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www.irf.com 1 high reliability, radiation tolerant, low power, dc-dc converter d28xxd-series description total dose > 50k rad(si) see > 40mev . cm 2 /mg low weight < 55 grams 18v to 50v dc input range up to 10w output power independently regulated outputs: 5v, 12v and 15v -55c to +125c operating temperature range 100m ? @ 100vdc isolation input under-voltage protection meets conducted emission requirements of most major power buses: 100hz - 100khz: 80db arms short circuit and overload protection meets the derating requirments of eee-inst-002 and mil-std-1547b synchronization input / output on/off control via converters?s inhibit pin and individual output?s inhibit pin features 28v input, regulated dual outpu ts the d-series converters have two outputs, each is independently regulated. two versions exist; one version providing two positive outputs and one version providing one negative and one positive output. the d- series converters incorporate a fixed frequency flyback power converter and internal emi filter that meets the requirements for most major satellite power buses. the converters can be remotely turned on and off via an inhibit pin. additional inhibit pins are also included to control the outputs individually. this feature facilitates turn-on outputs sequencing if desired. each converter is encased in a cold rolled steel hermetic package. the package measures 1.80"l x 1.40"w x 0.42"h and weighs less than 55 grams. the package utilizes rugged ceramic feed-through copper pins and is hermetically sealed using parallel seam welding. two package options are available. please refer to page 9 for i/o configurations. the d-series of dc-dc converters are low power radiation tolerant, high reliability devices designed for hostile radiation environments such as those encountered by geostationary earth orbit satellites, deep space probes and communication systems. features include small size, high efficiency, low weight, and a good tolerance to total ionizing dose, single event effects, and environmental stresses such as temperature extremes, mechanical shock, and vibration. all components are fully derated to meet the requirements of eee-inst-002 and mil-std-1547b. extensive documentation including worst case analysis, radiation susceptibility, thermal analysis, stress analysis, and reliability analysis are available. environmental screening includes temperature cycling, constant acceleration, fine and gross leak, and burn-in as specified by mil-prf-38534 for class h hybrids. applications launch vehicles communication systems geostationary or low earth orbit satellites high cs damping 100khz - 10mhz: log-linear decrease 10mhz - 50mhz: 40db arms non-flight versions of the d-series converters are available for system development purposes. variations in electrical specifications and screening to meet custom requirements can be accommodated. pd-97819
2 www.irf.com (28v input, regulated dual outputs) d28xxd-series circuit description design methodology an under-voltage protection circuit prohibits the converter from operating when the line voltage is too low for safe operation. the converter will not start until the line voltage rises to approximately 16v. an inhibit pin is provided to control converter operation. this inhibit pin is intended for operation with an open collector transistor drive or a relay closure to the input return. the pin may be left open for normal operation and has a nominal open circuit voltage of 4v. also provided are the individual output on/off control pins (pin 10-output 1 inhibit and pin 9-output 2 inhibit). the d-series is developed using a proven conservative design methodology, which includes selecting radiation tolerant and established reliability components and fully derating to the requirements of eee-inst-002 and mil-std-1547b. heavy derating of the radiation-hardened power mosfet virtually eliminates the possibility of segr and seb. synchronization input pin is included allowing multiple converters to operate at a common switching frequency. converters can be synchronized to a common frequency with an external clock. this may be used to eliminate beat frequency noise or to avoid generating noise at certain frequencies for noise sensitive systems. the d-series dc-dc converters utilize two-stage regulation with a flyback topology with a switching frequency of 250khz for primary regulation and linear post regulation in the secondary for each of the outputs. output power is limited under any load fault condition to approximately 110% of rated output. an overload condition causes the converter output to behave like a constant 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. there are no latching elements to eliminate the possibility of falsely triggering the protection circuits during single event radiation exposure.
