www.irf.com 1 high reliability, high efficiency radiation hardened dc-dc converter gh-series description total ionizing dose (tid) > 100 krad(si) see hardened to let level > 82 mev . cm 2 /mg internal emi filter low weight, < 110 grams magnetically coupled feedback 18v to 40v dc input range up to 50w output power single output models include 1v, 1.5v, 1.8v, 2.5v, 3.3v and 5v high efficiency - to 87% -55c to +85c operating temperature range 100m ? @ 100vdc isolation under-voltage lockout short circuit and overload protection output voltage adjust synchronization output and input remote sense external inhibit features 28v input, single output applications the gh series is a family of low voltage single output dc-dc converters. they are specifically designed in response to the need for low voltage at moderate current levels with the high efficiency and tight regulation dictated by modern digital processing applications. the converters are radiation hardened, high reliability converters designed for extended operation in hostile environments. their small size and low weight make them ideal for applications such as geostationary earth orbit satellites and deep space probes. they exhibit a high tolerance to total ionizing dose, single event effects and environmental stresses such as temperature extremes, mechanical shock, and vibration. all components are fully de-rated to meet the requirements of mil-std-975, mil-std-1547 except for the cdr type of capacitors, a capacitor with 50v rating is used for in- circuit voltage stress of less than10v. thorough analyses and documentation including beginning-of-life (bol) and end-of-life (eol) electrical worst case (wca) operation, component stress and de-rating, radiation susceptibility (tree), thermal stress, failure mode and effects (fmea), and reliability (mtbf) are available for customer review. the design incorporates a fixed frequency topology with magnetic feedback. synchronous rectification is deployed to maximize efficiency performance. the converters include an internal emi filter that is capable of meeting the conducted emission requirements of most major satellite power busses. incorporation of many functional features including on/off command, remote sensing, and under-voltage lockout make the design suitable for today?s space design applications. gh the converter is enclosed in a hermetically sealed package with the overall dimensions of 3.5"l x 2.50?w x 0.475"h including the i/o pins and mounting tabs. the package base material is silicon carbide- aluminum (aisic). the package ring frame is alloy 48. the package utilizes rugged ceramic feed-through copper core i/o pins and is sealed using parallel seam welding. the total mass of a converter is less than 110 grams. geostationary earth orbit satellites (geo) deep space satellites / probes strategic weapons and communication system 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. non-flight versions of the gh-series converters are available for system development purposes. variations in electrical specifications and screening to meet custom requirements can be accommodated. pd-97440c http://
2 www.irf.com gh-series (28v input, single output) 1 meets derating per mil-std-975 electrical performance characteristics for notes to electrical performance characteristics, refer to page 4 specifications input voltage range -0.5vdc to +50vdc input voltage range +18vdc to +40vdc output power internally limited output power 0 to max. rated lead temperature +300c for 10 seconds operating temperature -55c to +85c operating temperature -55c to +125c o p eratin g tem p erature 1 -55c to +80c storage temperature -55c to +135c 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 18 28 40 v output voltage (vout) GH2801S gh2801r5s gh2801r8s gh2802r5s gh2803r3s gh2805s GH2801S gh2801r5s gh2801r8s gh2802r5s gh2803r3s gh2805s 1 1 1 1 1 1 2,3 2,3 2,3 2,3 2,3 2,3 i out = 100% rated load note 3 0.98 1.48 1.77 2.47 3.28 4.98 0.96 1.45 1.75 2.45 3.24 4.93 1.00 1.50 1.80 2.50 