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1 smsa series 5 watt models vdc o utput dc/dc c onverters 28 v olt i nput single 3.3 5 12 15 dual ? ?2 ?5 size (max.): 1.075 x 1.075 x 0.270 inches (27.31 x 27.31 x 6.86 mm) see figures 23 and 24 for dimensions. weight: 15 grams maximum. screening: space prototype, class h, or class k (mil-prf-38534) radiation hardness levels o or r available configurations: oo, ho, hr, kr description the smsa series of high frequency dc/dc converters offers a new standard of performance for low power, space qualified dc/dc converters. smsa converters provide up to 5 watts output power over the full military temperature range of ?5? to +125? with up to 76% efficiency. thick-film hybrid techniques provide military/aero- space reliability levels and optimum miniaturization. the hermeti- cally sealed case is only 1.075 by 1.075 inches ?with a height of only 0.270 inches. power density for the smsa series converters is 16 watts per cubic inch. the smsa series small size, light weight, and hermetically sealed metal packages make them ideal for use in space, military, aerospace and other high reliability applications. s creening and r eports smsa converters offer three screening options ?space prototype class h, or class k ?and two levels of radiation hardness. see tables 1 through 3 for more information. detailed reports on product performance are also available and are listed in table 4. c onverter d esign the smsa converters are switching regulators that use a flyback converter design with a constant switching frequency of 550 khz. they are regulated, isolated units using a pulse width modulated topology and built as high reliability thick-film hybrids. isolation between input and output circuits is provided with a transformer in the forward power loop and an optical link in the feedback control loop. excellent input line transient response and audio rejection is achieved by an advanced feed-forward compensation technique. negative output regulation is maintained by tightly coupled magnetics. predictable current limit is accomplished by direct moni- toring of the output load current, which results in a constant current output above the overload point. internal input and output filters eliminate the need for external capacitors. w ide v oltage r ange the smsa converters are designed to provide full power operation over the full 16 to 40 vdc voltage range. an undervoltage lockout feature keeps the converter shutdown below approximately 13 vdc to ensure smooth initialization. i mproved d ynamic r esponse the smsa feed-forward compensation system provides excellent dynamic response and noise rejection. audio rejection is typically 50 db. the minimum to maximum step line transient response is typi- cally less than 1%. i nhibit f unction smsa converters provide a ttl open collector-compatible inhibit feature that can be used to disable internal switching and inhibit the units output. inhibiting in this manner results in low standby current, and no generation of switching noise. the converter is inhibited when the 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 11 vdc. in the inhibit mode, a maximum of 4 ma must be sunk from the inhibit pin at 28 vdc input. f eatures fully qualified to class h or k radiation hardened ?5 to +125? operation 16 to 40 vdc input fully isolated optocoupler feedback fixed frequency, 550 khz typical topology ?single ended flyback inhibit function indefinite short circuit protection 5 watts output power up to 76% efficiency
