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1 models vdc o utput single 3.3 5 1215 dual ? ?2 ?5 dc/dc c onverters 28 v olt i nput smtr series 30 watt description the smtr series of 28 volt dc/dc converters offers up to 30 watts of output power from single or dual output configurations. the operate over the full military temperature range of ?5 c to +125? with up to 84% efficiency. smtr converters are packaged in hermetically sealed metal enclosures, making them ideal for use in military, aerospace and other high reliability applications. s creening and r eports smtr converters of fer three screening options (standard, class h, or class k) and two levels of radiation hardness (o or r). see t ables 1, 2, and 3 for more information. detailed reports on product performance are also available and are listed in table 4. c onverter d esign the smtr converters are constant frequency, pulse-width mod- ulated switching regulators which use a quasi-square wave, single ended, forward converter design. tight load regulation is maintained by using a wide bandwidth magnetic feedback and, on single output models, through use of remote sense. on dual output models, the positive output is independently regulated and the negative output iscross regulated through the use of tightly coupled magnetics. indefinite short circuit protection and overload protection are provided by a constant current-limit feature. this protective system senses current in the converter s secondary stage and limits it to approximately 115% of the maximum rated output current. smtr converters are provided with internal filtering capacitors that help reduce the need for external components in normal operation.for systems that require compliance with mil-std-461c s ce03 standard, interpoint offers filter/transient suppression modules (including the fmc-461, fmd-461 and fm-704a series filters) which will result in compliance. for the lowest noise performance, connec- tion of the case to input common is recommended. the connection can be hard-wired or ac coupled with a small ceramic bypass capacitor. s ynchronization synchronizing the converter with the system clock allows the designer to confine switching noise to clock transitions, minimizinginterference and reducing the need for filtering. in sync mode, the converter will run at any frequency between 500 khz and 675 khz. the sync control operates with a quasi-ttl signal at any duty cycle between 40% and 60%. the sync pin should be connected to input common pin when not in use. w ide v oltage r ange smtr converters are designed to provide full power operation over a full 16 to 40 vdc voltage range. operation below 16 volts, including mil-std-704d emergency power conditions is possible with derated power. i mproved d ynamic r esponse the smtr series feed-forward compensation system provides excellent dynamic response and noise rejection. audio rejection is typically 50 db. the min. to max. step line transient response is typi- cally less than 4%. i nhibit f unction smtr converters provide an inhibit terminal that can be used to disable internal switching, resulting in no output and very low quiescent input current. the converter is inhibited when a ttl compatible low ( 0.8v) is applied to the inhibit pin. the unit is enabled when the pin, which is internally connected to a pull-up resistor, is left unconnected or is connected to an open-collector gate. the open circuit output voltage associated with the inhibit pin is 9 to 1 1 vdc. in the inhibit mode, a maximum of 8 ma must be sunk from the inhibit pin. size (max.): non-flanged case: h2 2.125 x 1.125 x 0.400 inches (53.98 x 28.58 x 10.16 mm) flanged case: k3 2.910 x 1.125 x 0.400 inches (73.79 x 28.58 x 10.16 mm)see figures 22 through 25 for dimensions. weight: non-flanged 52 grams max., flanged 55 grams max. screening: space prototype, class h, or class k (mil-prf-38534) radiation hardness levels o or r f eatures fully qualified to class h or k radiation hardened ?5 to +125? operation 16 to 40 vdc input fully isolated magnetic feedback fixed frequency, 600 khz typical topology ?single ended forward inhibit function sync function indefinite short circuit protection up to 30 watts output power trim function on single output models up to 81% efficiency ?
