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? hybrid-high reliability radiation tolerant dc-dc converter arh arh28xxxxs series description 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 re search, 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 powe r 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 hermetically is assured through use of parallel seam welded lid attachment along with rugged ceramic pin-to-package seal. axial orientation of the leads facilitat es preferred bulkhead mounting placing the converter on the principal heat-dissipating surface. manufactured in a facility fully qu alified to mil-prf-38534, these converters are fabricated utilizing dla land and maritime 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 hirel san jose for special requirements. 1 2016-06-29 pd-95887c 28v input, single output features ? ? total dose > 100 krads(si), 2:1 margin ? ? see hardened to let up to 83 mev . cm 2 /mg ? ? de-rated per mil-std-975 & mil-std-1547 ? ? output power to 30 watts ? ? regulates to no-load ? ? 18 to 50 volt input range ? ? input under voltage 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 synchronization ? ? fault tolerant design ? ? available with outputs from 2.5v to 15v ? ? overload protection ? ? standard microcircuit drawings available
arh28xxxxs series (28v input, single output) 2 2016-06-29 specifications absolute maximum ratings note 1 ? recommended operating conditions ?? note 2 ? input voltage range -0.5v dc to +80v dc input voltage range +18v dc to +60v dc +18v to +50v for full de-rating 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 de-rating to mil-std-975 operating case temperature static characteristics -55c t case +125c, v in = 28v dc 5%, c l = 0, unless otherwise specified . for notes to electrical performance characteristics, refer to page 4 parameter symbol test conditions limits min. max. output voltage ARH2802R5S arh2803r3s arh2805s arh2805r2s arh2812s arh2815s v out p out = 30w, t c = +25c 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 dc output power p out 18v dc < v in < 50v dc 0 30 w output current ARH2802R5S arh2803r3s arh2805s arh2805r2s arh2812s arh2815s i out 18v dc < v in < 50v dc 0 0 0 0 0 0 12000 9090 6000 5770 2500 2000 ma dc line regulation note 3 vr line 18 v dc < v in < 50v dc , 0 < i out < i max -1.0 +1.0 % load regulation note 4 vr load 18 v dc < v in < 50v dc , 0 < i out < i max -2.0 +2.0 % total regulation v r 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 v dc < v in < 50v dc , i out = i max 30 30 40 40 50 50 mv p.p unit input ripple current note 5 i rp 18 v dc < v in < 50v dc , i out = i max 100 mapp switching frequency f s synchronization input open. (pin 6) 225 275 khz
arh28xxxxs series (28v input, single output) 3 2016-06-29 static characteristics (continued) -55c t case +125c,v in = 28v dc 5%, c l =0, unless otherwise specified . for notes to electrical performance characteristics, refer to page 4 parameter symbol test conditions limits unit min. max. efficiency ARH2802R5S arh2803r3s arh2805s arh2805r2s arh2812s arh2815s e ff i out = i max , t c = +25c 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
arh28xxxxs series (28v input, single output) 4 2016-06-29 notes to specifications 1. operation outside absolut e 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 tabl e is guaranteed when operated with in recommended limits. operatio n outside recommended limits is not specified. 3. parameter measured from 28v to 18v or to 50v wh ile load remains fixed at 10%, 50% and 100% of imax. 4. parameter measured from 50% to 10% or 100% of maximum lo ad 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 capaciti ve load in excess of the maximum limit may interfere with the prop er operation of the converter?s short circuit protection, causi ng erratic behavior during turn on. 7. parameter is tested as part of design characterization or a fter design or process changes. thereafter, parameters shall be guaranteed to the limits sp ecified 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. static characteristics (continued) -55c t case +125c,v in = 28v dc 5%, c l =0, unless otherwise specified . parameter symbol test conditions limits min. max. 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 c l no effect on dc performance 1200 1200 1000 1000 180 120 f isolation i so 500v dc input to output or any pin to case 100 m ? recovery from a short circuit v r output shorted, then open into max rated load current. vin = 28v 10 % of rated output voltage overload trip current o vld maximum current at specified output voltage 105 135 % of max output current unit 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
arh28xxxxs series (28v input, single output) 5 2016-06-29 group a tests v in = 28v, c l = 0 unless otherwise specified. parameter symbol test conditions group a subgroups limits min. max. output voltage accuracy ARH2802R5S arh2803r3s arh2805s arh2805r2s arh2812s arh2815s v out i out = i max , t c = 25c 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 v r 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 v r output shorted, then open into max rated load current. v in = 28 v 5.0 % of rated output voltage overload trip current o vld maximum current at specified output voltage 1, 2, 3 105 135 % of max output current unit for notes to group a tests, refer to page 6.
