www.irf.com 1 hybrid - high reliability dc-dc converter atr28xxd series description features atr 28v input, dual output 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 with screening options. refer to part number section. they can be provided in a standard plug-in package for pc mounting or in a flanged package for more severe environments. manufactured in a facility fully qualified to mil-prf- 38534, these converters are fabricated utilizing dla and land maritime qualified processes. for available screening options, refer to device screening table in the data sheet. variations in electrical, mechanical and screening can be accommodated. extensive computer simulation using complex modeling enables rapid design modification to be provided. contact ir san jose with specific requirements. the atr28xxd 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-704d input requirements, these devices have nominal 28vdc inputs with 12v and 15v dual outputs to satisfy a wide range of requirements. the circuit design incorporates a pulse width modulated single forward topology operating in the feed-forward mode at a nominal switching frequency of 550khz. input to output isolation is achieved through the use of transformers in the forward and feedback circuits. 16v to 40vdc input range (28vdc nominal) 12v and 15v outputs available indefinite short circuit and overload protection 35w/in 3 power density 30w output power fast loop response for superior transient characteristics operating temperature range from -55c to +125c popular industry standard pin-out resistance seam welded case for superior long term hermeticity ceramic feed-thru pins external synchronization high efficiency shutdown from external signal military screening standard microcircuit drawings available pd-94550b
2 www.irf.com atr28xxd series specifications t case = -55c to +85c, v in = +28v 5% unless otherwise specified notes to specifications 1. above +85 c case temperature, derate output power linearly to 0 at +115 c case. 2. recovery time is measured from the initiation of the input transient to where v out has returned to within 1% of v out at 50% load. 3. turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin. 4. load current split equally between +v out and ?v out . 5. up to 90% of full power is available from either output provided. the total power output does not exceed 30w. 6. 3w load on output under test, 3w to 27w on other output. 7. sync. input signal: v il = -0.5v min, 0.8v max and v in = 2.5v min, 11.5v max for 10% to 90% duty cycle. input voltage -0.5v to +50vdc power output internally limited, 36w typical soldering temperature 300c for 10 seconds recommended operating temperature -55c to +85c maximum operating temperature -55c to +115c storage case temperature -65c to +135c absolute maximum ratings temperature range 1 atr2812d atr2815d parameter condition -55 c tc +85 c, v in = 28 v dc 5%, cl=0, unless otherwise specified min typ max min typ max units static characteristics output v in = 16 to 40 v dc voltage i out = 0 to full load 11.76 12 12.24 14.70 15 15.30 v dc current 5 0.0 1.25 0.0 1.0 a dc ripple full load, 20khz to 2mhz 40 85 40 85 mv p-p accuracy t case = 25 c, full load 11.88 12 12.12 14.85 15.00 15.15 v dc power 1 30 30 w regulation line load v in = 16 to 40 v dc i out = 0 to full load 75 120 75 150 mv mv cross regulation 6 v in = 16, 28, and 40 v dc 5 5 % input voltage range current ripple current no load, pin 2 = open inhibited, pin 2 tied to pin 10 full load 16 28 25 40 75 18 50 16 28 25 40 75 18 50 v dc ma dc ma dc ma p-p efficiency full load t c = +25 c 82 82 % isolation input to output @500 v dc 100 100 m ? capacitive load no effect on performance t c = +25 c (total for both outputs) 100 100 f load fault power dissipation short circuit overload, t c = +25 c 9.0 14 9.0 14 w w switching frequency i out = full load 500 600 500 600 khz sync frequency range 7 500 700 500 700 khz dynamic characteristics step load changes output transient recovery 2 50% load to 100% load no load to 50% load 50% load to 100% load no load to 50% load 50% load to no load 100 250 25 500 3.0 100 250 25 500 3.0 mvpk mvpk s s ms step line changes output transient recovery 2 input step 16 to 40 v dc input step 40 to 16 v dc input step 16 to 40 v dc input step 40 to 16 v dc 180 -600 5.0 5.0 180 -600 5.0 5.0 mvpk mvpk ms ms turn-on overshoot delay 3 v in = 16 to 40 v dc i out = o and full load 0.0 14 600 25 0.0 14 600 25 mvpk ms load fault recovery v in = 16 to 40 v dc 14 25 14 25 ms
