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features built in mil- std-461 e mi filter output trim from 51% to 124% of nominal operating temperature -55 to +125c ? qualified to mil-prf-38534 class h and k ? radiation hardness assurance (rha) to ? level f 300 krad(si) input voltage range 19 to 56 vdc ? transient protection 80 v for 120 ms ? fully isolated, 5 port isolation ? dual magnetic feedback ? fixed high frequency switching ? remote sense ? inhibit function ? synchronization input ? indefinite short circuit protection ? radiation tolerant to ? 1 x 10 - 12 protons/cm 2 neutron or proton fluence 10 - 11 rad(si)/sec dose rate 3 x 10 - 5 rad(si) total dose see - let to 80 mev cm - 2 /mg meets mil-std-704a transient standards ? description the smrt28 series? of dc/dc converters offers up to 35 watts of power in a radiation tolerant design. the low profile smrt28 converters are manufactured in interpoints fully certified and qualified mil-prf-38534 production facility and packaged in hermetically sealed steel cases. they are ideal for use in programs requiring high reliability, small size, and high levels of radiation hardening assurance. the smrt28 converters are switching regulators which use a two-phase, phase shifted flyback design with a nominal switching frequency of 300 khz. close regulation is maintained with advanced constant frequency pulse width modulation design techniques. the smrt28s feed-forward compensation and discontinuous topologies provide high levels (80 db peak) of input-to-output ripple rejection. two independent feedback loops are used to regulate the dual and triple outputs, one feedback loop regulates the two-phased single output. each set of outputs is electrically isolated from the other and from the input. this product configuration eliminates cross regulation effects between output sets. configurations: ? single output: one two-phase single output ? dual output: two single-phase single outputs ? triple output: one single-phase independent main output and one single-phase dual output. ( auxiliary output) models vdc o u t p u t single 3.3 5 8.7 12 15 dual 5 12 15 triple +3.3 & 12 +3.3 & 15 +5 & 7 +5 & 12 +5 & 15 cleared by the u.s. department of defense (dod) office of security review (osr) for public release. osr case number 11-s-0729, dated january 4, 2011. crane aerospace & electronics power solutions smrt28 s ingle, dual and triple s pace dc/dc converters page 1 of 22 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24 crane aerospace & electronics crane electronics, inc. power solutions C interpoint po box 97005 ? redmond wa 98073-9705 425.882.3100 ? power@crane-eg.com www.craneae.com/interpoint
u n d e r v o l t a g e l o c k o u t the converters have an undervoltage lockout that will allow power conversion at approximately 17 volts on a rising input voltage and a conversion shut-down on a falling voltage at approximately 14.5 volts. i n h i b i t f u n c t i o n the smrt28 series incorporates an inhibit terminal that can be used to disable internal switching. it is not recommended to tie the inhibit pin of an smrt28 directly to the inhibit pin of another converter as the smrt28 inhibit pin can sink current. when pulling multiple inhibit signals low a separate interface is recommended for each smrt28. the converter is inhibited when the inhibit pin is pulled low (0.4 v). in the inhibit mode the inhibit pin current requirement is less than ~2 ma. the converter resumes normal operation when a high ( 2.4 v) signal or open circuit is applied to the inhibit pin. the open circuit voltage of the inhibit is 5 to 6 volts. although open circuit is the preferred method for the enabled state, up to 10 volts may be applied to the inhibit pin. s y n c h r o n i z a t i o n the sync input is isolated which allows sync return to be tied to the primary side, secondary side, or float with respect to all inputs and outputs. input current into this pin is limited by a series 1 k ohm resistance. o u t p u t v o l t a g e t r i m the output voltage of each set can be trimmed from 51% to 125% of nominal (varies by model, see trim instructions on page 4). the following are sets of voltages in relation to trim: ? triple output models: main output is one set, the dual outputs are another set. ? dual outputs: each output is a set. one set can be trimmed using the trim pin, the other set can be trimmed (up only) using the positive sense pin. ? single: one set r a d i a t i o n t o l e r a n c e the smrt28 dc/dc converters are designed to provide continuous normal operation through radiation levels associated with space missions and in tactical