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description the smflhp series? 28 volt dc/dc converters are rated up to 100 watts output power over a ?55c 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 posi- tive or negative outputs. current sharing allows the units to be paralleled for total power of up to 228 watts. the welded, hermet- ically sealed package is only 3.005 x 1.505 x 0.400 inches, giving the series an overall power density of up to 67 watts per cubic inch. s creening smflhp converters offer screening options to space prototype (o), class h, or class k. radiation tolerant to radiation hardness assurance (rha) levels of ?-? (o), ?p? 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, qml screening? tables for more information. d esign f eatures the smflhp series converters are switching regulators that use a quasi-square wave, single ended forward converter design with a constant switching frequency of 600 khz. isolation between input and output circuits is provided with a transformer in the forward path and wide bandwidth magnetic coupling in the feedback control loop. the smflhp series uses a unique dual loop feedback technique that controls output current with an inner feedback loop and 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. tight load regulation is achieved through a wide-bandwidth magnetic feedback circuit. the output voltage on single smflhp models can be easily trimmed up by adding an external resistor. (see figure 2 for voltage changes with different resistor values.) i nhibit the smflhp 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. a low (<0.8 volts) is required between inh1 (pin 4) and input common (pin 2) to inhibit the converter. a low (<0.5 volts) is required between inh2 (pin 12) and output common (pin 8) to inhibit the converter. the application of intermediate voltages to these pins (1.5 to 10.5 volts) should be avoided. c urrent s haring and p arallel o peration multiple smflhp converters may be used in parallel to drive a common load (see figure 3). in this mode of operation the load current is shared by two or three smflhp converters. in current sharing mode, one smflhp 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) of the master unit. figure 3 shows the typical setup for two or three units in parallel. note that synchronizing the units together (though shown in the figure) 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). when paralleled, 76% of the total combined power ratings of the smflhp 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 ? ?55c to +125c operation ? 19 to 40 vdc input ? fully isolated ? magnetic feedback ? fixed frequency, 600 khz typical ? topology ? single ended forward ? inhibit function ? input and output ? sync function ? output trim on single output models ? indefinite short circuit protection ? remote sense on single output models ? up to 87% efficiency ? may be paralleled up to 228 watts models vdc o utput single 3.3 5 12 15 dual 5 12 15 crane aerospace & electronics power solutions smflhp single and dual dc/dc converters crane aerospace & electronics electronics group (interpoint brand) po box 97005 ? redmond wa 98073-9705 425.882.3100 ? electronics@craneae.com www.craneae.com page 1 of 13 rev h - 20071221 28 volt input ? 100 watt
operating conditions and characteristics input voltage range ? 19 to 40 vdc continuous ? 50 v for 50 msec transient output power ? up to 100 watts depending on model lead soldering temperature (10 sec per lead) ? 300c storage temperature range (case) ? ?65c to +150c power dissipation (pd) ? 20 watts case operating temperature (tc) ? ?55 to +125c full power ? ?55 to +135c absolute derating output power/current ? linearly from 100% at 125c to 0% at 135c output voltage temperature coefficient ? 100 ppm/c typical input to output capacitance ? 150 pf typical isolation ? 100 megohm minimum at 500 vdc, any pin to case audio rejection ? 