typical characteristics sync and inhibit recommended opera ting conditions absolute maximum ratings input voltage 16 to 40 vdc output power 25 to 30 watts depending on model lead soldering temperature (10 sec per pin) 300? storage t emperature range (case) ?5? to +135? 2 smtr series 30 watt dc/dc c onverters output voltage temperature coefficient 100 ppm/? typical single and dual outputs 200 ppm/? main, 300 ppm/c aux triple output input to output capacitance 50 pf typ (100 pf typ triple outputs) current limit 115% of full load typical isolation 100 megohm minimum at 500 v audio rejection 40 db typ (50 db typ triple output)l conversion frequency free run 550 min, 600 typ, 650 max khz external sync 500 to 675 khz inhibit pin voltage (unit enabled) 9 to 11 v input voltage range 16 to 40 vdc continuous 50 v for 50 msec transient case operating temperature (tc) ?5? to +125c full power ?5? to +135? absolute derating output power/current linearly from 100% at 125? to 0% at 135? sync (500 to 675 khz) duty cycle 40% min, 60% max logic low 0.8 v max logic high 4.5 v min, 5 v max referenced to input common if not used, connect to input common inhibit ttl open collector logic low (output disabled) voltage 0.8 v inhibit pin current 8.0 ma max referenced to input common logic high (output enabled) open collector notes 1. tc = ?5c to +125c 2. operation is limited below 16v (see figure 21). 3. tested with 3300 pf ceramic bypass capacitors connected externally from input common to case and output common to case. 4. indefinite short circuit protection not guaranteed above 125? case. 5. recovery time is measured from application of the transient to point at which vout is within 1% of final value. 6. transition time 10 ?. electrical characteristics: 25 ? tc, 28 vdc vin, 100% load, radiation level o, unless otherwise specified. single output models smtr283r3s smtr2805s smtr2812s smtr2815s parameter condition min typ max min typ max min typ max min typ max units output voltage 3.27 3.30 3.33 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 vdc output current 1 v in = 16 to 40 vdc 0 5.45 0 5.0 0 2.5 0 2.0 a output power 1 v in = 16 to 40 vdc 0 18 0 25 0 30 0 30 w output ripple 10 khz ?2 mhz 15 40 35 40 25 40 25 40 mv p-p voltage tc = ?5? to +125? 50 50 90 40 90 40 90 line regulation 2 vin = 16 to 40 vdc tc = ?5? to +125? 20 15 50 15 50 15 50 mv load regulation no load to full tc = ?5? to +125? 20 15 50 15 50 15 50 mv input vol t age 1 continuous 16 28 40 16 28 40 16 28 40 16 28 40 vdc no load t o full transient 50 ms ?0?0?0?0 v input current 1 no load 30 75 35 75 35 75 35 75 ma full load 0.94 1.15 1.30 1.25 a inhibited 7 8 3 8 3 8 3 8 ma input ripple 10 khz ?10 mhz current 3 tc = ?5? to +125? 25 50 20 50 20 50 20 50 ma p-p efficiency 74 76 74 78 78 83 79 84 % load fault 4 short circuit power dissipation 10 10 10 10 w recovery 1, 5 1.4 6 1.4 5 1.4 5 1.4 5 ms step load resp . 50% ?100% ?50% transient 125 ?50 ?00 ?00 ?50 ?00 ?50 ?00 mv pk recover y 5 200 60 200 60 200 60 200 ? step line resp. 16 ?40 ?16 vdc transient 6 300 ?00 ?00 ?00 ?00 ?00 ?00 mv pk recovery 5 300 300 300 300 ? start-up 1 delay 1.4 5 1.4 5 1.4 5 1.4 5 ms overshoot full load 0 50 0 50 0 120 0 150 mv pk no load 33 150 50 250 120 600 150 750 ?