www.irf.com 3 (28v input, regulated dual outputs) d28xxd-series electrical performance characteristics for notes to electrical performance characteristic table, refer to page 5 specifications input voltage range -0.5vdc to +60vdc input voltage range (note 13) 18vdc to 50vdc output power internally limited output power 0 to max. rated lead temperature +300c for 10sec operating temperature -55c to +125c operating case temperature (note 12) -55c to +125c operating temperature, -55c to +73c storage temperature -55c to +135c derated (note 13) recommended operating conditions absolute maximum ratings 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 (v in ) 18 28 50 v output voltage (v out ) d2805d d2812d d2815d d2805d d2812d d2815d 1 1 1 2.3 2,3 2,3 i out = 100% rated load note 4 i out = 100% rated load note 4, 14 4.95 11.88 14.85 4.85 11.64 14.70 5.00 12.00 15.00 5.05 12.12 15.15 5.15 12.36 15.15 v v output power (p out ) d2805d d2812d d2815d 1,2,3 v in = 18, 28, 50v, note 2 either output 0 0 0 5.0 5.0 5.0 w output current (i out ) d2805d d2812d d2815d 1,2,3 v in = 18, 28, 50v, note 2 either output 0 0 0 1.00 0.42 0.33 a line regulation (vr line ) 1,2,3 v in = 18, 28, 50v i out = 0%, 50%, 100% rated -0.05 0.05 % load regulation (vr load ) 1,2,3 i out = 0%, 50%, 100% rated v in = 18, 28, 50v -1.0 1.0 % cross regulation (vr cross ) d2805d d2812d d2815d 1,2,3 v in = 18, 28, 50v, note 1 5.0 5.0 5.0 mv input current (i in ) d2805d d2812d d2815d 1,2,3 i out = 0, pin 6 open pin 6 connected to pin 2 35 35 35 10 ma switching frequency (f s ) 1,2,3 sync. input (pin 4) open 225 250 275 khz
4 www.irf.com (28v input, regulated dual outputs) d28xxd-series electrical performance characteristics (continued) for notes to electrical performance characteristic table, 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 synchronization input frequency range pulse high level pulse low level pulse transition time pulse duty cycle 1,2,3 external clock on sync in (pin 4), note 1 450 2.5 -0.5 40 20 550 5.0 0.5 80 khz v v v/ s % output ripple (v rip ) d2805d d2812d d2815d 1,2,3 v in = 18, 28, 50v i out = 100% rated load note 3 20 20 20 mv p-p output ripple @ switch frequency d2805d d2812d d2815d 1,2,3 v in = 18, 28, 50v i out = 100% rated load note 1 0.5 0.5 0.5 1.0 1.0 1.0 mv rms efficiency (e ff ) d2805d d2812d d2815d 1,2,3 i out = 100% rated load 55 61 62 58 64 65 % inhibit input open circuit voltage drive current (sink) voltage range note 1 4.0 600 50 v a v current limit point d2805d d2812d d2815d 1,2,3 v out = 90% of nominal note 10 105 105 105 145 145 145 % power dissipation load fault (p d ) 1,2,3 short circuit, overload, note 5 8.0 w output response to step load changes (v tld ) d2805d d2812d d2815d 4,5,6 half load to/ from full load, note 6 -15 -15 -15 15 15 15 mv pk recovery time, step load changes (t tld ) d2805d d2812d d2815d 4,5,6 half load to/from full load, notes 6, 7 500 500 500 s recovery time, step line changes (t tln ) 4,5,6 18v to/from 50v i out = 100% rated load, notes 1, 7, 8 100 s
www.irf.com 5 (28v input, regulated dual outputs) d28xxd-series electrical performance characteristics (continued) notes: specification and electrical performance characteristics 1. parameter is tested as part of desi g n characterization or after desi g n chan g es. thereafter, parameter shall be guaranteed to the limits specified. 2. parameter verified during line and load regulation tests. 3. guaranteed for a d.c. to 20 mhz bandwidth. tested using a 20 khz to 10 mhz bandwidth. 4. 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 during turn-on. 5. overload power dissipation is defined as the device power dissipation with the load set such that v out = 90% of nominal. 6. load step transition time > 100 s 7. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of its steady state value. 8. line step transition time > 100 s. 9. 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 6) to the point where v out = 90% of nominal. 10. current limit point expressed as a percentage of full rated load current. 