www.irf.com 3 atr28xxd series t case = -55c to +125c, v in = +28v 5% unless otherwise specified notes to specifications 1. above +125 c case temperature, derate output power linearly to 0 at +135 c case. 2. recovery time is measured from the initiation of the input transient to where v out has returned to within 1% of v out at 50% load. 3. turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin. 4. load current split equally between +v out and ?v out . 5. up to 90% of full power is available from either output provided. the total power output does not exceed 30w. 6. 3w load on output under test, 3w to 27w on other output. 7. sync. input signal: v il = -0.5v min, 0.8v max and v in = 2.5v min, 11.5v max for 10% to 90% duty cycle. specifications input voltage -0.5v to +50vdc power output internally limited, 36w typical soldering temperature 300c for 10 seconds recommended operating temperature -55c to +125c maximum operating temperature -55c to +135c storage case temperature -65c to +135c absolute maximum ratings temperature range 1 atr2812d/es atr2815d/es parameter condition -55 c tc +125 c, v in = 28 v dc 5%, cl=0, unless otherwise specified min typ max min typ max units static characteristics output v in = 16 to 40 v dc voltage i out = 0 to full load 11.76 12 12.24 14.70 15 15 v dc current 5 0.0 1.25 0.0 1.0 a dc ripple full load, 20khz to 2mhz 40 85 40 85 mv p-p accuracy t case = 25 c, full load 11.88 12.00 12.12 14.85 15.00 15.15 v dc power 1 30 30 w regulation line load v in = 16 to 40 v dc i out = 0 to full load 75 120 75 150 mv mv cross regulation 6 v in = 16, 28, and 40 v dc 5 5 % input voltage range current ripple current no load, pin 2 = open inhibited, pin 2 tied to pin 10 full load 16 28 25 40 75 18 50 16 28 25 40 75 18 50 v dc ma dc ma dc ma p-p efficiency full load t c = +25 c 80 82 79 82 % isolation input to output @500 v dc 100 100 m ? capacitive load no effect on performance t c = +25 c (total for both outputs) 100 100 f load fault power dissipation short circuit overload, t c = +25 c 9.0 14 9.0 14 w w switching frequency i out = full load 500 600 500 600 khz sync frequency range 7 500 700 500 700 khz dynamic characteristics step load changes output transient recovery 2 50% load to 100% load no load to 50% load 50% load to 100% load no load to 50% load 50% load to no load 100 250 25 500 3.0 100 250 25 500 3.0 mvpk mvpk s s ms step line changes output transient recovery 2 input step 16 to 40 v dc input step 40 to 16 v dc input step 16 to 40 v dc input step 40 to 16 v dc 180 -600 5.0 5.0 180 -600 5.0 5.0 mvpk mvpk ms ms turn-on overshoot delay 3 v in = 16 to 40 v dc i out = o to full load 0.0 14 600 25 0.0 14 600 25 mvpk ms load fault recovery v in = 16 to 40 v dc 14 25 14 25 ms
4 www.irf.com atr28xxd series t case = -55c to +125c, v in = +28v 5% unless otherwise specified notes to specifications 1. above +125 c case temperature, derate output power linearly to 0 at +135 c case. 2. recovery time is measured from the initiation of the input transient to where v out has returned to within 1% of v out at 50% load. 3. turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin. 4. load current split equally between +v out and ?v out . 5. up to 90% of full power is available from either output provided. the total power output does not exceed 30w. 6. 3w load on output under test, 3w to 27w on other output. 