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www.irf.com 1 description 18 to 40v dc input range total ionization dose > 100k rad(si) see hardened to let (heavy ions) up to 82 mev ? cm 2 /mg (seu, sel, segb, segr) internal emi filter; converter capable of meeting mil-std-461c ce03 low weight, < 80 grams magnetically coupled feedback up to 30w output power single and dual output models include 1.5, 2.5, 3.3, 5, 12, 15, 5, 12 and 15v high efficiency - to 83% 100m ? @ 500vdc isolation under-voltage protection short circuit and overload protection adjustable output voltage external inhibit > 4,000,000 hour mtbf (sf) standard microcircuit drawings available features the ls-series of dc-dc converters provide samemechanical outline, power ratings, for backward pin compatibility, to their lower radiation tolerant counterpart m3l and military series ats dc-dc converters. the common platform design allows for similarity between military and space system architectures. for higher output power applications the hm, m3h and m3g-series of dc-dc converters are recommended. applications the ls-series of dc-dc converters are, high reliabilitydevices designed for hostile radiation hardened environments. the ls-series provide up to 30 watts output power, small size, low weight, integrated emi filtering and a high tolerance to environmental stresses such as radiation, temperature extremes, mechanical shock, and vibration. extensive documentation including, thermal analysis, stress analysis and reliability predictions are available. the ls-series of converters incorporate a fixed frequency single forward topology with magnetic feedback and an internal emi filter. these converters are capable of meeting the conducted emissions requirements of mil-std-461c without any additional components. all models include an external inhibit port and have an adjustable output voltage. they are enclosed in a hermetic 1.5" x 2.3" x 0.425" steel package and weigh less than 80 grams. the package utilizes rugged ceramic feed-through copper core pins and is sealed using parallel seam welding. variations in electrical specifications and screening to meet custom requirements can be accommodated. geo synchronous satellite low earth orbit deep space probe communication and display systems payload and experiment lvps ls-series 28v input, single/dual output hybrid - high reliabilityradiation hardened dc-dc converter manufactured in a facility fully qualified 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. ls pd-96964e downloaded from: http:///
2 www.irf.com ls-series(28v input, single/dual output) the ls-series converters utilize a single-endedforward 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 voltage in the event of an internal control loop failure. circuit description an internal emi filter allows the converter to meetthe conducted emissions requirements of mil-std- 461c on the input power leads. an external inhibit port is provided to controlconverter operation. the converters operation is inhibited 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 11v with respect to the input return (pin 2). output current is limited under any load faultcondition to approximately 125% of rated. an overload condition causes the converter output voltage to drop 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 temperature coefficient to reduce the possibility of thermal runaway. the ls-series was developed using a provenconservative design methodology derived from other space level designs that includes selection of established reliability components and fully de- rating to the requirements of mil-std-975

a magnetic feedback circuit is utilized instead of opto -couplers to minimize temperature,aging and radiation sensitivity. pspice was used extensively to predict and optimize circuit performance for both beginning and end-of-life. thorough design analyses include stress, thermal, and reliability (mtbf). the output voltage of all models can be adjustedusing a single external resistor. design methodology downloaded from: http:///
