10/25/02 www.irf.com 1 advanced analog hybrid-high reliability dc/dc converters atw28xxs series description 19 to 40 vdc input range (28 vdc nominal) 30 watts output power indefinite short circuit and overload protection 22.8 w/in 3 power density 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 83% shutdown from external signal military screening 250,000 hour mtbf at 85c features atw 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 elements in the 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 does not incorporate the element evaluation and periodic in- spection (pi) requirements of mil-prf-38534. 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 a more limited screening process are also available for use in less demanding applications. variations in electrical, mechanical and screening can be accommodated. contact advanced analog for special requirements. mil-prf-38534 compliant versions available three standard temperature grades are offered. refer to part number section. these devices are provided in a flanged package for secure mounting in severe envi- ronments. the atw28xxs 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 op- erate with a nominal 28 vdc input and are available with single outputs at 5v,12v and 15v. the circuit de- sign incorporates a pulse width modulated push-pull topology operating in the feed-forward mode at a nomi- nal switching frequency of 270khz. input to output isolation is achieved through the use of transformers in the forward and feedback circuits. pd - 94556
2 www.irf.com atw28xxs series specifications for notes to specifications, refer to page 3 table i. electrical performance characteristics ATW2805S 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 4.95 5.05 v 2,3 4.90 5.10 output current 1 i out v in = 19, 28, and 40 v dc 1,2,3 all 0 6000 ma output ripple voltage 2 v rip v in = 19, 28, and 40 v dc, b.w. = dc to 2mhz 1,2,3 all 50 mvp-p output power 1, 3 p out v in = 19,28, and 40 v dc 1,2,3 all 30 w line regulation 4 vr line v in = 19, 28, and 40 v dc, iout = 0, 3000, and 6000ma 1 all 5 mv 2,3 20 load regulation 4 vr load v in = 19, 28, and 40 v dc, i out = 0, 3000, and 6000ma 1,2,3 all 30 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 2 i rip i out = 6000ma b.w. = dc to 2mhz 1,2,3 all 20 map-p efficiency e ff i out = 6000ma 1 all 78 % t c = +25 c isolation iso input to output or any pin to case (except pin 7) at 500 v dc tc = +25c 1 all 100 m ? capacitive load 5, 6 c l no effect on dc performance, tc = +25c 4 all 500 f power dissipation load fault p d overload, t c = +25 c 7 1 all 12 w short circuit, t c = +25 c 9 switching frequency f s i out = 6000ma 4,5,6 01 250 300 khz 02 250 270 03 275 300 output response to step transient load changes 8 vo tload 4000ma to/from 6000ma 4,5,6 all -500 +500 mv pk 500ma to/from 2500ma 4,5,6 -500 +500 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 atw28xxs series notes to specifications table i. electrical performance characteristics - continued ATW2805S 1 parameter guaranteed by line and load regulation tests. 2 bandwidth guaranteed by design. tested for 20 khz to 2 mhz. 3 above +125 c case, derate output power linearly to 0 at +135 c. 4 output voltage measured at load with remote sense leads connected across load. 5 capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in excess 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. 6 parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limits specified in table i. 7 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. 8 load step transition time between 2 and 10 microseconds. 9 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. 10 turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal from the inhibit pin (pin 1) while power is applied to the input is unlimited. 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 8, 9 tt load 4000ma to/from 6000ma 4 all 100 s 5,6 200 500ma to 2500ma 4 all 100 5,6 200 turn on overshoot vton os i out = 0 and 6000ma 4,5,6 all 500 mv pk turn on delay 10 ton d i out = 0 and 6000ma 4,5,6 all 12 ms load fault recovery 6, 10 tr lf 4,5,6 all 12 ms