50 db typical conversion frequency ? free run mode 600 khz typical 550 khz min, 650 khz. max ? external sync range 525 to 675 khz inhibit pin voltage (unit enabled) ? inh1 = 9 to12 v, inh2 = 6 to 9 v mechanical and environmental size (maximum) 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) see case u for dimensions. weight (maximum) 86 grams screening space prototype (o), class h, or class k radiation tolerant to radiation hardness assurance (rha) levels of ?-? (o), ?p? or ?r ?, per mil-std-38534. interpoint model numbers use an ?o? in the rha designator position to indicate the ?-? (dash) radiation hardnes s assurance level of mil-prf-38534, which is defined as ?no rha?. see ?class h and k, qml screening? tables for more information. available configurations: oo, ho, hp, hr, kr sync in and inhibit (inh1, inh2) sync in (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 ? if not used, connect to input common sync out ? referenced to input common inhibit (inh1, inh2) open collector ? logic low (output disabled) current ?10 to ?5 ma inh1 referenced to input common logic low 0.8 v max inh2 referenced to output common logic low 0.5 v max ? logic high (output enabled) open collector crane aerospace & electronics power solutions www.craneae.com page 2 of 13 rev h - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 watt
angled corner indicates pin one. 1 2 3 4 5 6 12 11 10 9 8 7 top view smflhp (pin side, marked side) see case u for dimensions. f igure 1: p in o ut pin 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 (mstr/inh2) (mstr/inh2) pin out pins not in use tr1 leave unconnected inhibit (inh1) leave unconnected sync out leave unconnected sync in connect to input common sense lines must be connected to appropriate outputs slave leave unconnected mstr (inh 2) leave unconnected crane aerospace & electronics power solutions www.craneae.com page 3 of 13 rev h - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 watt
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 voltage adjust connection 12 11 10 9 8 7 + 28v + inhibit sync in 0.1 0.2 0.3 0.4 0.5 70 140 210 280 350 25 50 75 100 125 20 40 60 80 100 ra (ohms) 5? 12? 15? vout increase (volt) 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 120 240 360 480 600 3.3? 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 igure 2: s ense c onnections and t rim t able f igure 3: p arallel c onnections single output models connection diagrams - sense and parallel crane aerospace & electronics power solutions www.craneae.com page 4 of 13 rev h - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 watt
model numbering key smflhp 28 05 s / k r base model input voltage output voltage screening number of outputs (s = single, d = dual) radiation level model selection smflhp28 / base model v out value number of outputs screening choose one from each of the following rows: v out value for singles 3r3, 5, 12, 15 for 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) screening oo* - space prototype, ho, hp, hr, kr * interpoint model numbers use an ?o? in the rha designator position to indicate the ?-? (dash) radiation hardness assurance leve l of mil-prf-38534,which is defined as ?no rha? crane aerospace & electronics power solutions www.craneae.com page 5 of 13 rev h - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 watt
notes 1. guaranteed by design, not tested. 2. unit will shut down above approximately 45v 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. electrical characteristics: ?55c to +125c tc, 28 vdc vin, 100% load, free run, unless otherwise specified. single output models smflhp283r3s smflhp2805s smflhp2812s smflhp2815s units parameter conditions min typ max min typ max min typ max min typ max output voltage tc = 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 = 19 to 40 vdc 0 ? 16 0 ? 16 0 ? 7.5 0 ? 6.67 a output power v in = 19 to 40 vdc 0 ? 53 0 ? 80 0 ? 90 0 ? 100 w output ripple 10 k h z - 2 mh z tc = 25c ? 10 25 ? 20 40 ? 15 50 ? 30 90 ? 30 85 ? 45 150 ? 30 95 ? 45 175 mv p-p tc = -55c to +125c line regulation v in = 19 to 40 vdc ? 0 50 ? 0 50 ? 0 50 ? 0 50 mv load regulation no load to full ? 0 20 ? 0 20 ? 0 20 ? 