09/11/02 www.irf.com 1 advanced analog high reliability hybrid dc/dc converters asa28xxs series description up to 5 watt output power 5, 12,15 volt outputs high reliability wide input voltage range -16 to 40 volts 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 features asa 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 re- sponse for superior line and load transient characteris- tics and offers greater reliability than devices incorpo- rating optical feedback circuits. this device is designed to meet mil-std-704d input requirements offering full performance over a 16 to 40 volt input range. output power of up to 5 watts is avail- able. connecting the inhibit pin (pin 5) to the input common (pin 7) will cause the converter to shut down. it is rec- ommended 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 0.5 volts. these converters are manufactured in a facility fully qualified to mil-prf-38534. all processes used to manufacture these converters have been qualified thereby enabling advanced analog to deliver fully com- pliant devices. three standard temperature grades are offered with the screening options. refer to screening level section. the ch grade converters are fully com- pliant to mil-prf-38534 for class h. the hb grade converters are processed with the same screening as the ch grade, but do not have class h element evalua- tion as required by mil-prf-38534. these two grades are fully tested and operate over the full military tem- perature range without derating of output power. a commercial grade is also available. variations in elec- trical, mechanical and screening requirements can be accommodated. extensive computer simulation using complex modeling allows design modifications to be examined. contact advanced analog with specific requirements. pd - 94539
2 www.irf.com asa28xxs series specifications for notes to specifications, refer to page 3 absolute maximum ratings input voltage -0.5 v to 50 v continuous. 80 v, 100 msec power output internally limited (6.5 w typical) soldering 300c for 10 sec. temperature range operating -55c to +125c case storage -65c to +150c 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 1 1 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
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 20 khz to 2 mhz. 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 and 10 microseconds. 7. 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. 8. input step transition time between 2 and 10 microseconds. 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. available screening levels and process variations for asa28xxs series requirement mil-std-883 method no suffix es suffix hb suffix ch suffix temperature range -20c to +85c -55c to +125c -55c to +125c -55c to +125c element evaluation mil-prf-38534 internal visual 2017 temperature cycle 1010 cond b cond c cond c constant acceleration 2001, 500g cond a cond a burn-in 1015 48hrs @ 85 c 48hrs @ 125c 160hrs @ 125c 160hrs @ 125c final electrical (group a) mil-prf-38534 25c 25c -55, +25, +125c -55, +25, +125c seal, fine & gross 1014 cond c cond a, c cond a, c cond a, c external visual 2009 * per commercial standards available standard military drawing (smd) cross reference asa 28 05 s / ch 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 part numbering asa2805s/ch 5962-9462901 asa2812s/ch 5962-9463101 asa2815s/ch 5962-9463001
4 www.irf.com asa28xxs series asa28xxs pin designation 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. 09/02 asa28xxs block diagram controller error amplifier 1 2 8 6 7 5 case return +output enable return +input 0.800 .005 1.075 0.220 0.270 1.075 0.800 0.025 .003 dia pins 12345 6 87 asa28xxs case outline pin no. designation 1 positive output 2 output return 3 n/c 4 n/c 5 enable 6 positive input 7 input return 8 case
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