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www.irf.com 1 hybrid - high reliability radiation hardened dc-dc converters arh28xxs series description total dose > 100 krad (si), 2:1 margin see hardened to let up to 83 mev . cm 2 /mg derated per mil-std-975 & mil-std-1547 output power to 30 watts regulates to no-load 18 to 50 volt input range input undervoltage lockout fully characterized from -55c to +125c continuous short circuit protection 12.8 w/in 3 output power density true hermetic package external inhibit port externally synchronizable fault tolerant design available with outputs from 2.5v to 15v overload protection standard microcircuit drawings available features arh 28v input, single output the arh series of dc-dc converters has been designed specifically for use in the hostile environments the high level of radiation tolerance inherent in the arh design is the result of extensive research, thorough analysis and testing and of careful component specification. designed to supplement the triple output configuration provided by the art series, the arh circuit topology is the follow-on to the successful art design and incorporates many of the design features characterizing that product line. capable of uniform high performance over long term exposures in radiation intense environments, this series expands the standard for distributed power systems demanding high performance and reliability in the harsh environments. the arh converters are hermetically sealed in a rugged, low profile package utilizing copper core input and output pins to minimize resistive dc losses. long- term hermeticity is assured through use of parallel seam welded lid attachment along with rugged ceramic pin- to-package seal. axial orientation of the leads facilitates preferred bulkhead mounting placing the converter on the principal heat-dissipating surface. manufactured in a facility fully qualified to mil-prf- 38534, these converters are fabricated utilizing dla land and martiime qualified processes. for available screening options, refer to device screening table in the data sheet. variations in electrical, mechanical and screening specifications can be accommodated. contact ir san jose for special requirements. pd-95887b
2 www.irf.com arh28xxs series 28v input, single output specifications electrical performance -55c < t case < +125c, v in = 28v , c l = 0 unless otherwise specified. for notes to specifications, refer to page 4 parameter symbol test conditions limit min limit max units output voltage accuracy arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s v out p out = 30 w, t c = +25 c 2.487 3.283 4.975 5.174 11.940 14.925 2.513 3.317 5.025 5.226 12.060 15.075 vdc output power p out 18 vdc < v in < 50vdc 0 30 w output current arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s i out 18 vdc < v in < 50vdc 0 0 0 0 0 0 12000 9090 6000 5770 2500 2000 madc line regulation note 3 vr line 18 vdc < v in < 50vdc, 0 < i out < i max -1.0 +1.0 % load regulation note 4 vr load 18 vdc < v in < 50vdc, 0 < i out < i max -2.0 +2.0 % total regulation vr all conditions of line, load, temperature, radiation and end of life -4.0 +4.0 % no-load input current i in i out = 0 (pin 3 open) inhibited (pin 3 shorted to pin 2) ? ? 100 8.0 ma output ripple and noise voltage note 5 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s v rip 18 vdc < v in < 50vdc, i out = i max 30 30 40 40 50 50 mv p.p +18v to +60vdc +18v to +50v for full derating to mil-std-1547 soldering temperature 300c for 10 seconds output power 0 to 30w storage case temperature -65c to +135c -55c to +125c -55c to +85c for full derating to mil-std-975 operating case temperature recommended operating conditions absolute maximum ratings input voltage range -0.5v to +80vdc input voltage range
www.irf.com 3 arh28xxs series 28v input, single output for notes to specifications, refer to page 4 electrical performance -55c < t case < +125c, v in = 28v , c l = 0 unless otherwise specified. (continued) parameter symbol test conditions limit min limit max units input ripple current note 5 i rip 18 vdc < v in < 50vdc, i out = i max 100 ma p.p switching frequency f s synchronization input open. (pin 6) 225 275 khz efficiency arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s eff i out = i max , t c = +25 c 72 75 76 76 80 80 % enable input open circuit voltage drive current (sink) voltage range 3.0 -0.5 5.0 100 50 v a v synchronization input frequency range pulse high level pulse low level pulse rise time pulse duty cycle external clock signal on sync. input (pin 4) 225 3.5 -0.5 40 20 310 10 0.25 80 khz v v v/ s % synchronization output pulse high level signal compatible with synchronization input 3.7 4.3 v power dissipation, short circuit arh2802r5s arh2803r3s & arh2805s all others p d short circuit on output 10 12 9.5 w output response to step load changes note 8 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s v tld 50% load ? 100% load -200 -200 -200 -200 -300 -350 200 200 200 200 300 350 mv pk recovery time from step load changes notes 8, 9 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s t tld 50% load ? 100% load 200 200 200 200 200 200 s output response to step line changes notes 7, 10 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s v tln i out = i max , v in = 18 v to/from 50 v -180 -180 -250 -250 -450 -900 180 180 250 250 450 900 mv pk
