10/28/02 www.irf.com 1 advanced analog hybrid-high reliability dc/dc converters ahe28xxs series description 17 to 40 vdc input range (28 vdc nominal) 5 v, 12v and 15v outputs available indefinite short circuit and overload protection 17 w/in 3 power density 15 and 20 watts output power models 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 84% shutdown from external signal military screening 325,000 hour mtbf at 85c (auc) features ahe 28v input, single 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. three standard temperature grades are offered with screening options. refer to part number section. they can be provided in a standard plug-in package for pc mounting or in a flanged package for more severe en- vironments. these converters are manufactured in a facility certi- fied to mil-prf-38534. all processes used to manu- facture these converters have been qualified to enable advanced analog to deliver compliant devices. two screening grades are available to satisfy a wide range of requirements. the ch grade converters are fully compliant to mil-prf-38534 for class h. the hb grade converters are processed to full class h screen- ing but do not have class h element evaluation as re- quired by mil-prf-38534. both grades are fully tested and operate over the full military temperature range without derating of output power. variations in electri- cal, mechanical and screening can be accommodated. extensive computer simulation using complex modeling enables rapid design modification to be provided. contact advanced analog with spe- cific requirements. the ahe28xxs 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 +5v, +12v and +15v single outputs to satisfy a wide range of requirements. the circuit design incorporates a pulse width modu- lated push-pull topology operating in the feed-forward mode at a nominal switching frequency of 250khz. input to output isolation is achieved through the use of transformers in the forward and feedback circuits. pd - 94554a www..net
2 www.irf.com ahe28xxs series specifications t case = -55c to +85c, v in = +28v 5% unless otherwise specified notes to specifications 1. above +85 c case temperature, derate output power linearly to 0 and maximum input voltage linearly to 42v at 115 c case. 2. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of v out at 50% load. see typical waveforms. 3. turn-on delay time measurement is for either an application of power at the input or a signal at the shutdown pin. 4. for operation at 16vdc, derate output power by 33%. AHE2805S ahe2812s ahe2815s parameter conditions -55c tc +85c vin = 28 vdc 5%,c l = 0 unless otherwise specified min typ max min typ max min typ max units static characteristic output voltage current ripple accuracy power 1 v in =17 to 40 vdc i out =0 to full load full load, dc to 1mhz t case = 25 c, i out = 0 4.90 0.0 4.95 15 5.00 20 5.00 5.10 3000 60 5.05 11.76 0.0 11.88 20 12.00 30 12.00 12.24 1667 60 12.12 14.70 0.0 14.85 20 15.00 30 15.00 15.30 1333 60 15.15 vdc madc mvp-p vdc w regulation line load v in = 17 to 40 vdc i out = to full load 0.5 0.5 1.0 1.0 0.5 0.5 1.0 1.0 0.5 0.5 1.0 1.0 % % input voltage range 4 current ripple current inhibited no load full load 17.0 28.0 8 20 40.0 18 35 50 17.0 28.0 8 25 40.0 18 35 50 17.0 28.0 8 25 40.0 18 35 50 vdc madc madc mv p-p efficiency t case = +25 c half load to full load 80 82 79 83 80 84 % capacitive load no effect on performance 500 200 200 f load fault power dissipation 4 6 6 6 w isolation input to output @ 500vdc 100 100 100 m ? dynamic characteristic step load changes output transient 50% load 100% load no load 50% load 150 -300 200 -400 200 -400 mvpk mvpk 50% load no load +300 +400 +400 mvpk recovery 2 50% load 100% load no load 50% load 50% load no load 25 500 7 25 500 7 25 500 7 sec sec msec step line changes output transient recovery 2 input step 17 to 40vdc input step 40 to 17vdc input step 17 to 40vdc input step 40 to 17vdc +180 -600 400 400 +180 -600 400 400 +180 -600 400 400 mvpk mvpk sec sec turn-on overshoot delay 3 vin = 17 to 40vdc iout = 0 to full load 0 8 500 14 300 8 600 14 300 8 500 14 mvpk msec load fault recovery 4 vin = 17 to 40vdc 8 14 8 14 8 14 msec weight standard package flange package 55 58 55 58 55 58 grams grams input voltage 1 -0.5v to 50v power output internally limited, 17.5w typical for AHE2805S, 22.5w typical for ahe2812s and ahe2815s soldering 300c for 10 seconds temperature range 1 operating -55c to +125c case storage -65c to +135c absolute maximum ratings
