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lambda advanced analog inc. l l atw2800s series single output, hybrid - high reliability dc/dc converter description features the atw2800s 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 28v dc inputs with +5, +12v and +15v single outputs. the circuit design incorporates a pulse width modulated push-pull topology operating in the feed-forward mode at a nominal switching frequency of 270khz. 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 characteristics and offers greater reliability and radiation tolerance than devices incorporating optical feedback circuits. three standard temperature grades are offered. refer to part number section. they are provided in a flanged package for more severe enviroments. manufactured in a facility fully qualified to mil-prf- 38534, these converters are available in four screening 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 may not necessarily meet all of the other mil-prf-38534 requirements, e.g., element evaluation and periodic inspection (p.i.) not required. 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 more limited screening are also available for use in less demanding applications. variations in electrical, mechanical and screening can be accommodated. contact lambda advanced analog for special requirements. n n 19 to 40 volt input range (28v dc nominal) n n 30 watts output power n n indefinite short circuit and overload protection n n 22.8 w/in 3 power density n n fast loop response for superior transient characteristics n n operating temperature range from -55c to +125c available n n popular industry standard pin-out n n resistance seam welded case for superior long term hermeticity n n efficiencies up to 83% n n shutdown from external signal n n military screening n n 250,000 hour mtbf at 85c n n mil-prf -38534 compliant versions available
2 specifications atw2805s absolute maximum ratings input voltage -0.5v to 50v soldering temperature 300c for 10 seconds case temperature operating -55c to +125c storage -65c to +135c table i. electrical performance characteristics test symbol conditions -55 c t c +125 c v in = 28 v dc 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 i n = 19, 28, and 40 v dc 1,2,3 all 0.0 6000 ma output ripple voltage 2 / v rip v in = 19, 28, and 40 v dc b.w. = dc to 2 mhz 1,2,3 all 50 mv p-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 i out = 0, 3000, and 6000 ma 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 6000 ma 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 = 6000 ma b.w. = dc to 2 mhz 1,2,3 all 20 ma p-p efficiency e ff i out = 6000 ma, t c = +25 c 1 all 78 % isolation iso input to output or any pin to case (except pin 7) at 500 v dc, t c = +25 c 1 all 100 m w capacitive load 5 / 6 / c l no effect on dc performance, t c = +25 c 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 see footnotes at end of table.
3 atw2805s table i. electrical performance characteristics - continued. test symbol conditions -55 c t c +125 c v in = 28 v dc 5%, c l = 0 unless otherwise specified group a subgroups device type limits unit min max switching frequency f s i out = 6000 ma 4,5,6 01 250 300 khz 02 250 270 03 275 300 output response to step transient load changes 8 / vo tload 4000 ma to/from 6000 ma 4,5,6 all -500 +500 mv pk 500 ma to/from 2500 ma 4,5,6 all -500 +500 recovery time step transient load changes 8 / 9 / tt load 4000 ma to/from 6000 ma 4 all 100 s 5,6 200 500 ma to/from 2500 ma 4 all 100 5,6 200 turn on overshoot vton os i out = 0 and 6000 ma 4,5,6 all 500 mv pk turn on delay 10 / ton d i out = 0 and 6000 ma 4,5,6 all 12 ms load fault recovery 6 / 10 / tr lf 4,5,6 all 12 ms notes: 1 / parameter guaranteed by line and load regulation tests. 2 / bandwidth guaranteed by design. tested for 20 k hz 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 a ground signal from the inhibit pin (pin 2) while power is applied to the input.
4 specifications atw2812s absolute maximum ratings input voltage -0.5v to 50v soldering temperature 300c for 10 seconds case temperature operating -55c to +125c storage -65c to +135c table ii. electrical performance characteristics test symbol conditions -55 c t c +125 c v in = 28 v dc 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 0.0 6000 ma output ripple voltage 2 / v rip v in = 19, 28, and 40 v dc b.w. = dc to 2 mhz 1,2,3 all 50 mv p-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 i out = 0, 3000, and 6000 ma 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 6000 ma 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 = 6000 ma b.w. = dc to 2 mhz 1,2,3 all 20 ma p-p efficiency e ff i out = 6000 ma, t c = +25 c 1 all 78 % isolation iso input to output or any pin to case (except pin 7) at 500 v dc, t c = +25 c 1 all 100 m w capacitive load 5 / 6 / c l no effect on dc performance, t c = +25 c 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 see footnotes at end of table.