4 www.irf.com arh28xxs series 28v input, single output electrical performance -55c < t case < +125c, v in = 28v , c l = 0 unless otherwise specified. (continued) parameter symbol test conditions limit min limit max units recovery time from step line changes notes 7, 9, 10 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s t tln i out = i max , v in = 18 v to/from 50 v 600 600 700 700 320 400 s turn on overshoot v os i out = 10% or 100% of i max 5.0 %v out turn on delay note 11 t dly i out = 10% or 100% of i max 2.0 20 ms capacitive load notes 6, 7 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s cl no effect on dc performance 1200 1200 1000 1000 180 120 f isolation iso 500vdc input to output or any pin to case 100 m ? recovery from a short circuit vr output shorted, then open into max rated load current. vin = 28 v 10 % of rated output voltage overload trip current ovld maximum current at specified output voltage 105 135 % of max output current notes to specifications tables 1. operation outside absolute maximum/minimum limits may cause permanent damage to the device. extended operation at the limits may permanently degrade performance and affect reliability. 2. device performance specified in electrical performance table is guaranteed when operated within recommended limits. ope ration outside recommended limits is not specified. 3. parameter measured from 28v to 18v or to 50v while load remains fixed at 10%, 50% and 100% of imax. 4. parameter measured from 50% to 10% or 100% of maximum load conditions while line remains fixed at 18, 28 or 50 volts. 5. guaranteed for a bandwidth of dc to 20 mhz. tested using a 20 khz to 2.0 mhz bandwidth. 6. a capacitive load of any value from 0 to the specified maximum is permitted without compromise to dc performance. a capacitive load in excess of the maximum limit may interfere with the proper operation of the converter?s short circuit protect ion, causing erratic behavior during turn on. 7. parameter is tested as part of design characterization or after design or process changes. thereafter, parameters shal l be guaranteed to the limits specified in the table. 8. load transient rate of change, di/dt 2.0 a/s. 9. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of its steady state value. 10. line transient rate of change, dv/dt 50 v/s. 11. turn on delay time is for either a step application of input power or a logical low to high transition on the enable pin ( pin 3) while power is present at the input.
www.irf.com 5 arh28xxs series 28v input, single output group a tests v in = 28v, c l = 0 unless otherwise specified. for notes to group a tests, refer to page 6 test symbol test conditions group a subgroups limit min limit max units output voltage accuracy arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s v out i out = i max , t c = 25 c 1 2.487 3.283 4.975 5.174 11.940 14.925 2.513 3.317 5.025 5.226 12.060 15.075 v output power note 1 p out v in = 18 v, 28v, 50 v 1, 2, 3 0 30 w output current note 1 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s i out v in = 18 v, 28v, 50 v 1, 2, 3 0 0 0 0 0 0 12000 9090 6000 5770 2500 2000 ma output regulation note 4 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s vr i out = 10%, 50%, 100% of i max v in = 18 v, 28v, 50 v 1, 2, 3 2.425 3.201 4.850 5.044 11.640 14.550 2.575 3.399 5.150 5.356 12.360 15.450 v no load input current i in i out = 0, pin 3 open pin 3 shorted to pin 2 (disabled) 1, 2, 3 1, 2, 3 100 8.0 ma output ripple note 2 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s v rip v in = 18 v, 28v, 50 v i out = i max 1, 2, 3 30 30 40 40 50 50 mv p-p switching frequency f s synchronization pin (pin 6) open 4, 5, 6 225 275 khz input ripple note 2 i rip v in = 18 v, 28v, 50 v i out = i max 1, 2, 3 100 ma p-p recovery from a short circuit vr output shorted, then open into max rated load current. vin = 28 v 5.0 % of rated output voltage overload trip current ovld maximum current at specified output voltage 1, 2, 3 105 135 % of max output current
6 www.irf.com arh28xxs series 28v input, single output group a tests v in = 28v, c l = 0 unless otherwise specified. (continued) test symbol test conditions group a subgroups limit min limit max units efficiency arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s eff i out = i max 1 2, 3 72 75 76 76 80 80 68 68 72 72 78 78 % power dissipation, short circuit arh2802r5s arh2803r3s & arh2805 all others p d short circuit across output 1, 2, 3 10 12 9.5 w output response to step load changes note 5 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s v tl 50% load to/from 100% load 4, 5, 6 -200 -200 -200 -200 -300 -350 200 200 200 200 300 350 mv pk recovery from step load changes notes 5, 6 arh2802r5s arh2803r3s arh2805s arh2805r2s arh2812s arh2815s t tl 50% load to/from 100% load 4, 5, 6 200 200 200 200 200 200 s turn on overshoot v os i out = 10% and 100% 4, 5, 6 5.0 %v out turn on delay note 7 t dly i out = minimum and full rated 4, 5, 6 2.0 20 ms isolation iso 500vdc input to output or any pin to case (except pin 12) 1 100 m ? notes to specifications tables 1. paramete verified during dynamic load regulation tests. 