arh28xxxxs series (28v input, single output) 6 2016-06-29 group a tests (continued) v in = 28v, c l = 0 unless otherwise specified. parameter symbol group a subgroups limits unit min. max. 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 i so 500v dc input to output or any pin to case (except pin 12) 1 100 m ? test conditions efficiency ARH2802R5S arh2803r3s arh2805s arh2805r2s arh2812s arh2815s ARH2802R5S arh2803r3s arh2805s arh2805r2s arh2812s arh2815s e ff i out = i max 1 2, 3 72 75 76 76 80 80 68 68 72 72 78 78 % notes to specifications tables 1. parameter verified during dynamic load regulation tests. 2. guaranteed for dc to 20 mhz bandwidth. test c onducted using a 20 hz to 2.0mhz bandwidth. 3. deleted. 4. output is measured for all combinati ons of line and load. only the minimum and maximum readings for the output are recorded. 5. load step transition time is 10 ? s. 6. recovery time is measured from the in itiation 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 lo w on high transition on the enable pin (pin 3) with power presen t at the input. 8. subgroups 1 and 4 are performed at +25c, subgroups 2 and 5 at +85 c and subgroups 3 and 6 at -55c.
arh28xxxxs series (28v input, single output) 7 2016-06-29 fig i. block diagram circuit operation and application information the arh28xxxxs series of converters have been designed using a single ended forward switched mode converter topology. (refer to fig 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. 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 under voltage 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. thermal considerations the arh series of converters is capable of providing relatively high output power from a package of modest volume. the power density exhibited by t hese 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 arh28xxxxs to an approp riate heat dissipater held in intimate contact with the converter base-plate. effectiveness of this heat transfer is dependent on the intimacy of the baseplate to heat sink interface. it is therefore suggested that a heat-transferring medium possessing good thermal conductivity be inserted between the baseplate and heat sink. a material utilized at the factory during testing and burn-in processes is sold under the trade name of sil-pad ? 4001.this particular product is an insulator but electrically conductive versions are also available. use of these materials assures optimum surface contac t with the heat dissipater by compensating for minor surface variations.
arh28xxxxs series (28v input, single output) 8 2016-06-29 while other available types of heat conducting materials and thermal compounds provi de 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 maximu m case temperature rise ( ? t) above ambient temperature is given by the following expres- sion: where as an example, assume that it is desired to maintain the case temperature of an arh2815s at +65c or less while operating in an open area whose ambient temperature does not exceed +35c; then ? t = 65 - 35 = 35c. 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 and the required heat sink area is thus, a total heat sink surface area (including fins, if any) of approximately 32 in2 in this example, would limit case rise to 35c above ambient. a flat aluminum plate, 0.25" thick and of approximate dimens ion 4" by 4" (16 in2 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. a heat sink ? ? ? ? ? ? ? ? ? ? t p 80 594 085 143 . . . ?t pp eff out ? ??? ? ? ? ? ? ? ?? p ?? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ?? ? 1 sil-pad is a registered trade mark of bergquist, minneapolis, mn inhibiting converter output 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 he converter down. an open collector device capable of sinking at least 100 a connected to enable pin 3 will work well in this application. a benefit of utilization of the enable input is that following an initial charge of the input c apacitor, 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 severa l converters at a common system frequency. to accommodate this requirement, the arh28xxxxs 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. 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.
arh28xxxxs series (28v input, single output) 9 2016-06-29 output short circuit protection protection against accidental short circuits on the output is provided in the arh28xxxxs converter. this protection is implemented by sensing primary switching current and reducing the switching pulse widths when a short occurs. the output current is therefore limited to a maximum value, which protects the converter. under this condition the internal power dissipation is nearly the same as for maximum loading. input under voltage protection 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 hyster esis of approximately 1.0 volts is incorporated into th is circuit. the converter is guaranteed to operate at 18 volts input under all specified conditions. input filter to attenuate input ripple current, the arh28xxxxs series converters incorporate a two-stage lc input filter illustrated in fig. iii following. the elements of this filter comprise the domi- nant input load impedance characteristic, and therefore determine the nature of the current inrush at turn-on. figure iii. input filter output noise 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. emi filtering 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 50map-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 rectifie r currently supplie s such a filter housed in a complementary package. the catalog number of this part is arf461.
