10/25/02 www.irf.com 1 advanced analog hybrid-high reliability dc/dc converters ahe28xxd series description 17 to 40 vdc input range 28 vdc nominal input 12v and 15v outputs available indefinite short circuit and overload protection 12.9 w/in 3 power density 15 watts output power fast loop response for superior transient characteristics operating temperature range from -55c to +125c available popular industry standard pin-out resistance seam welded case for superior long term hermeticity efficiencies up to 82% shutdown from external signal military screening 314,000 hour mtbf at 85c (auc) features ahe 28v input, dual output the advanced feedback design provides fast loop re- sponse for superior line and load transient character- istics and offers greater reliability and radiation toler- ance than devices incorporating optical feedback cir- cuits. the ahe series of dc/dc converters feature high power density and an extended temperature range for use in military and industrial applications. designed to mil-std-704d input requirements, these devices have nominal 28vdc inputs with +12v and +15v dual out- puts to satisfy a wide range of requirements. the circuit design incorporates a pulse width modulated push- pull topology operating in the feed-forward mode at a nominal switching frequency of 250khz. input to out- put isolation is achieved through the use of transform- ers in the forward and feedback circuits. manufactured in a facility fully qualified to mil-prf- 38534, these converters are available in four screen- ing grades to satisfy a wide range of requirements. the ch grade is fully compliant to the requirements of mil- prf-38534 for class h. the hb grade is processed and screened to the class h requirement, but may not be necessarily meet all of the other mil-prf-38534 requirements, e.g., element evaluation and periodic inspection (p.i.) are not required. both grades are tested to meet the complete group ?a? test specification over the full military temperature range without output power deration. two grades with more limited screening are also available for use in less demanding applications. variations in electrical, mechanical and screening can be accommodated. contact advanced analog for spe- cial requirements. pd - 94555
2 www.irf.com ahe28xxd series specifications for notes to specifications, refer to page 3 table i. electrical performance characteristics ahe2812d test symbol conditions -55c tc +125c vin = 28 vdc 5%, c l = 0 unless otherwise specified group a subgroups device types limits unit min max output voltage v out i out = 0 1 all 11.88 12.12 v 2,3 11.76 12.24 output current 9, 11 i out v in = 17, 28, and 40 v dc 1,2,3 all 0.0 625 ma output ripple voltage 8, 9 v rip v in = 17, 28, and 40 v dc, b.w. = dc to 2mhz 1,2,3 all 60 mvp-p output power 4, 9, 11 p out v in =17,28, and 40 v dc 1,2,3 all 15 w 1 30 line 9 regulation 10 vr line v in = 17, 28, and 40 v dc, i out = 0, 313, and 625ma 2,3 all 60 mv load regulation 9 vr load v in = 17, 28, and 40 v dc, i out = 0, 313,and 625 ma 1,2,3 all 120 mv input current i in i out = 0, inhibit (pin 2) tied to input return (pin 10) 1,2,3 all 18 ma i out = 0, inhibit (pin 2) = open 40 input ripple current 8 i rip i out = 625ma b.w. = dc to 2mhz 1,2,3 all 50 map-p efficiency e ff i out = 625ma 1 all 80 % t c = +25 c isolation iso input to output or any pin to case (except pin 8) at 500v dc tc = +25oc 1 all 100 m ? capacitive load 6, 12 c l no effect on dc performance, tc = +25oc 4 all 200 f power dissipation load fault p d overload, t c = +25 c 3 1 all 6 w short circuit, t c = +25 c 1 6 switching frequency 9 f s i out = 625ma 4,5,6 01 225 275 khz 02 225 245 03 250 275 output response to step transient load changes 7 vo tload 50% load to/from100%load 4 all -300 +300 mvpk 5,6 -450 +450 no load to/from 50% load 4 all -500 +500 5,6 -750 +750 input voltage -0.5v to 50v soldering temperature 300c for 10 seconds case temperature operating -55c to +125c storage -65c to +135c absolute maximum ratings
www.irf.com 3 ahe28xxd series notes to specifications table i. electrical performance characteristics - continued 1 recovery time is measured from the initiation of the transient to where v out has returned to within .1 percent of v out at 50 percent load. 2 turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal fr om the inhibit pin (pin 2) while power is applied to the input. 3 an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 4 total power at both outputs. for operation at 16 v dc input, derate output power by 33 percent. 5 input step transition time between 2 and 10 microseconds. 6 capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in ex cess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection cir cuitry, appearing as a short circuit during turn-on. 7 load step transition time between 2 and 10 microseconds. 