2. guranteed for dc to 20 mhz bandwidth. test conducted using a 20 khz to 2.0mhz bandwidth. 3. deleted . 4. output is measured for all combinations of line and load. only the minimum and meximum readings for the ouput are record ed. 5. load step transition time is 10 s. 6. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of its steady state value. 7. turn on delay time is tested by application of a logical low on high transition on teh enable pin (pin 3) with power pres ent at the input. 8. subgroups 1 and 4 are performed at +25c, subgroups 2 and 5 at +85c and subgroups 3 and 6 at -55c.
www.irf.com 7 arh28xxs series 28v input, single output circuit operation and application information the arh28xxs series of converters have been designed using a single ended forward switched mode converter topology. (refer to figure i.) single ended topologies enjoy certain advantages in radiation hardened designs in that they eliminate the possibility of simultaneous turn on of both switching elements during a radiation induced upset. in addition, single ended topologies are not subject to transformer saturation problems often associated with double ended implementations. figure i. block diagram the design incorporates a two-stage lc input filter to attenuate input ripple current. a low overhead linear bias regulator provides both a bias voltage for the converter primary control logic and a stable, well-regulated reference for the error amplifier. output control is realized using a wide band discrete pulse width modulator control circuit incorporating a unique non-linear ramp generator circuit. this circuit helps stabilize loop gain over variations in line voltage for superior output transient response. nominal conversion frequency has been selected as 250 khz to maximize efficiency and minimize magnetic element size. output voltages are sensed and fed back to the controller using a patented magnetic feedback circuit. this circuit is designed to be relatively insensitive to variations in temperature, aging, radiation and manufacturing tolerances making it particularly well suited to radiation hardened designs. the control logic has been designed to use only radiation tolerant components, and current paths include series resistances to limit photocurrents. other key circuit design features include output short circuit and overload protection, input undervoltage lockout and an external synchronization input port, permitting operation at an externally set clock rate. alternately, a synchronization output is provided to lock frequencies with another converter when using more than one converter in a system. the arh series of converters is capable of providing relatively high output power from a package of modest volume. the power density exhibited by these devices is obtained by combining high circuit efficiency with effective methods of heat removal from the die junctions. good design practices have effectively addressed this requirement inside the device. however when operating at maximum loads, heat generated at the die junctions depends upon minimally restricted thermal conduction from the base plate for that heat to be carried away. to maintain case temperature at or below the specified maximum of 125c, this heat can be transferred by attachment of the arh28xxs to an appropriate heat dissipater held in intimate contact with the converter base-plate. thermal considerations effectiveness of this heat transfer is dependent on the intimacy of the baseplate to heatsink interface. it is therefore suggested that a heat-transferring medium possessing good thermal conductivity be inserted between the baseplate and heatsink. a material utilized at the factory during testing and burn-in processes is sold under the 11 13 sample & hold +vout output return overload & short circuit pulse width modulator primary bias & reference emi filter under-voltage detector 1 3 4 2 +input enable sync in input return level translator & buffer error amp + - 10 9 +sense -sense 5 sync out 12 14
8 www.irf.com arh28xxs series 28v input, single output trade name of sil-pad ? 400 1 . this particular product is an insulator but electrically conductive versions are also available. use of these materials assures optimum surface contact with the heat dissipater by compensating for minor surface variations. while other available types of heat conducting materials and thermal compounds provide similar effectiveness, these alternatives are often less convenient and are sometimes messy to use. a conservative aid to estimating the total heat sink surface area (a heat sink ) required to set the maximum case temperature rise (dt) above ambient temperature is given by the following expression: ? t pp eff out = ==? ? ? ? ? ? ? case temperature rise above ambient device dissipation in watts 1 1 where a heat sink ? ? ? ? ? ? ? ? ? t p 80 594 085 143 . . .

