www.irf.com 1 asa28xxs series description up to 5.0w output power 5v, 12v,15v outputs high reliability wide input voltage range -16v to 40v indefinite short circuit and overload protection popular industry standard pin-out military screening available parallel seam welded package no external capacitors required input voltage surge protected to mil-std-704a under voltage lockout available as standard military drawing standard microcircuit drawings available features 28v input, single output the asa28xxs series of dc/dc converters are high reliability thick film hybrid converters that use flyback topology operating at a nominal frequency of 550khz. high input to output isolation is achieved through the use of transformers in the flyback power and feedback circuits. the advanced feedback design provides fast loop response for superior line and load transient characteristics and offers greater reliability than devices incorporating optical feedback circuits. this device is designed to meet mil-std-704d input requirements offering full performance over a 16v to 40v input range. output power of up to 5w is available. connecting the inhibit pin (pin 5) to the input common (pin 7) 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 400 a. the open circuit voltage of the inhibit pin is 11.5 0.5v. manufactured in a facility fully qualified to mil-prf- 38534, these converters are fabricated utilizing dscc qualified processes. for available screening options, refer to device screening table in the data sheet. variations in electrical, mechanical and screening requirements can be accommodated. extensive computer simulation using complex modeling allows design modifications to be examined. contact ir santa clara with specific requirements. 01/11/07 hybrid-high reliability dc/dc converter asa pd-94539a
2 www.irf.com asa28xxs series specifications for notes to specifications, refer to page 3 asa2805s/xx asa2812s/xx asa2815s/xx test conditions -55 t c +125c v in = 28v dc 5% c l = 0 unless otherwise specified group a subgroups min max min max min max unit 1 4.95 5.05 11.88 12.12 14.85 15.15 output voltage i out = 0 2, 3 4.90 5.10 11.76 12.24 14.70 15.30 v output current 1 v in = 16, 28, and 40 v dc 1, 2, 3 1000 417 333 ma 1 190 200 200 output ripple voltage 2 v in = 16, 28 and 40 v dc 2, 3 475 290 290 mv pp 1 25 25 25 line regulation v in = 16, 28, and 40 v dc i out = 0, 50%, 100% i max 2, 3 50 50 50 mv 1 25 25 25 load regulation v in = 16, 28, and 40 v dc i out = 0, 50%, 100% i max 2, 3 50 50 50 mv i out = 0 pin 5 to pin 7 18 18 18 input current i out = 0 pin5 open 1, 2, 3 50 50 50 ma input ripple current 2 i out = i max 1, 2, 3 100 100 100 ma pp 1 71 71 efficiency i out = i max 2, 3 66 68 68 % isolation - input to output or any pin to case v test 500 vdc, tc= +25c 1 100 100 100 m ? capacitive load 3, 4 no effect on dc performance, tc = +25c 4 500 200 200 f overload 5 4.0 4.0 4.0 power dissipation, load fault short circuit 1, 2, 3 2.0 2.0 2.0 w switching frequency 4 i out = i max 4, 5, 6 500 600 500 600 500 600 khz 4 -300 +300 ? i max i max 5, 6 -450 +450 -450 +450 -400 +450 4 -500 +500 output response to step transient load changes 6 0 ma i max 5, 6 -750 +700 -750 +750 -800 +750 mv pk i out = i max 200 100 100 s recovery time, step transient load changes 0 ma ? i max 4, 5, 6 1.0 1.0 1.0 ms output response transient step line changes 4 8 input step 16 40 v dc i out = i max 4, 5, 6 500 1000 1000 mv pk recovery time transient step line changes 4, 7, 8 input step 16 40 v dc i out = i max 4, 5, 6 800 800 800 s turn on overshoot i out = 0 ma, i max 4, 5, 6 600 600 600 mv pk turn on delay 9 i out = 0 or i max 4, 5, 6 20 25 25 ms load fault recovery 4 4, 5, 6 20 25 25 ms input voltage -0.5v to +50vdc continous, 80v, 100 msec power output internally limited ( 6.5w typical ) soldering temperature 300c for 10 seconds operating case temperature -55c to +125c storage case temperature -65c to +135c absolute maximum ratings
www.irf.com 3 asa28xxs series notes to specifications 1. parameter guaranteed and measured during line and load regulation tests. 2. bandwidth guaranteed by design. tested for 20khz to 2mhz. 3. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in exces s of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry , appearing as a short circuit during turn-on. 4. parameter shall be tested as part of design characterization and after design or process changes. 5. an overload is that condition of load in excess of rated load but less than that necessary to trigger the short circuit prote ction and is the condition of maximum power dissipation. 6. load step transition time between 2 s and 10 s. 7. 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. 8. input step transition time between 2 s and 10 s. 9. turn-on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input. block diagram controller error amplifier 1 2 8 6 7 5 case output return +output inhibit input return +input standard microcircuit drawing equivalence table standard microcircuit ir standard drawing number part number 5962-94629 asa2805s 5962-94630 asa2815s 5962-94631 asa2812s
4 www.irf.com asa28xxs series 0.800 .005 1.075 0.220 0.270 1.075 0.800 0.025 .003 dia pins 12345 6 87 mechanical outline pin designation pin # designation 1 + output 2 output return 3nc 4nc 5 inhibit 6 + input 7 input return 8 case ground
www.irf.com 5 asa28xxs series world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 252-7105 ir santa clara: 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.01/2007 part numbering notes: best commercial practice sample tests at low and high temperatures -55c to +105c for ahe, ato, atw device screening requirement mil-std-883 method no suffix es hb ch temperature range -20c to +85c -55c to +125c -55c to +125c -55c to +125c element evaluation mil-prf-38534 n/a n/a n/a class h non-destructive bond pull internal visual 2017 yes yes yes temperature cycle 1010 n/a cond b cond c cond c constant acceleration 2001, y1 axis n/a 500 gs 3000 gs 3000 gs pind 2020 n/a n/a n/a n/a burn-in 1015 n/a 48 hrs@hi temp 160 hrs@125c 160 hrs@125c final electrical mil-prf-38534 25c 25c -55c, +25c, -55c, +25c, ( group a ) & specification +125c +125c pda mil-prf-38534 n/a n/a n/a 10% seal, fine and gross 1014 cond a cond a, c cond a, c cond a, c radiographic 2012 n/a n/a n/a n/a external visual 2009 yes yes yes n/a n/a 2023 n/a n/a asa 28 05 s /ch model input voltage 28 = 28v output voltage 05 = 5v 12 = 12v 15 = 15v output s = single screening level (please refer to screening table) no suffix, es, hb, ch
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