models vdc o utput 1 size (max): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) case u w eight: 100 grams maximum screening: standard, es, or 883 (class h). single 5 12 15 28 dual ? ?2 ?5 description the mfl series 28-volt dc/dc converters are rated up to 65 watts of output power over a ?5? to +125? 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 output. current sharing allows the units to be paralleled for total power of up to 148watts. the welded, hermetically sealed package is only 3.005 x 1.505 x 0.400 inches, giving the series an overall power density of up to 43 watts per cubic inch. d esign f eatures the mfl 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 trans- former in the forward path and a wide bandwidth magnetic coupling in the feedback control loop. the mfl uses a unique dual loop feed- back technique that controls output current with an inner feedback 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 cascaded constant frequency, pulse-width modulated converters use a quasi-square wave single-ended forward design. t ight load regulation is achieved through a wide-bandwidth magnetic feedback circuit. the output on single mfl models can be trimmed (see figure 1 for voltage changes with different resistor values). i nhibit the mfl series converters have two ttl compatible inhibit termi- nals (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. an open collector ttl compatible low (<0.8 volts) is required to inhibit the converter between inh1 (pin 4) and input common (pin 2). an open collector ttl compatible 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. c urrent and p arallel o peration multiple mfl converters may be used in parallel to drive a common load (see figure 2). in this mode of operation the load current is shared by two or three mfl converters. in current sharing mode, one mfl converter is designated as a master. the slave pin (pin 1 1) 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). figure 2 shows the typical setup for two or three units in parallel. note that synchro- nizing 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 mfl converters are available at the load. overload and short circuit performance are not adversely affected during parallel operation. dc/dc c onverters 28 v olt i nput mfl series 65 watt f eatures ?5 to +125? operation 16 to 40 vdc input fully isolated magnetic feedback fixed frequency, 600 khz typical ? opology ?single ended forward 50 v for up to 50 ms transient protection inhibit (input & output side) sync function (in and out) output trim on single output models indefinite short circuit protection remote sense on single output models up to 87% efficiency / 43 w/in 3 parallelable up to 148 watts
typical characteristics sync and inhibit (inh1, inh2) recommended operating conditions absolute maximum ratings input voltage 16 to 40 vdc power dissipation (pd) 14 watts (16 watts mfl2805s, mfl2805d) output power 50 to 65 watts depending on model lead soldering temperature (10 sec per lead) 300? storage temperature range (case) ?5? to +150? 2 mfl series 65 watt dc/dc c onverters output voltage temperature coefficient ? 00 ppm/? typical input to output capacitance 150 pf, typical isolation 100 megohm minimum at 500 v 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 input voltage range 16 to 40 vdc continuous 50 v for 120 msec transient case operating temperature (tc) ?5? to +125? full power ?5? to +135? absolute derate output power/current linearly from 100% at 125? to 0% at 135? electrical characteristics: ?5? to +125 c 1 t c, 28 vdc vin, 100% load, free run, unless otherwise specified. sync in (525 to 675 khz) duty cycle 40% min, 60% max logic low 0.8 v max logic high 4.5 v min, 9 v max referenced to input common if not used, connect to input common sync out referenced to input common inhibit (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 notes 1. mfl2828s specifiications are at 25?c, contact your interpoint repre- sentative for more information. 