4 www.irf.com atw28xxs series specifications table ii. electrical performance characteristics atw2812s for 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 11.88 12.12 v 2,3 11.76 12.24 output current 1 i out v in = 18, 28, and 40 v dc 1,2,3 all 2500 ma output ripple voltage 2 v rip v in = 18, 28, and 40 v dc, b.w. = 20hz to 2mhz 1,2,3 all 50 mvp-p line regulation vr line v in = 18, 28, and 40 v dc, iout = 0, 1250, and 2500ma 1 all 30 mv 2,3 60 load regulation vr load v in = 18, 28, and 40 v dc, i out = 0, 1250, and 2500ma 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 50 input ripple current 2 i rip i out = 2500ma b.w. = 20hz to 2mhz 1,2,3 all 20 map-p efficiency e ff i out = 2500ma 1 all 78 % 2,3 75 isolation iso input to output or any pin to case (except pin 7) at 500 v dc tc = +25c 1 all 100 m ? capacitive load 3, 4 c l no effect on dc performance, tc = +25c 4 all 200 f power dissipation load fault p d overload 5 1 all 12 w short circuit 1,2,3 9 switching frequency f s i out = 2500ma 4,5,6 01 250 300 khz 02 250 270 03 275 300 output response to step transient load changes 6 vo tload 1250ma to/from 2500ma 4,5,6 all -800 +800 mvpk 0ma to/from 1250ma -1000 +1000 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 atw28xxs series table ii. electrical performance characteristics - continued notes to specifications atw2812s 1 parameter guaranteed by 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 excess 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. thereafter, parameters shall be guaranteed to the limits specified in table ii. 5 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. 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 ground signal from the inhibit pin (pin 2) while power is applied to the input. 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 6, 7 tt load 1250ma to/from 2500ma 4 all 100 s 5,6 200 0ma to 1250ma 4 all 5 ms 5,6 10 output response to vo tline input step 18v to/ from 4,5,6 all -1000 +1000 mvpk transient step 40v dc, line changes i out = 2500ma 4, 8 recovery time tt line input step 18v to/ from 4,5,6 all 500 s transient step 40v dc line changes i out = 2500ma 4, 7, 8 turn on overshoot vton os i out = 0 and 2500ma 4,5,6 all 600 mvpk turn on delay ton d i out = 0 and 2500ma 9 4,5,6 all 12 ms load fault recovery 4, 9 tr lf 4,5,6 all 12 ms
6 www.irf.com atw28xxs series specifications table iii. electrical performance characteristics atw2815s for notes to specifications, refer to page 7 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 1 i out v in = 17, 28, and 40 v dc 1,2,3 all 0 1333 ma output ripple voltage 2 v rip v in = 17, 28, and 40 v dc, b.w. = dc to 2mhz 1,2,3 all 60 mv p-p output power 1, 3 p out v in = 17,28, and 40 v dc 1,2,3 all 20 w line regulation vr line v in = 17, 28, and 40 v dc, iout = 0, 677, and 1333ma 1 all 35 mv 2,3 75 load regulation vr load v in = 17, 28, and 40 v dc, i out = 0, 677, and 1333ma 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 35 input ripple current 2 i rip i out = 1333ma b.w. = dc to 2mhz 1,2,3 all 50 ma p-p efficiency e ff i out = 1333ma 1 all 80 % t c = +25 c isolation iso input to output or any pin to case (except pin 8) at 500 v dc tc = +25c 1 all 100 m ? capacitive load 4, 5 c l no effect on dc performance, tc = +25c 4 all 200 f power dissipation load fault p d overload, t c = +25 c 6 1 all 6 w short circuit, t c = +25 c 6 switching frequency f s i out = 1333ma 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/from 100% load 4 all -300 +300 mvpk 5,6 -450 +450 no load to/from 50% load 4 -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 7 atw28xxs series table iii. electrical performance characteristics - continued atw2815s notes to specifications 1 parameter guaranteed by line and load regulation tests. 2 bandwidth guaranteed by design. tested for 20 khz to 2 mhz. 3 for operation at 16 vdc input, derate output power by 33 percent. 4 capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in excess 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. 