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description the smfl series? 28-volt dc/dc converters are rated up to 65 watts output power over a -55 to +125c temperature range with a 28 vdc nominal input. on dual output models up to 70% of the rated output power can be drawn from either the positive or negative outputs. current sharing allows the units to be paralleled for total power of up to 148 watts. the welded, hermetically sealed package is only 3.0 x 1.5 x 0.40 inches, giving the series an overall power density of up to 43 watts per cubic inch. s c r e e n i n g smfl converters offer the following screening options: space prototype (o), class h, or class k. radiation tolerant to radiation hardness assurance (rha) levels of - (o) or r, per mil-std- 38534. interpoint model numbers use an o in the rha designator position to indicate the - (dash) radiation hardness assurance level of mil-prf-38534, which is defined as no rha. see class h and k, mil-prf-38534 screening tables for more information. d e s i g n f e a t u r e s smfl series converters are switching regulators that use a quasi- square wave, single ended forward converter design with a constant switching frequency of 600 khz typical. isolation between input and output circuits is provided with a trans - former in the forward path and a wide bandwidth magnetic coupling in the feedback control loop. the smfl uses a unique dual loop feedback technique that controls output current with an inner feed - back loop and an output voltage with a cascaded voltage mode feedback loop. the additional secondary current mode feedback loop improves transient response in a manner similar to primary current mode control and allows for ease of paralleling, but without the cost and complexity. the constant frequency, pulse-width modulated converters use a quasi-square wave single-ended forward design. tight load regula - tion is achieved through a wide-bandwidth magnetic feedback circuit. the output voltage on single smfl models can be trimmed to a specific output voltage by adding an external resistor (see figure 1 for resistor values). i n h i b i t the smfl series converters have two inhibit terminals (inh1 and inh2) that can be used to disable power conversion, resulting in a very low quiescent input current and no generation of switching noise. a logic low (<0.8 volts) is required to inhibit the converter between inh1 (pin 4) and input common (pin 2). a logic low (<0.5 volts) is required to inhibit the converter between inh2 (pin 12) and output common (pin 8). the application of intermediate voltages to these pins (1.5 to 10.5 volts) should be avoided. s y n c converters may be synced to an external clock (525 to 675 khz) or to one another by using the sync in or out pins. the nominal free-run switching frequency is 600 khz (see application note titled inhibit and synchronization). c u r r e n t a n d p a r a l l e l o p e r a t i o n multiple single output smfl converters may be used in parallel to drive a common load. in this mode of operation the load current is shared by two or three smfl converters. in current sharing mode, one smfl converter is designated as a master. the slave pin (pin 11) of the master is left unconnected and the mstr/inh2 pin (pin 12) of the master is connected to the slave pin (pin 11) of the slave units. the units designated as slaves have the mstr/inh2 pin (pin 12) connected to the sns rtn pin (pin 9). note that synchronizing the units together is not required for current sharing operation. a second slave unit may be placed in parallel with a master and slave; this requires the tri pin (pin 3) of the master unit to be connected to the sns rtn pin (pin 9). see figure 2 for a block diagram of parallel connections. when paralleled, 76% of the total combined power ratings of the smfl converters are available at the load. overload and short circuit performance are not adversely affected during parallel operation. features ? fully qualified to class h or k ? -55 to +125c operation ? 