models vdc o utput b4-9 size (max.): 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm) see section b8, case j5, for dimensions. weight: 60 grams max. screening: standard or es. see section c2 for screening options, see section a5 for ordering information. f eatures ?5? to +85? operation 18 to 40 vdc input (19 to 40 vdc mtw2805s) fully isolated optocoupler feedback fixed frequency topology ?push-pull forward 50 v for up to 50 ms transient protection inhibit function indefinite short circuit protection remote sense on mtw2805s model up to 86% efficiency single 5 12 15 dual ? 2 ? 5 description the mtw series of dc/dc converters offer the high efficiency and wide input voltage range of switching regulators with the isola- tion, excellent output regulation, and low output noise typical of linear regulators without requiring the use of external components. mtw converters are built using thick-film hybrid technology and are sealed in metal packages for military, aerospace and other high-reli- ability applications. unscreened models are sealed with solder and are guaranteed to pass a gross leak test (maximum leak rate of 1 x 10 -3 atm.-cc/sec). environmentally screened models (/es) are hermetically sealed with solder and will pass a fine leak and gross leak test as described in section c2. mtw converters use a constant frequency pulse-width modulated switching regulator design operating in the forward mode with a clock switching frequency of 240 to 300 khz. isolation is achieved through the use of a transformer in the forward power circuit and an optocoupler in the feedback control loop. the full load output power of 30 watts is available over the entire 18 to 40 vdc (19 to 40 vdc for mtw2805s) input range. on dual output models, up to 90% of full power is available from either output up to a combined total of 30 watts. input transients of 50 v to up to 50 ms. duration will not impair normal operation. efficiency is high over the entire input voltage range and from approximately 25% of full load to full load (see typical efficiency curves). mtw converters are provided with indefinite short circuit protection through the use of current limiting techniques. when the output current reaches approximately 125% of the full rated load, the output voltage begins to reduce to protect the converter. the converter can sustain a true short circuit condition indefinitely. with temperatures measured at the baseplate, the mtw series is rated for full power operation from ?5? to +85? with the power derated linearly to 0 at 115?. the mtw s flanged case facilitates removal of heat and provides for mechanically secure mounting.in applications requiring full power operation, an efficient heat sink attached to the baseplate is required. an inhibit is provided to allow power shut-down and start-up from a logic input. an open circuit on the inhibit pin allows normal operation, while a connection between the inhibit pin and input common disables the internal oscillator and shuts down the output. in the inhibit mode, approximately 1 ma must be sunk from pin the inhibit pin. an open collector, active low, is required to activate the inhibit function. all mtw converters are characterized by close output regulation over the entire operating range with no minimum power require- ment. on 12 and 15 vdc output models, typical line regulation is 10 to 20 mv. the mtw2805s model uses external remote sense pins which monitor the voltage at the load to provide typical regulation in the 5 to 7 mv range. the voltage sensing circuitry operates in a true four terminal voltage mode, eliminating the adverse effects of line resistance voltage drops. the remote sense pins may be left uncon- nected, but see cautions in on the following pages. for normal oper- ation, remote sense pins should be connected to their respective output pins. the mtw series offers low noise on both the input and output line. in the single output converters, two-section l-c filters at both the input and output limit output ripple voltage and minimize reflected ripple on the input line. a small value (1000 pf, 500 v) ceramic capacitor connected between the case and input common pin of the single volt output models will reduce emi on the input lines to levels near those required by mil-std-461c s ce03 standard. in the dual output converters, single-section l-c filters are used at the input and outputs. if compliance with mil-std-461 is necessary, use of interpoint s fma-416 emi filter or fm-704a transient suppressor is recommended. dc/dc c onverters 28 v olt i nput mtw series 30 watt