and strategic military environments. the converters will operate normally in radiation environments with up to 1 x 10 12 neutrons per square centimeter neutron fluence, 10 11 rad(si) per second dose rate, and 3x10 5 rad(si) total dose. these levels of radiation tolerance make the smrt28 converters suitable for electronics in programs where operation in high radiation environments is required. at the highest dose rate (10 11 rad(si)/sec dose rate) there will be an upset resulting in a dip in the voltage. this is non-destructive to the unit. the converter will operate through the upset. s c r e e n i n g smrt28 converters offer the following screening options: space prototype (o), class h, or class k. radiation tolerant to radiation hardness assurance (rha) levels of - (o), p, r or f, per mil-prf-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 screening tables 1, 2 and 3 for more information. emi the smrt28 has a built-in emi input filter which brings the conducted emissions into compliance with both methods of mil-std-461, revisions c-ce03 and d-/e-/f-ce102. s e n s e tight load regulation is maintained via wide bandwidth magnetic feedback and through the use of remote sense on single output models and one output (output a) of the dual units. the sense feature can be used to adjust the output voltage by connecting a resistor between the positive sense line and the positive output. s e n s e a d j u s t i n s t r u c t i o n s f o r o u t p u t a o n d u a l m o d e l s a d j u s t u p o n l y (s ee trim tables on page 4 for more options) r a d j u s t = 240 ( vout - vnom ) vmax - vout vout = desired output voltage vnom = nominal unadjusted output voltage vmax = maximum achievable output voltage 5v vmax = 6.0 v 12v vmax = 14.68 v 15v vmax = 18.36v n ote: r adjust should be connected between sense a (pin 8) and vout a (pin 11). crane aerospace & electronics power solutions www.craneae.com/interpoint page 2 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
operating c onditio ns and characteristics input voltage range 19 to 56 vdc continuous ? 80 v for 120 ms transient ? output power up to 35 watts depending on model ? lead s oldering t emperature (10 sec per pin) 300c ? storage temperature r ange (case) -65c to +150c ? c ase operating t emperature (tc) -55c to +125c full power ? -55c to +135c absolute ? derating output power/current linearly from 100% at 125c to 0% at 135c ? p ower dissipation (pd) 20 to 31 w ? output voltage temperature coefficient 100 ppm/c max ? c urrent limit 125% of full load typical ? isolation at 25 c 100 megohm minimum at 500 v ? audio rejection 50 db typical ? c onversion frequency 300 khz typ 270 khz min, 330 khz max ? r adiation (will operate through) 1x10 ? 12 neutrons/cm 2 neutron or proton fluence radiation dose rate 10 ? 11 rad(si) /sec total dose up to 300 krad(si) ? ? see - let to 80 mev cm 2 /mg mechanic al and environmental s ize (maximum) 2.705 x 2.205 x 0.400 inches (68.71 x 56.01 x 10.16 mm) ? see case s for dimensions. ? weight (maximum) 100 grams maximum ? screening space prototype, class h, or class k are radiation tolerant to radiation hardness assurance (rha) levels of - (o), p, r, or f per mil-prf-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 screening tables 1, 2 and 3 for more information. available configurations: oo, hp, hr, kp, kr, kf sync and inhibit sync input frequency 270-330 khz ? duty cycle 20% min, 80% max ? 2.5 v p-p minimum amplitude ? 10 v p-p maximum amplitude ? sync circuit is floating and isolated ? if sync is used at lower end of the range, full load ? operation is not guaranteed. inhibit converter disabled (active low) ? in h referenced to input common ? active low, pulled to 0.4 v or lower ? inhibit pin current ? < 2 ma converter enabled (active high) ? active high >2.4 v ? n ot to exceed 10 v ? open pin voltage 5 to 6 v ? crane aerospace & electronics power solutions www.craneae.com/interpoint page 3 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