0 20 mv input voltage no load to full continuous 19 28 40 ? ? 50 19 28 40 ? ? 50 19 28 40 ? ? 50 19 28 40 ? ? 50 vdc v transient 1 , 2 50 ms input current no load ? 70 120 ? 9 15 ? 35 80 ? 70 120 ? 9 15 ? 35 80 ? 80 120 ? 9 15 ? 35 80 ? 80 120 ? 9 15 ? 35 80 ma inhibited - inh1 inhibited - inh2 input ripple current 10 k h z - 10 mh z ? 30 80 ? 30 80 ? 30 80 ? 30 80 ma p-p efficiency tc = 25c 70 72 ? 77 80 ? 81 86 ? 82 87 ? % load fault tc = 25c short circuit power dissipation ? 15 22 ? 1.5 10 ? 15 20 ? 1.5 4 ? 15 20 ? 1.5 4 ? 15 20 ? 1.5 4 w ms recovery 1 step load response 50% - 100% - 50% transient ? 350 400 ? 1.5 3.0 ? 350 450 ? 1.5 3.0 ? 450 700 ? 1.5 3.0 ? 450 700 ? 1.5 3.0 mv pk ms recovery 1 , 3 step line response 1 19 - 40 -19 vdc transient 4 ? 250 400 ? 200 300 ? 250 400 ? 200 600 ? 250 800 ? 200 600 ? 250 800 ? 200 600 mv pk s recovery 3 start-up delay ? 3.5 10 ? 0 50 ? 3.5 10 ? 0 25 ? 3.5 10 ? 0 50 ? 3.5 10 ? 0 50 ms mv pk overshoot 1 crane aerospace & electronics power solutions www.craneae.com page 6 of 13 rev h - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 watt
notes 1. guaranteed by design, not tested. 2. up to 70% of the total output power (current) is available from either output provided the opposite output is carrying 30% of the power (current) in use. 3. effect on negative vout from 50%/50% loads to 30%/70% or 70%/30% loads. 4. effect on negative vout from 50%/50% loads to 10% then 50% 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. electrical characteristics: ?55c to +125c tc, 28 vdc vin, 100% load, free run, unless otherwise specified. dual output models smflhp2805d smflhp2812d smflhp2815d units parameter conditions min typ max min typ max min typ max output voltage tc = 25c + v out 4.95 5.00 5.05 4.92 5.00 5.08 11.88 12.00 12.12 11.80 12.00 12.18 14.85 15.00 15.15 14.77 15.00 15.23 vdc - v out output current 2 v in = 19 to 40 vdc each output 0 ? 11.2 0 ? 16.0 0 ? 5.3 0 ? 7.5 0 ? 4.67 0 ? 6.67 a total output power 2 v in = 19 to 40 vdc each output 0 ? 56 0 ? 80 0 ? 63 0 ? 90 0 ? 70 0 ? 100 w total output ripple 10 k h z - 2 mh z + v out ? 25 150 ? 25 150 ? 50 175 ? 50 175 ? 50 225 ? 50 225 mv p-p - v out line regulation v in = 19 to 40 vdc + v out ? 0 50 ? 25 100 ? 0 50 ? 25 100 ? 0 50 ? 25 100 mv - v out load regulation no load to full + v out ? 0 50 ? 25 100 ? 10 100 ? 50 200 ? 10 100 ? 50 200 mv - v out cross regulation tc = 25c see note 3 ? 6 8 ? 7 8 ? 2 4 ? 2 4 ? 2 4 ? 2 4 % see note 4 input voltage no load to full continuous 19 28 40 0 ? 50 19 28 40 0 ? 50 19 28 40 0 ? 50 vdc v transient 1 , 5 50 ms input current tc = 25c no load ? 50 120 ? 9 14 ? 35 80 ? 50 120 ? 9 14 ? 35 80 ? 50 120 ? 9 14 ? 35 80 ma inhibited - inh1 inhibited - inh2 input ripple current 10 k h z - 10 mh z ? 30 80 ? 30 80 ? 30 80 ma p-p efficiency tc = 25c balanced load 75 80 ? 81 86 ? 82 87 ? % load fault tc = 25c power dissipation short circuit ? 15 20 ? 1.5 4.0 ? 15 20 ? 1.5 4.0 ? 15 20 ? 1.5 4.0 w ms recovery 1 , 6 step load response v out 50% - 100% - 50% transient ? 350 450 ? 1.5 3.0 ? 450 700 ? 1.5 3.0 ? 450 700 ? 1.5 3.0 mv pk ms recovery 1 , 6 step line response 1 v out 19 - 40 -19 vdc transient 1 , 7 ? 250 600 ? 200 300 ? 250 800 ? 200 600 ? 250 800 ? 200 600 mv pk s recovery 1 , 6 start-up delay ? 3.5 20 ? 0 25 ? 3.5 20 ? 0 50 ? 3.5 20 ? 0 50 ms mv pk overshoot 1 crane aerospace & electronics power solutions www.craneae.com page 7 of 13 rev h - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 watt
output (watts) smflhp2805s & smflhp2805d efficiency efficiency ( %) 60 90 85 80 75 70 10 30 50 70 90 28v 40v 65 19v f igure 4 output power (watts) smflhp2812s & smflhp2812d efficienc y efficiency ( %) 60 90 85 80 75 70 10 30 50 70 90 65 19v 28v 40v f igure 5 f igure 6 60 90 85 80 75 70 10 30 50 70 90 65 output power (watts) smflhp2815s & smflhp2815d efficienc y efficiency ( %) 19v 40v 28v 100 f igure 7 f igure 9 0.1 0. 20. 40. 60. 80. 100. attenuation (db) frequency (khz) smflhp series audio rejection 1 10 100 100mv/div. 100% to 50% 50% to 100% 1ms/div smflhp2805s step load response 50 s/div 19 to 40 v smflhp2805s step line response 100mv/div . 20v/div . vout vin f igure 8 1ms/div no load smflhp2805s turn on response 1v/div. 20v/div. vin vout f igure 10 50 s/div 19 to 40 v smflhp2815d step line response 100mv/div . +vout ?vout vin 20v/div . f igure 11 f igure 12 1ms/div smflhp2815d step load response 200mv/div. 100% to 50% 50% to 100% typical performance curves: 25c tc , 28 vdc vin, 100% load, free run, unless otherwise specified. crane aerospace & electronics power solutions www.craneae.com page 8 of 13 rev h - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 watt
