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| 02/25/03 www.irf.com 1 advanced analog high reliability radiation tolerant dc/dc converters h-series description total dose > 25k rad(si) see > 37 mev . cm 2 /mg internal emi filter; converter capable of meeting mil-std-461c ce03 and cs01 low weight, < 125 grams magnetically coupled feedback 18v to 50v input range ( 50v, 70v, and 120v models available) up to 40w output power single and dual output models include 3.3, 5, 5.2, 12, 15, 5, 12, 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 adjustable output voltage external inhibit 1,500,000 hour mtbf features +28v input, single/dual output the h-series of dc/dc converters are radiation toler- ant, high reliability devices designed for moderate ra- diation environments such as those encountered by low earth orbit satellites and launch vehicles. for higher radiation environments, the g-series of dc/dc con- verters is recommended. system upgrades to higher radiation tolerance applications can be easily accom- modated with the g-series converters because they have the same mechanical outline and are pin compat- ible. for physically smaller, lower output power single and dual output applications the l-series of dc/dc con- verters are recommended. features of the h-series in- clude up to 40 watt output power, small size, low weight and a high tolerance to total ionizing dose, single event effects and environmental stresses such as tempera- ture extremes, mechanical shock, and vibration. all com- ponents are fully derated to meet the requirements of mil-std-975 and mil-std-1547. extensive documen- tation including radiation susceptibility, thermal analy- sis, stress analysis and mtbf are available. the converters incorporate a fixed frequency single for- ward topology with magnetic feedback and an internal emi filter. these converters are capable of meeting the conducted emissions and conducted susceptibility re- quirements of mil-std-461c without any additional components. all models include an external inhibit port and have an adjustable output voltage. they are en- closed in a hermetic 3.0" x 2.5" x 0.445" steel package and weigh less than 125 grams. the package utilizes rugged ceramic feed-through copper core pins and is sealed using parallel seam welding. full environmental screening includes temperature cy- cling, constant acceleration, fine and gross leak, and burn-in. non-flight versions of the h-series converters are avail- able for system development purposes. variations in electrical specifications and screening to meet custom requirements can be accommodated. applications low earth orbit satellites (leo) launch vehicles pd - 94437a
2 www.irf.com h-series the h-series converters utilize a single forward to- pology 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 mecha- nism limits the maximum output voltage to approxi- mately 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 17 volts and will shut down when the input voltage drops below 16 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 converter?s operation is inhib- ited when this pin is pulled low. it is intended to be driven by an open collector logic device. the pin may be left open for normal operation and has a nominal open circuit voltage of 10.5v with respect to the input return (pin 2). single output models feature remote sense to auto- matically correct for voltage drops between the con- verter output anf the load. the output voltage of dual output models can be adjusted using a single exter- nal resistor. design methodology the h-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. heavy derat- ing of the power mosfet gate and drain voltages minimize the possibility of segr and seb. a mag- netic feedback circuit is utilized instead of opto-cou- plers to minimize temperature, radiation and aging sensitivity. pspice was used extensively to predict and optimize circuit performance for both beginning and end-of-life. thorough design analyses include radiation susceptibility ( tree ), stress, thermal, and reliability ( mtbf ). www.irf.com 3 h-series input voltage range - -0.5vdc to +60vdc input voltage range - 18vdc to +40vdc output power - internally limited input voltage range 1 - 18vdc to +38vdc 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 *23 $242 *23 $ *23 $4 *23 - *23 - *23 $ *23 - *23 - *23 $242 *23 $ *23 $4 *23 - *23 - *23 $ *23 - *23 - - - - - - - - - #2 #2 #2 #2 #2 #2 #2 #2 /, -$$" % . /, -$$" % . 25 6 .57 5-6 --5 -.5 !.57 !--5 !-.5 25 2 .57$ 5-2 --568 -.56$ !.57$ !--568 !-.56$ 252$ 5$$ 5 $ - 5$$ -5$$ !5$$ !- 5$$ !-5$$ 2522 5$ 5 2 - 5- -5- !5$ !- 5- !-5- 2526 5-$ 5 6 - 5 . -52$ !5-$ !- 5 . !-52$ / ' 0 /, 1 *23 $242 %%/& -# #2 -# #.$ %# $ $ 2$ .$ 9 9 / ( 0 /, 1 *23 $242 *23 $ *23 $4 *23 - *23 - *23 $ *23 - *23 - -# #2 -# #.$ %# :& / # 2 :& / # 2 :& / # 2 $ $ $ $ $ $ $ $ 75-$ 5$$ 656$ 252. 