dual output models smtr2805d smtr2812d smtr2815d parameter conditions min typ max min typ max min typ max units output voltage +v out 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 vdc ? out 4.92 5.00 5.08 11.82 12.00 12.18 14.77 15.00 15.23 output current 1, 2 v in = 16 to 40 vdc 0 2.5 4.5 0 1.25 2.25 0 1.0 1.8 a output power 1, 2 v in = 16 to 40 vdc 0 25 0 30 0 30 w output ripple 10 khz - 2 mhz 20 50 30 80 25 80 mv p-p voltage +/?v out tc = ?5? to +125? 40 80 40 120 40 120 line regulation 3 tc = ?5? +v out 10 50 10 50 10 50 mv v in = 16 to 40 vdc to +125? ? out 50 100 50 150 50 180 load regula tion tc = ?5? +v out 5 50 15 50 15 50 mv no load to full to +125? ? out 25 100 30 180 30 180 cross regulation see note 4 7 12 4 8.3 3 8 % effect on ? out see note 5 4 6 4 6 4 6 input voltage 1 continuous 16 28 40 16 28 40 16 28 40 vdc no load to full transient 50 ms 0 50 0 50 0 50 v input current no load 35 75 50 75 50 75 ma full load 1.10 1.34 1.29 a inhibited 3 8 3 8 3 8 ma input ripple current 1, 6 10 khz - 10 mhz 15 50 20 50 20 50 ma p-p efficiency 74 76 77 80 78 81 ? load fault 7 power dissipation short circuit 1 10 10 10 w recover y 1.4 5.0 1.4 5.0 1.4 5.0 ms step load 50 ?100 ?50% balanced response v out transient ?00 ?00 150 ?00 ?00 ?00 mv pk recover y 8 100 200 100 200 100 200 s step line 16 ?40 ?16 v in response ? out transient 9 ?00 ?00 ?00 ?00 ?00 ?00 mv pk recovery 8 300 300 300 ? start?p 1 delay 1.4 5 1.4 5 1.4 5 ms overshoot full load 0 180 0 120 0 150 mv pk no load 50 250 120 600 150 750 3 smtr series 30 watt dc/dc c onverters notes 1. tc = ?5c to +125c. 2. up to 90% of the total output current/power is available from either output providing the positive output is carrying at least 10% of the total output power . 3. operation is limited below 16 v (see figure 21). 4. effect on the negative output under the following conditions: +p out 20% to 80%; ? out 80% to 20% 5. effect on the negative output under the following conditions: +p out 50%; ? out 10% to 50% 6. t ested with 3300 pf ceramic bypass capacitors connected externally from input common to case and output common to case 7. indefinite short circuit protection not guaranteed above 125? case. 8. recovery time is measured from application of the transient to point at which v out is within 1% of final value. 9. transition time 10 ?. electrical characteristics: 25? tc, 28 vdc vin, 100% load, radiation level o, unless otherwise specified. ?
trim and remote sense (available on single output models only) 4 smtr series 30 watt dc/dc c onverters pin out f igure 3: p in o ut s ingle o utput m odels pin single output dual output 1 positive input positive input 2 inhibit inhibit 3 sense return positive output 4 output common output common 5 positive output negative output 6 positive sense case ground 7 case ground case ground 8 case ground case ground 9 sync sync 10 input common input common f igure 4: p in o ut d ual o utput m odels see figures 22 and 23 and for dimensions. see figures 24 and 25 for dimensions. f igure 2: r emote s ense 2, 3 f igure 1: t rim c onnection 1, 2, 3 notes for remote sense and trim 1. when trimming output voltage and/or remote sensing, the total output voltage increase must be less than 0.6 volts at the converters pins tomaintain specified performance. 2. if neither voltage trim nor remote sense will be used, connect pin 3 to pin 4 and pin 5 to pin 6 or the output voltage will increase by 1.2 volts. 3. caution: the converter will be permanently damaged if the positive remote sense (pin 6) is shorted to ground. damage may also result if the output common or positive output is disconnected from the load withthe remote sense leads connected to the load. trim formulas vout = desired output voltage; rt = trim resistor 3.3v: rt = 1300 * vout ?4304 1.2475 5v: rt = 1300 * vout ?6512 1.2475 12v : rt = 1300 * v out ?15631 1.2475 15v: rt = 1300 * vout ?19498 1.2475 bottom view smtr single flanged and non-flanged dot on top of cover indicates pin one. dotted line outlines flanged package option. 6 10 7 8 9 12 345 r l output common r emote sense connection 2 m ake connections at l oad. smtr single output converter 4 3 5 10 1 +v in input common 6 sense return sense positive output 2 2 external trim connection 1 make connections at converter. r l output common smtr single output converter 4 3 5 10 1 +v in in put common 6 sense return sense p ositive output 1 r t 1 bottom view smtr dual flanged and non-flanged dot on top of cover indicates pin one. 6 10 7 8 9 12 345 dotted line outlines flanged package option. ?
