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| 08/08/03 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 single and dual output models include 3.3, 5, 12, 15, 5, 12 and 15v high efficiency - to 82% -55c to +125c operating temperature range 100m ? @ 500vdc isolation under-voltage lockout short circuit and overload protection output over voltage limiter remote sense on single output models adjustable output voltage for duals synchronization input and output external inhibit > 5,000,000 hour mtbf features 28v input, single/dual output full environmental screening includes temperature cy- cling, 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 avail- able for system development purposes. variations in the g-series of dc/dc converters are radiation hard- ened, 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 ca- pacitors that are subjected to extensive lot screening for optimum reliability. these converters are capable of meeting the conducted emissions and conducted sus- ceptibility requirements of mil-std-461c without any additional components. external inhibit and synchroni- zation 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 con- structed 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 electrical specifications and screening to meet custom requirements can be accommodated. pd - 94534d
2 www.irf.com g-series the g-series converters utilize a single-ended for- ward 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 volt- age 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. output current is limited under any load fault condi- tion to approximately 125% of rated. an overload condition causes the converter output to behave like a constant current source with the output voltage drop- ping below nominal. the converter will resume nor- mal operation when the load current is reduced be- low the current limit point. this protects the converter from both overload and short circuit conditions. the current limit point exhibits a slightly negative tem- perature coefficient to reduce the possibility of ther- mal runaway. an under-voltage lockout circuit prohibits the con- verter 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 con- verter 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 con- verter 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 con- servative design methodology which includes se- lecting 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 resis- tors 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 ra- diation susceptibility (tree ), worst case, stress, thermal, failure modes and effects (fmea) and re- liability (mtbf). synchronization input and output allow multiple converters to operate at a common switching fre- quency. 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 mod- els to compensate for voltage drops in the intercon- nects between the converter and the load. the out- put voltage of dual output models can be adjusted by a single external resistor. 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 13 absolute maximum ratings recommended operating conditions electrical performance characteristics for notes to specifications, refer to page 5 !"# $ % & ' () * *+ , % - $ . % / 0 *1 $121 *1 $ *1 $2 *1 - *1 - *1 $ *1 - *1 - *1 $121 *1 $ *1 $2 *1 - *1 - *1 $ *1 - *1 - - - - - - - - - #1 #1 #1 #1 #1 #1 #1 #1 ., -$$" % 3 ., -$$" % 3 14 345 4-6 --45 -3453 !345 !--45 !-3453 14 3 3451 4-1 --43 -34$ !3451 !--43 !-34$ 141$ 4$$ 4 $ - 4$$ -4$$ !4$$ !- 4$$ !-4$$ 141 4$ 4 1 - 4$ -4$7 !4$ !- 4$ !-4$7 1417 4$6 4 6 - 4-7 -4 $ !4$6 !- 4-7 !-4 $ . ' / ., 0 *1 $121 %%.& -# #1 -# #$ %# $ $ 1$ 3$ 8 8 . ( / ., 0 *1 $121 *1 $ *1 $2 *1 - *1 - *1 $ *1 - *1 - -# #1 -# #$ %# 9& . # 1 9& . # 1 9& . # 1 $ $ $ $ $ $ $ $ 54- 646 1413 476 743 476 4-3 % /2 9 0 -# #1 -# #$ % ., $#$"#-$$" # 3 -$ -$ % /2 . 0 -# #1 ., $#$"#-$$" # 3 -# #$ % $4 $4 " % /2 2. 0 *1 $ *1 - *1 - -# #1 % %:# -# #$ % 4$ 14$ 14$ 4$ 14$ 14$ " " " 4 www.irf.com g-series electrical performance characteristics ( continued ) for notes to specifications, refer to page 5 !"