2. unit will shut down above approximately 45v but will be undamaged and will restart when voltage drops into normal range. 3. indefinite short circuit protection not guaranteed above 125? case. 4. recovery time is measured from application of the transient to point at which vout is within 1% of final value. 5. transition time 10 ?. single output models mfl2805s mfl2812s mfl2815s mfl2828s 1 p arameter condition min typ max min typ max min typ max min typ max 1 units output voltage tc = 25? 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 27.72 28.00 28.28 vdc output current v in = 16 to 40 vdc 0 10 0 5 0 4.33 0 2.32 a output power v in = 16 to 40 vdc 0 50 0 60 0 65 0 65 w output ripple tc = 25? 15 35 30 75 30 85 100 200 voltage 10 k - 2 mhz tc = ?5? to +125? 30 50 45 100 45 110 mv p-p line regulation v in = 16 to 40 vdc 0 20 0 20 0 20 20 60 mv load regulation no load to full 0 20 0 20 0 20 20 75 mv input voltage continuous 16 28 40 16 28 40 16 28 40 16 28 40 vdc no load to full transient 2 50 ms 50 50 50 50 v input current no load 70 120 50 80 50 80 60 100 ma full load 2.5 2.8 3.0 2.8 a inhibited - inh1 9 14 9 14 9 14 9 14 ma inhibited - inh2 35 70 35 70 35 70 35 70 input ripple current 10 khz - 10 mhz 15 50 15 50 15 50 20 50 ma pp efficiency tc = 25? 77 80 83 86 84 87 83 86 % load fault 3 power dissipation short circuit tc = 25? 12.5 16 10 14 10 14 7 14 a recovery 1.5 4 1.5 4 1.5 4 1.0 4 ms step load resp. 50% ?100% ?50% transient 250 350 450 600 500 600 800 1400 mv pk recovery 4 1.5 3.0 1.5 3.0 1.5 3.0 1.5 3.0 ms step line resp. 16 ?40 ?16 vdc transient 5 250 300 250 400 250 400 250 800 mv pk recovery 4 200 300 200 300 200 300 200 400 ? start-up delay 3.5 6 3.5 6 3.5 6 3.5 6 ms overshoot 0 25 0 50 0 50 0 100 mv pk pins not used tr1, master, and slave if not used, leave unconnected
3 mfl series 65 watt dc/dc c onverters electrical characteristics: ?5? to +125? tc, 28 vdc vin, 100% load, free run, unless otherwise specified. dual output models mfl2805d mfl2812d mfl2815d p arameter conditions min typ max min typ max min typ max units output voltage tc = 25? +v out 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 vdc ? out 4.92 5.00 5.08 11.82 12.00 12.18 14.77 15.00 15.23 output current 1 each output 0 7 0 3.5 0 3.03 a v in = 16 to 40 vdc total output 0 10 0 5 0 4.34 output power v in = 16 to 40 vdc 0 50 0 60 0 65 w output ripple voltage +/?v out 10 khz - 2 mhz 50 100 50 120 50 150 mv p-p line regulation +v out ?50 ? 50 0 50 mv v in = 16 to 40 vdc ? out ?5100 ?5 100 25 100 load regulation +v out ?50 10 100 10 100 mv no load to full ? out ?5100 ?0 120 50 150 cross regulation see note 2 5 8 2 4 2 4 % tc = 25? see note 3 3 6 2 4 2 4 input voltage continuous 16 28 40 16 28 40 16 28 40 vdc no load to full transient 4 50 ms. 0 50 0 ?0 0 50 v input current no load 50 120 50 100 50 100 ma tc = 25? full load 2.80 3.00 a inhibited - inh1 9 14 9 14 9 14 ma inhibited - inh2 35 70 35 70 35 70 input ripple current 10 khz - 10 mhz 15 50 15 50 15 50 ma p-p efficiency 25? tc balanced load 77 80 83 86 84 87 % load fault 5 power dissipation tc = 25? short circuit 12.5 16 10 14 10 14 w recovery 1.5 4.0 1.5 4.0 1.5 4.0 ms step load 50 %?00%?50% load response v out transient 250 350 450 600 500 600 mv pk recovery 6 1.5 3.0 1.5 3.0 1.5 3.0 ms step line 16 ?40 ?16 v in response v out transient 7 250 300 250 400 250 400 mv pk recovery 6 200 300 200 300 200 300 ? start?p delay 3.5 6 3.5 6 3.5 6 ms overshoot 0 25 0 50 0 50 mv p notes 1. 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. 2. effect on the negative output under the following conditions: +p out 30% to 70%; ? out 70% to 30% 3. effect on the negative output under the following conditions: +p out 50%; ? out 10% to 50% 4. unit will shut down above approximately 45v but will be undamaged and will restart when voltage drops into normal range. 5. indefinite short circuit protection not guaranteed above 125? case. 6. recovery time is measured from application of the transient to point at which v out is within 1% of final value. 7. transition time 10 ?.
