www.irf.com 1 high reliability dc-dc converter ats series description 16v to 50v dc input range input transient per mil-std-704d up to 25w output power single and dual output models include 3.3v, 5v, 12v, 15v, 5v, 12v and 15v internal emi filter; converter capable of meeting mil-std-461c ce03 and cs01 magnetically coupled feedback high efficiency - to 82% -55c to +125c operating temperature range 100m ? @ 500vdc isolation under-voltage lockout short circuit and overload protection output over voltage limiter adjustable output voltage external inhibit 1,000,000 hour mtbf low weight, < 85 grams features 28v input, single/dual output manufactured in a facility fully qualified to mil-prf- 38534, these converters are fabricated utilizing dla land and maritime qualified processes. for available screening options, refer to device screening table in the data sheet. applications the ats series dc-dc converters are a family of 25w, single and dual output, high reliability devices designed for rugged environments and extended temperature operations such as those encountered in military, aerospace and industrial applications. the converters are in full compliant with ce03 and cs01 of mil-std- 461c. features include small size, low weight and conservative component stress de-rating. for operations in radiation environments, the m3l series with the identical form factor and electrical rating is recommended. all models include an external inhibit port and have an adjustable output voltage. they are enclosed in a hermetic 1.5" x 2.3" x .425" steel package and weight less than 85grams. the package utilizes rugged ceramic feed-thru copper core pins and is sealed using parallel seam welding. ats military aircraft commercial aircraft missiles ground equipment pd-97221b
2 www.irf.com ats series (28v input, single/dual output) the ats series converters utilize a single-ended forward topology with resonant reset. the nominal switching frequency is 500khz. electrical isolation and tight output regulation are achieved through the use of a magnetically coupled feedback. voltage feed-forward with duty factor limiting provides high line rejection and protection against output over voltage in the event of an internal control loop failure. this mechanism limits the maximum output voltage to approximately 20% over the nominal regardless of the line voltage. circuit description an internal emi filter allows the converter to meet the conducted emissions requirements of mil-std- 461c on the input power leads. a single-stage output filter reduces the typical output ripple to less than 50mv peak-to-peak. output current is limited under any load fault condition to approximately 125% of rated. an overload condition causes the converter output to behave like a constant current source with the output voltage dropping below nominal. the converter will resume normal operation when the load current is reduced below the current limit point. this protects the converter from both overload and short circuit conditions. the current limit point exhibits a slightly negative temperature coefficient to reduce the possibility of thermal runaway. an external inhibit port is provided to control converter operation. the converter?s operation is inhibited when this pin is pulled low. it is designed to be driven by an open collector logic device. the pin may be left open for normal operation and has a nominal open circuit voltage of 10.5v with respect to the input return (pin 2). the output voltage of all models can be adjusted using a single external resistor.