5 smtr series 30 watt dc/dc c onverters typical performance curves: 25? tc, 28 vdc vin, 100% load, free run, unless otherwise specified. f igure 8 f igure 10 f igure 5 f igure 6 f igure 9 f igure 7 model numbering key smd numbers s t andard m icrocircuit d rawing (smd) 5962-0150102hxc 5962-9306802hxc 5962-9306902hxc5962-9307002hxc in process in process in process mtr s eries s imilar p art smtr283r3s/ho smtr2805s/ho smtr2812s/hosmtr2815s/ho smtr2805d/ho smtr2812d/hosmtr2815d/ho to indicate the flanged case option change the ??to ??in the smd number . the smd number shown is for class h screening, non-flanged, and no radiation hardness assurance (rha) level. see the smd for the numbers for other screening and radiation levels. for exact specifications for an smd product, refer to the smd drawing. call your interpoint repre- sentative for status on the smtr smd releases which are ?n process.?smds can be downloaded from http://www.dscc.dla.mil/programs/smcr ? output power (watts) smtr2812d efficiency e f f i c i e n c y ( % ) 60 85 80 75 70 65 5 10 15 20 16v 40v 28v 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 frequency (khz) audio rejection, smtr series a t t e n u a t i o n ( d b ) output power (watts) smtr2805s efficiency e f f i c i e n c y ( % ) 60 85 80 75 70 65 5 10 15 20 25 16v 40v 2 8v output power (watts) smtr2812s efficiency e f f i c i e n c y ( % ) 60 85 80 75 70 65 5 16v 2 8v 40v 10 15 20 output power (watts) smtr2815d efficiency e f f i c i e n c y ( % ) 65 90 85 80 75 70 5 10 15 20 40v 28v 16v output power (watts) smtr2815s efficiency e f f i c i e n c y ( % ) 62 8 7 82 77 72 67 5 1 6v 28v 4 0v 10 15 20 25 smtr 28 05 s f / k r base model input voltage output voltage screening number of outputs ( s = single, d = dual) r adiation level c ase option ( non-flanged case has no designator in this position)
6 smtr series 30 watt dc/dc c onverters dc/dc c onverters typical performance curves: 25? tc, 28 vdc vin, 100% load, free run, unless otherwise specified. f igure 20 f igure 17 f igure 18 f igure 21 f igure 19 f igure 14 f igure 16 f igure 11 f igure 12 f igure 15 f igure 13 50s/div 16 to 40v smtr2805s step line response 2 0 m v / d i v 2 0 v / d i v v in v out 50 s/div 50% 100% s mtr2805s step load response 1 0 0 m v / d i v 25w to 12.5w 12.5w to 25w 50 s/div 16 to 40 smtr2815d step line response 2 0 m v / d i v 2 0 v / d i v v in +v out ? o ut 50 s/div 10% 100% smtr2805s step load response 2 0 0 m v / d i v 2 5w to 2.5w 2.5w to 25w ? output load (%) cond. b: 50% load +v, 50% to 10% C cond. a: 50% load C, 50% to 10% +v cross regulation C v out voltage c h ange (%) C 0 8 10 20 30 40 50 C C C C C C C 1 2 34 5 6 7 cond a cond b 2812d 2812d 2815d 2805d 2805d 50 s/div 10% 100% smtr2815d +v out step load response 1 0 0 m v / d i v 3w to 15w 15w to 3w 200 s/div smtr2815d turn-on into no load 5 v / d i v 2 0 v / d i v v in +v out ? o ut output power (watts) 1% drop smtr singles and duals low line dropout i n p u t v o l t a g e ( v o l t s ) 13.0 13.5 14.0 14.5 15.0 15.5 16.0 9 12 15 18 21 24 27 30 3 27 6 24 9 21 12 18 15 15 18 12 21 9 24 6 27 3 30 0 +p out ? out 0 30 output load (watts) 10% to 90% load +v 90% to 10% load ? cross regulation v o u t v o l t a g e c h a n g e ( % ) 1 0 9 8 7 65 4 32 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 2812d 2815d 2815d 2812d 2805d 2805d 1 v / d i v 2 0 v / d i v 500 s / div smtr2805s turn-on into no load v in v out 50 s/div 25% 50% smtr2815d +v out step load response 1 0 0 m v / d i v ? o ut =15w 7.5w to 15w 15w to 7.5w