# $ % & ' () * *+ , ( / 0 -# #1 ., $#1 3$ $ 1& '(&) ; (:/< 0 -# #1 :(4 /30 3$ $$ $ =>? . % / 2 0 *1 $121 *1 $ *1 $2 *1 - *1 - *1 $ *1 - *1 - -# #1 ., -$$" % 3#7 - $ $ 1$ 1$ 1 $ $ 7$ $ $ 7$ 7$ 9))( (:/9 << 0 *1 $121 *1 $ *1 $2 *1 - *1 - *1 $ *1 - *1 - - ., -$$" % 3 7 6 6 6 66 6 67 66 6 66 66 6 $ 6 65 $ " " " " " " " " & ( ( @ % @ ( /a0 @ % -# #1 - 14$ $4 4$ -$$ $ :(& ? ) ; (: % &&% @ % % % '% @ % % % :(:(% -# #1 9+4% (a :(4 /30 - 3$ 34$ $4 3$ $ 7$$ -$4$ $4 $ =&? b " 9+ ( )) %% % ( -# #1 5$" ) %# 3 - -1 " ' #% ) %/ 0 -# #1 & ( #.@ % # -3 $ 8 . % (& / 0 3##7 >%) b) < %% # 3#5 1$$ 1$$ a 2 ( @ : # % (& / 0 3##7 >%) b) < %% # 3#5#-$ $ $$ . % (& / 0 3##7 - b) $ ., -$$" % # -#3#-- 1$$ 1$$ a 2 ( @ : # % (& / 0 3##7 - b) $ ., -$$" % # -#3#-$#-- $ $$ 2 .@ & / . 0 %:/ c 0 3##7 #< %% 3#- - -$ " www.irf.com 5 g-series electrical performance characteristics ( continued ) table i. electr ical p erf or mance char acter istics - notes 1. parameter is tested as part of design characterization or after design changes. thereafter, parameter shall be guaranteed to the limits specified. 2. parameter verified during line and load regulation tests. 3. limit represents 80% of total rated output current. to achieve rated output power, the remaining 20% of the total rated output current must be provided by the other output. 4. load current split equally between outputs on dual output models. 5. cross regulation is measured with 20% rated load on output under test while changing the load on the other output from 20% to 80% of rated. 6. guaranteed for a d.c. to 20mhz bandwidth. tested using a 20khz to 10mhz bandwidth. 7. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in excess of the maximum limit may interfere with the proper operation of the converter?s overload protection, causing erratic behavior during turn-on. 8. overload power dissipation is defined as the device power dissipation with the load set such that v out = 90% of nominal. 9. load step transition time 10 sec. 10. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of its steady state value. 11. line step transition time 100 sec. 12. turn-on delay time from either a step application of input power or a logic low to a logic high transition on the inhibit pin (pin 3) to the point where v out = 90% of nominal. 13. for operation at temperatures between +85 c and +125 c, derate the maximum input voltage linearly from 60v to 40v and the maximum output power linearly from 100% to 75%. !"# $ % & ' () * *+ , (@ /0 *1 $121 *1 $ *1 $2 *1 - *1 - *1 $ *1 - *1 - - ., -$$" % )) ( ) ( -#3#6 9(& % $$ -$$$ -$$$ -$ - $ $$ 5$ 7$ d< d< d< d< d< d< d< d< 2 e ( - ., -$$" % $=>?# -#3 3$ 7$ f % - . : +( 7# g$$ -$$ * ? @( 8 & 5$ *f< * > f= -6< #<#1 4$+-$ 7 > 6 www.irf.com g-series radiation performance characteristics device screening % ? / 0 * 1#* & -$-5 . % + # < %%2 # $$ -$$$ =2 /0 2 / 0 : @@% * 1#* & -$ 1 . % + # < %%2 # -9 39-$ -9-- 2/0b ( <% ( * 1#* & -$-6 9- -9-1 b( % 9@ 9)) ( 9,#9#9 2#9f > @: /90 . % + # < %%2 # * ( b 9% 9@% * 2<113( 2 ; (@ f %% * 1#* & $ 1 % % * 1#* & $-6 :(% * 1#* & -$-$ (( % * 1#* & $$- #c-+ %: * 1#* & $ $ 9% ( (% (( ( '& @( ()( f * 1#* & -$- 1 $> <%9% ( (%/ 0 (( ( '& @( ()( % < a a * 1#* & -$-3 - 2 &( * 1#* & $- 9+ % % * 1#* & $$5 www.irf.com 7 g-series block diagram - single output block diagram - dual output 1 3 2 13 12 vin inhibit return +output return 4 sync. input 9 +sense 10 -sense 6 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 rs +5v +5v 1 3 2 12 11 vin inhibit return +output return 4 sync. input 8 adjust 6 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 -output 8 www.irf.com g-series conducted emissions, positive lead 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 ) www.irf.com 9 g-series 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 m3g2805s efficiency 10 www.irf.com g-series 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 www.irf.com 11 g-series world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 322 3331 advanced analog: 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. 08/03 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 (single/dual) part number pin signal pin signal pin 1 +v input pin 8 nc / adjust pin 2 input return pin 9 -sense / nc pin 3 inhibit pin 10 +sense / nc pin 4 sync. input pin 11 nc / -output pin 5 sync. output pin 12 output return pin 6 case ground pin 13 +output pin 7 nc m3g 28 05 s model nominal input volta g e 28 = 28v outputs s = single d = dual nominal output volta g es 03r3 = 3.3v, 05r2 = 5.2v 05 = 5v, 12 = 12v, 15 = 15v |
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