www.irf.com 3 ats series (28v input, single/dual output) 1 meets derating per mil-std-975 2 for operation at +125c see table note 13 electrical performance characteristics for notes to electrical performance characteristics table, refer to page 5 limits parameter group a subgroup conditions -55 c t c +85 c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit input voltage 16 28 50 v output voltage ( vout ) ats2803r3s ats2805s ats2812s ats2815s ats2805d ats2812d ats2815d ats2803r3s ats2805s ats2812s ats2815s ats2805d ats2812d ats2815d 1 1 1 1 1 1 1 2,3 2,3 2,3 2,3 2,3 2,3 2,3 i out = 100% rated load note 4 i out = 100% rated load note 4 3.27 4.95 11.88 14.85 4.95 11.88 14.85 3.23 4.90 11.76 14.70 4.90 11.76 14.70 3.30 5.00 12.00 15.00 5.00 12.00 15.00 3.33 5.05 12.12 15.15 5.05 12.12 15.15 3.37 5.10 12.24 15.30 5.10 12.24 15.30 v v output power ( p out ) ats2803r3s all others 1,2,3 v in = 16, 28, 50 volts, note 2 0 0 20 25 w output current ( i out ) ats2803r3s ats2805s ats2812s ats2815s ats2805d ats2812d ats2815d 1,2,3 v in = 16, 28, 50 volts, note 2 either output, note 3 either output, note 3 either output, note 3 0 0 0 0 0 0 0 6.06 5.00 2.08 1.67 4.00 1.67 1.33 a line regulation ( vr line ) 1,2,3 v in = 16, 28, 50 volts i out = 0, 50%, 100% rated, note 4 -0.5 0.5 % load regulation ( vr load ) 1,2,3 i out = 0, 50%, 100% rated, note 4 v in = 16, 28, 50 volts -1.0 1.0 % cross regulation ( vr cross ) ats2805d ats2812d ats2815d 1,2,3 v in = 16, 28, 50 volts duals only, note 5 -5.0 -3.0 -3.0 5.0 3.0 3.0 % input voltage range -0.5vdc to +75vdc input voltage range +16vdc to +50vdc output power internally limited in p ut volta g e ran g e 1 +16vdc to +38vdc lead temperature +300c for 10 seconds output power 0 to max. rated operating case temperature -55c to +125c o p eratin g tem p erature 2 -55c to +125c storage temperature -55c to +135c o p eratin g tem p erature 1 -55c to +70c recommended operating conditions absolute maximum ratings
4 www.irf.com ats series (28v input, single/dual output) electrical performance characteristics ( continued ) for notes to electrical performance characteristics table, refer to page 5 limits parameter group a subgroup conditions -55 c t c +85 c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit input current, no load ( i in ) ats2803r3s ats2805s ats2812s ats2815s ats2805d ats2812d ats2815d 1,2,3 i out = 0, pin 4 open 60 70 70 70 70 100 100 ma input current inhibited 1,2,3 pin 4 shorted to pin 2 8.0 ma output ripple ( v rip ) ats2803r3s ats2805s ats2812s ats2815s ats2805d ats2812d ats2815d 1,2,3 v in = 16, 28, 50 volts i out = 100% rated load notes 4, 6 35 50 70 80 80 80 80 mv p-p switching frequency ( f s ) 1,2,3 sync. input (pin 4) open 425 500 575 khz efficiency ( e ff ) ats2803r3s ats2805s ats2812s ats2815s ats2805d ats2812d ats2815d 1,2,3 i out = 100% rated load note 4 68 75 75 75 75 75 75 75 79 80 81 79 79 80 % enable input ( inhibit function ) open circuit voltage drive current ( sink ) voltage range 1,2,3 note 1 9.5 -0.5 11.5 500 50 v a v current limit point expressed as a percentage of full rated load current 1,2,3 v out = 90% of nominal, note 4 105 130 % power dissipation, load fault (p d ) 1,2,3 short circuit, overload, note 8 14 w output response to step load changes (v tld ) 4,5,6 half load to/from full load, notes 4,9 -300 300 mv pk recovery time, step load changes (t tld ) 4,5,6 half load to/from full load, note 4,9,10 200 s output response to step line changes (v tln ) 4,5,6 16v to/from 50v i out = 100% rated load, notes 1,4,11 -300 300 mv pk recovery time, step line changes (t tln ) 4,5,6 16v to/from 50v i out = 100% rated load, notes 1,4,10,11 200 s turn-on response overshoot (v os ) turn-on delay (t dly ) 4,5,6 no load, full load notes 4,12 2.0 500 10 mv ms
www.irf.com 5 ats series (28v input, single/dual output) electrical performance characteristics (continued) notes for electrical performance characteristics table 1. parameter is tested as part of design characterization or after design changes. thereafter, parameter shall be guaranteed to the limits specified. 2. parameter verified during line and load regulation tests. 3. output load current must be distributed such that at least 20% of the total load current is being provided by one of the outputs. 4. load current split equally between outputs on dual output models. 