trim tables t r i m d o w n singles r t r i m should be connected between the trim pin and positive sense pin. duals r t r i m should be connected between the t rim b pin and p ositive vout b pin. this only trims output b, output a can use the sense pin to trim up only. see page 2 for instructions on trimming up output a. triples r t r i m should be connected between the trim a pin and p ositive vout a pin to adjust the main output. r t r i m should be connected between the t rim b pin and p ositive vout b pin to adjust the auxiliary outputs. r t r i m = k ( vout - vmin ) vnom - vout vout = desired voltage; k/vmin/vnom from table below. v nom k v min % of v nom 3.3 3500 3.18 96 5.0 4520 4.16 83 7.0 8020 5.47 78 8.7 9040 6.13 70 12 11030 7.05 58 15 12900 7.65 51 1 2 3 4 5 14 13 12 11 10 9 8 smrt single sense trim 1 2 3 4 5 14 13 12 11 10 9 8 smrt dual vout b trim b 1 2 3 4 5 14 13 12 11 10 9 8 smrt triple vout a trim a trim b +vout b t r i m u p singles r t r i m should be connected between the trim pin and sense return pin. duals r t r i m should be connected between the t rim b pin and vout b return pin. this only trims output b, output a can use the sense pin to trim up only. triples r t r i m should be connected between the trim a pin and vout a return pin to adjust the main outputs. r t r i m should be connected between the t rim b pin and vout b return pin to adjust the auxiliary outputs. r t r i m = k ( vmax - vout ) vout - vnom vout = desired voltage; k/vmax/vnom from table below. v nom k v max % of v nom 3.3 3000 3.70 112 5.0 3000 6.26 125 7.0 5300 8.27 118 8.7 5300 10.46 149 12 5300 14.69 122 15 5300 18.54 124 1 2 3 4 5 14 13 12 11 10 9 8 smrt single sense return trim 1 2 3 4 5 14 13 12 11 10 9 8 smrt dual vout b return trim b 1 2 3 4 5 14 13 12 11 10 9 8 smrt triple vout a return trim a trim b vout b return f i g u r e 1: t r i m d o w n d i a g r a m s f i g u r e 2: t r i m u p d i a g r a m s n ote: do not exceed maximum power rating when trimming up. n ote: do not exceed maximum current rating when trimming down, crane aerospace & electronics power solutions www.craneae.com/interpoint page 4 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
f i g u r e 3: s mrt s i n g l e b l o c k d i a g r a m crane aerospace & electronics power solutions www.craneae.com/interpoint page 5 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24 28v vout a rtn. ocp ocp inhibit vin vin rtn. trim sense sense rtn. vout a vout a vout a rtn. clock phase a phase b prim. bias prim. bias sync in prim. bias bias 2 oscillator oscillator bias 1 bias 2 feed forward compensation 28v prim. bias feedback feedback 5.1v z prim. bias primary secondary bias 1 sync rtn. error amp / ref / compensation bias 1 emi filter prim. bias pwm isolation pwm isolation 28v
f i g u r e 4: s mrt d u a l b l o c k d i a g r a m crane aerospace & electronics power solutions www.craneae.com/interpoint page 6 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24 28v vout a rtn. vout a rtn ocp ocp inhibit vin vin rtn. sense a sense a rtn. vout a vout b vout b rtn. vout b rtn. clock phase a phase b prim. bias prim. bias sync in prim. bias bias 2 oscillator bias 1 bias 2 feed forward compensation 28v prim. bias feedback feedback 5.1v z prim. bias primary secondary bias 1 sync rtn. error amp / ref / compensation oscillator bias 1 bias 2 emi filter trim b prim. bias error amp / ref / compensation pwm isolation pwm isolation 28v
f i g u r e 5: s mrt t r i p l e b l o c k d i a g r a m crane aerospace & electronics power solutions www.craneae.com/interpoint page 7 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24 28v 28v vout a rtn. vout a rtn. ocp ocp inhibit vin vin rtn. trim a vout a vout b pos. vout b rtn. vout b rtn. clock phase a phase b prim. bias prim. bias sync in prim. bias bias 2 oscillator bias 1 bias 2 feed forward compensation 28v prim. bias feedback feedback 5.1v z prim. bias primary secondary vout b neg. sync rtn. bias 1 oscillator error amp / ref / compensation bias 2 bias 1 trim b emi filter error amp / ref / compensation prim. bias pwm isolation pwm isolation
f i g u r e 6: p i n o u t 1 2 3 4 5 14 13 12 11 10 9 8 top view see case s for dimensions. pin out pin s ingle output dual output t riple output 1 vin vin vin 2 vin return vin return vin return 3 inhibit inhibit inhibit 4 sync in sync in sync in 5 sync return sync return sync return 8 sense sense a trim b 9 sense return sense a return vout b negative 10 vout a return 1 vout a return vout b return 11 vout a 1 vout a vout b positive 12 trim trim b trim a 13 vout a 1 vout b vout a 14 vout a return 1 vout b return vout a return 1. to meet specifications for single output models, vout a pins (11 and 13) must be tied together and vout a return pins (10 and 14) must be tied together. pins not in use inhibit: single, dual and triple leave unconnected sync in connect to sync return sense lines must be connected to appropriate outputs trim (all) leave unconnected crane aerospace & electronics power solutions www.craneae.com/interpoint page 8 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
