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ahe2800s series hybrid - high reliability dc/dc co n ve r ters description the ahe2800s 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-704 input requirements, these devices have nominal 28 v dc inputs with +5v, +12v and +15v single outputs 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 250 k hz. input to output isolation is achieved through the use of transformers in the forward and feedback circuits. the advanced feedback design provides fast loop response for superior line and load transient charac- teristics and offers greater reliability and radiation tolerance than devices incorporating optical feed- back circuits. 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 environments. these converters are manufactured in a facility fully qualified to mil-prf-38534. all processes used to manufacture these converters have been qualified to enable la mbda 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 m il-prf-38534 class h. the hb grade converters are processed to full class h screening but do not have class h element evaluation as required by m il-prf-38534. both grades are fully tested and operate over the full military temperature range without derating of output power. variations in electrical, mechanical and screening can be accommodated. extensive computer simulation using complex modeling enables rapid design modification to be provided. contact l am bda ad v a nc ed analog with specific requirements. features n 17-40v dc input range (28 v dc nominal) n 5v, 12v and 15v outputs available n indefinite short circuit and overload protection n 17w/in 3 power density n 15 and 20 watts output power models n fast loop response for superior transient character- istics n operating temperature range from -55c to + 125c available n popular industry standard pin-out n resistance seam welded case for superior long term hermeticity n efficiencies up to 84% n shutdown from external signal n military screening n 325,000 hour mtbf at 85c (auc)
conditions -55c - tc - +85c, v in - 28 v dc ahe2805s ahe2812s ahe2815s parameter 5%, c=0, unless otherwise specified min typ max min typ max min typ max units static characteristics output v i n = 17 to 40 v dc voltage i out = 0 to full load 4.90 5.00 5.10 11.76 12.00 12.24 14.70 15.00 15.3 0 v dc current 0.0 3000 0.0 1667 0.0 1333 ma dc ripple full load, dc to 1mhz 20 60 30 60 30 60 mvpp accuracy t case = 25c, i out = 0 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.1 5 v dc power 1 15 20 20 w regulation line v in = 17 to 40v dc 0.5 1.0 0.5 1.0 0.5 1.0 % load i out = 0 to full load 0.5 1.0 0.5 1.0 0.5 1.0 % input voltage range 4 17.0 28.0 40.0 17.0 28.0 40.0 17.0 28.0 40.0 v dc current inhibited 8 18 8 18 8 18 ma dc no load 35 35 35 m a dc ripple current ful l load 20 50 25 50 25 50 m v p-p efficiency t case = +25c half load to full load 80 82 79 83 80 84 % capacitiv e load no effect on performance 5 0 0 2 0 0 2 0 0 f load fault power dissipation 4 66 6 w isolation input to output @ 500 v dc 100 100 100 m w dynamic characteristics step load changes output 50% load 100% load 150 200 200 mvpk transient no load 50% load -300 -400 -400 mvpk 50% load no load +300 +400 +400 mvpk recovery 2 50% load 100% load 25 25 25 sec no load 50% load 500 500 500 sec 50% load no load 7 7 7 msec step line changes output input step 17 to 40 v dc +180 +180 +180 mvpk transient input step 40 to 17 v dc -600 -600 -600 mvpk recovery 2 input step 17 to 40 v dc 400 400 400 sec input step 40 to 17 v dc 400 400 400 sec turn-on v in = 17 to 40v dc overshoot i out = 0 to full load 0 5 0 0 3 0 0 6 0 0 3 0 0 500 mvpk delay 3 8 14 8 14 8 14 msec load fault recovery 4 v in = 17 to 40v dc 8 14 8 14 8 14 msec weight standard package 55 55 55 grams flange package 58 58 58 grams specifications t case = -55c to +85c, v in = + 28v 5% unless otherwise specified. absolute maximum ratings input voltage 1 -0.5v to +50v powe r 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 2 notes: 1 . above +85c case temperature, derate output power linearly to 0 and maximum input voltage linearly to 42v at 115c 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 16v dc , derate output power by 33%.