586 85.$ 586 5-. % 04 : 1 -# #2 -# #.$ % /, $#$"#-$$" # . $5 $5 " % 04 / 1 -# #2 /, $#$"#-$$" # . -# #.$ % -5$ -5$ " % 04 4/ 1 *23 $ *23 - *23 - -# #2 % %;# -# #.$ % 5$ 25$ 25$ 5$ 25$ 25$ " " " 4 www.irf.com h-series electrical performance characteristics ( continued ) for notes to specifications, refer to page 5 !"# $ % & ' () * *+ , / 4% 0 1 *23 $242 *23 $ *23 $4 *23 - *23 - *23 $ *23 - *23 - -# #2 -# #.$ % /, -$$" % .#8 2 $ $ 6$ $ $ $ $ ( # % 0 1 *23 $242 *23 $ *23 $4 *23 - *23 - *23 $ *23 - *23 - -# #2 /, $#. 8$ 6$ 6$ 6$ 6$ 6$ -$$ -$$ ( & -# #2 .& '(&) < (;0= 1 -# #2 .$ $$ $ >3? :))( (;0: == 1 *23 $242 *23 $ *23 $4 *23 - *23 - *23 $ *23 - *23 - -# #2 /, -$$" % . 8 66 66 6 6 66 6 6 62 $ $ - $ - " " " " " " " " :% 0 &= ( 1 ( ( @ % @ ( 0a1 @ % -# #2 - 75 $5 --5 $$ $ :+ ( )) %% % ( -# #2 7$" ) %# . -$ -2$ " ' #% ) %0 1 -# #2 & ( #/@ % # - 9 / % (& 0 1 .##8 3%) b) = %% # .#7 2$$ 2$$ a 4 ( @ ; # % (& 0 1 .##8 3%) b) = %% # .#7#-$ $$ / % (& 0 1 .##8 - b) .$ /, -$$" % # -#.#-- 2$$ 2$$ a 4 ( @ ; # % (& 0 1 .##8 - b) .$ /, -$$" % # -#.#-$#-- $$ 4 /@ & 0 / 1 %;0 c 1 .##8 #= %% .#- $$ -$ www.irf.com 5 h-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) output load current must be distributed such that at least 20% of the total load current is being provided by one of the outp uts. 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 using the circuit shown below. 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 d uring 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 pi n (pin 4) to the point where v out = 90% of nominal. 13) for operation at temperatures between +85c and +125c, derate the maximum output power linearly from 100% to 75%. * "# $ ,% & ' () * *+ , (@ 01 *23 $242 *23 $ *23 $$4 *23 - *23 - *23 $ *23 - *23 - - /, -$$" % )) ( ) ( -#.#6 :(& % $$ -$$$ -$$$ -$ - $ $$ 7$ 8$ d= d= d= d= d= d= d= d= 4 e ( - /, -$$" % $>3?# -#. .$ $ f % - / ; +( 2# g$$ -$$ * ? @( 9 & - *f= * 3 f> -6= #=#2 -5+-$ 8 3 6 www.irf.com h-series radiation performance characteristics device screening test conditions min typ highest level tested unit total ionizing dose ( gamma ) mil-std-883, method 1019 operating bias applied during exposure, full rated load, v in = 28v 25 40 60 krads (si) single event effects seu, sel, segr, seb heavy ions (let) operating bias applied during exposure, full rated load, v in = 28v 37 82 82 mev ? cm 2 /mg dose rate ( gamma dot ) temporary saturation survival mil-std-883, method 1023 operating bias applied during exposure, full rated load, v in = 28v 1e8 1e10 1.5e9 rads (si)/sec neutron fluence mil-std-883, method 1017 3e12 8e12 neutrons /cm 2 proton fluence e > 10mev tbd n/a protons /cm 2 test inspection method condition element evaluation mil-prf-38534 class h equivalent with sem nondestructive bond pull mil-std-883, method 2023 internal visual mil-std-883, method 2017 temperature cycling mil-std-883, method 1010 c constant acceleration mil-std-883, method 2001 (2k-g) a, y1 axis only electrical in accordance with device specification burn-in mil-std-883, method 1015 160 hours final electrical ( group a ) in accordance with device specification seal fine leak gross leak mil-std-883, method 1014 a1 c external visual mil-std-883, method 2009 www.irf.com 7 h-series block diagram - single output rs ea + - + - -sense 10 +sense 9 return +output 12 13 1 2 vin return bias supply emi filter +10.5v sample & hold feedback trigger ramp gen. pwm controller 3 inhibit under voltage lockout & inhibit 6 case ground 2 sync. output ( for test use only ) block diagram - dual output adjus t 8 ea + - 1 2 vin r eturn bias supply emi filter +10.5v sample & hold feedback trigger ramp gen. pwm controller 3 inhibit under voltage lockout & inhibit 6 case grou n 2 tput s e only ) 12 11 +out p retu r 13 -outp u 8 www.irf.com h-series 0 10 20 30 40 50 60 70 80 90 100 db-ua 1e3 1e4 1e5 1e6 1e7 1e8 frequency ( hz ) ceo3 limit 0 10 20 30 40 50 60 70 80 90 100 db-ua 1e3 1e4 1e5 1e6 1e7 1e8 frequency ( hz ) ceo3 limit conducted emmissions, common mode conducted emmissions, normal mode www.irf.com 9 h-series -120 -100 -80 -60 -40 -20 0 db 1e2 1e3 1e4 1e5 frequency ( hz ) full rated load output return dut 50 ohm back term. 0.1 uf 50 ohm coax. 50 ohm term. 1 uf oscilloscope or equivalent with 10 mhz bandwidth. multiply readings by 2. note : specification guaranteed to 20mhz bandwidth. circuit for measuring output ripple voltage line rejections, 28vdc + 8vac-p 10 www.irf.com h-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. 02/03 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 nc pin 11 nc/ -output pin 5 sync. output (t.p.) pin 12 output return pin 6 case ground pin 13 +output pin 7 nc m3h 28 05 s model nominal input volta g e 28 = 28v outputs s = sin g le d = dual nominal output volta g es 03r3 = 3.3v, 05r2 = 5.2v 05 = 5v, 12 = 12v, 15 =15v |
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