7 smtr series 30 watt dc/dc c onverters f igure 22: c ase h m aximum d imensions f igure 23: c ase h2 note: although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. please refer to the numerical dimensions for accuracy . ? c ase h b ottom view see figure 23 for pin configurations. 2.125 max ( 53.98) 1 .125 max (28.58) m aterials h eader cold rolled steel/nickel/gold case h2 cold rolled steel/nickel/tin case h4 c over kovar/nickel case h2 cold rolled steel/nickel/tin case h4 pins #52 alloy ceramic seal case h1 compression glass seal case h4 case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.3) for two decimal places unless otherwise specified caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300 c for 10 seconds per pin. dot on top of case indicates pin one 0.155 (3.94) 0.955 (24.26) 0.155 (3.94) 0.955 (24.26) 6 10 7 8 9 platform seam seal 0 . 0 0 0 0.040 dia (1.02) 0.000 0 . 0 0 0 0 . 4 0 0 m a x . ( 1 0 . 1 6 ) 0 . 2 5 ( 6 . 4 ) 0 . 2 4 5 ( 6 . 2 2 ) 1 . 8 4 5 ( 4 6 . 8 6 ) 2 . 0 9 0 ( 5 3 . 0 1 ) 1.110 (28.19) 12 6 10 smtr series single smtr series dual bottom view case h2 345 7 8 9 0 . 0 0 0 0.000 0 . 2 4 5 ( 6 . 2 2 ) 1 . 8 4 5 ( 4 6 . 8 6 ) 2 . 0 9 0 ( 5 3 . 0 1 ) 1.110 (28.19) 12 345 0 . 6 4 5 ( 1 6 . 3 8 ) 1 . 0 4 5 ( 2 6 . 5 4 ) 1 . 4 4 5 ( 3 6 . 7 0 ) 0 . 6 4 5 ( 1 6 . 3 8 ) 1 . 0 4 5 ( 2 6 . 5 4 ) 1 . 4 4 5 ( 3 6 . 7 0 ) squared corner and dot on top of case indicate pin one. squared corner and dot on top of case indicate pin one. smtr series single smtr series dual
8 smtr series 30 watt dc/dc c onverters f igure 24: c ase k m aximum d imensions ? materials header case k3 cold rolled steel/nickel/gold case k8 cold rolled steel/nickel/tin cover case k3 kovar/nickel case k8 cold rolled steel/nickel/tin pins #52 alloy (all cases) case k3 ceramic seal case k8 compression glass seal case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.2) for two decimal places unless otherwise specified case k bottom view s ee figures 40 and 41 f or pin configuration caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300 c for 10 seconds per pin. flange thickness: case k3 0.060 (1.52) case k5 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) 1 .125 max (28.58) 2.910 max (73.91) d ot on top of case indicates pin one
9 smtr series 30 watt dc/dc c onverters f igure 25: c ase k3 ? 0.155 (3.94) 0.955 (24.26) 6 1 0 7 8 9 0 . 0 0 0 0 . 4 0 0 m a x . ( 1 0 . 1 6 ) 0 . 2 5 0 . 0 3 ( 6 . 4 0 . 8 ) 0.040 dia (1.02) 0 . 0 0 0 0 . 4 0 0 m a x . ( 1 0 . 1 6 ) 0 . 2 5 0 . 0 3 ( 6 . 4 0 . 8 ) 0.040 dia (1.02) 0.155 (3.94) 0.955 (24.26) platform header seam seal platform header seam seal 0 . 0 0 0 0.000 0 . 2 4 5 ( 6 . 2 2 ) 0 . 2 3 0 ( 5 . 8 4 ) 1 . 8 4 5 ( 4 6 . 8 6 ) 2 . 3 2 0 ( 5 8 . 9 3 ) 0 . 2 3 0 ( 5 . 8 4 ) 2 . 3 2 0 ( 5 8 . 9 3 ) 1.110 (28.19) 12 6 1 0 flanged cases: designator "f" required in case option position of model number. smtr series single smtr series dual bottom view case k3 345 7 8 9 0 . 0 0 0 0 . 2 4 5 ( 6 . 2 2 ) 1 . 8 4 5 ( 4 6 . 8 6 ) 12 345 0 . 6 4 5 ( 1 6 . 3 8 ) 1 . 0 4 5 ( 2 6 . 5 4 ) 1 . 4 4 5 ( 3 6 . 7 0 ) 0 . 6 4 5 ( 1 6 . 3 8 ) 1 . 0 4 5 ( 2 6 . 5 4 ) 1 . 4 4 5 ( 3 6 . 7 0 ) 0.555 (14.1) 0.000 1.110 (28.19) 0.555 (14.1) dot on top of case indicates pin one dot on top of case indicates pin one smtr series single smtr series dual 0.162 dia (4.11) 0.162 dia (4.11)