conditions -55c - tc - +105c, v in - 28 v dc ahe2805s/es ahe2812/es ahe2815s/es parameter 5%, c=0, unless otherwise specified min typ max min typ max min typ max units static characteristics output v in = 17 to 40 v dc voltage i out = 0 to full load 4.90 5.00 5.10 11.76 12.00 12.24 14.70 15.00 15.30 v dc current 0.0 3000 0.0 1667 0.0 1333 ma dc ripple full load, dc to 1mhz 20 60 30 60 30 60 mvpp accuracy t case = 25c, i out = 0 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 v dc power 1 15 20 20 w regulation line v in = 17 to 40v dc 0.5 1.0 0.5 1.0 0.5 1.0 % load i out = 0 to full load 0.5 1.0 0.5 1.0 0.5 1.0 % input voltage range 4 17.0 28.0 40.0 17.0 28.0 40.0 17.0 28.0 40.0 v dc current inhibited 8 18 8 18 8 18 ma dc no load 35 35 35 ma dc ripple current full load 20 50 25 50 25 50 mv p-p efficiency t case = +25c 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 666w isolation input to output @ 500v dc 100 100 100 m w dynamic characteristics step load changes output 50% load 100% load 150 200 200 mvpk transient no load 50% load -300 -400 -400 mvpk 50% load no load +300 +400 +400 mvpk recovery 2 50% load 100% load 25 25 25 sec no load 50% load 500 500 500 sec 50% load no load 7 7 7 msec step line changes output input step 17 to 40v dc +180 +180 +180 mvpk transient input step 40 to 17v dc -600 -600 -600 mvpk recovery 2 input step 17 to 40v dc 400 400 400 sec input step 40 to 17v dc 400 400 400 sec turn-on v in = 17 to 40v dc overshoot i out = 0 to full load 0 500 300 600 300 750 mvpk delay 3 8 14 8 14 8 14 msec load fault recovery 4 v in = 17 to 40v dc 8 14 8 14 8 14 msec weight standard package 60 60 60 grams flange package 65 65 65 grams specifications t case = -55c to +105c, v in = + 28v 5% unless otherwise specified. absolute maximum ratings input voltage 5 -0.5v to +50v power output internally limited, 17.5w typical for ahe2805s/es, 22.5w typical for ahe2812s/es and ahe2815s/es soldering 300c for 10 seconds temperature range 1 operating -55c to +125c case storage -65c to + 135c 3 notes: 1. above +105c case temperature, derate output power linearly to 0 at 125c 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 16v dc , derate output power by 33%. 5. above +85c case temperature, derate maximum input voltage linearly to 33v at +125c case.
conditions -55c - tc - +125c , v in - 28 v dc ahe2805s/hb&ch ahe2812s/hb&ch ahe2815s/hb&ch parameter 5%, c=0, unless otherwise specified min typ max min typ max min typ max units static characteristics output v i n = 1 7 to 40 v dc voltage i out = 0 to full load 4.90 5.00 5.10 11.76 12.00 12.24 14.70 15.00 15.3 0 v dc current 0.0 3000 0.0 1 667 0.0 133 3 m a dc ripple full load, dc to 1mhz 20 60 30 60 30 60 mv p-p accuracy t case = 25c, i out = 0 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.1 5 v dc power 1 15 20 20 w regulation line v in = 17 to 40 v dc 10 25 30 60 40 75 m v t case = 25c 5 30 35 load i out = 0 to full load 10 50 50 1 2 0 50 1 5 0 mv input voltage range 4 17.0 28.0 40.0 17.0 28.0 40.0 17.0 28.0 40.0 v dc current inhibited 8 18 8 18 8 18 ma dc no load 35 35 35 m a dc ripple current ful l load 20 50 25 50 25 50 m v p-p efficiency t case = +25 c full load 80 82 80 83 80 84 % capacitiv e load no effect on performance 5 0 0 1000 200 1000 200 1000 f load fault power shor t circuit t c = 25c 4.5 4.5 4.5 w dissipation overload t c = 25c 6 6 6 w isolation input to output @ 500 v dc 100 100 100 m w dynamic characteristics step load changes output t c = 25c 50% load 100% load 150 300 200 300 200 300 mvpk transient no load 50% load -300 -500 -400 - 50 0 -400 - 50 0 mvpk 50% load no load +300 +500 +400 + 50 0 +400 + 50 0 mvpk recovery 2 50% load 100% load 25 70 25 70 25 70 sec no load 50% load 1 0 0 2 0 0 5 0 0 1500 500 1500 sec 50% load no load 5 5 5 msec step line changes output t c = 25c input step 17 to 40 v dc +180 +300 +180 + 50 0 +180 +500 mvpk transient input step 40 to 17 v dc -600 -1000 -600 -1500 -600 -1500 mvpk recovery 2 input step 17 to 40 v dc 400 800 400 800 4 00 80 0 sec input step 40 to 17 v dc 400 800 400 80 0 400 80 0 sec turn-on v in = 17 to 40 v dc overshoot i out = 0 to full load 0 5 5 0 3 0 0 6 0 0 3 0 0 5 0 0 mvpk delay 3 8 10 8 10 8 10 msec load fault recovery 4 v in = 17 to 40 v dc 8 10 8 10 8 10 msec weight standard package 55 55 55 grams flange package 58 58 58 grams specifications t cas e = -55c to +125c, v in = + 28v 5% unless otherwise specified. absolute maximum ratings input voltage 1 -0.5v to +50v powe r output internally limited, 17.5w typical for ahe2805s/hb & ch, 22.5w typical for ahe2812s/hb&ch and ahe2815s/hb&ch soldering 300c for 10 seconds temperature range 1 operating -55c to + 1 2 5c case storage -65c to + 135c notes: 1 . above +125c case temperature, derate output power linearly to 0 at 135c 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 16v d c , derate output power by 33%. 4