4 mfl series 65 watt dc/dc c onverters 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 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 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 1: s ense c onnections and t rim t able f igure 2: p arallel c onnections
pin out smd numbers mfl 28 05 s / es base model input voltage output voltage screening number of outputs (s = single, d = dual) (standard screening has no designator in this position.) angled corner indicates pin one. 1 2 3 4 5 6 12 11 10 9 8 7 to p view mfl (pin side, marked side) 5 mfl series 65 watt dc/dc c onverters model numbering key pin single output mfl2828s dual output 1 positive input positive input positive input 2i nput common input common input common 3t riple (tri) triple (tri) triple (tri) 4 inhibit 1 (inh1) inhibit 1 (inh1) inhibit 1 (inh1) 5 sync out sync out sync out 6 sync in sync in sync in 7 positive output positive output positive output 8 output common no connection output common 9 sense return output common negative output 10 positive sense no connection no connection 11 slave slave slave 12 master/ inhibit 2 master/ inhibit 2 master / inhibit 2 pin 6 should be connected to input common if external sync (sync in) is not used. sense pins must be connected to their respective outputs if not used. s t andard m icrocircuit d rawing (smd) 5962-9316301hxc 5962-9316201hxc 5962-9316101hxc in process 5962-9319101hxc 5962-9319201hxc 5962-9319301hxc mfl s eries s imilar p art mfl2805s/883 mfl2812s/883 mfl2815s/883 mfl2828s/883 mfl2805d/883 mfl2812d/883 mfl2815d/883 for exact specifications for an smd product, refer to the smd drawing. see section a3, smds, for more information. t ypical performance curves: 25? tc , 28 vdc vin, 100% load, free run, unless otherwise specified. output (watts) mfl2805s & mfl2805d efficiency efficiency (%) 60 90 85 80 75 70 10 20 30 40 50 28v 40v 65 16v f igure 4 output power (watts) mfl2812s & mfl2812d efficiency efficiency (%) 60 90 85 80 75 70 10 20 30 40 50 60 40v 16v 28v 65 f igure 5 f igure 6 60 90 85 80 75 70 10 20 30 40 50 65 60 65 16v output power (watts) mfl2815s & mfl2815d efficiency efficiency (%) 40v 28v see section b8, case u1, for dimensions. f igure 3: p in o ut
6 mfl series 65 watt dc/dc c onverters t ypical performance curves: 25? tc , 28 vdc vin, 100% load, free run, unless otherwise specified. f igure 7 f igure 9 60 65 70 75 80 85 90 0102030405060 70 40 v in 16 v in 28 v in output power (watts) mfl2828s efficiency efficiency (%) 50 s/div 16 to 40 v mfl2805s step line response 100mv/div. 20v/div. vout vin 0.1 0. 20. 40. 60. 80. 100. attenuation (db) frequency (khz) mfl series audio rejection 110 100 f igure 8 f igure 13 f igure 15 1ms/div mfl2815d step load response 200mv/div. 100% to 50% 50% to 100% ?out = 32.5w 0 30 40 50 60 ?8 ?6 ?4 ?2 2 4 6 8 mfl2812d mfl2805d 70 mfl2815d output load (%) +pout 80 to 20 %, ?out 20 to 80% cross regulation ?out voltage change (%) 100mv/div. 100% to 50% 50% to 100% 1ms/div mfl2805s step load response f igure 10 1ms/div no load mfl2805s turn on response 1v/div. 20v/div. vin v out f igure 11 5v/div. 20v/div. v in ?out +vout 1ms/div no load mfl2815d turn on response f igure 14 f igure 12 50 s/div 16 to 40 v mfl2815d step line response 100mv/div. +vout ?out vin 20v/div. f igure 16 10 20 30 40 50 60 11 15 14 13 12 65 16 mfl2815s & 15d mfl2805s & 5d output power (watts) low line dropout input voltage (volts) mfl2812s & 12d
7 mfl series 65 watt dc/dc c onverters materials header cold rolled steel/nickel/gold cover kovar/nickel pins #52 alloy/gold compression glass seal case u to p view (pin side) see figure 18 for dimensions 1.505 max (38.23) 3.005 (76.33) max. angled corner indicates pin one f igure 17: c ase u m aximum d imensions 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. case dimensions in inches (mm) t olerance ?.005 (0.13) for three decimal places, ?.01 (0.2) for two decimal places unless otherwise specified although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. please refer to the numerical dimensions for accuracy. 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 0.410 (10.41) max. 0.220 (5.59 seam seal top view case u f igure 18: c ase u
8 mfl series 65 watt dc/dc c onverters test standard /es /883 (class h)* pre-cap inspection method 2017, 2032 yes yes yes temperature cycle (10 times) method 1010, cond. c, -65?c to 150?c no no yes method 1010, cond. b, -55?c to 125?c no yes no constant acceleration method 2001, 3000 g no no yes method 2001, 500 g no yes no burn-in method 1015, 160 hours at 125?c no no yes 96 hours at 125?c case (typical) no yes no final electrical test mil-prf-38534, group a subgroups 1 through 6: -55?c, +25?c, +125?c no no yes subgroups 1 and 4: +25?c case yes yes no hermeticity testing fine leak, method 1014, cond. a no yes yes gross leak, method 1014, cond. c no yes yes gross leak, dip (1 x 10 -3 ) yes no no final visual inspection method 2009 yes yes yes t est methods are referenced to mil-std-883 as determined by mil-prf-38534. *883 products are built with element evaluated components and are 100% tested and guaranteed over the full military temperature range of e55?c to +125?c. e nvironmental s creening 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 20022-001-dts rev b 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. mfl series is a trademark of interpoint. copyright 1994 - 2003 interpoint. all rights reserved.
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