recommended operating conditions typical characteristics inhibit absolute maximum ratings input voltage 16 to 40 v output power 5 watts lead soldering temperature (10 sec per lead) 300? storage temperature range (case) ?5? to +135? 2 smsa series 5 watt dc/dc c onverters output voltage temperature coefficient 100 ppm/? typical input to output capacitance 50 pf typical isolation 100 megohm minimum at 500 v audio rejection 50 db typical conversion frequency 550 khz typical 450 khz min, 600 khz max inhibit pin voltage (unit enabled) ? to 11 v input voltage range 16 to 40 vdc continuous 50 v for up to 50 msec transient case operating temperature (tc) ?5? to +125? full power ?5? to +135? absolute derating output power/current (tc) linearly from 100% at 125? to 0% at 135? electrical characteristics: 25? tc, 28 vdc vin, 100% load, radiation level o, unless otherwise specified. inhibit ttl open collector logic low (output disabled) logic low voltage 0.8 v max inhibit pin current 4 ma max referenced to input common logic high (output enabled) open collector notes 1. indefinite short circuit protection not guaranteed above 125? (case). 2. recovery time is measured from application of the transient to point at which v out is within 1% of v out at final value. 3. guaranteed but not tested. single output models smsa283r3s smsa2805s smsa2812s smsa2815s parameter conditions min typ max min typ max min typ max min typ max units output voltage tc = ?5? to +125? 3.25 3.30 3.35 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 vdc output current tc = ?5? to +125? v in = 16 to 40 vdc 0 1200 0 1000 0 417 0 333 ma output power v in = 16 to 40 vdc tc = ?5? to +125? 4 5 5 5 w output ripple voltage 10 khz - 2 mhz 300 600 150 450 125 500 150 600 mv p-p line regulation v in = 16 to 40 vdc tc = ?5? to +125? 10 50 10 50 10 50 10 50 mv load regulation no load to full tc = ?5? to +125? 10 50 10 50 10 50 10 50 mv input voltage tc = ?5? to +125? no load to full continuous 16 28 40 16 28 40 16 28 40 16 28 40 vdc transient 3 50 ms 0 50 0 50 0 50 0 50 v input current no load 35 60 35 60 35 60 35 60 full load 250 250 235 235 ma inhibited 3 5 3 5 3 5 3 5 input ripple 10 khz - 10 mhz 50 200 50 200 50 200 50 200 ma p-p current tc = ?5? to +125? 60 300 60 300 60 300 60 300 efficiency 60 68 74 69 74 % load fault 1, 2 power dissipation 1.5 2.4 1.5 2.0 1.2 1.9 1.2 1.8 w short circuit recovery 12.5 25 12.5 25 1 10 1 10 ms step load 50% - 100% - 50% response transient 200 500 200 500 300 750 400 1000 mv pk recovery 2, 3 200 500 200 500 400 1000 400 1000 ? step line transient response 2, 3 16 to 40 v in 200 500 200 500 200 800 200 500 mv pk 40 to 16 v in 200 500 200 500 250 600 200 500 recovery 16 to 40 v in 400 1000 400 1000 700 1300 500 1300 ? 40 to 16 v in 400 1000 400 1000 700 1300 500 1300 start-up delay 10 75 10 75 10 75 10 75 ms overshoot 3 0 200 0 200 0 500 0 500 mv pk
3 smsa series 5 watt dc/dc c onverters electrical characteristics: 25? tc, 28 vdc vin, 100% load, radiation level o, unless otherwise specified. notes 1. up to 4 watts (80% of full power) is available from either output providing the opposite output is carrying 20% of total power. 2. shows regulation effect on the minus output during the defined cross loading conditions, with 80% and 20% referring to the total output power of the converter. see figures 15 and 16. 3. indefinite short circuit protection not guaranteed above 125? (case). 4. recovery time is measured from application of the transient to point at which v out is within 1% of v out at final value. 5. guaranteed but not tested. dual output models smsa 2805d smsa2812d smsa2815d 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 4.9 5.0 5.1 11.76 12.00 12.24 14.70 15.00 15.30 output current 1 v in = 16 to 40 vdc tc = ?5? to +125? 500 800 208 333 167 267 ma output power 1 v in = 16 to 40 vdc tc = ?5? to +125? 