11. for models with two positive outputs the envelope specification for the design is that each output voltage is limited to the range 1v to 5v. 12. although operation at temperatures between +85c and +125c is guaranteed, no parameter limits are specified. 13. meets the derating requirements of eee-inst-002 and mil-std-1547b ? except for ceramic capacitors with voltage stress below 10v will minimum be rated at 50v. 14. end of life is + 3% 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 capacitive load (c l ) d2805d d2812d d2815d 1 i out = 100% rated load no effect on dc performance notes 1, 4 each output 220 33 33 f turn-on response overshoot (v os ) d2805d d2812d d2815d turn-on delay (t dly ) 4,5,6 10% load, full load note 9 25 25 25 10 mv ms enable input (inhibit) open circuit voltage drive current (sink) voltage range 1,2,3 note 1 0 10 100 0.4 v a v emc conducted susceptibility (line rejection) 1 i out = 100% rated load primary power sine wave injection of 2vp-p, 100hz to 50mhz, note 1 80 90 db electromagnetic interference (emi), conducted emission (ce) 1 i out = 100% rated load, note 1 limits per fig. 1 isolation 1 input to output or any pin to case except pin 3, test @ 100 vdc 100 m ? device weight 55 g mtbf mil-hdbk-217f2, sf, 35 c 100.000 hours
6 www.irf.com (28v input, regulated dual outputs) d28xxd-series device screening international rectifier currently does not have a dla certified radiation hardness assurance program. radiation performance characteristics * test performed at tamu test / inspection method /em suffix flight (no suffix) element evaluation mil-std-38534 class k equivalent with sem x nondestructive bond pull mil-std-883, method 2023 x internal visual mil-std-883, method 2017 x temperature cycling mil-std-883, method 1010 condition c constant acceleration mil-std-883, method 2001 (3kg) a, y1 axis only electrical in accordance with device specificaton x pind mil-std-883, method 2020 a burn-in (2 x 160 hours) mil-std-883, method 1015 48 hours 320 hours final electrical (group a) in a ccordance with device specification x x seal mil-std-883, method 1014 condition a fine leak a1 gross leak c radiographic mil-std-883, method 2012 n/a external visual mil-std-883, method 2009 x x test conditions min unit mil-std-883, method 1019.5 total ionizing dose (gamma) operating bias applied during exposure, 50 krads (si) half rated load, v in = 28v single event effects heavy ions (let) seu, sel, segr, seb operating bias applied during exposure, 40 mev ? cm 2 / m g full rated load, v in = 18, 28, 50v
www.irf.com 7 (28v input, regulated dual outputs) d28xxd-series fig. 1 - emi conducted emission performance limit fig. 2 - a typical input emi conducted emission performance
8 www.irf.com (28v input, regulated dual outputs) d28xxd-series mechanical outline - option a (straight pins) all dimensions are in inch. .xx: 0.01 .xxx: 0.005 mechanical outline - option b (down pins) 1.800 1.550 1.30 1.90 1.650 1.400 ? 0.140 1.70 0.15 0.420 max. 0.050 0.400 1.000 ref. pin ? 0.040 0.220 0.41 0.200 typ. non-cum all dimensions are in inch. .xx: 0.01 .xxx: 0.005

www.irf.com 9 (28v input, regulated dual outputs) d28xxd-series block diagram pin designation note: pins 9 and 10 are internally connected pin # name 1 input 2 input return 3 case 4 sync in 5 sync out 6 inhibit 7 output 2 8 output 2 return 9 output 2 inhibit 10 output 1 inhibit 11 output 1 return 12 output 1

1 6 4 2 12 3 7 8 11
10 5
9
10 www.irf.com (28v input, regulated dual outputs) d28xxd-series part numbering 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. 02/2014 d 28 05 /em model d = two outputs, 5w max each, input voltage 28 = 28v quality level em = engineering model h = class h per mil-prf-38534 output configuration d = one positive, one neagtive output voltage 05 = 5v 12 = 12v 15 = 15v d i/o pin option a = straight pins b = down pins a a lead finish a = solder dipped c = gold plated blank = for em, lead finish as available radiation-tolerant design

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