3.30 5.00 note 3 1.02 1.52 1.83 2.53 3.32 5.02 1.04 1.55 1.85 2.55 3.36 5.07 v output power (p out ) GH2801S gh2801r5s gh2801r8s gh2802r5s gh2803r3s gh2805s 1,2,3 v in = 18, 28, 40 volts, note 2 0 0 0 0 0 0 20 30 36 50 50 50 w output current (i out ) GH2801S gh2801r5s gh2801r8s gh2802r5s gh2803r3s gh2805s 1,2,3 v in = 18, 28, 40 volts, note 2 0 0 0 0 0 0 20 20 20 20 15.15 10 a line regulation (vr line ) 1,2,3 v in = 18, 28, 40 volts i out = 0, 50%, 100% rated -10 10 mv load regulation (vr load ) 1,2,3 i out = 0, 50%, 100% rated v in = 18, 28, 40 volts -0.5 0.5 % input current (i in ) 1,2,3 i out = 0, pin 3 open 130 200 ma pin 3 shorted to pin 2 2.0 5.0 http://
www.irf.com 3 gh-series (28v input, single output) electrical performance characteristics ( continued ) for notes to electrical performance characteristics, 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 switching frequency (f s ) 1,2,3 sync. input (pin 4) open 450 500 550 khz synchronization input frequency range pulse high level pulse low level pulse transition time pulse duty cycle ext. clock on sync. input (pin 4) note 1 450 4.0 -0.5 80 20 600 10.0 0.5 80 khz v v v/ s % output ripple (v rip ) GH2801S gh2801r5s gh2801r8s gh2802r5s gh2803r3s gh2805s 1,2,3 i out = 100% rated load note 4 5 5 5 10 10 10 15 15 15 25 25 30 mv p-p efficiency (e ff ) GH2801S gh2801r5s gh2801r8s gh2802r5s gh2803r3s gh2805s 1 i out = 100% rated load 70 72 75 81 83 85 73 75 78 84 85 87 % 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 load current 1,2,3 v out = 90% of nominal 125 135 % power dissipation, load fault (p d ) 1,2,3 short circuit, overload, note 6 17 25 w output response to step load changes (v tld ) GH2801S gh2801r5s gh2801r8s gh2802r5s gh2803r3s gh2805s 4,5,6 half load to/from full load, note 7 -300 -300 -300 -300 -300 -300 300 300 300 300 300 300 mv pk recovery time, step load changes (t tld ) GH2801S gh2801r5s gh2801r8s gh2802r5s gh2803r3s gh2805s 4,5,6 half load to/from full load, notes 7, 8 250 250 250 250 250 250 s output response to step line changes (v tln ) 4,5,6 24v to/from 32v i out = 100% rated load, notes 1, 9 -50 50 mv pk recovery time, step line changes (t tln ) 4,5,6 24v to/from 32v i out = 100% rated load, notes 1, 8, 9 200 s turn-on response overshoot (v osh ) turn-on delay (t dly ) 4,5,6 no load, full load note 10 0 250 5.0 mv ms http://
4 www.irf.com gh-series (28v input, single output) electrical performance characteristics ( continued ) radiation performance characteristics notes for the electrical performance characteristics table 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. these are beginning-of-life (bol) limits. end-of-life (eol) limits are -3% and +3% of nominal limit for min and max, respectively. 4. guaranteed for a d.c. to 20mhz bandwidth. tested using a 20khz to 10mhz bandwidth. 5. 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. 6. overload power dissipation is defined as the device power dissipation with the load set such that v out = 90% of nominal. 7. load step slew rate 0.5a/ s. 8. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of its steady state value. 9. line step slew rate 1.0v/ s. 10. 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 3) to the point where v out = 90% of nominal. 11. mil-hdb k mosfe t failure rates re p laced b y em p irical failure rate data su pp lied b y international rectifier. 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 ) 1 i out = 100% rated load no effect on dc performance notes 1, 5 5000 f line rejection 1 i out = 100% rated load dc to 50khz, note 1 40 60 db electroma g netic interference (emi), conducted emission (c e ) 1 i out = 100% rated load, note 1 per fig. 3 isolation 1 input to output or any pin to case except pin 13, test @ 100vdc 100 m ? device mass 110 g mtbf mil-hdbk-217f2, sf, 35 c, note 11 5.8x10 6 hrs international rectifier currently does not have a dla land and maritime certified radiation hardness assurance program. 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 half rated load, v in = 18v, 28v & 50v 82 mev cm 2 /mg test lab: cyclotron institute, texas a & m university http://