5 5 5 w output ripple volt. 10 khz - 2 mhz 300 80 300 120 300 mv p-p line regulation vin = 16 to 40 vdc tc = ?5? to +125? +v out 20 100 20 100 10 50 mv ? out 40 200 40 200 40 180 load regulation no load to full tc = ?5? to +125? +v out 10 120 10 120 10 50 mv ? out 100 400 100 400 50 200 cross regulation 2 +p o = 30 - 70 %, ? o =70 - 30% 5 8 3.7 6 3 6 % ? o = 30 - 70 %, +p o = 70 - 30% input voltage no load to full continuous 16 28 40 16 28 40 16 28 40 vdc transient 5 50 msec 50 50 50 v input current no load 30 50 40 63 38 60 full load 248 235 235 ma inhibited 3 5 3 5 3 5 input ripple 10 khz to 10 mhz 50 200 50 200 50 200 current tc = ?5? to +125? 60 300 60 300 60 300 ma p-p efficiency 65 70 67 73 68 73 % load fault 3, 4 power dissipation short circuit 1.3 1.8 1.3 1.7 1.3 1.6 w recovery 50 1 30 1 50 ms step load 50% - 100% - 50% balanced response transient 200 ?50 200 ?50 220 ?00 mv recovery 4, 5 200 500 200 500 200 500 ? step line resp. 4, 5 transient 16 to 40 vdc 200 ?00 200 ?00 600 1500 40 to 16 vdc 200 ?00 200 ?00 600 ?500 mv pk recovery 16 to 40 vdc 300 750 300 750 500 1200 40 to 16 vdc 800 2000 800 2000 500 1200 ? start-up delay 10 30 10 30 10 25 ms overshoot 5 0 500 0 500 0 500 mv pk
4 smsa series 5 watt dc/dc c onverters positive input inhibit pwm control negative output output common positive output input common case ground 6 5 7 8 1 2 3 feedback output filter output filter error amp = dual output vr f igure 1: smsa b lock d iagram 6 5 7 200 pf 3.9 k 10 k inhibit smsa input common positive input 10 k vcc typically 1.5 v when inhibited 12 k 5 k 400 50 k 2n3904 f igure 2: i nhibit i nterface
5 smsa series 5 watt dc/dc c onverters + c 2 t 1 c 1 case c 3 smsa2815s input common positive input positive output output common to load positive input input common positive output output common from input power source emi filter case t 1 negative output + c 2 t 1 c 1 t 1 c 4 c 3 c 5 + to loads case smsa2815d input common positive input positive output output common positive input input common positive output output common from input power source emi filter case f igure 3: l ow n oise o utput f ilter for smsas ingle o utput m odel f igure 4: l ow n oise o utput f ilter for smsa d ual o utput m odel the filter suggestions in figures 3 and 4 will further reduce the output ripple for systems requiring very low output noise. c1 = 0.27 f ceramic capacitor, 500v c2 = c4 = 6.8 f tantalum capacitor c3 = c5 = 0.27 f ceramic capacitor single output: t1 = 15t #28 awg winding on toroid, i = 5000 dual output: t2 = 10t #28 awg winding on toroid, i = 5000 for best results, make interconnections as short as possible.
model numbering key smd numbers pin out 6 smsa series 5 watt dc/dc c onverters smsa 28 05 s / k r base model radiation tolerance voltage in (28v) output voltage environmental screening number of outputs (s = single, d = dual) pin single output dual output 1 positive output positive output 2 output common output common 3 no connection negative output 4 no connection no connection 5 inhibit inhibit 6 positive input positive input 7 input common input common 8 case ground case ground s tandard m icrocircuit d rawing (smd) in process 5962-9309202hxc 5962-9309302hxc 5962-9309402hxc 5962-9308902hxc 5962-9309002hxc smsa s eries s imilar p art smsa283r3s/ho smsa2805s/ho smsa2812s/ho smsa2815s/ho smsa2812d/ho smsa2815d/ho the smd number shown is for class h screening 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 representative for status on the smsa smd releases which are in process. smds can be downloaded from: http://www.dscc.dla.mil/programs/smcr bottom view smsa 876 5 4 3 2 1 squared corner on header and dot on top of cover indicate pin one. f igure 5: p in o ut b ottom v iew see figures 23 and 24 for dimensions.