model numberi ng key smrt 28 515 t / k f base model input voltage output voltage screening radiation hardness assurance (rha) number of outputs (s=single, d=dual, t=triple) (single or dual vout for single or dual models main and aux. vout for triple models) smd numbers 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 (sm d) smrt 28 s imi l a r p a r t 5962f0622001kxc smrt283r3s/kf 5962f0622101kxc smrt2805s/kf 5962f0821001kxc smrt2812s/kf 5962f0622201kxc smrt2815s/kf 5962f0622301kxc smrt2805d/kf 5962f0720201kxc smrt2812d/kf 5962f0622401kxc smrt2815d/kf 5962f0821101kxc smrt283r312t/kf 5962f0821201kxc smrt283r315t/kf 5962f0622501kxc smrt28512t/kf 5962f0622601kxc smrt28515t/kf the smd number shown is for class k screening and radiation hardness assurance (rha) level f. see the smd for the numbers for other screening and radiation levels. for exact specifications for an smd product, refer to the smd drawing. smds can be downloaded from: http://www.dscc.dla.mil/programs/smcr model selection o n t h e l i n e s b e l o w , e n t e r o n e s e l e c t i o n f r o m e a c h c a t e g o r y t o d e t e r m i n e t h e m o d e l n u m b e r . c atego ry smrt28 / _______ base model and input voltage output voltage 1 n umber of outputs 2 screening 3 rha 4 selection smrt28 is the only available selection 3r 3, 05, 8r 7, 12, 15 s o o 05, 12, 15 d h p 3r 312, 3r315, t k r 507, 512, 515 f notes: 1. output voltage: an r indicates a decimal point. 3r3 is 3.3 volts out. the 3r3 output voltage is only available in single and triple output models. the 3r312 and 3r315 triple output converters are +3.3 volt main and 12 or 15 volt auxiliaries. 512 and 515 triple output converters are +5 volt main and 12 or 15 volt auxiliaries. 2. n umber of outputs: s is a single output, d is a dual output, and t is a triple output 3. screening: a screening level of o is a space prototype and is only used with rha o. see screening tables 2 and 3 for more information. 4. rha: 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. rha o is only available with screening level o. see screening table 3 for more information. crane aerospace & electronics power solutions www.craneae.com/interpoint page 9 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
electrical characteristics: -55c to +125c t c , 28 vdc vin, 100% load, unless otherwise specified. notes 1. g uaranteed by design, not tested. 2 . to maintain tight regulation over the full input voltage range a minimum load of 2% of full load should be used on all outputs. 3. converters meet mil-std-461 specification revisions for conducted emissions c-ce03 and d-/e-/f-ce-102. the actual value of input ripple current is much less, the limit in the characteristic table is based on measurement resolution.. 4. maximum power dissipation when output is shorted. 5. recovery time is measured from application of the transient to point at which v out is within 1% of v out at final value. 6. transition time > 10 s. 7. half load to/from full load. 8. measured from release of inhibit or input voltage step single output models smrt283r3s smrt2805s smrt288r7s units parameter conditions min typ max min typ max min typ max output voltage 3.23 3.30 3.37 4.90 5.00 5.10 8.52 8.70 8.87 vdc output current 2 0 6.97 0 6.0 0 4.0 a output power 2 v in = 19 t o 56 vdc 0 23 0 30 0 35 w output ripple 10 k h z - 20 mh z 280 200 200 mv p-p line regulation 2 v in = 19, 50 vdc 5 30 5 30 5 30 mv load regulation 5 40 5 40 5 80 mv v in = 19, 50 90 70 80 total regulation 1 v out all condition s of line, load, aging, temp and radiation 3.0 3.6 4.7 5.3 8.3 9.1 vdc input voltage continuous 19 28 56 19 28 56 19 28 56 vdc transient 1 120 ms 0 80 0 80 0 80 v input current inhibited 50 50 50 ma no load 110 110 115 input ripple current 3 10 khz - 20 mhz 10 50 10 50 10 50 ma p-p efficiency 60 66 72 % loa d fault 4, 5 power dissipation 31 28 25 w recovery 1 25 25 25 ms step load response 5, 6, 7 transient 450 450 450 mv pk recovery 3 3 4 ms step line response 1, 5, 6 19 - 50 - 19 v in transient 500 500 500 mv pk recovery 4 4 4 ms start-up 8 delay no load an d full 35 25 60 ms overshoot 50 50 95 mv pk capacitive load 1 t c = 25c unconditionally stable , start-up delay increased 5000 5000 5000 f crane aerospace & electronics power solutions www.craneae.com/interpoint page 10 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