f igure 13 f igure 15 5v/div. 20v/div. v in ?vout +vout 1ms/div no load smflhp2815d turn on response 30 40 50 60 70 80 16 18 17 90 19 output power (watts) low line dropout input voltage (volts) 100 smflhp2805s & 5d smflhp2815s & 15d smflhp2812s & 12d 0 30 40 50 60 ? 8 ? 6 ? 4 ? 2 2 4 6 8 smflhp2812d smflhp2805d 70 smflhp2815d output load (%) +pout 70 to 30 %, ?pout 30 to 70% cross regulation ?vout voltage change (%) f igure 14 typical performance curves: 25c tc , 28 vdc vin, 100% load, free run, unless otherwise specified. f igure 16 vin rise-time ( s) 10 600 700 400 500 200 300 0 line t ransient response mvp 100 1000 10000 100 -55? 125? 100? 25? smflhp2815d line transient response vs. vin rise-time crane aerospace & electronics power solutions www.craneae.com page 9 of 13 rev h - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 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 (11.43) 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 top view case u flanged case, short-leaded seam seal case dimensions in inches (mm) tolerance ?.005 (0.13) for three decimal places ?.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? for 10 seconds per pin materials header cold rolled steel/nickel/gold 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 igure 16: c ase u crane aerospace & electronics power solutions www.craneae.com page 10 of 13 rev h - 20071221 smflhp single and dual dc/dc converter cases 28 volt input ? 100 watt
c lass h and k, mil-prf-38534 e lement e valuation component-level test performed space prototype (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 (add?l 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 - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 watt
c lass h and k, mil-prf-38534 e nvironmental s creening end item-level test performed space prototype (o) non-qml 1 class h qml class k qml non-destruct bond pull method 2023 no yes 2 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 2 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 2 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 required by dscc but performed to assure product quality. crane aerospace & electronics power solutions www.craneae.com page 12 of 13 rev h - 20071221 smflhp single and dual dc/dc converters 28 volt input ? 100 watt
c lass h and k, mil-prf-38534 r adiation a ssurance radiation hardness assurance levels environmental screening levels space prototype (o) non -qml 2 class h qml class k qml o 1 : standard, no radiation guarantee oo ho n/a p : radiation tolerant?tested lots up to 30 k rads (si) total dose seu guarantee up to 40 mev n/a hp 3 n/a r : radiation tolerant?tested lots up to 100 k rads (si) total dose seu guarantee up to 40 mev n/a hr 3 kr 3 notes: 1. 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?. 2. space prototype (o), non-qml, products do not meet all of the requirements of mil-prf-38534. 3. redmond site, interpoint, has a radiation hardness assurance plan on file with dscc. our smd products with rha ?p" and "r" c ode meet dscc requirements. crane aerospace & electronics power solutions smflhp single and dual, rev h - 20071221. 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 specific ations without notice. smflhp series is a trademark of interpoint. copyright ? 1999 - 2007 interpoint corporation. all rights reserved. www.craneae.co m page 13 of 13 smflhp single and dual dc/dc converters 28 volt input ? 100 watt

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