www.irf.com 3 ahe28xxs series specifications t case = -55c to +105c, v in = +28v 5% unless otherwise specified 1. above +105 c case temperature, derate output power linearly to 0 at 125 c case. 2. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of v out at 50% load. see typical waveforms. 3. turn-on delay time measurement is for either an application of power at the input or a signal at the shutdown pin. 4. for operation at 16vdc, derate output power by 33%. 5. above +85 c case temperature, derate maximum input voltage linearly to 33v at +125 c case. notes to specifications AHE2805S/es ahe2812s/es ahe2815s/es parameter conditions -55c tc +105c vin = 28 vdc 5%,c l = 0 unless otherwise specified min typ max min typ max min typ max units static characteristic output voltage current ripple accuracy power 1 v in =17 to 40 vdc i out =0 to full load full load, dc to 1mhz t case = 25 c, i out = 0 4.90 0.0 4.95 15 5.00 20 5.00 5.10 3000 60 5.05 11.76 0.0 11.88 20 12.00 30 12.00 12.24 1667 60 12.12 14.70 0.0 14.85 20 15.00 30 15.00 15.30 1333 60 15.15 vdc madc mvp-p vdc w regulation line load v in = 17 to 40 vdc i out = 0 to full load 0.5 0.5 1.0 1.0 0.5 0.5 1.0 1.0 0.5 0.5 1.0 1.0 % % input voltage range 4 current ripple current inhibited no load full load 17.0 28.0 8 20 40.0 18 35 50 17.0 28.0 8 25 40.0 18 35 50 17.0 28.0 8 25 40.0 18 35 50 vdc madc madc mv p-p efficiency t case = +25 c half load to full load 78 82 79 83 80 84 % capacitive load no effect on performance 500 200 200 f load fault power dissipation 4 6 6 6 w isolation input to output @ 500vdc 100 100 100 m ? dynamic characteristic step load changes output transient 50% load 100% load no load 50% load 150 -300 200 -400 200 -400 mvpk mvpk 50% load no load +300 +400 +400 mvpk recovery 2 50% load 100% load no load 50% load 50% load no load 25 500 7 25 500 7 25 500 7 sec sec msec step line changes output transient recovery 2 input step 17 to 40vdc input step 40 to 17vdc input step 17 to 40vdc input step 40 to 17vdc +180 -600 400 400 +180 -600 400 400 +180 -600 400 400 mvpk mvpk sec sec turn ?on overshoot delay 3 v in = 17 to 40vdc i out = 0 to full load 0 8 500 14 300 8 600 14 300 8 750 14 mvpk msec load fault recovery 4 v in = 17 to 40vdc 8 14 8 14 8 14 msec weight standard package flange package 60 65 60 65 60 65 grams grams input voltage 5 -0.5v to 50v power output internally limited, 17.5w typical for AHE2805S/es, 22.5w typical for ahe2812s/es and ahe2815 s/es soldering 300c for 10 seconds temperature range 1 operating -55c to +125c case storage -65c to +135c absolute maximum ratings
4 www.irf.com ahe28xxs series specifications notes to specifications 1. above +125 c case temperature, derate output power linearly to 0 at 135 c case. 2. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of v out at 50% load. see typical waveforms. 3. turn-on delay time measurement is for either an application of power at the input or a signal at the shutdown pin. 4. for operation at 16vdc, derate output power by 33%. 5. an overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circu it protection and is the condition of maximum power dissipation. parameter conditions -55c tc +125c vin = 28 vdc 5%,c l = 0 unless otherwise specified AHE2805S/hb&ch ahe2812s/hb&ch ahe2815s/hb&ch min typ max min typ max min typ max units static characteristic output voltage current ripple accuracy power 1 v in =17 to 40 vdc i out =0 to full load full load, dc to 1mhz t case = 25 c, i out = 0 4.90 0.0 4.95 15 5.00 20 5.00 5.10 3000 60 5.05 11.76 0.0 11.88 20 12.00 30 12.00 12.24 1667 60 12.12 14.70 0.0 14.85 20 15.00 30 15.00 15.30 1333 60 15.15 vdc madc mvp-p vdc w regulation line load v in = 17 to 40 vdc t case = 25 c i out = 0 to full load 10 5 50 50 30 120 50 35 150 mv mv input voltage range 4 current ripple current inhibited no load full load 17.0 28.0 8 20 40.0 18 35 50 17.0 28.0 8 25 40.0 18 35 50 17.0 28.0 8 25 40.0 18 35 50 vdc madc madc mv p-p efficiency t case = +25 c 80 82 80 83 80 84 % capacitive load no effect on performance 500 1000 200 1000 200 1000 f load fault power dissipation 5 short circuit t c =25 c overload t c = 25 c 4.5 6 4.5 6 4.5 6 w w isolation input to output @ 500vdc 100 100 100 m ? dynamic characteristic step load changes output t c =25 c transient 50% load 100% load no load 50% load 150 -300 