electrical characteristics: -55c to +125c t c , 28 vdc vin, 100% load, unless otherwise specified. single output models smrt2812s smrt2815s units parameter conditions min typ max min typ max output voltage 11.76 12.00 12.24 14.70 15.00 15.30 vdc output current 2 2.92 2.33 a output power 2 v in = 19 t o 56 vdc 0 35 0 35 w output ripple 10 k h z - 20 mh z 200 180 mv p-p line regulation 2 v in = 19, 50 vdc 5 30 5 30 mv load regulation 5 40 5 40 mv v in = 19, 50 vdc 90 90 total regulation 1 v out all condition s of line, load, aging, temp and radiation 10.9 13.1 14.0 16.0 vdc input voltage continuous 19 28 56 19 28 56 vdc transient 1 120 ms 0 80 0 80 v input current inhibited 50 50 ma no load 110 110 input ripple current 3 10 khz - 20 mhz 10 50 10 50 ma p-p efficiency 75 75 % loa d fault 4, 5 power dissipation 20 20 w recovery 1 25 25 ms step load response 5, 6, 7 transient 575 575 mv pk recovery 3 3 ms step line response 1, 5, 6 19 - 50 - 19 v in transient 700 700 mv pk recovery 4 4 ms start-up 8 delay no load an d full 25 25 ms overshoot 120 150 mv pk capacitive load 1 t c = 25c unconditionally stable , start-up delay increased 5000 5000 f notes 1. g uaranteed by design, not tested. 2 . to maintain tight regulation over the full input voltage range a minimum load of 2% of full load should be used on all outputs. 3. converters meet mil-std-461 specification revisions for conducted emissions c-ce03 and d-/e-/f-ce-102. the actual value of input ripple current is much less, the limit in the characteristic table is based on measurement resolution.. 4. maximum power dissipation when output is shorted. 5. recovery time is measured from application of the transient to point at which v out is within 1% of v out at final value. 6. transition time > 10 s. 7. half load to/from full load. 8. measured from release of inhibit or input voltage step crane aerospace & electronics power solutions www.craneae.com/interpoint page 11 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
electrical characteristics: -55c to +125c t c , 28 vdc vin, 100% load, unless otherwise specified. dual output models smrt2805d smrt2812d smrt2815d units parameter conditions min typ max min typ max min typ max output voltage v o u t a 4.90 5.00 5.10 11.76 12.00 12.24 14.70 15.00 15.30 vdc v o u t b 4.90 5.00 5.10 11.76 12.00 12.24 14.70 15.00 15.30 output current 2, 3 v o u t a 3.0 1.46 1.17 v o u t b 3.0 1.46 1.17 a output power 2, 3 v i n = 19 t o 56 vdc v o u t a 0 15 0 17.5 0 17.5 w v o u t b 0 15 0 17.5 0 17.5 output ripple 10 k h z - 20 mh z 200 200 180 mv p-p line regulation 2 v in = 19, 50 vdc 30 5 25 5 30 mv load regulation 5 40 5 50 5 40 mv v in = 19, 50 vdc 70 100 70 total regulation 1 v out all condition s of line, load, aging, temp and radiation 4.6 5.4 10.9 13.1 14.0 16.0 vdc input voltage 4 continuous 19 28 56 19 28 56 19 28 56 vdc transient 120 ms 0 80 0 80 0 80 v input current inhibited 4 50 50 50 ma no load 110 110 110 input ripple current 4 10 khz - 20 mhz 10 50 10 150 10 50 ma p-p efficiency 66 75 75 % loa d fault 5, 6 power dissipation 28 20 20 w recovery 1 25 25 25 ms step load response 6, 7, 8 transient 450 450 575 mv pk recovery 3 2 3 ms step line response 1, 6, 7 19 - 50 - 19 v in transient 500 1000 700 mv pk recovery 4 3 4 ms start-up 9 delay no load an d full 25 20 25 ms overshoot 50 350 150 mv pk capacitive load 1 t c = 25c unconditionally stable , start-up delay increased 5000 5000 5000 f notes 1. g uaranteed by design, not tested. 2. the specified maximum current/power is available from each output. 3. to maintain tight regulation over the full input voltage range a minimum load of 2% of full load should be used on all outputs. 4. converters meet mil-std-461 specification revisions for conducted emissions c-ce03 and d-/e-/f-ce-102. the actual value of input ripple current is much less, the limit in the characteristic table is based on measurement resolution.. 5. maximum power dissipation when output is shorted. 6. recovery time is measured from application of the transient to point at which v out is within 1% of v out at final value. 7. transition time > 10 s. 8. half load to/from full load. 9. measured from release of inhibit or input voltage step crane aerospace & electronics power solutions www.craneae.com/interpoint page 12 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
triple output model C smrt283r312t 3.3 (m ain) 12 (a uxiliaries) units parameter conditions min typ max min typ max output voltage main and pos . aux 3.23 3.30 3.37 11.76 12.00 12.24 vdc ne g. aux. -11.58 -12.00 -12.42 output current 2, 3 4.5 0 0.63 1 1 a total 1.25 output power 2, 3 0 15 0 7.5 12 1 w v in = 19 t o 56 vdc total 15 output ripple 10 k h z - 20 mh z 200 150 mv p-p line regulation main and pos. aux 30 5 30 mv v in = 19, 50 vdc ne g. aux. 10 70 load regulation main and pos . aux 5 40 5 40 v in = 19, 50 vdc 100 120 ne g. aux. 1 10 300 mv v in = 19, 50 vdc 1 400 total regulation 1 v out all condition s of line, load, aging, temp and radiation 3.0 3.6 10.9 13.1 vdc cross regulation 1, 4, 5 t c = 25c e