16 to 40 vdc input ? fully isolated ? magnetic feedback ? fixed frequency, 600 khz typical ? topology C single ended forward ? 50 v for up to 120 ms transient protection ? inhibit input side and output side ? sync function ? output trim on single output models ? indefinite short circuit protection ? remote sense on single output models ? up to 85% efficiency / 43 w/in 3 ? parallelable up to 148 watts models vdc o u t p u t single 3.3 5 12 15 dual 5 12 15 cleared by u.s. dod osr for public release osr case number 09s-0995, dated march 13, 2009. crane aerospace & electronics power solutions smfl s ingle and dual dc/dc converters crane aerospace & electronics electronics g roup (interpoint brand) po box 97005 ? redmond wa 98073-9705 425.882.3100 ? electronics@craneae.com www.craneae.com page 1 of 13 rev h - 20071102 28 vo l t input C 65 watt
operating c onditio ns and characteristics i nput voltage range ? 16 to 40 vdc continuous ? 50 v for 120 ms transient output power ? 40 to 65 watts depending on model lead s oldering t emperature (10 sec per lead) ? 300c storage temperature r ange (case) ? -65c to +150c power d issipation (pd) ? 14 watts (16 watts smfl2805s, smfl2805d) case operating t emperature (tc) ? -55c to +125c full power o utput voltage temperature coefficient ? 100 ppm/c typical i nput to output capacitance ? 150 pf, typical c urrent limit ? 125% of full load typical isolation ? 100 megohm minimum at 500 v audio rejection ? 50 db typical c onversion frequency (-55c to 125c) ? free run mode 600 khz typical 525 khz. min, 675 khz max inhibit p in voltage (unit enabled) ? inh1 = 9 to12 v, inh2 = 6 to 9 v mechanic al and environmental s ize (maximum) 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) see case u for dimensions. case options v, w, y, and z are available by special order. weight (maximum) 86 grams screening space prototype (o), class h, or class k radiation tolerant to radiation hardness assurance (rha) levels of - (o) or r, per mil-std-38534. interpoint model numbers use an o in the rha designator position to indicate the - (dash) radiation hardness assurance level of mil-prf-38534, which is defined as no rha. see class h and k, mil-prf-38534 screening tables for more information. available configurations: oo, ho, hr, kr sync in and inhibit (inh1, inh2) sync i n (525 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 sync out ? referenced to input common i nhibit (inh1, inh2) ttl open collector ? logic low (output disabled) inh1 referenced to input common logic low 0.8 v max inhibit pin current 10 ma max inh2 referenced to output common logic low 0.5 v max inhibit pin current 5 ma max ? logic high (output enabled) open collector crane aerospace & electronics power solutions www.craneae.com page 2 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
f i g u r e 3: p in o u t angled corner indicates pin one. 1 2 3 4 5 6 12 11 10 9 8 7 to p view smfl (pin side, marked side) see case u for dimensions. pin out pins n o t in use tr1 leave unconnected master leave unconnected slave leave unconnected sync in connect to input common inhibit (inh1) leave unconnected inhibit (inh2) leave unconnected sync out leave unconnected sense lines must be connected to appropriate ouputs p in single output dual output 1 positive input positive input 2 input common input common 3 triple (tri) triple (tri) 4 inhibit 1 (inh1) inhibit 1 (inh1) 5 sync out sync out 6 sync in sync in 7 positive output positive output 8 output common output common 9 sense return negative output 10 positive sense no connection 11 slave slave 12 master / inhibit 2 master / inhibit 2 crane aerospace & electronics power solutions www.craneae.com page 3 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