7. sync. input signal: v il = -0.5v min, 0.8v max and v in = 2.5v min, 11.5v max for 10% to 90% duty cycle. specifications input voltage -0.5v to +50vdc power output internally limited, 36w typical soldering temperature 300c for 10 seconds recommended operating temperature -55c to +125c maximum operating temperature -55c to +135c storage case temperature -65c to +135c absolute maximum ratings temperature range 1 atr2812d/hb atr2815d/hb parameter condition -55 c tc +125 c, v in = 28 v dc 5%, cl=0, unless otherwise specified min typ max min typ max units static characteristics output v in = 16 to 40 v dc voltage i out = 0 to full load 11.76 12.00 12.24 14.70 15 15.30 v dc current 5 0.0 1.25 0.0 1.0 a dc ripple full load, 20khz to 2mhz 40 85 40 85 mv p-p accuracy t case = 25 c, full load 11.88 12.00 12.12 14.85 15.00 15.15 v dc power 1 30 30 w regulation line 4 load 4 v in = 16 to 40 v dc i out = 0 to full load 75 120 75 150 mv mv cross regulation 6 v in = 16, 28, and 40 v dc 5 5 % input voltage range current ripple current no load, pin 2 = open inhibited, pin 2 tied to pin 10 full load 16 28 25 40 75 18 50 16 28 18 25 40 75 18 50 v dc ma dc ma dc ma p-p efficiency full load t c = +25 c 80 82 79 82 % isolation input to output @500 v dc 100 100 m ? capacitive load no effect on performance t c = +25 c (total for both outputs) 100 100 f load fault power dissipation short circuit overload, t c = +25 c 9.0 14 9.0 14 w w switching frequency i out = full load 500 600 500 600 khz sync frequency range 7 500 700 500 700 khz dynamic characteristics step load changes output 4 transient recovery 2 50% load to 100% load no load to 50% load 50% load to 100% load no load to 50% load 50% load to no load 100 250 25 500 3.0 450 760 70 1500 5.0 100 250 25 500 3.0 450 750 70 1500 5.0 mvpk mvpk s s ms step line changes output transient recovery 2 input step 16 to 40 v dc input step 40 to 16 v dc input step 16 to 40 v dc input step 40 to 16 v dc 180 -600 5.0 5.0 1200 -1500 10 10 180 -600 5.0 5.0 1500 -1500 10 10 mvpk mvpk ms ms turn-on overshoot delay 3 v in = 16 to 40 v dc i out = o to full load 0.0 14 600 25 0.0 14 600 25 mvpk ms load fault recovery v in = 16 to 40 v dc 14 25 14 25 ms
www.irf.com 5 atr28xxd series t case = -55c to +125c, v in = +28v 5% unless otherwise specified specifications notes to specifications 1. above +125 c case temperature, derate output power linearly to 0 at +135 c case. 2. recovery time is measured from the initiation of the input transient to where v out has returned to within 1% of v out at 50% load. 3. turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin. 4. load current split equally between +v out and ?v out . 5. up to 90% of full power is available from either output provided. the total power output does not exceed 30w. 6. 3w load on output under test, 3w to 27w on other output. 7. sync. input signal: v il = -0.5v min, 0.8v max and v in = 2.5v min, 11.5v max for 10% to 90% duty cycle. input voltage -0.5v to +50vdc power output internally limited, 36w typical soldering temperature 300c for 10 seconds recommended operating temperature -55c to +125c maximum operating temperature -55c to +135c storage case temperature -65c to +135c absolute maximum ratings temperature range 1 atr2812d/ch atr2815d/ch parameter condition -55 c tc +125 c, v in = 28 v dc 5%, cl=0, unless otherwise specified min typ max min typ max units static characteristics output v in = 16 to 40 v dc voltage i out = 0 to full load 11.76 12.00 12.24 14.70 15 15.30 v dc current 5 0.0 1.25 0.0 1.0 a dc ripple full load, 20khz to 2mhz 40 85 40 85 mv p-p accuracy t case = 25 c, full load 11.88 12.00 12.12 14.85 15.00 15.15 v dc power 1 30 30 w regulation line 4 load 4 v in = 16 to 40 v dc i out = 0 to full load 75 120 75 150 mv mv cross regulation 6 v in = 16, 28, and 40 v dc 5 5 % input voltage range current ripple current no load, pin 2 = open inhibited, pin 2 tied to pin 10 full load 16 28 25 40 75 18 50 16 28 18 25 40 75 18 50 v dc ma dc ma