www.irf.com 5 gh-series (28v input, single output) efficiency vs. output current at 25oc, 5v output (gh2805s) 40 45 50 55 60 65 70 75 80 85 90 0246810 output current, a efficiency, % 18v vin 28v vin 40v vin efficiency vs. temperature, 5v output (gh2805s) 50 55 60 65 70 75 80 85 90 0246810 output current, a efficiency, % -55oc 25oc 85oc fig. 1 ?typical efficiency vs output curent @ 25c, 5v output (gh2805s) fig. 2 ?typical efficiency vs temperature, 5v output (gh2805s) http://
6 www.irf.com gh-series (28v input, single output) fig. 4 block diagram - single output 1 2 3 input inhibit input return output output return 4 sync input -sense 13 sync output bias supply uvlo & inhibit emi filter peak current detection +12v oscillator pwm controller sample & hold feedback trigger case sense amplifier error amplifier +sense vfb ref & s.s. ref aout bout s.s. output adjust clk +9v sec. bias 6 11 12 5 7/8 9/10 fig. 3 ? emi ce03 specification limits and typical performance http://
www.irf.com 7 gh-series (28v input, single output) application note: table 1. equation parameters by model where: r adj is in kohms r adj is connected to -sense and v nom < v out < 1.1v nom v nom is the nominal output voltage with the adjust pin left open v out is the desired output voltage a and b are parameters defined in table 1 the gh-series converters have an output adjus t pin (pin 12), which when connected via an external resistor (r adj ) to either the ?sense (pin 11) or +sense (pin 6), allows the nominal output voltage to be adjusted. use the following equations with the parameters listed in table 1 to calculate the required resistor value (r adj ). for all models , to adjust the output voltage higher: b - v - v a = r nom out adj 2 for all models , to adjust the output voltage lower: b - a v c a = r out adj ? ? ? ? ? ? ? ? ? ? 5 . 0 ) ( 1 where: r adj is in kohms r adj is connected to +sense and d < v out < v nom v nom is the nominal output voltage with the adjust pin left open v out is the desired output voltage a, b, c and d are parameters defined in table 1 equation parameters model a b c d GH2801S 0.714 14.3 5.0 0.965 gh2801r5s 0.937 12.6 3.33 1.425 gh2801r8s 1.047 11.5 2.78 1.689 gh2802r5s 1.25 10 2.0 2.292 gh2803r3s 1.425 8.34 1.52 2.937 gh2805s 1.667 6.68 1.0 4.233 http://
8 www.irf.com gh-series (28v input, single output) standard microcircuit drawing equivalence table mechanical diagram pin designation pin # designation pin # designation 1 input 8 output 2 input return 9 output return 3 inhibit 10 output return 4 sync input 11 - sense 5 sync output 12 output adjust 6 + sense 13 case 7 output 3.055 max. 0.500 2.00 0.45 1.10 2.500 2.30 0.200 typ. non- cum. 0.30 1.400 ref. 3.50 ref. 0.475 max. 0.080 max. 0.260 pin ?0.040 r0.0625 4 places 0.50 0.60 0.20 tolerance : .xx 0.01 .xxx 0.005 1 2 3 4 5 12 13 11 10 9 8 7 6 0.25 2.055 max. flange detail 0.40 0.25 0.14 r 0 . 0 6 2 5 standard microcircuit ir standard drawing number part number 5962-1021701kxx gh2803r3s/ckx 5962-1021901kxx gh2805s/ckx http://
www.irf.com 9 gh-series (28v input, single output) 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 part numbering 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 gh 28 05 s /xx model nominal input voltage 28 = 28v screening level (please refer to screening table) no suffix, em, ck number of outputs s = single output voltage 01 = 1v, 01r5 = 1.5v 01r8 = 1.8v, 02r5 = 2.5v 03r3 = 3.3v, 05 = 5v x lead finish for ck only c = gold plated a = solder dipped blank for no suffix and em lead finish for no suffix = gold plated lead finish for em depending on availability notes: best commercial practice. ck is a dla land and maritime ( formerl y dscc ) p art markin g used to desi g nate a class k com p liant h y brid. 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 maritime certified radiation hardness assurance program . http://
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