single output models connection diagrams - sense and parallel r l 1 2 3 4 5 6 remote sense connection 12 11 10 9 8 7 ? + 28v ? + inhibit sync in r l 1 2 3 4 5 6 output vo lt age adjust connectio n 12 11 10 9 8 7 ? + 28v ? + inhibit sync in 70 140 210 280 350 25 50 75 100 125 20 40 60 80 100 ra (ohms) 5?v 12?v 15?v vout increase (vo lt ) ra positive input input common tr1 inh1 sync out sync in mstr/inh2 slave pos. sense sense return output common positive output positive input input common tr1 inh1 sync out sync in mstr/inh2 slave pos. sense sense return output common positive output 0.1 0.2 0.3 0.4 0.5 3.3-v 120 240 360 480 600 f i g u r e 1: s e n s e c o n n e c t i o n s a n d t r i m t a b l e C s i n g l e o u t p u t m o d e l s r l 1 positive input input common tr1 inh1 sync out sync in 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 connect only when 2 slaves are used 12 11 10 9 8 7 12 11 10 9 8 7 12 11 10 9 8 7 ? + mstr/inh2 slave pos. sense sense return output common positive output master slave 1 slave 2 28v ? + inhibit sync in positive input input common tr1 inh1 sync out sync in mstr/inh2 slave pos. sense sense return output common positive output positive input input common tr1 inh1 sync out sync in mstr/inh2 slave pos. sense sense return output common positive output f i g u r e 2: p a r a l l e l c o n n e c t i o n s C s i n g l e o u t p u t m o d e l s crane aerospace & electronics power solutions www.craneae.com page 4 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
mo del nu mbering key smfl 28 05 s / k r base model input voltage output voltage screening number of outputs (s = single, d = dual) rha level smd n umbers s t a n d a r d m i c r o c i r c u i t d r a w i n g (s md) in process 5962-9316302hxc 5962-9316202hxc 5962-9316102hxc in process in process 5962-9319302hxc smfl s e r i e s s imilar p a r t smfl283r3s/ho smfl2805s/ho smfl2812s/ho smfl2815s/ho smfl2805d/ho smfl2812d/ho smfl2815d/ho 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 rha levels. for exact specifications for an smd product, refer to the smd drawing. call your interpoint representative for status on the smfl smd releases which are in process. smds can be down- loaded from: http://www.dscc.dla.mil/programs/smcr model selection smfl28 / base model v out value number of outputs case option screening & rha level choose one from each of the following rows v out value singles: 3r3, 5, 12, 15 duals: 5,12,15 r = decimal point, 3r3 = 3.3vdc number of outputs s (single) or d (dual) case option standard (case u, leave blank) v, w, y and z available by special order screening & rha level oo* - space prototype, ho, hr, kr * interpoint model numbers use an o in the rha designator position to indicate the - (dash) radiation hardness assurance level of mil-prf-38534, which is defined as no rha crane aerospace & electronics power solutions www.craneae.com page 5 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
notes 1. guaranteed by design, not tested. 2. unit will shut down above approximately 45 v but will be undamaged and will restart when voltage drops into normal range. 3. recovery time is measured from application of the transient to point at which vout is within 1% of final value. 4. transition time > 10 s. 5. tested on release from inhibit. 