ffect on negative auxiliary 2.5 % input voltage continuous 19 28 56 vdc transient 120 ms 0 80 v input current no load 110 ma inhibited 50 input ripple current 6 10 khz - 10 mhz 10 50 ma p-p efficiency 7 68 % loa d fault 8, 9 power dissipation 28 w recovery 1 25 25 ms step load response 9, 10, 11 transient 450 450 mv pk recovery 3 3 ms step line response 1, 8, 9 19 - 50 - 19 v in transient 500 750 mv pk recovery 4 4 ms start-up 11 delay no load an d full 35 25 ms overshoot 0 50 0 120 mv pk capacitive load 1 t c = 25c unconditionally stable , start-up delay increased 5000 1000 f n otes: see page 15 electrical characteristics: -55c to +125c t c , 28 vdc vin, 100% load, unless otherwise specified. crane aerospace & electronics power solutions www.craneae.com/interpoint page 13 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
electrical characteristics: -55c to +125c t c , 28 vdc vin, 100% load, unless otherwise specified. n otes: see page 15 triple output model C smrt283r315t 3.3 (m ain) 15 (a uxiliaries) units parameter conditions min typ max min typ max output voltage main and pos . aux 3.23 3.30 3.37 14.70 15.00 15.30 vdc ne g. aux. -14.48 -15.00 -15.53 output current 2, 3 4.5 0 0.5 0.8 1 a total 1.0 output power 2, 3 0 15 0 7.5 12 1 w v in = 19 t o 56 vdc total 15 output ripple 10 k h z - 20 mh z 200 150 mv p-p line regulation main and pos. aux 30 5 30 mv v in = 19, 50 vdc ne g. aux. 10 70 load regulation main and pos . aux 5 40 5 40 v in = 19, 50 vdc 100 120 ne g. aux. 1 300 mv v in = 19, 50 vdc 1 400 total regulation 1 v out all condition s of line, load, aging, temp and radiation 3.0 3.6 14.0 16.0 vdc cross regulation 1, 4, 5 t c = 25c e ffect on negative auxiliary 2.5 % input voltage continuous 19 28 56 vdc transient 120 ms 0 80 v input current no load 110 ma inhibited 50 input ripple current 6 10 khz - 10 mhz 10 50 ma p-p efficiency 7 68 % loa d fault 8, 9 power dissipation 28 w recovery 1 25 25 ms step load response 9, 10, 11 transient 450 450 mv pk recovery 3 3 ms step line response 1, 8, 9 19 - 50 - 19 v in transient 500 750 mv pk recovery 4 4 ms start-up 11 delay no load an d full 35 25 ms overshoot 0 50 0 150 mv pk capacitive load 1 t c = 25c unconditionally stable , start-up delay increased 5000 1000 f crane aerospace & electronics power solutions www.craneae.com/interpoint page 14 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
n otes: see page 15 triple output model C smrt28507t 5 (m ain) 7 (a uxiliaries) units parameter conditions min typ max min typ max output voltage main and pos . aux 4.90 5.00 5.10 6.86 7.00 7.14 vdc ne g. aux. -6.79 7.00 -7.21 output current 2, 3 3.0 0 1.00 1.2 1 a total 2.0 output power 2, 3 0 15 0 7.0 11.2 1 w v in = 19 t o 56 vdc total 14 output ripple 10 k h z - 20 mh z 230 170 mv p-p line regulation main and pos. aux 70 100 mv v in = 19, 50 vdc ne g. aux. 150 load regulation main and pos . aux 5 100 5 250 v in = 19, 50 vdc 150 250 ne g. aux. 1 350 mv v in = 19, 50 vdc 1 350 total regulation 1 v out all condition s of line, load, aging, temp and radiation 4.7 5.3 6.53 7.47 vdc cross regulation 1, 4, 5 t c = 25c e ffect on negative auxiliary 2.5 % input voltage continuous 19 28 56 vdc transient 120 ms 0 80 v input current no load 110 ma inhibited 50 input ripple current 6 10 khz - 10 mhz 10 50 ma p-p efficiency 7 71 % loa d fault 8, 9 power dissipation 22 w recovery 1 25 25 ms step load response 9, 10, 11 transient 300 400 mv pk recovery 2 2 ms step line response 1, 8, 9 19 - 50 - 19 v in transient 500 750 mv pk recovery 4 4 ms start-up 11 delay no load an d full 20 20 ms overshoot 0 100 0 150 mv pk capacitive load 1 t c = 25c unconditionally stable , start-up delay increased 5000 1000 f electrical characteristics: -55c to +125c t c , 28 vdc vin, 100% load, unless otherwise specified. crane aerospace & electronics power solutions www.craneae.com/interpoint page 15 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
n otes: see page 15 triple output model C smrt28512t 5 (m ain) 12 (a uxiliaries) units parameter conditions min typ max min typ max output voltage main and pos . aux 4.90 5.00 5.10 11.76 12.00 12.24 vdc ne g. aux. -11.58 -12.00 -12.42 output current 2, 3 3.0 0 0.63 1 1 a max t otal aux 1.25 output power 2, 3 0 15 0 7.5 12 1 w v in = 19 t o 56 vdc max t otal aux 15 output ripple 10 k h z - 20 mh z 200 150 mv p-p line regulation main and pos. aux 30 5 30 mv v in = 19, 50 vdc ne g. aux. 20 70 load regulation main and pos . aux 5 40 5 40 v in = 19, 50 vdc 100 120 ne g. aux. 1 10 300 mv v in = 19, 50 vdc 1 400 total regulation 1 v out all condition s of line, load, aging, temp and radiation 4.7 5.3 10.9 