8 bandwidth guaranteed by design. tested for 20 khz to 2mhz. 9 tested at each output. 10 when operating with unbalanced loads, at least 25 percent of the load must be on the positive output to maintain regulatio n. 11 parameter guaranteed by line and load regulation tests. 12 parameter shall be tested as part of design characterization and after design or process changes. thereafter parameters sh all be guaranteed to the limits specified in table i. ahe2812d test symbol conditions -55 tc +125c vin = 28 vdc 5%, c l = 0 unless otherwise specified group a subgroups device types limits unit min max recovery time step transient load changes 1, 7 tt load 50% load to/from 100% load 4 all 70 s 5,6 100 no load to 50% load 4,5,6 all 1500 50% load to no load 4,5,6 all 5 ms output response transient step line changes 5, 12 vo tline input step 17 to 40v dc 4,5,6 all 1200 mvpk input step 40 to 17v dc 4,5,6 all -1500 recovery time transient step line changes 1, 5, 12 tt line input step 17 to 40v dc 4,5,6 all 4 ms input step 40 to 17v dc 4,5,6 all 4 turn on overshoot 9 vton os i out = 0 and 625ma 4,5,6 all 600 mvpk turn on delay 2, 9 ton d i out = 0 and 625ma 4,5,6 all 10 ms load fault recovery 12 tr lf 4,5,6 all 10 ms
4 www.irf.com ahe28xxd series specifications table ii. electrical performance characteristics ahe2815d refer notes to specifications, refer to page 5 test symbol conditions -55c tc +125c vin = 28 vdc 5%, c l = 0 unless otherwise specified group a subgroups device types limits unit min max output voltage v out i out = 0 1 all 14.85 15.15 v 2,3 14.70 15.30 output current 9, 11 i out v in = 17, 28, and 40 v dc 1,2,3 all 0.0 500 ma output ripple voltage 8, 9 v rip v in = 17, 28, and 40 v dc, b.w. = dc to 2 mhz 1,2,3 all 60 mvp-p output power 4, 9, 11 p out v in =17,28, and 40 v dc 1,2,3 all 15 w 1 35 line regulation 9, 10 vr line v in = 17, 28, and 40 v dc, i out = 0, 250, and 500ma 2,3 all 75 mv load regulation 9 vr load v in = 17, 28, and 40 v dc, i out = 0, 250,and 625 ma 1,2,3 all 150 mv input current i in i out = 0, inhibit (pin 2) tied to input return (pin 10) 1,2,3 all 18 ma i out = 0, inhibit (pin 2) = open 40 input ripple current 8 i rip i out = 500ma b.w. = dc to 2mhz 1,2,3 all 50 map-p efficiency e ff i out = 500ma 1 all 80 % t c = +25 c isolation iso input to output or any pin to case (except pin 8) at 500v dc tc = +25c 1 all 100 m ? capacitive load 6, 12 c l no effect on dc performance, tc = +25c 4 all 200 f power dissipation load fault p d overload, t c = +25 c 3 1 all 6 w switching frequency 9 f s i out = 500ma 4,5,6 01 225 275 khz 02 225 245 03 250 275 output response to step transient load changes 7 vo tload 50% load to/from100%load 4 all -300 +300 mv pk 5,6 -450 +450 no load to/from 50% load 4 all -500 +500 5,6 -750 +750 input voltage -0.5v to 50v soldering temperature 300c for 10 seconds case temperature operating -55c to +125c storage -65c to +135c absolute maximum ratings
www.irf.com 5 ahe28xxd series table ii. electrical performance characteristics - continued notes to specifications 1 recovery time is measured from the initiation of the transient to where v out has returned to within .1 percent of v out at 50 percent load. 2 turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal fro m the inhibit pin (pin 2) while power is applied to the input. 3 an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short ci rcuit protection and is the condition of maximum power dissipation. 4 total power at both outputs. for operation at 16 vdc input, derate output power by 33 percent. 5 input step transition time between 2 and 10 microseconds. 6 capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in exce ss of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circ uitry, appearing as a short circuit during turn-on. 7 load step transition time between 2 and 10 microseconds. 8 bandwidth guaranteed by design. tested for 20khz to 2mhz. 9 tested at each output. 10 when operating with unbalanced loads, at least 25 percent of the load must be on the positive output to maintain regulatio n. 11 parameter guaranteed by line and load regulation tests. 12 parameter shall be tested as part of design characterization and after design or process changes. thereafter parameters sha ll be guaranteed to the limits specified in table ii. ahe2815d test symbol conditions -55c tc +125c vin = 28 vdc 5%, c l = 0 unless otherwise specified group a subgroups device types limits unit min max recovery time step transient load changes 1, 7 tt load 50% load to/from 100% load 4 all 70 s 5,6 100 no load to 50% load 4,5,6 all 1500 50% load to no load 4,5,6 all 5 ms output response transient step line changes 5, 12 vo tline input step 17 to 40v dc 4,5,6 all 1500 mv pk input step 40 to 17v dc 4,5,6 all -1500 recovery time transient step line changes 1, 5, 12 tt line input step 17 to 40v dc 4,5,6 all 4 ms input step 40 to 17v dc 4,5,6 all 4 turn on overshoot 9 vton os i out = 0 and 500ma 4,5,6 all 600 mv pk turn on delay 2, 9 ton d i out = 0 and 500ma 4,5,6 all 10 ms load fault recovery 12 tr lf 4,5,6 all 10 ms