6. shall not compromise dc performance. electrical characteristics: -55c to +125c tc, 28 vdc vin, 100% load, rha level o, unless otherwise specified. singl e output models smfl283r3s smfl2805s smfl2812s smfl2815s units parameter conditions min typ ma x min typ ma x min typ ma x min typ ma x output voltage t c = 25c 3.26 3.30 3.34 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 vdc output current v in = 16 t o 40 vdc 0 12.12 0 10 0 5 0 4.33 a output power v in = 16 t o 40 vdc 0 40 0 50 0 60 0 65 w output ripple 10 k h z - 2 mh z t c = 25c 10 35 10 50 15 35 30 50 30 75 45 100 30 85 45 110 mv p-p t c = -55c to +125c line regulation v in = 16 to 40 vdc 0 20 0 20 0 20 0 20 mv load regulation no load t o full 40 20 20 20 mv input voltage continuous 16 28 40 50 16 28 40 50 16 28 40 50 16 28 40 50 vdc v transient 1 , 2 120 ms input current no load 70 100 9 14 35 70 70 120 9 14 35 70 50 100 9 14 35 70 50 100 9 14 35 70 ma inhibite d C inh1 inhibite d C inh2 input ripple 10 k h z - 10 mh z 30 50 30 50 30 50 30 50 ma p-p efficiency t c = 25c 70 75 78 81 84 82 85 % loa d fault short circuit power dissipation t c = 25c 12.5 16 1.5 4 12.5 16 1.5 4 10 16 1.5 4 10 16 1.5 4 w ms recovery 1 step load response 50% - 100% - 50% transient 200 300 1.5 3.0 250 350 1.5 3.0 450 600 1.5 3.0 500 600 1.5 3.0 mv pk ms recovery 1 , 3 step line response 1 , 3 16 - 40 -16 vdc transient 4 250 300 200 600 250 300 200 300 250 400 200 300 250 400 200 300 mv pk s recovery start-up 5 delay 3.5 10 3.5 6 3.5 6 3.5 6 ms crane aerospace & electronics power solutions www.craneae.com page 6 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
notes 1. guaranteed by design, not tested. 2. up to 70% of the total output power is available from either output providing the opposite output is simultaneously carrying 30% of the total power. 3. effect on negative vout from 50%/50% loads to 70%/30% or 30%/70% loads. 4. effect on negative vout from 50%/50% loads to 50% then 10% load on negative vout. 5. unit will shut down above approximately 45v but will be undamaged and will restart when voltage drops into normal range. 6. recovery time is measured from application of the transient to point at which vout is within 1% of final value. 7. transition time > 10 s. 8. tested on release from inhibit. 9. shall not compromise dc performance. 10. parallel load share function not characterized for dual output connectors. electrical characteristics: -55c to +125c tc, 28 vdc vin, 100% load, rha level o, unless otherwise specified. du al output models 10 smfl2805d smfl2812d smfl2815d units parameter conditions min typ ma x min typ ma x min typ ma x output voltage t c = 25c + v out 4.95 5.00 5.05 4.92 5.00 5.08 11.88 12.00 12.12 11.82 12.00 12.18 14.85 15.00 15.15 14.77 15.00 15.23 vdc - v out output current 2 v in = 16 t o 40 vdc ea ch output 0 7 0 10 0 3.5 0 5 0 3.03 0 4.33 a total output output power v in = 16 t o 40 vdc 0 50 0 60 0 65 w output ripple v out 10 k h z - 2 mh z 50 100 50 120 50 150 mv p-p line regulation v in = 16 t o 40 vdc + v out 0 50 25 100 0 50 25 100 0 50 25 100 mv - v out load regulation no load t o full + v out 0 50 25 100 10 50 50 120 10 50 150 150 mv - v out cross regulation t c = 25c see note 3 5 8 3 6 2 4 2 4 2 4 2 4 % see note 4 input voltage continuous 16 28 40 50 16 28 40 50 16 28 40 50 vdc v transient 1 , 5 120 ms input current no load 50 120 9 14 35 70 50 100 9 14 35 70 50 100 9 14 35 70 ma inhibitedCinh1 inhibitedCinh2 input ripple current 10 k h z - 10 mh z 30 50 30 50 30 80 ma p-p efficiency t c = 25c balanced load 75 78 81 84 82 85 % loa d fault t c = 25c short circuit power dissipation 12.5 16 1.5 4.0 10 14 1.5 4.0 10 14 1.5 4.0 w ms recovery 1 step load response v out 50% - 100% - 50% transient 250 350 1.5 3.0 450 600 1.5 3.0 500 600 1.5 3.0 mv pk ms recovery 1 , 7 step line response 1 , 6 v out 16 - 40 -16 vdc transient 7 250 300 200 300 250 400 200 300 250 400 200 300 mv pk s recovery start-up 8 delay 3.5 6 3.5 6 3.5 6 ms crane aerospace & electronics power solutions www.craneae.com page 7 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