5. cross regulation is measured with 20% rated load on output under test while changing the load on the other output from 20% to 80% of rated. 6. guaranteed for a d.c. to 20mhz bandwidth. tested using a 20khz to 10mhz bandwidth using the circuit on page 6. 7. 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 may interfere with the proper operation of the converter?s overload protection, causing erratic behavior during turn-on. 8. overload power dissipation is defined as the device power dissipation with the load set such that v out = 90% of nominal. 9. load step transition time 10 s. 10. recovery time is measured from the initiation of the transient to where v out has returned to within 1.0% of its steady state value. 11. line step transition time 100 s. 12. turn-on delay time from either a step application of input power or a logic low to a logic high transition on the inhibit pin (pin 4) to the point where v out = 90% of nominal. 13. for operation at temperatures between +85 c and +125 c, derate the maximum input voltage linearly from 100% to 75%. limits parameter group a subgroup conditions -55 c t c +85 c v in = 28v dc 5%, c l = 0 unless otherwise specified min nom max unit capacitive load (cl) ats2803r3s ats2805s ats2812s ats2815s ats2805d ats2812d ats2815d 1 i out = 100% rated load no effect on dc performance notes 1, 4, 7 each output on duals 2200 1000 180 120 500 90 60 f line rejection 1 i out = 100% rated load dc to 50khz, notes 1, 4 40 50 db isolation 1 input to output or any pin to case except pin 3, test @ 500vdc 100 m ? device weight 85 g mtbf mil-hdbk-217f2, gm, 35 c 1.0 x10 6 hr
6 www.irf.com ats series (28v input, single/dual output) circuit for measuring output ripple voltage + vout return dut r l for i rated 0.1 f 50 ? coax 50 ? oscilloscope or equivalent with 10 mhz bandwidth, multiply readings by 2. 1 f 50 ? termination
www.irf.com 7 ats series (28v input, single/dual output) figure 1. conducted emissions, normal mode figure 2. conducted emissions, common mode 0 10 20 30 40 50 60 70 80 90 100 db-ua 1e3 1e4 1e5 1e6 1e7 1e8 frequency ( hz ) ceo3 limit 0 10 20 30 40 50 60 70 80 90 100 db-ua 1e3 1e4 1e5 1e6 1e7 1e8 frequency ( hz ) ceo3 limit
8 www.irf.com ats series (28v input, single/dual output) figure 3. block diagram - single output figure 4. block diagram - dual output 1 4 2 5 7 vin inhibit return +output output adjust 3 case ground + - bias supply emi filter +10.5v sample & hold feedback trigger ea 6 output return ramp gen. pwm controller 7 8 +output return + - ea 6 -output 1 4 2 vin inhibit return 3 case ground bias supply emi filter +10.5v sample & hold feedback trigger ramp gen. pwm controller 5 output adjust
www.irf.com 9 ats series (28v input, single/dual output) mechanical outline pin designation (single/dual) pin # single dual 1 + input + input 2 input return input return 3 case case 4 inhibit inhibit 5 output adjust output adjust 6 output return - vout 7 + vout output return 8 nc + vout pin ? 0.040 ? 0.128 4 plcs 2.300 1.55 0.375 0.85 0.35 1.50 1.75 2.000 2.80 ref 0.425 max 0.050 0.47 14 23 0.40 2 eq spaces @ 0.20 5 8 7 6 0.27 1.00 ref 0.40 0.40 0.20 tolerance: .xx = 0.01 .xxx = 0.005 0.220 0.25 typ. 0.250 0.02
10 www.irf.com ats series (28v input, single/dual output) part numbering notes: best commercial practice sample tests at low and high temperatures world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 252-7105 ir san jose: 2520 junction 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. 11/2012 device screening requirement mil-std-883 method no suffix es hb ch temperature range -20c to +85c -55c to +85c -55c to +85c -55c to +85c 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 +85c +85c 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 ats 28 05 s /ch model input voltage 28 = 28v output voltage single: 03r3 = 3.3v, 05 = 5v 12 = 12v, 15 = 15v dual: 05 = 5v, 12 = 12v 15 = 15v output s = single d = dual screening level (please refer to screening table) no suffix, es, hb, ch
|