!" #$%& ' & ( #$%) ? $ * from the specification table, the worst case full load efficiency for this device is 80%; therefore the maximum power dissipation at full load is given by () p =? ? ? ? ? ? ? ? =? = 30 1 80 13002575 . ..w and the required heat sink area is a = 35 80 7.5 in heat sink 0.85 ? ? ? ? ? ? ? ?= ? 143 2 594 318 . .. thus, a total heat sink surface area (including fins, if any) of approximately 32 in 2 in this example, would limit case rise to 35c above ambient. a flat aluminum plate, 0.25" thick and of approximate dimension 4" by 4" (16 in 2 per side) would suffice for this application in a still air environment. note that to meet the criteria, both sides of the plate require unrestricted exposure to the ambient air. the user should remember that when operating in the vacuum of space, this method does not apply and all heat must be conducted away from the attaching surface. 1 sil-pad is a registered trade mark of bergquist, minneapolis, mn as an alternative to application and removal of the dc voltage at the input, the user can control the converter output by providing an input referenced, ttl compatible, logic signal to the enable pin 3. this port is internally pulled ?high? so that when not used, an open connection on the pin permits normal converter operation. when inhibited outputs are desired, a logical ?low? on this port will shut the converter down. an open collector device capable of sinking at least 100 a connected to enable pin 3 will work well in this application. inhibiting converter output a benefit of utilization of the enable input is that following an initial charge of the input capacitor, subsequent turn-on commands will induce no uncontrolled current inrush. figure ii. enable input equivalent circuit synchronization when using multiple converters, system requirements may dictate operating several converters at a common system frequency. to accommodate this requirement, the arh28xxs type converter provides a synchronization input port. the sync input port permits synchronization of an arh converter to any compatible external frequency source operating in the band of 225 to 310 khz. in the event of failure of an external synchronization source, the converter will revert to its own internally set frequency. when external synchronization is not desired, the sync in port may be left open (unconnected) permitting the converter to operate at its own internally set frequency.
www.irf.com 9 arh28xxs series 28v input, single output when an external frequency source is not available, an internal clock signal is provided through appropriate buffering at the sync out port. this port can drive a minimum of 3 arh sync in ports thereby allowing all to operate at the same clock frequency. output short circuit protection + ' ,
!--",* . (/ ' / &' '&'&& * . , & , * 0 & / '* input undervoltage protection input filter figure iii. input filter emi filtering output noise although the internal filtering provided at both input and output terminals of the arh series converters is sufficient for most applications, some critical applications may require additional filtering in order to accommodate particular system requirements. while the internal input filter maintains input ripple current below 50 ma p-p, an external filter can be applied to further attenuate this ripple to a level below the ce03 limits imposed by mil-std-461. international rectifier currently supplies such a filter housed in a complementary package. the catalog number of this part is arf461. when attempting noise measurement at the output of switching converters, measurement techniques employed can have a significant influence on results during these tests. any noise measurements should be undertaken only with test leads dressed as close to the device output pins as is physically possible. probe ground leads should be kept to a minimum (<< 1") length to minimize the influence of parasitic impedances on results. to attenuate input ripple current, the arh28xxs series converters incorporate a two-stage lc input filter illustrated in figure iii following. the elements of this filter comprise the dominant input load impedance characteristic, and therefore determine the nature of the current inrush at turn-on. a minimum voltage is required at the input of the converter to initiate operation. this voltage is set to a nominal value of 16.8 volts. to preclude the possibility of noise or other voltage variations at the input falsely initiating and halting converter operation, a hysteresis of approximately 1.0 volts is incorporated into this circuit. the converter is guaranteed to operate at 18 volts input under all specified conditions.