www.irf.com 3 ls-series(28v input, single/dual output) electrical performance characteristics for notes to electrical performance characteristics, refer to page 5 1. input voltage rating is bol. input voltage range reduced to 20 to 40vdc for eol. 2. meets de-rating per mil-std-975 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 18 28 40 v output voltage ( vout ) ls2801r5s ls2802r5s ls2803r3s ls2805s ls2812s ls2815s ls2805d ls2812d ls2815d ls2801r5s ls2802r5s ls2803r3s ls2805s ls2812s ls2815s ls2805d ls2812d ls2815d 1 1 1 1 1 1 1 1 1 2,3 2,3 2,3 2,3 2,3 2,3 2,3 2,3 2,3 i out = 100% rated load note 4 i out = 100% rated load notes 4, 14 1.47 2.47 3.27 4.95 11.88 14.85 4.95 11.88 14.85 1.43 2.43 3.23 4.90 11.76 14.70 4.90 11.76 14.70 1.50 2.50 3.30 5.00 12.00 15.00 5.00 12.00 15.00 1.53 2.53 3.33 5.05 12.12 15.15 5.05 12.12 15.15 1.57 2.57 3.37 5.10 12.24 15.30 5.10 12.24 15.30 v v output power ( p out ) ls2801r5s ls2802r5s ls2803r3s all others 1,2,3 v in = 18, 28, 40 volts, note 2 0 0 0 0 12 20 25 30 w output current ( i out ) ls2801r5s ls2802r5s ls2803r3s ls2805s ls2812s ls2815s ls2805d ls2812d ls2815d 1,2,3 v in = 18, 28, 40 volts, note 2 either output, note 3 either output, note 3 either output, note 3 0 0 0 0 0 0 0 0 0 8.0 8.0 7.57 6.0 2.5 2.0 4.8 2.3 1.6 a line regulation ( vr line ) 1,2,3 v in = 18, 28, 40 volts i out = 0, 50%, 100% rated, note 4 -0.5 0.5 % load regulation ( vr load ) ls2801r5s ls2802r5s all others 1,2,3 v in = 18, 28, 40 volts i out = 0, 50%, 100% rated, note 4 -2.0 -1.2 -1.0 2.0 1.2 1.0 % cross regulation ( vr cross ) ls2805d ls2812d ls2815d 1,2,3 v in = 18, 28, 40 volts duals only, note 5 -5.0 -3.0 -3.0 5.0 3.0 3.0 % input voltage range -0.5vdc to +60vdc in p ut volta g e ran g e 1 +18vdc to +40vdc output power internally limited output power 0 to max. rated lead temperature +300c for 10 seconds operating case temperature -55c to +85c operating case temperature -55c to +125c (note 13) o p eratin g case tem p erature 2 -55c to +70c storage temperature -55c to +135c recommended operating conditions absolute maximum ratings downloaded from: http:///
4 www.irf.com ls-series(28v input, single/dual output) electrical performance characteristics ( continued ) for notes to electrical performance characteristics, refer to page 5 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 current, no load ( i in ) ls2801r5s ls2802r5s ls2803r3s ls2805s ls2812s ls2815s ls2805d ls2812d ls2815d 1,2,3 i out = 0, pin 4 open 60 60 60 70 70 70 70 100 100 ma input current inhibited 1,2,3 pin 4 shorted to pin 2 8.0 ma output ripple, ( v rip ) ls2801r5s ls2802r5s ls2803r3s ls2805s ls2812s ls2815s ls2805d ls2812d ls2815d 1,2,3 v in = 18, 28, 40 volts i out = 100% rated load notes 4, 6 35 35 35 50 70 80 80 80 80 mv p-p switching frequency ( f s ) 1,2,3 425 500 575 khz efficiency ( e ff ) ls2801r5s ls2802r5s ls2803r3s ls2805s ls2812s ls2815s ls2805d ls2812d ls2815d 1,2,3 i out = 100% rated load note 4 61 68 72 78 78 78 79 79 79 64 72 76 82 82 82 83 83 83 % enable input ( inhibit function ) open circuit voltage drive current ( sink ) voltage range note 1 9.5 -0.5 12 5.0 50 v ma v current limit point expressed as a percentage of full rated load current 1,2,3 v out = 90% of nominal, note 4 105 145 % power dissipation, load fault (p d ) 1,2,3 short circuit, overload, note 8 14 w output response to step load changes (v tld ) 4,5,6 half load to/from full load, notes 4,9 -300 300 mv pk recovery time, step load changes (t tld ) 4,5,6 half load to/from full load, note 4,9,10 200 s output response to step line changes (v tln ) 18v to/from 40v i out = 100% rated load, notes 1,4,11 -300 300 mv pk recovery time, step line changes (t tln ) 18v to/from 40v i out = 100% rated load, notes 1,4,10,11 200 s downloaded from: http:///