typical performance curves: 25c tc, 28 vdc vin, 100% load, free run, unless otherwise specified. output (w atts) smfl2805s & smfl2805d ef ficiency ef ficiency (%) 60 90 85 80 75 70 10 20 30 40 50 28v 40v 65 16v f i g u r e 4 output power (w atts) smfl2812s & smfl2812d ef ficiency ef ficiency (%) 60 90 85 80 75 70 10 20 30 40 50 60 40v 16v 65 28v f i g u r e 5 f i g u r e 6 60 90 85 80 75 70 10 20 30 40 50 65 60 65 16v output power (w atts) smfl2815s & smfl2815d ef ficiency ef ficiency (%) 40v 28v f i g u r e 7 f i g u r e 9 60 65 70 75 80 85 90 01 02 03 04 05 06 0 70 40 v in 16 v in 28 v in output power (w atts) smfl2828s ef ficiency ef ficiency (%) 50 s/div 16 to 40 v smfl2805s step line response 100mv/div. 20v/div. v out vi n 0.1 0. 20. 40. 60. 80. 100. attenuation (db) frequency (khz) smfl series audio rejection 11 0 100 f i g u r e 8 100mv/div. 100% to 50% 50% to 100% 1ms/div smfl2805s step load response f i g u r e 10 1ms/div no load smfl2805s turn on response 1v/div. 20v/div. vi n v out f i g u r e 11 f i g u r e 12 50 s/div 16 to 40 v smfl2815d step line response 100mv/div. +v out ?v out vi n 20v/div. crane aerospace & electronics power solutions www.craneae.com page 8 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
f i g u r e 13 f i g u r e 15 1ms/div smfl2815d step load response 200mv/div. 100% to 50% 50% to 100% ?pout = 32.5w 0 30 40 50 60 ? 8 ? 6 ? 4 ? 2 2 4 6 8 smfl2812d smfl2805d 70 smfl2815d output load (%) +pout 80 to 20 %, ?pout 20 to 80% cross regulation ?vout voltage change (%) 5v/div. 20v/div. v in ?v out +v out 1ms/div no load smfl2815d turn on response f i g u r e 14 f i g u r e 16 10 20 30 40 50 60 11 15 14 13 12 65 16 smfl2815s & 15d smfl2805s & 5d output power (watts) low line dropout input voltage (volts) smfl2812s & 12d typical performance curves: 25c tc, 28 vdc vin, 100% load, free run, unless otherwise specified. crane aerospace & electronics power solutions www.craneae.com page 9 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
angled corner indicates pin one. 1 2 3 4 5 6 12 11 10 9 8 7 0.000 0.050 (1.27) 0.000 0.120 (3.05) 0.250 (6.35) 0.450 (1 1.43) 0.650 (16.51) 0.850 (21.59) 1.050 (26.67) 1.250 (31.75) 1.380 (35.05) 1.505 (38.23) max. 0.000 0.120 (3.05) 0.250 (6.35) 2.750 (69.85) 2.880 (73.15) 3.005 (76.33) max. 0.128 dia (3.25). 0.040 dia (1.02) 0.23 (5.8) lead length 0.400 (10.16) max. 0.220 (5.59 to p view case u flanged case, short-leaded seam seal case dimensions in inches (mm) to lerance 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 300c for 10 seconds per pin materials header cold rolled steel/nickel/gol d cover kovar/nickel pins #52 alloy/nickel/gold; compression glass seal case u, rev c, 20060302 please refer to the numerical dimensions for accuracy . all 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. copyright ? 1999-2006 interpoint corp. all rights reserved. *case u does not require designator in case option position of model number . f i g u r e 17: c a s e u crane aerospace & electronics power solutions www.craneae.com page 10 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converter cases 28 vo l t input C 65 watt
c l a s s h a n d k, mi l -prf-38534 e l e m e n t e v a l u a t i o n component-level test performed space proto type (o) non-qml 1 class h qml class k qml m/s 2 p 3 m/s 2 p 3 m/s 2 p 3 element electrical yes no yes yes yes yes element visual no no yes yes yes yes internal visual no n/a yes n/a yes n/a temperature cycling no no no no yes yes constant acceleration no no no no yes yes interim electrical no n/a no n/a yes n/a burn-in no n/a no n/a yes n/a post burn-in electrical no n/a no n/a yes n/a steady state life no n/a no n/a yes n/a voltage conditioning aging n/a no n/a no n/a yes visual inspection no no n/a no n/a yes final electrical no no yes yes yes yes wire bond evaluation 4 no no yes yes yes yes sem no n/a no n/a yes n/a slam?/c-sam: input capacitors only (addl test, not req. by h or k) no no no yes no yes notes: 1. non-qml products do not meet all of the requirements of mil-prf-38534. 2. m/s = active components (microcircuit and semiconductor die) 3. p = passive components 4. not applicable to emi filters that have no wirebonds. 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 crane aerospace & electronics power solutions www.craneae.com page 11 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