10 www.irf.com arh28xxs series 28v input, single output radiation performance the radiation tolerance characteristics inherent in the arh28xxs converters are a result of a carefully planned ground-up design program with specific radiation design goals. identification of the general circuit topology, a fundamental task in the design effort, was followed by selection of appropriate elements from a list of devices for which extensive radiation effects data was available. by imposing sufficiently large margins on those electrical parameters showing the worst case degrading effects of radiation, designers were able to select appropriate elements for incorporation into the circuit. existing radiation data was utilized for input to pspice and radspice in the generation of circuit performance verification analyses. thus, electrical performance capability under all environmental conditions including radiation was well understood before first application of power to the inputs. the following table specifies guaranteed minimum radiation exposure levels tolerated while maintaining specification limits. a principal design goal was achieving a converter topology that, because of large design margins, had radiation performance essentially independent of radiation induced element-lot performance variations. where such margins cannot be assured, element lots are either selected following rlat characterization as radiation hard devices or, purchased as radiation hard devices so that realization of the design goals are maintained. . radiation specification tcase = 25c international rectifier currently does not have a dla land and maritime certified radiation hardness assurance program. * group b quantity for option 2 end of line qci. no group b samples required for option 1, in-line. standard quality conformance inspections on arh28xxs series (filght screened) inspection application samples group a part of screening on each unit 100% group b each inspection lot * 5 units group c first inspection lot or following class 1 change 10 units group d in line (part of element evaluation) 3 units test conditions min typ unit mil-std-883, method 1019.4 total ionizing dose (2.:1 margin) operating bias applied during exposure 100 krads(si) dose rate mil-std-883, method 1021 temporary saturation 1e8 rads(si)/sec survival 1e11 heavy ions bnl dual van de graf generator (single event effects) 83 mev cm 2 /mg
www.irf.com 11 arh28xxs series 28v input, single output mechanical outline pin designation pin # designation 1 + input 2 input return 3 enable 4sync in 5sync out 8 chassis 9 -sense 10 +sense 11 +v output 12 +v output 13 output return 14 output return standard microcircuit drawing equivalence table standard microcircuit ir standard drawing number part number 5962-04232 arh2805s 5962-04233 arh2803r3s note: 1. dimensions are in inches. 2. base plate mounting plane flatness 0.003 maximum. 3. unless otherwise specified, tolerances are = 2 .xx = .01 .xxx = .005 4. device weight - 120 grams maximum. 0.138 6 x 0 .200 =1.200 0.050 0.500 max. 3.25 ref. max
1.675 2 .200 0.300 2.400 2.700 1.950 1.40 0.275 max. 0.150 0.375 0.040 pin dia. ? 0.136 ? 6 holes
12 www.irf.com arh28xxs series 28v input, single output part numbering arh 28 05 s /em model input voltage nominal 28 = 28v output s = single d = dual output voltage 02r5 = 2.5v, 03r3 = 3.3v 05 = 5v, 05r2 = 5.2v 12 = 12v, 15 = 15v screening level (please refer to screening table) no suffix, ck, em 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 notes: best commercial p ractice. ck is dla class k compliant without radiation performance. no suffix is a radiation rated device but not available as a dla qualified smd per mil-prf-38534. international rectifier currently does not have a dla certified radiation hardness assurance program. world headquarters: 101 n, sepulveda blvd., el segundo, california 90245, usa tel: (310) 252-7105 ir san jose: 2520 junction avenue, san jose, california 95134, usa tel: (408) 434-5000 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 06/2013

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