5 atw2812s table ii. electrical performance characteristics - continued. test symbol conditions -55 c t c +125 c v in = 28 v dc 5%, c l = 0 unless otherwise specified group a subgroups device type limits unit min max switching frequency f s i out = 6000 ma 4,5,6 01 250 300 khz 02 250 270 03 275 300 output response to step transient load changes 8 / vo tload 4000 ma to/from 6000 ma 4,5,6 all -500 +500 mv pk 500 ma to/from 2500 ma 4,5,6 all -500 +500 recovery time step transient load changes 8 / 9 / tt load 4000 ma to/from 6000 ma 4 all 100 s 5,6 200 500 ma to/from 2500 ma 4 all 100 5,6 200 turn on overshoot vton os i out = 0 and 6000 ma 4,5,6 all 500 mv pk turn on delay 10 / ton d i out = 0 and 6000 ma 4,5,6 all 12 ms load fault recovery 6 / 10 / tr lf 4,5,6 all 12 ms weight flange 75 grams notes: 1 / parameter guaranteed by line and load regulation tests. 2 / bandwidth guaranteed by design. tested for 20 k hz 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 ii. 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 a ground signal from the inhibit pin (pin 2) while power is applied to the input.
6 specifications atw2815s absolute maximum ratings input voltage -0.5v to 50v soldering temperature 300c for 10 seconds case temperature operating -55c to +125c storage -65c to +135c table iii. electrical performance characteristics test symbol conditions -55 c t c +125 c v in = 28 v dc 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 0.0 1333 ma output ripple voltage 2 / v rip v in = 17, 28, and 40 v dc b.w. = dc to 2 mhz 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 i out = 0, .677, and 1333 ma 1 all 35 mv 2,3 75 load regulation vr load v in = 17, 28, and 40 v dc i out = 0, .677, and 1333 ma 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 = 1333 ma b.w. = dc to 2 mhz 1,2,3 all 50 ma p-p efficiency e ff i out = 1333 ma, t c = +25 c 1 all 80 % isolation iso input to output or any pin to case (except pin 8) at 500 v dc, t c = +25 c 1 all 100 m w capacitive load 4 / 5 / c l no effect on dc performance, t c = +25 c 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 see footnotes at end of table.
7 atw2815s table iii. electrical performance characteristics - continued. test symbol conditions -55 c t c +125 c v in = 28 v dc 5%, c l = 0 unless otherwise specified group a subgroups device types limits unit min max switching frequency f s i out = 1333 ma 4,5,6 01 225 275 khz 02 225 245 03 250 275 output response to step transient load changes 7 / vo tload 50 percent load to/from 100 percent load 4 all -300 +300 mv pk 5,6 -450 +450 no load to/from 50 percent load 4 all -500 +500 5,6 -750 +750 recovery time step transient load changes 7 / 8 / tt load 50 percent load to/from 100 percent load 4 all 70 s 5,6 100 no load to 50 percent load 4,5,6 all 1500 50 percent load to no load 4,5,6 all 5 ms output response to transient step line changes 5 / 9 / vo tline input step 17 to 40 v dc 4,5,6 all 500 mv pk input step 40 to 17 v dc 4,5,6 all -1500 recovery time transient line changes 5 / 8 / 9 / tt line input step 17 to 40 v dc 4,5,6 all 800 ms input step 40 to 17 v dc 4,5,6 all 800 turn on overshoot vton os i out = 0 and 1333 ma 4,5,6 all 600 mv pk turn on delay 10 / ton d i out = 0 and 1333 ma 4,5,6 all 10 ms load fault recovery 5 / tr lf 4,5,6 all 10 ms weight flange 75 grams notes: 1 / parameter guaranteed by line and load regulation tests. 2 / bandwidth guaranteed by design. tested for 20 k hz to 2 mhz. 3 / for operation at 16 v dc 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 a ground signal from the inhibit pin (pin 2) while power is applied to the input.