dc ma p-p efficiency full load t c = +25 c 80 82 79 82 % isolation input to output @500 v dc 100 100 m ? capacitive load no effect on performance t c = +25 c (total for both outputs) 100 100 f load fault power dissipation short circuit overload, t c = +25 c 9.0 14 9.0 14 w w switching frequency i out = full load 500 600 500 600 khz sync frequency range 7 500 700 500 700 khz dynamic characteristics step load changes output 4 transient recovery 2 50% load to 100% load no load to 50% load 50% load to 100% load no load to 50% load 50% load to no load 100 250 25 500 3.0 450 760 70 1500 5.0 100 250 25 500 3.0 450 750 70 1500 5.0 mvpk mvpk s s ms step line changes output transient recovery 2 input step 16 to 40 v dc input step 40 to 16 v dc input step 16 to 40 v dc input step 40 to 16 v dc 180 -600 5.0 5.0 1200 -1500 10 10 180 -600 5.0 5.0 1500 -1500 10 10 mvpk mvpk ms ms turn-on overshoot delay 3 v in = 16 to 40 v dc i out = 0 to full load 0.0 14 600 25 0.0 14 600 25 mvpk ms load fault recovery v in = 16 to 40 v dc 14 25 14 25 ms
6 www.irf.com atr28xxd 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 circuit voltage of the inhibit input is 11.5 1.0vdc. assuming that there is no forced air flow, the package temperature rise above ambient ( ? t) may be calculated using the following expression: where a = the effective surface area in square inhes (in-cluding heat sink if used), p d = power dissipation in watts. the total surface area of the atr standard package is 7.34 square inches. if a worse case full load efficiency of 78% is assumed, then the case temperature rise can be calculated as follows: hence, if t ambient = +25 c, the dc/dc converter case temperature will be approximately 147 c if no heat sink or air flow is provided. block diagram application information inhibit function thermal management ? = 80 a ?0.7 p d 0.85 ( c) (1) w eff p p out d 5 8 1 78 1 30 1 1 . = ? ? ? ? ? ? ? = ? ? ? ? ? ? ? = and ? = 80 ( 7.34 ) ?0.7 ( 8.5 ) 0.85 = 122 c to calculate the heat sink area required to maintain a specific case temperature rise, equation (1) may be manipulated as follows: pkg d heatsink a p t a ? ? ? ? ? ? ? ? ? ? = ? 43 1 85 0 80 . . as an example, if it is desired to limit the case temperature rise to a maximum of 50 c above ambient, the required effective heat sink area is: 2 43 1 85 0 1 19 34 7 5 8 80 50 in a heatsink . . ) . ( . . = ? ? ? ? ? ? ? = ? emi filter an emi filter (afc461), available as an option, will reduce the input ripple current to levels below the limits imposed by mil-std-461b ceo3. whenever multiple dc/dc converters are utilized in a single system, significant low frequency noise may be generated due to slight difference 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). the international rectifier atr28xx converters provide a synchronizing input permitting synchronization of multiple converters to the frequency of the users system clock, thereby minimizing this type of noise. device synchronization 3 4 +vout output return pulse width modulator primary housekeeping supply emi filter 1 2 9 10 +input inhibit input sync input return fb cs drive 5 -vout 8 case error amp & ref regulator
www.irf.com 7 atr28xxd series pin designation mechanical outlines pin # designation 1 + input 2 inhibit input 3 + output 4 output return 5 - output 6nc 7nc 8 case ground 9 sync. 10 input return standard microcircuit drawing equivalence table standard microcircuit vendor cage ir standard drawing number code part number 5962-94627 52467 atr2812d 5962-94628 52467 atr2815d
8 www.irf.com atr28xxd series 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 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. 07/2011 atr 28 15 d f /ch model input voltage nominal 28 = 28v output voltage 12 = 12v 15 = 15v output d = dual screening level package style f = flange blank = non - flanged (please refer to screening table) no suffix, es, hb, ch
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