www.irf.com 1 ATW28300S (ir p/n 10207) description 18v to 40v dc input range (28v dc nominal) short circuit and overload protected 22.8w/in 3 power density 30w output power adjustable output voltage fast loop response superior transient characteristics operating temperature range of -55c to +125c popular industry standard pin-out resistance seam welded case for superior long term hermeticity shutdown from external signal full military screening mil-prf-38534 compliant features atw 28v input, 300v single output 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. the ATW28300S dc-dc converter features high power density and an extended temperature range for use in military and industrial applications. designed to mil-std-704d input requirements, this device operates with a nominal 28v dc input with an adjustable output of 150 to 300v via external potentiometer. 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. hybrid high-reliability dc-dc converter manufactured in a facility fully qualified to mil-prf- 38534, this converter is 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 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. for screening options, refer to device screening table. variations in electrical, mechanical and screening can be accommodated. contact ir san jose for special requirements. pd-97418
2 www.irf.com ATW28300S (ir p/n 10207) specifications for notes to specifications, refer to page 3 electrical performance characteristics input voltage (-0.3v to +40v dc ) continuous, (-0.5v to +50v dc ) up to 1 second soldering temperature, lead 300c for 10 seconds operating case temperature -55c to +125c storage case temperature -65c to +135c absolute maximum ratings test symbol conditions -55c tc +125c v in = 28v dc 5%, c l = 0 r adj = 455 ohms group a subgroups limits unit unless otherwise specified min max output voltage min 10 v out v in = 18, 28, and 40v dc 1,2,3 130 145 v dc min i out = 5.0ma, r adj = 30 ohms output voltage max 10 v out v in = 18, 28, and 40v dc 1,2,3 305 320 v dc max i out = 5.0ma, r adj = 940 ohms output voltage stability i out = 100ma up to 1000 hrs 1,2,3 2.0 % output current 8 i out v in = 18, 28, and 40v dc 1,2,3 5.0 100 ma dc output ripple voltage 7 v rip v in = 18, 28, and 40v dc , iout = 50ma, iout = 100ma, b.w. = dc to 1.0mhz 1,2,3 1000 mvp-p output power 4, 8 p out v in = 18, 28, 40v dc. r adj = 940 ohms 1,2,3 30 w line regulation vr line v in = 18, 28, and 40v dc , i out = 5.0, 50, and 100ma 1,2,3 1.0 % load regulation vr load v in = 18, 28, and 40v dc , i out = 5.0, 50, and 100ma 1,2,3 1000 mv input current i in i out = 0, enable (pin 2) tied to input return 1,2,3 18 ma dc i out = 0, enable (pin2) = open 1,2,3 80 ma dc input ripple current i rip i out = 100ma 1,2,3 50 map-p efficiency e ff i out = 100ma, r adj = 940 ohms 1 2,3 80 78 % isolation iso input to output or any pin to case (except pin 2) at 500v dc , tc = 25c 1 100 m ? capacitive load 6, 9 c l no effect on dc performance 4 10 f power dissipation load fault p d overload 3 1 14 w short circuit 1 9.0 w switching frequency f s i out = 100ma 1,2,3 250 300 khz output response to step transient load changes 5 vo tload 50ma load to/from100ma load 4,5,6 -3.0 +3.0 vpk 5.0ma load to/from100ma load 4,5,6 -10 +10 vpk recovery time step transient load changes 1, 5 tt load 50ma load to/from100ma load 4,5,6 2.0 ms 5.0ma load to/from100ma load 4,5,6 5.0 ms
www.irf.com 3 ATW28300S (ir p/n 10207) notes to specifications electrical performance characteristics - continued 1 recovery time is measured from the initiation of the transient to where v out has returned to within 1.0% of v out at 50% load. 2 turn-on delay time measurement is for either a step application of power at the input or the removal of ground signal fr om the enable pin (pin 2) while power is applied to the input. 3 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 a condition of maximum power dissipation. 4 above +125c case, derate output power linearly to 0 to +135c case. 5 transition time 10 s. 6 capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in e xcess of the maximum limit may disturb loop stability and may interfere with the operation of the load fault detection circu itry, appearing as an overload during turn-on. 7 bandwidth guaranteed by design. tested for 20khz to 1.0mhz. 8 parameter guaranteed by line and load regulation tests. 9 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 this table. 10 output voltage can be adjusted to the range of 150v to 300v with an external 1kohms trim pot. the trim pot shall be conne cted to pin 5 (output adjust 1) and pin 6 (output adjust 2). test symbol conditions -55c tc +125c v in = 28v dc 5%, c l = 0 r adj = 455 ohms group a subgroups limits unit unless otherwise specified min max output response transient step line changes 5, 9 vo tline input step 18 to/from 40v dc 4,5,6 -10 +10 vpk recovery time transient step line changes 1, 5, 9 tt line input step 18 to/from 40v dc 4,5,6 2.0 ms turn on overshoot vton os i out = 0 and 100ma, r adj = 940 ohms 4,5,6 20 vpk turn on delay 2 ton d i out = 0 and 100ma, r adj = 940 ohms 4,5,6 350 ms load fault recovery 9 tr lf v in = 18 to 40v dc, r adj = 940 ohms 4,5,6 350 ms weight flange 75 g
4 www.irf.com ATW28300S (ir p/n 10207) pin designation block diagram mechanical outline 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 notes: 1) all dimensions are in inches 2) the tolerance for x.xxx = 0.005 pin # designation pin # designation 1 +input 6 output adjust 2 2 enable 7 case 3 + output 8 n/c 4 output return 9 n/c 5 output adjust 1 10 input return input filter pulse width modulator error amp & reference 1 2 10 3 4 drive 1 drive 2 feedback input enable input return +output output return 6 output adjust 2 5 output adjust 1
www.irf.com 5 ATW28300S (ir p/n 10207) part numbering notes: best commercial practice sample tests at low and high temperatures 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 part definition ir p/n 10207em = ATW28300S/es ir p/n 10207fm = ATW28300S/hb world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 252-7105 ir san jose: 2520junction avenue, san jose, california 95134, tel: (408) 434-5000 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 12/2010 atw 28 300 s /ch model input voltage nominal 28 = 28v output s = single output voltage 300 = 300v screening level (please refer to screening table) no suffix, es, hb, ch
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