300 -500 200 -400 300 -500 200 -400 300 -500 mvpk mvpk 50% load no load +300 +500 +400 +500 +400 +500 mvpk recovery 2 50% load 100% load no load 50% load 50% load no load 25 100 70 200 5 25 500 70 1500 5 25 500 70 1500 5 sec sec msec step line changes output t c = 25 c transient recovery 2 input step 17 to 40vdc input step 40 to 17vdc input step 17 to 40vdc input step 40 to 17vdc +180 -600 400 400 +300 1000 800 800 +180 -600 400 400 +500 -1500 800 800 +180 -600 400 400 +500 -1500 800 800 mvpk mvpk sec sec turn ?on overshoot delay 3 v in = 17 to 40vdc i out = 0 to full load 0 8 550 10 300 8 600 10 300 8 500 10 mvpk msec load fault recovery 4 v in = 17 to 40vdc 8 10 8 10 8 10 msec weight standard package flange package 55 58 55 58 55 58 grams grams input voltage 1 -0.5v to 50v power output internally limited, 17.5w typical for AHE2805S/hb&ch, 22.5w typical for ahe281xs/hb&ch soldering 300c for 10 seconds temp range 1 operating -55c to +125c case storage -65c to +135c absolute maximum ratings
www.irf.com 5 ahe28xxs 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. ahe28xxs block diagram application information inhibit function emi filter an emi filter (afc461), available as an option, will reduce the input ripple current to levels below the limits imposed by mil-std-461b ceo. output voltage adjustment (ahe2805 only) the output voltage of the AHE2805S converter can be adjusted upward by connecting an appropriate resistor between output adjust (pin 3) and output common (pin 4) as shown in table 1 below. table 1 output adjustment resistor values 5 4 +vout retur n pulse width modulator emi filter 1 2 10 +input enable input return error amp & ref 3v adj fb drive 1 drive 2 9 s y nc resistance pin 3 to 4 ( ? ) output voltage increases (%) none 0 390k +1% 145k +2% 63k +3% 22k +4% 0 +5%
6 www.irf.com ahe28xxs series whenever multiple dc/dc converters are utilized in a single system, significant low frequency noise may be gener- ated due to slight difference in the switching frequencies of the converters (beat frequency noise). because of the low frequency 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). advanced analog offers an option, which provides synchronization of multiple ahe/atw/ato type converters, thus eliminating this type of noise. device synchronization 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 possibility 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. see part number section. typical synchronization connection ahe28xxs -slv ahe28xxs - m str afc461 or afv461 ahe28xxd -slv + 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 -out p ut
www.irf.com 7 ahe28xxs series pin designation ahe28xxs 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 ? 0.162 2 holes 123 5 4 2.11 0 0.495 * AHE2805S only. ahe2812s / 2815s have n/c on pin 3 ahe 28 05 s f / ch - mstr model input volta g e 28 = 28v output volta g e 5 = 5, 12 = 12, 15 = 15 outputs s = single d = dual screenin g ? , es, hb, ch packa g e options f = flange omit for standard sync option mstr = master slv = slave pin no. designation 1 positive input 2 enable input 3 output adjust * 4 output return 5 positive output 6 n/c 7 n/c 8 case ground 9 n/c or sync. 10 input return
8 www.irf.com ahe28xxs 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 ahe28xxs 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 48hrs @ 125 c 160hrs @ 125 c 160hrs @ 125 c final electrical (group a) mil-prf- 38534 & specifications 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 military drawing pin vendor cage code vendor similar pin 5962-8968301hxx 52467 AHE2805S/ch 5962-8968301hzx 52467 AHE2805Sf/ch 5962-8968302hxx 52467 AHE2805S/ch-slv 5962-8968302hzx 52467 AHE2805Sf/chslv 5962-8968303hxx 52467 AHE2805S/ch-mstr 5962-8968303hzx 52467 AHE2805Sf/ch-mstr standard military drawing pin vendor cage code vendor similar pin 5962-9158001hxx 52467 ahe2812s/ch 5962-9158001hzx 52467 ahe2812sf/ch 5962-9158002hxx 52467 ahe2812s/ch-slv 5962-9158002hzx 52467 ahe2812sf/ch-slv 5962-9158003hxx 52467 ahe2812s/ch-mstr 5962-9158003hzx 52467 ahe2812sf/ch-mstr standard military drawing pin vendor cage code vendor similar pin 5962-9162501hxx 52467 ahe2815s/ch 5962-9162501hzx 52467 ahe2815sf/ch 5962-9162502hxx 52467 ahe2815s/ch-slv 5962-9162502hzx 52467 ahe2815sf/ch-slv 5962-9162503hxx 52467 ahe2815s/ch-mstr 5962-9162503hzx 52467 ahe2815sf/ch-mstr
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