application information inhibit function 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 circuit voltage of the inhibit input is 11.5 1vdc. emi filter an optional emi filter (afc461) will reduce the input ripple current to levels below the limits imposed by mil-std-461 ceo3. output adjust (ahe2805) only the output voltage of the ahe2805 can be adjusted upward by connecting output adjust (pin 3) and output common (pin 4) as shown in table 1. 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 fre- quency noise). because of the low frequency nature of this noise (typically less than 10 k hz), it is difficult to filter out and may interfere with proper operation of sensitive systems (communications, radar or telemetry). lam bd a advanced analog offers an option which provides synchronization of multiple ahe/atw/ a t o type converters, thus eliminating this type of noise. to take advantage of this capability, the system designer must assign one of the converters as the master. then, by definition, the remaining convert- ers become slaves and will operate at the masters switching frequency. the user should be aware that the synchronization system is fail-safe; that is, the slaves will continue operating should the master frequency be interrupted for any reason. the layout must be such that the synchronization output (pin 9) of the master device is connected to the synchroni- zation input (pin 9) of each slave device. it is advisable to keep this run short to minimize the possibility of radiating the 250 k hz switching fre- quency. the appropriate parts must be ordered to utilize this feature. after selecting the converters required for the system, an mstr suffix is added for the master converter part number and an slv suffix is added for slave part number. see part number section. block diagram resistance output voltage pin 3 to 4 increas e % 0 390k + 1% 145k + 2% 63k + 3% 22k + 4% 0 + 5% table 1 output adjustment resistor values 5 error amp & ref 4 output filter 5 3 controller 10 input filter 2 1 9
part number ahe 28 xx s x / x - xxx model synchronization option mstrmaster input voltage slvslave output voltage temperatur e range 05 C 5 v dc omit for -55c to +85c 12 C 12v dc es C -55c to +105c 15 C 15v dc hb C -55c to +125c single output package option f C flange omit standard pin designation pin 1 positive input pin 1 0 input common pin 2 inhibit input pin 9 n/c or sync pin 3 output adjust* pi n 8 cas e gnd pin 4 output common pin 7 n/c pin 5 positive output pin 6 n/c *ahe2805s only. ahe2812s/2815s have n/c on pin 3 typical synchronization connection diagram standardized military drawing cross reference standardized vendor vendor military drawing cage similar pin number pin 5962-8968301hxx 52467 ahe2805s/ ch 5962-8968301hzx 52467 ahe2805sf/ ch 5962-8968302hxx 52467 ahe2805s/ ch-slv 5962-8968302hzx 52467 ahe2805sf/ ch -slv 5962-8968303hxx 52467 ahe2805s/ ch-mstr 5962-8968303hzx 52467 ahe2805sf/ ch -mstr standardized vendor vendor military drawing cage similar pin number 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 standardized vendor vendor military drawing cage similar pin number 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 filter afc461 ahe2805s/es-mstr master 1 10 5 4 +5 v comm ahe2815d/es-slv slave 1 10 4 5 +15 v comm 1 10 5 4 +12 v comm 3 ?5 v ahe2812s/es-slv slave 2 2 system bus 9 6
ahe2805s output power derating vs ambient temperature ahe2812s efficiency ahe2805 temperature rise above ambient vs output power ambient temperature ( ?c ) ahe2815s efficiency temperature ( ?c ) output power ( watts ) efficiency ( % ) temperature rise (?c) efficiency (%) output power (watts) output power (watts) ahe2812s efficiency output power (watts) efficiency (%) 7
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mechanical outline 0.800 (20.320) 2.110 (53.594) 0.495 12.573 x pin #1 4 x 0.400 (10.160) 1.600 (40.640) = 0.040d (1.016) 0.260l (6.604) .090r max standard 1.12max (34.163) 0.800* (20.320) 1.110* (28.194) 0.162d* 2 places (4.115) 2.870 ?.010 (72.898 ?254) 2.120 max 0.495* (12.573) x pin #1 2.550* ?.010 (64.770) 4 x 0.400* (10.160) 1.600* (40.640) = 0.040d* (1.016) 0.260l (6.604) .050r f optio n *?005 (?.127) 0.050* typ (1.270) 10 6 1 5 input common n/c or sync n/c case ground pos. input pos. output inhibit input output adjust output common bottom view 9 ahe2805s 10 6 1 5 input common n/c or sync n/c case ground pos. input pos. output inhibit input n/c output common bottom view 9 ahe2812s/ahe2815s hb & ch screening process per mil-std-883 test inspection method conditlon pre-seal internal visual 2017 stabilization bake 1008 c temperature cycling 1010 c constant acceleration 2001 a , y 1 direction burn-in 1015 t c = +125 c final electrical test t c = -55 ,+25,+125c external visual 2009 gross leak 1014 c fine leak 1014 a es screening process same as hb screening except as follows: test inspection method constant acceleration 2001, 500g's burn-in 1015, 96 hrs. final electrical 25 c only 10
lambda advanced analog the information in this data sheet has been carefully checked and is believed to be accurate; however no responsibility is assumed for possible errors. these specifications are subject to change without notice. 9849 lambda advanced analog inc. l mil-prf-38534 certified iso9001 registered 2270 martin avenue santa clara ca 95050-2781 (408) 988- 4930 fax (408) 988-2702 notes

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