6 www.irf.com ahe28xxd series connecting the inhibit input (pin 2) to input common (pin 10) will cause the converter to shut down. it is recommended that the inhibit pin be driven by an open collector device capable of sinking at least 400a of current. the open cir- cuit voltage of the inhibit input is 11.5 1 vdc. ahe28xxd block diagram application information inhibit function emi filter an optional emi filter (afc461) will reduce the input ripple current to levels below the limits imposed by mil-std-461 ceo3. device synchronization whenever multiple dc/dc converters are utilized in a single system, significant low frequency noise may be generated due to slight difference in the switching frequencies of the converters (beat frequency noise). because of the low fre- quency nature of this noise (typically less than 10khz), it is difficult to filter out and may interfere with proper operation of sensitive systems (communications, radar or telemetry). to take advantage of this capability, the system designer must assign one of the converters as the master. then, by definition, the remaining converters become slaves and will operate at the masters? switching frequency. the user should be aware that the synchronization sys- tem is fail-safe; that is, the slaves will continue operating should the master frequency be interrupted for any rea- son. the layout must be such that the synchronization output (pin 9) of the master device is connected to the synchronization input (pin 9) of each slave device. it is advisable to keep this run short to minimize the possibil- ity of radiating the 250khz switching frequency. the appropriate parts must be ordered to utilize this fea- ture. after selecting the converters required for the sys- tem, a ?mstr? suffix is added for the master converter part number and a ?slv? suffix is added for slave part number. advanced analog offers an option that provides syn- chronization of multiple ahe/atw converters, thus elimi- nating this type of noise. typical synchronization connection ahe28xxs ahe28xxs afc461 or afv461 ahe28xxs or other compatable + in + in + in case case case return return return return return return out p ut out p ut out p ut mstr slv slv + in return out p ut return system bus 3 4 +vout retur n pulse width modulator emi filter 1 2 10 +input enable input return fb drive 1 drive 2 9 sync error am p & reference 5 -vout re g ulator
www.irf.com 7 ahe28xxd series pin designation ( ahe2812d & ahe2815d ) ahe28xxd case outlines flanged non-flanged part numbering 2.560 1.110 0.040 d x 0.26 l pins 4 x 0.400 =1.600 2.880 max 2.110 max 0.495 max 0.050 610 9 8 7 0.800 123 5 4 2.11 0 0.495 ? 0.162 2 holes ahe 28 15 d f / ch - mstr model input voltage 28 = 28v o utput voltage 12 = 12, 15 = 15 outputs s = single, d = dual screening ? , es, hb, ch package options f = flange omit for standard sync option mstr = master slv = slave omit for standard pin no. designation 1 positive input 2 inhibit input 3 positive output 4 output common 5 nagative output 6 n/c 7 n/c 8 case ground 9 n/c or sync. 10 input common
8 www.irf.com ahe28xxd series available standard military drawing (smd) cross reference world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 322 3331 advanced analog: 2270 martin av., santa clara, california 95050, tel: (408) 727-0500 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 10/02 available screening levels and process variations for ahe28xxd series * per commercial standards requirement mil-std-883 method no suffix es suffix hb suffix ch suffix temperature range -20 to +85 c -55 c to +125 c -55 c to +125 c -55 c to +125 c element evaluation mil-prf-38534 internal visual 2017 ? yes yes yes temperature cycle 1010 cond b cond c cond c constant acceleration 2001 500g cond a cond a burn-in 1015 48hrs @ 85 c 96hrs @ 125 c 160hrs @ 125 c 160hrs @ 125 c final electrical (group a) mil-prf- 38534 25 c 25 c -55, +25, +125 c -55, +25, +125 c seal, fine & gross 1014 cond c cond a, c cond a, c cond a, c external visual 2009 ? yes yes yes standard vendor vendor military drawing cage similar pin code pin 5962-9204001hxx 52467 ahe2812d/ch 5962-9204001hzx 52467 ahe2812df/ch 5962-9204002hxx 52467 ahe2812d/ch-slv 5962-9204002hzx 52467 ahe2812df/ch-slv 5962-9204003hxx 52467 ahe2812d/ch-mstr 5962-9204003hzx 52467 ahe2812df/ch-mstr standard vendor vendor military drawing cage similar pin code pin 5962-9157501hxx 52467 ahe2815d/ch 5962-9157501hzx 52467 ahe2815df/ch 5962-9157502hxx 52467 ahe2815d/ch-slv 5962-9157502hzx 52467 ahe2815df/ch-slv 5962-9157503hxx 52467 ahe2815d/ch-mstr 5962-9157503hzx 52467 ahe2815df/ch-mstr 48hrs
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