www.irf.com 5 ls-series(28v input, single/dual output) electrical performance characteristics ( continued ) 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 outputs. 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 on page 6. 7. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. for a capacitive load in excess of the maximum limit, consult the factory. 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 s. 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 s. 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 4) to the point where v out = 90% of nominal. 13. for operation at temperatures between +85c and 125c, de-rate the maximum output power linearly from 100% to 75%. 14. end of life (eol) is % 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 turn-on overshoot (v os ) ls2801r5s ls2802r5s ls2803r3s ls2805s ls2812s ls2815s ls2805d ls2812d ls2815d turn-on delay (t dly ) 4,5,6 10% load, full load notes 4,12 0 150 250 330 500 1000 1000 500 1000 1000 10 mv ms capacitive load (cl) ls2801r5s ls2802r5s ls2803r3s ls2805s ls2812s ls2815s ls2805d ls2812d ls2815d i out = 100% rated load no effect on dc performance notes 1, 4, 7 each output on duals 2500 2500 2200 1000 180 120 500 90 60 f line rejection 1 i out = 100% rated load dc to 50khz, notes 1, 4 35 50 db isolation 1 input to output or any pin to case except pin 3, test @ 500vdc 100 m ? device weight 80 g mtbf mil-hdbk-217f2, sf, 35 c 4.0 x 10 6 hr notes for electrical performance characteristics table downloaded from: http:///
6 www.irf.com ls-series(28v input, single/dual output) circuit for measuring output ripple voltage + vout return dut r l for i rated 0.1 f 50 ? coax 50 ? oscilliscope or equivalent with 10 mhz bandwidth, multiply readings by 2. 1 f 50 ? termination international rectifier currently does not have a dla land and maritime certified radiation hardnessassurance program. radiation performance characteristics test conditions min typ unit mil-prf-883, method 1019.5 total ionizing dose (gamma) operating bias applied during exposure, half rated load, v in = 28v 100 krads(si) heavy ions (let) single event effects operating bias applied during exposure, seu, sel, segr, seb full rated load, v in = 18v, 28v & 40v 82 mev cm 2 /mg test lab: cyclotron institute, texas a & m university downloaded from: http:///
www.irf.com 7 ls-series(28v input, single/dual output) ls series output voltage adjustment output of ls series can be adjusted to be greater or less than the nominal output voltage with an externalresistor. however, the ranges of the output voltages are limited depending on the model as specified in table 1 and 2. an approximate value of the resistor can be determined using the following formula. for single output model: radj = a - (b x vout) (c x vout) - d for dual output model: radj = a - (b x 2vout) (c x 2vout) - d where: radj is the value of the external resistor in kilo-ohms, rdown or rup in figure 1 or 2.power rating of the resistor shall be 0.125w. metal film resistor with temperature coefficient of
50 ppm and tolerance of 1% is recommended. however, the final selection is dependent on specific design requirements.vout is the desired output voltage in volts. a, b, c, and d are unique constants depending on the model as shown in table 1 for single output models and table 2 for dual output models. table 1: single output voltage ranges and constants model output voltage range (v) (1) abcd 1.500 to 1.600 69.65 32.39 8.75 13.13 1.400 to 1.500 56.85 40.47 7.14 10.72 2.500 to 2.750 48.42 13.04 3.52 8.81 2.250 to 2.500 39.52 21.19 2.88 7.19 3.300 to 3.630 43.48 9.25 2.50 8.25 2.970 to 3.300 35.48 16.18 2.04 6.73 5.000 to 5.500 119.48 20.00 2.27 11.36 4.500 to 5.000 97.52 29.31 1.85 9.27 12.000 to 13.200 295.22 19.98 2.27 27.24 10.800 to 12.000 241.01 53.31 1.85 22.24 15.000 to 16.500 370.61 19.98 2.27 34.05 13.500 to 15.000 302.55 63.61 1.85 27.80 ls2805sls2812s ls2815s ls2801r5s ls2802r5s ls2803r3s downloaded from: http:///
8 www.irf.com ls-series(28v input, single/dual output) table 2: dual output voltage ranges and constants note:(1). also the minimum and maximum adjustment limits of the output voltage. placement of radj an external resistor must be added in order to trim the output voltage of an ls converter. the placementof an radj resistor (rdown or rup) must be as shown in figure 1 for single output models and as per figure 2 for dual output models. please note that the connections are made to the specific pins. rup is placed across out return and out adj pins for output voltage greater than nominal output. similar connections apply for the dual output models. model volta g e ran g e of each output (vout) (1) abcd 5.000 to 5.500 196.91 17.12 1.71 17.12 4.500 to 5.000 160.74 31.11 1.40 13.97 12.000 to 13.200 475.43 17.05 1.71 40.92 10.800 to 12.000 388.10 58.04 1.39 33.41 15.000 to 16.500 594.31 17.03 1.70 51.09 13.500 to 15.000 485.10 69.47 1.39 41.70 ls2805dls2812d ls2815d downloaded from: http:///