c l a s s h a n d k, mi l -prf-38534 e n v i r o n m e n t a l s c r e e n i n g end item-level test performed space proto type (o) non-qml 1 class h qml class k qml non-destruct bond pull 2 method 2023 no yes 3 yes pre-cap inspection method 2017, 2032 yes yes yes temperature cycle (10 times) method 1010, cond. c, -65c to 150c, ambient yes yes yes constant acceleration method 2001, 3000 g yes yes yes pind test method 2020, cond. a no yes 3 yes pre burn-in test yes yes yes burn-in method 1015, 125c case, typical 96 hours 160 hours 2 x 160 hours (includes mid-bi test) yes no no no yes no no no yes final electrical test mil-prf-38534 group a, subgroups 1 through 6 -55c, +25c, +125c case yes yes yes radiography method 2012 n/a n/a n/a post radiography electrical test room temperature n/a n/a yes 3 hermeticity test fine leak, method 1014, cond. a gross leak, method 1014, cond. c yes yes yes 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. notes: 1. space prototype (o), non-qml products, do not meet all of the requirements of mil-prf-38534. 2. not applicable to emi filters that have no wirebonds. 3. not required by dscc but performed to assure product quality. crane aerospace & electronics power solutions www.craneae.com page 12 of 13 rev h - 20071102 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt
c l a s s h a n d k, mi l -prf-38534 r a d i a t i o n a s s u r a n c e radiation hardness assurance levels environmental screening levels space protot ype (o) n o n -qml 3 class h qml class k qml o 2 : standard, no radiation guarantee oo ho n/a p 5 : radiation tolerantCtested lots up to 30 k rads (si) total dose seu guarantee up to 40 mev n/a hp 4 kp 4 r 5 : radiation tolerantCtested lots up to 100 k rads (si) total dose seu guarantee up to 40 mev n/a hr 4 kr 4 f 5 : [ smrt only ] radiation tolerantCtested lots up to 300 k rads (si) total dose seu guar - antee up to 60 mev n/a n/a kf 4 h 1,5 : radiation tolerantCtested lots up to 1,000 k rads (si) total dose n/a hh 4 kh 4 notes: 1. our emi filters are designed exclusively with passive components providing maximum tolerance for space environment requirements. 2. interpoint model numbers use an o in the rha designator position to indicate the - (dash) radiation hardness assurance level of mil-prf-38534, which is defined as no rha. 3. space prototype (o), non-qml, products do not meet all of the requirements of mil-prf-38534. 4. redmond site, interpoint, has a radiation hardness assurance plan on file with dscc. our smd products with rha p, r," "f" and "h" code meet dscc requirements. 5. space converters are available with radiation hardness assurance (rha) levels of o and r with the following exceptions: smrt28xxx is only available with radiation hardness assurance (rha) levels of o p, r and f. smhp120xxx is only available with radiation hardness assurance (rha) level of o. space filters are only available with radiation hardness assurance (rha) levels of o and h. crane aerospace & electronics power solutions smfl single and dual, rev h - 20071102. 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. smfl series is a trademark of interpoint. copyright ? 1999 - 2007 interpoint corporation. all rights reserved. www.craneae.com page 13 of 13 smfl s ingle and dual dc/dc converters 28 vo l t input C 65 watt

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