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  07/16/02 www.irf.com 1 advanced analog high reliability radiation hardened 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  triple output models include +5 and 12 or 15v  main output isolated from dual outputs  high efficiency - to 80%  -55c to +125c operating temperature range  100m ? @ 500vdc isolation  under-voltage lockout  short circuit and overload protection  output over voltage limiter  external inhibit  > 1,500,000 hour mtbf features +28v input, triple 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. electrical specifications and screening to meet custom requirements can be accommodated. applications  low earth orbit satellites (leo)  launch vehicles non-flight versions of the h-series converters are avail- able for system development purposes. variations in pd - 94518
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. 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 re- duces 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). 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 ). 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 main- tained through tight coupling in the power transformer and main output filter inductor and typically exhibit better than 5% regulation. the main output and aux- iliary 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 con- stant 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 tem- perature coefficient to reduce the possibility of ther- mal runaway.
www.irf.com 3 h-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 4 limits parameter group a subgroup conditions -55 c t c +85 c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit input voltage 1,2,3 note 2 18 28 50 v output voltage ( vout ) (main) 2812t (aux.) 2815t (aux.) (main) 2812t (aux.) 2815t (aux.) 1 2,3 i out = 100% rated load, note 5 i out = 100% rated load, note 5 4.98 11.50 14.60 4.93 11.30 14.40 5.00 11.80 14.90 5.02 12.10 15.20 5.07 12.30 15.40 v v v v v v output power ( p out ) 1,2,3 v in = 18, 28, 50 volts, note 2 0 40 w output current ( i out ) (main) 2812t (aux.) 2815t (aux.) 1,2,3 v in = 18, 28, 50 volts, notes 2,3,4,5 400 83 67 4000 833 667 ma ma ma line regulation ( vr line ) (main) 2812t (aux.) 2815t (aux.) 1,2,3 v in = 18, 28, 50 volts i out = 10%, 50%, 100% rated note 5 -10 -120 -150 10 120 150 mv mv mv load regulation ( vr load ) (main) 2812t (aux.) 2815t (aux.) 1,2,3 i out = 10%, 50%, 100% rated v in = 18, 28, 50 volts notes 5,13 -50 -400 -500 50 400 500 mv mv mv cross regulation ( vr cross ) 2812t (aux.) 2815t (aux.) 1,2,3 v in = 18, 28, 50 volts i out = 1a to 4a (main), 416ma on (aux.) i out = 1a to 4a (main), 333ma on (aux.) -3.5 -3.0 3.5 3.0 % % total regulation ( vr ) (main) 2812t (aux.) 2815t (aux.) 1,2,3 all conditions of line, load, and cross regulation, and temperature 4.90 11.00 13.50 5.10 13.00 16.50 v v v input current ( i in ) 1,2,3 i out = 0, pin 3 open 80 ma pin 3 shorted to pin 2 5 output ripple ( v rip ) (main) 2812t (aux.) 2815t (aux.) 1,2,3 v in = 18, 28, 50 volts i out = 100% rated load, notes 5, 6 25 30 30 50 60 75 mv p-p mv p-p mv p-p switching frequency ( f ) 1,2,3 sync. input (pin 4) open 450 500 550 khz efficiency (e ff ) 1,2,3 i out = 100% rated load; note 5 75 79 %
4 www.irf.com h-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 inhibit input open circuit voltage drive current ( sink ) voltage range 1,2,3 note 1 3.0 -0.5 5.0 100 50 v a v current limit point expressed as a percentage of full rated output power 1,2,3 v out = 90% of nominal, note 5 135 % 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 mv pk 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 ) 4,5,6 18v to/from 50v i out = 100% rated load, notes 1,5,11 -300 300 mv pk recovery time, step line changes (t tln ) 4,5,6 18v to/from 50v i out = 100% rated load, notes 1,5,10,11 200 s turn-on response overshoot (v os ) (main) ( aux. ) 4,5,6 no load, full load; notes 5 &12 500 750 mv mv turn-on delay (t dly ) 4,5,6 1 5 ms capacitive load (cl) (main) (each aux. output) 1 i out = 100% rated load, no effect on dc performance, notes 1, 5, 7 1000 200 f f 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 125 grams mtbf mil-hdbk-217f2, sf, 35 c 1.5 x 10 6 hours 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. although operation with no load is permissible, light loading on the main (+5 volt) output may cause the output voltage of the auxiliary outputs 4. (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. 5. although operation with no load is permissible, heavy loading on the main (+5 volt) output may cause the output voltage of the auxiliary outputs 6. (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. 7. 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 do es not to exceed 40 watts. 8. guaranteed for a d.c. to 20mhz bandwidth. tested using a 20khz to 10mhz bandwidth. 9. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. 10. a capacitive load in excess of the maximum limit may interfere with the proper operation of the converter?s overload protect ion, causing erratic behavior during turn-on. 11. overload power dissipation is defined as the device power dissipation with the load set such that v out = 90% of nominal. 12. load step transition time 10 sec. 13. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of 14. its steady state value. 15. line step transition time 100 sec. 16. turn-on delay time from either a step application of input power or a logic low to a logic high transition 17. on the inhibit pin (pin 3) to the point where v out = 90% of nominal. 18. 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. 19. 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%.
www.irf.com 5 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
6 www.irf.com h-series block diagram - triple output ref ea + - 7 main return +main 6 -aux. output 13 aux. return +aux. output 11 12 1 2 vin return bias supply emi filter +10.5v sample & hold feedback trigger ramp gen. pwm controller 3 inhibit under voltage lockout & inhibit 10 case ground 2 sync. output ( for test use only )
www.irf.com 7 h-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 regulaltion 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 regulaltion vs 5v load
8 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. 07/02 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 ouput) part number m3h 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 nc pin 2 input return pin 9 nc pin 3 inhibit pin10 case ground pin 4 nc pin 11 -aux. output pin 5 clock output (t.p.) pin 12 aux. output return pin 6 main return pin 13 +aux. output pin 7 +main output


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