www.irf.com 9 ls-series(28v input, single/dual output) figure 1: radj placement for single output model
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10 www.irf.com ls-series(28v input, single/dual output) figure 2: radj placement for dual output model
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www.irf.com 11 ls-series(28v input, single/dual output) ls2801r5s typical efficiency at 25c 0 10 20 30 40 50 60 70 0 102030405060708090100 % of rated load efficiency, % 18v 28v 40v ls2802r5s typical efficiency at 25c 0 10 20 30 40 50 60 70 80 90 100 0 102030405060708090100 % of rated load efficiency, % 18v 28v 40v downloaded from: http:///
12 www.irf.com ls-series(28v input, single/dual output) ls2805s typical efficiency at 25c 0 10 20 30 40 50 60 70 80 90 100 0 102030405060708090100 % of rated load efficiency, % 18v 28v 40v ls2803r3s typical efficiency at 25c 0 10 20 30 40 50 60 70 80 90 0 102030405060708090100 % of rated load efficiency, % 18v 28v 40v downloaded from: http:///
www.irf.com 13 ls-series(28v input, single/dual output) ls2815d typical efficiency at 25c 0 20 40 60 80 100 0 102030405060708090100 % of rated load efficiency, % 18v 28v 40v ls2815s typical efficiency at 25c 0 10 20 30 40 50 60 70 80 90 0 102030405060708090100 % of rated load efficiency, % 18v 28v 40v downloaded from: http:///
14 www.irf.com ls-series(28v input, single/dual output) block diagram - single output block diagram - dual output
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www.irf.com 15 ls-series(28v input, single/dual output) mechanical outline pin designation (single/dual) pin # single dual 1 + input + input 2 input return input return 3 case ground case ground 4 inhibit inhibit 5 output adjust output adjust 6 output return - output 7 + output output return 8 nc + output standard microcircuit drawing equivalence table standard microcircuit ir standard drawing number part number 5962-05238 ls2801r5s 5962-05239 ls2803r3s 5962-05240 ls2805s 5962-05241 ls2812d 5962-05242 ls2815d 5962-06241 ls2812s 5962-06242 ls2815s 5962-10224 ls2805d pin ? 0.040 ? 0.128 4 plcs 2.300 1.55 0.375 0.85 0.35 1.50 1.75 2.000 2.80 ref 0.250 0.02 0.425 max 0.050 0.47 14 23 0.40 2 eq spaces @ 0.20 5 8 7 6 0.27 1.00 ref 0.40 0.40 0.20 tolerance: .xx = 0.01 .xxx = 0.005 0.220 0.25 typ. downloaded from: http:///
16 www.irf.com ls-series(28v input, single/dual output) part numbering 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, -5 5c, +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 world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 252-7105 ir san jose: 2520 junction avenue, san jose, california 95134, tel: (408) 434-5000 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 10/2012 28 05 s /xx model input voltage nominal 28 = 28v output s = single d = dual output voltage 01r5 = 1.5v, 02r5 = 2.5v, 03r3 = 3.3v, 05 = 5v, 12 = 12v, 15 = 15v ls screening level (please refer to screening table) no suffix, ck, em, x lead finish for ck only c = gold plated a = solder dipped blank for no suffix and em lead finish for no suffix = solder dipped lead finish for em is gold plated or solder dipped depending on availability notes: best commercial practice. ck is a dla land and maritime (formerly dscc) part marking used to de signate a class k compliant hybrid. the ck marking does not indicate the hybrid is radiation certified. no suffix is a radiation rated device but not available as a dla land and martime qualified smd per mil-prf-38534. international rectifier currently does not have a dla land and marit ime certified radiation hardness assurance program. downloaded from: http:///

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