output 6 +main main return 7
8 www.irf.com g-series 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 13 13.5 14 14.5 15 15.5 16 16.5 17 17.5 18 15v magnitudes ( volts ) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 15v load current ( amps each ) 5v load = 4a 5v load = 2a 5v load = 0.4a 15v load regulation vs 5v load
www.irf.com 9 g-series 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 M3G280515T efficiency vs line and load
10 www.irf.com g-series 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 conducted emissions, return lead 0 10 20 30 40 50 60 70 80 90 100 db-ua 1e3 1e4 1e5 1e6 1e7 1e8 frequenc y ( hz ) ceo3 limit
www.irf.com 11 g-series 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
12 www.irf.com g-series 3.00 0.500 2.000 0.450 1.100 2.500 2.300 0.200 typ. non-cum. 0.300 1.400 ref. 3.50 ref. 0.445 max 0.080 max. 0.260 pin ?0.040 r0.0625 4 places 0.500 0.600 0.200 tolerance : .xx 0.01 .xxx 0.005 1 2 3 4 5 12 13 11 10 9 8 7 6 0.25 3.00 2.000 mechanical diagram pin designation (triple output) part number m3g 28 0515 t model input volta g e 28 = 28v nominal output volta g e 0512 = 5v,12v 0515 = 5v,15v outputs t = triple pin signal pin signal pin 1 +v pin 8 n/c pin 2 input return pin 9 n/c pin 3 inhibit pin 10 case ground pin 4 sync. input pin 11 -aux. output pin 5 sync. output pin 12 aux. output return pin 6 main return pin 13 +aux. output pin 7 +main output world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 252-7105 ir santa clara: 2270 martin av., santa clara, california 95050, tel: (408) 727-0500 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 11/03

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