7 smsa series 5 watt dc/dc c onverters typical performance curves: 25? tc, 28 vdc vin, 100% load, unless otherwise specified. f igure 5 f igure 7 output power (watts) smsa2815d efficiency e f f ic ie n c y ( %) 30 80 40v 70 60 50 40 12345 6 16v 28v 100 s/div 16v to 40v smsa2805s step line response 20mv /d iv . v in 20v /d iv . v out output power (watts) smsa2805s efficiency e f f ic ie n c y ( %) 30 80 40v 70 60 50 40 12345 6 16v 28v f igure 2 output power (watts) smsa2812s efficiency e f f ic ie n c y ( %) 30 80 40v 70 60 50 40 12345 6 16v 28v f igure 3 frequency (khz) smsa series audio rejection a t t e n u a t io n ( d b ) 100 0.1 1 10 100 90 80 70 60 50 40 30 20 10 f igure 6 f igure 4 output power (watts) smsa2815s efficiency e f f ic ie n c y ( %) 30 80 40v 70 60 50 40 12345 6 16v 28v f igure 11 f igure 13 200 s/div 16v to 40v smsa2815d input step line response 10 0 mv /d iv . v in 2 0 v /d iv . +v out v out 200 s/div 10% 90% smsa2815d +v o step load response 2 0 0 mv /d iv . 10% to 90% 90% to 10% p out =0.5w 100 s/div 50% 100% smsa2805s step load response 50m v /d iv . 50% to 100% 100% to 50% f igure 8 100 s/div 10% 100% smsa2805s step load response 50m v /d iv . 10% to 100% 100% to 10% f igure 9 100 s/div 10% 50%) smsa2815d +v o step load response 1 0 0 mv /d iv . 10% to 50% 50% to 10% p out =2.5w f igure 12 f igure 10 1 ms / div smsa2805s turn-on into no load 1v/d iv . v in 2 0 v/d iv . v out
8 smsa series 5 watt dc/dc c onverters typical performance curves: 25? tc, 28 vdc vin, 100% load, unless otherwise specified. f igure 17 output power (watts) 50 mv drop smsa low line dropout vs. load in p u t v o l t age ( v o l ts ) 12 17 16 15 14 13 12345 6 2805s 2815s 2812s 500 s/div smsa2815d turn-on into no load 5v/d iv . v in 20v/d iv . +v out v out f igure 14 output load (+v out % / v out %) 90 10% load on +v, 10-90% load on v smsa dual cross regulation v o u t v o l t a g e c ha n g e (% ) 10 0 10 90/10 70/30 50/50 30/70 10/90 8 6 4 2 2 4 6 8 2815d 2812d f igure 15 output power (watts) 50 mv drop smsa low line dropout vs. load in p u t v o l t age ( v o l ts ) 12 17 16 15 14 13 12345 6 2812d 2815d f igure 18 f igure 16 output load (%) cond. a: 50% load +v; 10% to 50% v cond. b: 50% load v; 10% to 50% +v smsa dual cross regulation v o u t v o l t a g e c ha n g e ( % ) 5 0 5 10 20 30 40 50 4 3 2 1 1 2 3 4 2815d 2812d 2812d cond b cond a
9 smsa series 5 watt dc/dc c onverters case c bottom view see figure 24 for pin configurations. 1.075 max (27.31) materials header cold rolled steel/nickel/gold cover cold rolled steel/nickel pins copper/nickel/gold compression glass seal 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 1.075 max (27.31) 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 0.000 0.132 (3.35) 0.932 (23.67) 0.000 0.132 (3.35) 876 5 4 3 2 1 0.332 (8.43) 0.532 (13.51) 0.732 (18.59) 0.932 (23.67) 0.025 (0.64) dia. 0.000 0.270 max. (6.86) smsa series bottom view case c1 0.205 0.010 (5.21 0.25) projection weld squared corner and dot on top of case indicate pin one. f igure 24: c ase c1 f igure 23: c ase c m aximum d imensions note: although every effort has been made to render the case drawings at actual size, variations in the printing process may ca use some distortion. please refer to the numerical dimensions for accuracy.
10 smsa series 5 watt dc/dc c onverters definitions element evaluation: component testing/screening per mil-std-883 as determined by mil-prf-38534 sem: scanning electron microscopy slam : scanning laser acoustic microscopy c-sam: c - mode scanning acoustic microscopy notes m/s active components (microcircuit and semiconductor die) p passive components 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 wire 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 l test, not req. by h or k)
11 smsa series 5 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)hk non-destruct bond pull method 2023 no yes 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 smsa series 5 watt dc/dc c onverters smsa rev d this revision supercedes all previous releases. all technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. smsa series is a trademark of interpoint. copyright ? 1997-2003 interpoint corporation. all rights reserved. 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 t able 3: r adiation h ardness l evels 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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