13.1 vdc cross regulation 1, 4, 5 t c = 25c e ffect on negative auxiliary 2.5 % input voltage continuous 19 28 56 vdc transient 120 ms 0 80 v input current no load 110 ma inhibited 50 input ripple current 6 10 khz - 10 mhz 10 50 ma p-p efficiency 7 68 % loa d fault 8, 9 power dissipation 25 w recovery 1 25 25 ms step load response 9, 10, 11 transient 450 450 mv pk recovery 3 3 ms step line response 1, 8, 9 19 - 50 - 19 v in transient 500 750 mv pk recovery 4 4 ms start-up 11 delay no load an d full 25 25 ms overshoot 0 50 0 120 mv pk capacitive load 1 t c = 25c unconditionally stable , start-up delay increased 5000 1000 f electrical characteristics: -55c to +125c t c , 28 vdc vin, 100% load, unless otherwise specified. crane aerospace & electronics power solutions www.craneae.com/interpoint page 16 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
electrical characteristics: -55c to +125c t c , 28 vdc vin, 100% load, unless otherwise specified. n otes: see page 15 triple output model C smrt28515t 5 (m ain) 15 (a uxiliaries) units parameter conditions min typ max min typ max output voltage main and pos . aux 4.92 5.00 5.08 14.77 15.00 15.23 vdc ne g. aux. -14.70 -15.00 -15.30 output current 2, 3 3.0 0 0.5 0.80 1 a max t otal aux. 1 output power 2, 3 0 15 0 7.5 11.25 1 w v in = 19 t o 56 vdc max t otal aux 15 output ripple 10 k h z - 20 mh z 200 200 mv p-p line regulation main and pos. aux 5 25 25 mv v in = 19, 50 vdc ne g. aux. 20 35 load regulation main and pos . aux 5 50 5 50 v in = 19, 50 vdc 100 120 ne g. aux. 1 500 mv v in = 19, 50 vdc 1 600 total regulation 1 v out all condition s of line, load, aging, temp and radiation 4.7 5.3 14.0 16.0 vdc cross regulation 1, 4, 5 t c = 25c e ffect on negative auxiliary 2.5 % input voltage continuous 19 28 56 vdc transient 120 ms 0 80 v input current no load 110 ma inhibited 50 input ripple current 6 10 khz - 10 mhz 10 150 ma p-p efficiency 7 70 % loa d fault 8, 9 power dissipation 25 w recovery 1 35 35 ms step load response 9, 10, 11 transient 250 350 mv pk recovery 1 1 ms step line response 1, 8, 9 19 - 50 - 19 v in transient 500 750 mv pk recovery 1.5 1.5 ms start-up 11 delay no load an d full 25 20 ms overshoot 0 200 0 350 mv pk capacitive load 1 t c = 25c unconditionally stable , start-up delay increased 5000 1000 f crane aerospace & electronics power solutions www.craneae.com/interpoint page 17 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
notes: triple output models 1. g uaranteed by design, not tested. 2. up to the maximum specified auxiliary output current/power is available from either auxiliary output provided the total auxiliary output current/ power does not exceed the total current/power specified . 3. to maintain tight regulation over the full input voltage range a minimum load of 2% of full load should be used on all outputs. 4. to maintain the cross regulation specification, one of the auxiliaries must always provide a minimum of 20% of the total auxiliary power used. n egative vout cross regulation is referenced to 50%/50% balanced loads (at 100% of total rated output power - full load). 5. cross regulation is measured under the following conditions: condition 1: +p out = 20 - 80%,/- p out = 80 - 20% condition 2: - p out = 20 - 80%, /+ p out = 80 - 20% 6. converters meet mil-std-461 specification revisions for conducted emissions c-ce03 and d-/e-/f-ce-102. the actual value of input ripple current is much less, the limit in the characteristic table is based on measurement resolution. 7. efficiency measured with all outputs at full load. 8. maximum power dissipation when all outputs are shorted simultaneously. 9. recovery time is measured from application of the transient to point at which v out is within 1% of v out at final value. 10. transition time > 10 s. 11. half load to/from full load. 12. measured from release of inhibit or input voltage step. electrical characteristics: -55c to +125c tc, 28 vdc vin, 100% load, unless otherwise specified. crane aerospace & electronics power solutions www.craneae.com/interpoint page 18 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
v out 1 v/div attenuation (db) v in 10 v/div C 0 v v in v out 5 ms/div representative of all models frequency (khz) representative of all models -100 0 0.03 0.10 1.0 10.0 f i g u r e 7: start-up delay smrt2853r315t, main v out (3.3 v) f i g u r e 8: audio rejection smrt2805s crane aerospace & electronics power solutions www.craneae.com/interpoint page 19 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