arh28xxxxs series (28v input, single output) 10 2016-06-29 radiation specification tcase = 25c parameter condition min typ max unit total ionizing dose (2 :1 margin) mil-std-883, method 1019.4 operating bias applied during exposure 100 krads (si) heavy ion (single event effects) bnl dual van de graf generator 83 mev cm 2 /mg dose rate temporary saturation survival mil-std-883, method 1021 1e8 1e11 rads(si)/sec ir hirel currently does not have a dla cert ified radiation hardness assurance program. standard quality conformance inspectio ns on arh28xxxxs series (flight 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 * group b quantity for option 2 end of line qci. no group b samples required for option 1, in-line. radiation performance the radiation tolerance characteristics inherent in the arh28xxx xs converters are a result of a carefully planned ground-up design program with specific radiation design goals. identificatio n of the general circuit topology, a fundamental task in desi gn effort, was followed by selection of appropriate elements from a list of devices for which extensive radiation effects data wa s available. by imposing sufficiently large margins on those el ectrical parameters showing the worst case degrading effects of radiation, designers were able to select appropriate elem ents for incorporation into the circuit. existing radiation data was utilized for input to pspice and rad spice 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 p ower to the inputs. a principal design goal was achieving a converter topology that, because of large design margins, had radiation performance es sentially independent of radiation induced element-lot performance vari ations. 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. the following table specifies guaranteed minimum radiation exposure levels tolerated while maintaining specification limits.
arh28xxxxs series (28v input, single output) 11 2016-06-29 pin designation mechanical outline ? pin # designation pin # designation 1 + input 8 case ground 2 input return 9 -sense 3 enable 10 + sense 4 sync in 11 +v output 5 sync out 12 +v output 13 output return 14 output return standard microcircuit drawing equivalence table standard microcircuit drawing number ir hirel standard 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.
arh28xxxxs series (28v input, single output) 12 2016-06-29 device screening notes: ? best commercial practice. ? ck is a 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. ? any engineering model (em) build with the ?em? suffix shall only be form, fit and functional equivalent to its flight model (fm) counterpart, and it may not meet the radiation performance. the em model shall not be expected comply with mil-prf-38534 flight qual ity/workmanship standards, and configurat ion control. an em build may use electrical equivalent commercial grade components. ir hirel will provide a list of non-compliance items upon request. part numbering requirement mil-std-883 method no suffix ? ck ? em ? temperature range ? -55c to +85 c -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 burn-in 1015 320 hrs @ 125c (2 x 160 hrs) 320 hrs @ 125c (2 x 160 hrs) 48 hrs @ 125c final electrical (group a) mil-prf-38534 & specification -55c, +25c, +85c -55c, +25c, +85c -55c, +25c, +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 ? ir hirel headquarters: 101 n. sepulveda blvd., el segundo, california 90245, usa tel: (310) 252-7105 ir hirel leominster: 205 crawford st., leominster, massac husetts 01453, usa tel: (978) 534-5776 ir hirel san jose: 2520 junction avenue, san jose, california 95134, usa tel: (408) 434-5000 data and specifications subject to change without notice.
arh28xxxxs series (28v input, single output) 13 2016-06-29 important notice the information given in this document shall be in no event regarded as guarantee of conditions or characteristic. the data contained herein is a characterization of the co mponent based on internal standards and is intended to demonstrate and provide guidance for typical part performan ce. it will require further evaluation, qualification and analysis to determine suitability in the application environm ent to confirm compliance to your system requirements. with respect to any example hints or any typical values stat ed herein and/or any information regarding the application of the product, infineon technologies hereby disclaims any and a ll warranties and liabilities of any kind including without limitation warranties on non- infringement of inte llectual property rights and any third party. in addition, any information given in this document is subject to customer?s compliance with its obligations stated in this document and any applicable legal requirements, norms and standards concerning customer ?s product and any use of the product of infineon technologies in customer?s applications. the data contained in this document is exclusively intended fo r technically trained staff. it is the responsibility of any customer?s technical departments to evaluate the suitab ility of the product for the intended applications and the completeness of the product information given in this document with respect to applications. for further information on the product, technology, delivery terms and conditions and prices, please contact your local sales representative or go to ( www.infineon.com/hirel). warning due to technical requirements products may contain dangerou s substances. for information on the types in question, please contact your nearest infineon technologies office.

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