10 smtr series 30 watt dc/dc c onverters definitions element evaluation: component testing/screening per mil-std-883 as determined by mil-prf-38534sem: scanning electron microscopy slam: scanning laser acoustic microscopy c-sam: c - mode scanning acoustic microscopy t able 1: e lement e valuation e lement e valuation s pace p rototype c lass c lass t est p erformed (o) h k ( component level ) m/s p m/s p m/s p element electrical yes no yes yes yes yes element visual no no yes yes yes yes internal visual no no yes no yes no temperature cycling no no no no yes yes constant acceleration no no no no yes yes interim electrical no no no no yes no burn-in no no no no yes no post burn-in electrical no no no no yes no steady state life no no no no yes no voltage conditioning /aging no no no no no yes visual inspection no no no no no yes final electrical no no yes yes yes yes w ire bond evaluation no no yes yes yes yes sem no no no no yes no slam/c-sam: input capacitors only no no no yes no yes (add? test, not req. by h or k) notes m/s active components (microcircuit and semiconductor die) p passive components ?
11 smtr series 30 watt dc/dc c onverters t able 2: p roduct e nvironmental s creening e nvironmental s creening s pace t est p erformed p rototype c lass c lass ( end item level ) (o) h k non-destruct bond pull method 2023 no no yes pre-cap inspection method 2017, 2032 yes yes yes temperature cycle method 1010, cond. c yes yes yes constant acceleration method 2001, 3000 g yes yes yes pind test method 2020, cond. b no yes yes radiography method 2012 no no yes pre burn-in test yes yes yes burn-in, method 1015, 125 c 96 hours yes no no 160 hours no yes no 2 x 160 hour (includes mid bi test) no no yes final electrical test mil-prf-38534, group a yes yes yes hermeticity test fine leak, method 1014, cond. a yes yes yes gross leak, method 1014, cond. c yes yes yes final visual inspection method 2009 yes yes yes test methods are referenced to mil-std-883 as determined by mil-prf-38534. ?
12 smtr series 30 watt dc/dc c onverters smtr rev e august 24, 2005 (case to input common). this revision supercedes all previous releases. all technical information is believed to be accurate, but no responsi- bility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. smtr series is a trademark of interpoint. copyright 1994 - 2005 interpoint. all rights reserved. t able 3: r adiation h ardness l evels contact information: interpoint headquarters usa phone: 1-800-822-8782 +425-882-3100 email: power@intp.com www .interpoint.com interpoint uk phone: +44-1252-872266 email: poweruk@intp.com interpoint france phone: +33-134285455 email: powerfr@intp.com product level availability environmental screening levels space prototype class class radiation hardness levels (o) h k o : standard, no radiation guarantee for system evaluation, electrically oo ho not and mechanically comparable to available h and k level. r : radiation hardened ?tested lots not up to 100 k rads (si) total dose available hr kr seu guarantee up to 40 mev r is referenced to mil-prf-38534, appendix g, radiation hardness assurance (rha) levels. ?

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