bottom view case s seal hole: 0.135 0.005 (3.43 0.13) angled corner indicates pin 1 6 x 0.135 (3.43) dia. 12 x 0.040 0.002 dia. (1.02 0.05) 1 2 3 4 5 14 13 12 1 1 10 9 8 1.700 (43.18) 1.500 (38.10) 1.300 (33.02) 1.100 (27.94) 0.900 (22.86) 0.700 (17.78) 0.500 (12.70) 3x 2.075 (52.68) 3x 0.125 (3.15) 2x 0.150 (3.81) 0.00 0.00 2x 2.550 (64.77) 12 x 0.270 max (6.86) 2x 1.550 (39.37) 0.00 materials header cold rolled steel/nickel cover kovar/nickel pins #52 alloy/gold, ceramic seal case s, rev c, 20091020 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. 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 300c for 10 seconds per pin 2.705 max (68.71) 0.262 (6.65) 1.675 (42.5) 2.205 max (56.01) 0.220 (5.59) 0.050 (1.27) 0.400 max (10.16) f i g u r e 9: c a s e s crane aerospace & electronics power solutions page 20 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24 www.craneae.com/interpoint
s c r e e n i n g t a b l e 1: e l e m e n t e v a l u a t i o n mil-prf-38534 e l e m e n t e v a l u a t i o n c o m p o n e n t -l e v e l t e s t p e r f o r m e d s p a c e p r o t o t y p e (o) 1 n o n -qml /h c l a s s h qml /k c l a s s k qml m/s 2, 3 m/s 2 p 3 m/s 2 p 3 element electrical n n n n n visual n n n n internal visual n n temperature cycling n n constant acceleration n n interim electrical n burn-in n post burn-in electrical n steady state life n voltage conditioning aging n visual inspection n final electrical n n n n wire bond evaluation n n n n sem n c-sam: input capacitors only addl test, not req. by h or k n n notes: 1. n on-qml products may not meet all of the requirements of mil-prf-38534. 2. m/s = active components (microcircuit and semiconductor die) 3. p = passive components, class h and k element evaluation. n ot applicable to space prototype (o) element evaluation. definitions: element evaluation: component testing/screening per mil-std-883 as determined by mil-prf-38534 sem: scanning electron microscopy c-sam: c - mode scanning acoustic microscopy crane aerospace & electronics power solutions www.craneae.com/interpoint page 21 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified smrt28 rev f - 2011.01.24
s c r e e n i n g t a b l e 2: e n v i r o n m e n t a l s c r e e n i n g crane aerospace & electronics power solutions smrt28 single, dual and triple smrt28 rev f - 2011.01.24. this revision supersedes all previous releases. all technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. crane electronics, inc reserves the right to make changes in products or speci - fications without notice. smrt series is a trademark of crane electronics, inc. copyright ? 1999 - 2011 crane electronics, inc. all rights reserved. www.craneae.com/interpoint page 22 of 22 smrt28 s ingle, dual and triple s pace dc/dc converters 28 v olt i nput C 35 watt C s pace qualified 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 a n d rha 1 non-qml 2 qml 3 c l a s s h c l a s s k t e s t p e r f o r m e d /oo /hp /hr /kp /kr /kf n on-destruct bond pull, method 2023 n 4 n 4 n n n pre-cap inspection, method 2017, 2032 n n n n n n temperature cycle (10 times) method 1010, cond. c, -65c to +150c, ambient n n n n n n constant acceleration method 2001, 3000 g (qual 5000 g) n n n n n n pin d, test method 2020, cond. a ? ? ? n 4 ? ? ? n 4 n n n pre burn-in test, g roup a, subgroups 1 and 4 n n n n n n burn-in method 1015, +125c case, typical 5 96 hours n 160 hours n n 2 x 160 hours (includes mid-bi test) n n n final electrical test, mil-prf-38534, g roup a, subgroups 1 through 6, -55c, +25c, +125c case n n n n n n hermeticity test g ross leak, method 1014, cond. c n n n n n n fine leak, method 1014, cond. a n n n n n n radiography, method 2012 n n n post radiography electrical test, +25c case ? ? ? n 4 ? ? ? n 4 ? ? ? n 4 final visual inspection, method 2009 n n n n n n rha p: 30 krad(si) total dose 6 n n rha r: 100 krad(si) total dose 6 n n rha f: 300 krad(si) total dose 6 n see let 85 mev-cm 2 /mg 7 n n n n n test methods are referenced to mil-std-883 as determined by mil-prf-38534. notes: 1. redmond site, interpoint brand, has a dscc approved radiation hardness assurance plan. our smd products with rha p, r or f code met dscc requirements. 2. space prototypes are non-qml products and may not meet all of the require - ments of mil-prf-38534. o in the rha designator position in interpoint model numbers indicates dscc rha - defined as no rha. 3. all processes are qml qualified and performed by certified operators. 4. n ot required by dscc but performed to assure product quality. 5. burn-in temperature designed to bring the case temperature to +125c minimum. 6. high dose rate testing. 7. n o upset at the pins.

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