8 block diagram 4 5 controller 10 input filter 2 1 8 error amp & ref 6 output filter 3 available screening levels and process variations for atw 2800s series requirement mil-std-883 method no suffix es suffix hb suffix ch suffix temperatur e range -55 c to +85 c -55 c to +115 c -55 c to +125 c -55 c to +125 c element evaluation mil- prf -38534 internal visual 2017 u 4 4 4 temperatur e cycle 1010, cond c cond a 44 constan t acceleration 2001, cond a 500g 5,000g 5,000g burn-in 1015 96hrs @105 c 160hrs @125 c 160hrs @125 c final electrical (group a) specification 25 c 25 c -55 , +25 , +125 c -55,+25 , +125 c seal, fine & gross 1014 4 4 4 external visual 2009 u 4 4 4 u per commercial standards part number atw 28xx s / x - xxx model synchronization option omit for standard inpu t voltage mstr master slv slave output voltage temperature range singl e output omit for -55c to +85c (industrial) es -55c to +105c (environmental) hb -55c to +125c (military screening) ch -55?c to +125 c (desc compliant)
9 figure 5 load step response load step 0 to 6.0 a dc (no load to full load) 5.5 v 4.5 v figure 6 load step response load step 3.0 to 0 a dc (full load to no load) typical characteristics waveforms shown are for atw2805 figure 1 output ripple voltage v in = 28 v d c , full load 2 mv/div 2 s/div 2 ma/div 2 s/div figure 2 input ripple voltage v in = 28 v dc , full load figure 3 turn-on response @full load 2 ms/div 1 mv/div 1 mv/div 100 s/div figure 4 turn-on response , @full load 2 ms/div 100 mv/div 5.5 v 100 mv/div 4.5 v 100 s/div
1 0 typical characteristics (continued) 100 mv/div 5.5 v 4.5 v 50 s/div figure 7 load step response load step 3.0 a dc to 6.0 a dc (half load to full load) 100 mv/div 6.5 v 4.5 v 50 s/div figure 8 load step response load step 6.0 a dc to 3.0 a dc (full load to half load) figure 1 0 line step response a : output @ 100 mv/div, full load b : input step 40 v dc to 19 v dc 100 s/div figure 9 line step response a : output @ 100 mv v/div, full load b : input step @ 19 v dc to 40 v dc 100 s/div
11 typical characteristics (continued) mechanical outline figure 1 2 audio rejection with afc461 emi filter pin designation pin 1 positive input pin 1 0 inpu t common pin 2 inhibit input pin 9 n/c pin 3 neg. remote sense * pin 8 n/c** pin 4 outpu t common pin 7 cas e ground pin 5 positiv e output pin 6 pos . remot e sense* *atw2805s only. atw2812s, atw2815s have n/c. **or synchronization option. 10 6 1 5 bottom view 1.0 0 0.005 (25.400 0.127) 1.350 max (34.290) 0.162d 0.005 2 places (4.115 0.127) 2.700 max (68.580) 1.950 max (49.530) 0.500 max (12.700) 0.050 max (1.270) 4 x 0.400 0.005 = (10.160 0.127) 1.600 0.010 (40.640 0.254) 0.040d 0.002 x 0.260l 0.010 (1.016 0.050) (6.604 0.254) pin #1 2.360 0.005 (59.944 0.127) 0.090r max
12 application information inhibit function connecting the inhibit input (pin 2) to input com- mon (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 400 a of current. the open cir- cuit voltage of the inhibit input is 11.5 1 v d c . emi filter an optional emi filter (afc461) will reduce the in- put ripple current to levels below the limits im- posed by mil-std-461 ceo3. remote sense (atw2805s only) better than 0.1% line and load regulation (case temperature constant) are typical when the re- mote sense leads are used. if the remote sense leads are left unconnected, then the output volt- age (measured at pins 4 and 5) will rise approxi- mately 5.4 v d c . if the remote sense leads are shorted together, the output voltage may rise above 10 v dc de- pending on load, posibly damaging both the con- verter and load. device synchronization whenever multiple dc/dc converters are utilized in a single system, significant low frequency noise may be generated due to slight differences in the switching frequencies of the converters (beat frequency 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 (communi- cations, radar or telemetry). la mb da advanced ana log offers an option which provides synchron - i z ation of multiple ahe/atw type converters, thus e l i m inat ing this type of noise. typical synchronization connection diagram to take advantage of this capability, the system designer must assign one of the converters as the master. then, by definition, the remaining con- verters 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 8) of the master de- vice is connected to the synchronization input (pin 8) of each slave device. it is advisable to keep this run short to minimize the possibility of radiat- ing the 250 k hz switching frequency. the appropriate parts must be ordered to utilize this feature. after selecting the converters re- quired for the system, 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. standardized military drawing cross reference standardized vendor vendor military drawing cage similar pin number pin 5962-9157904hzx 52467 atw2805s/ch 5962-9157905hzx 52467 atw2805s/ch-slv 5962-9157906hzx 52467 atw2805s/ch-mstr 5962-921101hzx 52467 atw2812s/ch 5962-921102hzx 52467 atw2812s/ch-slv 5962-921103hzx 52467 atw2812s/ch-mstr 5962-915990 4 hzx 52467 atw2815s/ch 5962-915990 5 hzx 52467 atw2815s/ch-slv 5962-915990 6 hzx 52467 atw2815s/ch-mstr output power (watts) efficiency (%) atw2805s efficiency filter atw2805s/es-mstr atw2815d/es-slv slave atw2812s/es-slv slave +5v comm +15v comm -15v +12v comm 5 4 5 4 3 4 5 1 10 1 10 1 10 8 2 8 system bus
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. 984 8 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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