5 parameter shall be tested as part of design characterization and after design or process changes. thereafter, parameters shall be guaranteed to the limits specified in table iii. 6 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. 7 load step transition time between 2 and 10 microseconds. 8 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. 9 input step transition time between 2 and 10 microseconds. 10 turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal from the inhibit pin (pin 2) while power is applied to the input. 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 7, 8 tt load 50% load to/from 100% load 4 all 70 s 5,6 100 no load to 50% load 4,5,6 1500 50% load to no load 4,5,6 5 ms output response to transient step line changes 5, 9 vo tline input step 17 to 40 vdc 4,5,6 all 500 mvpk input step 40 to 17 vdc 4,5,6 1500 recovery time transient line changes 5, 8, 9 tt line input step 17 tp 40 vdc 4,5,6 all 800 ms input step 40 to 17 vdc 4,5,6 800 turn on overshoot vton os i out = 0 and 1333ma 4,5,6 all 600 mvpk turn on delay 10 ton d i out = 0 and 1333ma 4,5,6 all 10 ms load fault recovery 5 tr lf 4,5,6 all 10 ms weight flange 75 grams
8 www.irf.com atw28xxs 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. atw28xxs 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 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 8) of the master device is connected to the synchronization input (pin 8) 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. see part number section. typical synchronization connection remote sense (ATW2805S only) better than 0.1% line and load regulation (case tempera- ture constant) are typical when the remote sense leads are used. if the remote sense leads are left unconnected, then the output voltage (measured at pins 4 and 5) will rise to approximately 5.4 vdc. if the remote sense leads are shorted together, the output voltage may rise above 10 vdc depending on load, possibly damaging both the converter and load. whenever multiple dc/dc converters are utilized in a single system, significant low frequency noise may be generated due to the sight differences 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 synchro- nization of multiple ahe/atw type converters, thus elimi- nating this type of noise. atw 28xxd atw 28xxs afc461 or afv461 atw 28xxd 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 out p ut out p ut 5 4 +vout return pulse width modulator emi filter 1 2 10 +input enable input return error amp & ref -sense fb drive 1 drive 2 8 sync 6 +sens e 3
www.irf.com 9 atw28xxs series pin designation atw28xxs case outlines part numbering 2.70 0 max 2.360 1.350 max 1.95 0.500 max 0.05 0.040 d x 0.26 l pins 4 x 0.400 =1.600 610 9 8 7 123 5 4 1.000 atw 28 05 s / ch - mstr model input v oltage 28 = 28v nominal output voltage sin g le - 05, 12, 15vdc dual - 12 = 12v, 15 = 15v outputs s = sin g le d = dual screening ? , es, h b, c h sync option mstr = master slv = slave omit for standard pin no. designation 1 positive input 2 inhibit input 3 neg. remote sense * 4 output common 5 positive output 6 pos. remote sense * 7 case ground 8 n/c (or sync. option) 9 n/c 10 input common * ATW2805S only. atw2812s, atw2815s have n/c enable input input return output return
10 www.irf.com atw28xxs 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 atw28xxs 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 c cond a yes yes constant acceleration 2001, cond a 500g 5,000g 5,000g burn-in 1015 48hrs @ 85 c 48hrs @ 105 c 160hrs @ 125 c 160hrs @ 125 c final electrical (group a) mil-prf-38534 & specification 25 c 25 c -55, +25, +125 c -55, +25, +125 c seal, fine & gross 1014 yes yes yes external visual 2009 ? yes yes yes standardized vendor vendor military drawing cage similar pin code pin 5962-9157904hzx 52467 ATW2805S/ch 5962-9157905hzx 52467 ATW2805S/ch-slv 5962-9157906hzx 52467 ATW2805S/ch-mstr 5962-9211001hzx 52467 atw2812s/ch 5962-9211002hzx 52467 atw2812s/ch-slv 5962-9211003hzx 52467 atw2812s/ch-mstr 5962-9159904hzx 52467 atw2815s/ch 5962-9159905hzx 52467 atw2815s/ch-slv 5862-9159906hzx 52467 atw2815s/ch-mstr 115c -55c to+85c
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