typical characteristics recommended operating conditions absolute maximum ratings inhibit input voltage 18 to 40 vdc (19 to 40 vdc mtw2805s) output power 30 watts lead soldering temperature (10 sec per lead) 300? storage temperature range (case) ?5? to +125? b4-10 mtw series 30 watt dc/dc c onverters output voltage temperature coefficient 100 ppm/?, typical input to output capacitance 80 pf typical single output models 70 pf typical mtw2812d 60 pf typical mtw2815d current limit 125% of full load typical isolation 100 megohm minimum at 500 v conversion frequency 240 to 300 khz inhibit pin voltage (unit enabled) 11 to 15 v single output models 8 to 12 v mtw2812d 10 to 14 v mtw2815d input voltage range 18 to 40 vdc continuous (19 to 40 mtw2805s) 50 v for 50 msec transient case operating temperature (tc) ?5? to +85? full power ?5? to +115? absolute derating output power/current linearly from 100% at 85? to 0% at 115 c inhibit ttl open collector logic low (output disabled) inhibit pin current 1 ma typical referenced to input common logic high (output enabled) open collector electrical characteristics: 25? tc, 28 vdc vin, 100% load, unless otherwise specified. mtw2805s mtw2812s mtw2815s parameter conditions min typ max min typ max min typ max units output voltage 4.95 5.0 5.05 11.88 12.0 12.12 14.85 15.0 15.15 vdc output current 6.0 2.5 2.0 a output power ?5? to +85? 30.0 30.0 30.0 w output ripple bw 2 mhz 30 50 30 65 30 65 mv p-p line regulation 1 min. to max. v in 7 20 10 25 10 25 mv load regulation 1 no load to full 5 20 10 20 10 20 mv input voltage no load to full 19 28 40 18 28 40 18 28 40 vdc ?5? to +85? transient 50 ms 50 50 50 input current no load 15 20 20 35 20 35 full load 1370 1400 1400 ma inhibited 15 22 22 input ripple current bw 2 mhz 5 10 10 20 10 20 ma p-p efficiency 80 82 82 84 84 86 % start-up delay 2 ?5 30 40 ms overshoot 300 400 400 mv notes 1. for mtw2805s, with the remote sense pins connected to the load and no resistance between the output pins and load. 2. a low output impedance power source is required on the input to realize this start-up time. if less than full surge current is available, start-up time will be longer caution permanent damage to the mtw2805s will result if pin 6 is shorted to ground. damage may also result if pin 4 or pin 5 is disconn ected from the load during operation with the remote sense leads connected to the load. if remote sense pins are not connected to the load, the out put voltage of the mtw2805s will rise to approximately 6.2 vdc measured across pins 4 and 5.
pin out b4-11 mtw series 30 watt dc/dc c onverters mtw2812d mtw2815d parameter condition min typ max min typ max units output voltage +v out 11.88 12.0 12.12 14.85 15.0 15.15 vdc ?v out 11.88 12.0 12.12 14.85 15.0 15.15 output current 2.5 2.0 a output power 1 ?5? to +85? 30.0 30.0 w output ripple voltage bw 2 mhz 50 85 50 85 mv p-p line regulation v in = 18 to 40 10 25 10 25 mv load regulation no load to full 20 50 20 50 mv cross regulation 2 +v out 2.5 3.5 2.2 3.2 % ?v out 2.5 3.5 2.2 3.2 input voltage continuous 18 28 40 18 28 40 vdc ?5? to +85? transient 50 ms 50 50 input current no load 35 50 45 60 full load 1350 1400 ma inhibited 24 24 input ripple current bw 2 mhz 15 50 15 50 ma p-p efficiency 81 84 82 85 % start-up delay 3 ?0 30 ms overshoot 500 500 mv electrical characteristics: 25? tc, 28 vdc vin, 100% load, unless otherwise specified. notes 1. up to 90% of full power is available from either output providing the total power does not exceed 30 watts. 2. the effect on the output voltage of either output (held at 3 watts) when the other output is varied from 3 to 27 watts. 3. a low output impedance power source is required on the input to realize this start-up time. if less than full surge current is available, start-up time will be longer pin mtw2805s single output dual output 1 positive input positive input positive input 2 inhibit inhibit no connection 3 sense return no connection positive output 4 output common output common output common 5 positive output positive output negative output 6 positive sense no connection no connection 7 case ground case ground case ground 8 no connection no connection inhibit 9 no connection no connection input common 10 input common input common input common bottom view mtw squared corner and dot on top of cover indicate pin one. 10 9 8 7 6 12345 see section b8, case j5, for dimensions. f igure 1: p in o ut
mtw 28 12 d / es base model voltage in output voltage screening number of outputs (s = single, d = dual) (standard screening has no designator in this position.) b4-12 mtw series 30 watt dc/dc c onverters typical performance curves: 25? tc f igure 5 f igure 7 output power (watts) mtw2815d efficiency efficiency (%) 72 84 82 80 76 74 15 510 78 86 18 v 40 v 20 25 30 68 70 88 28 v output power (watts) mtw2812d and mtw2815d low line dropout inupt voltage (volts) 15 17 15 510 16 20 25 30 14 18 mtw2812d mtw2815d output power (watts) mtw2805s efficiency efficiency (%) 72 84 82 80 76 74 15 510 78 86 28 v 19 v 40 v 20 25 30 68 70 88 f igure 2 output power (watts) mtw2812s efficiency efficiency (%) 72 84 82 80 76 74 15 510 78 86 28 v 18 v 40 v 20 25 30 68 70 88 f igure 3 output power (watts) mtw2812s and mtw2815s low line dropout input voltage (volts) 15 17 15 510 16 20 25 30 14 18 mtw2815s mtw2812s f igure 6 f igure 4 output power (watts) mtw2812d efficienc y efficiency (%) 72 84 82 80 76 74 15 510 78 86 20 25 30 68 70 88 28 v 18 v 40 v model numbering key 24421-001-dts rev a dq# 1017 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. mtw series is a trademark of interpoint. copyright 1994 - 1999 interpoint. all rights reserved.
b8-22 case j c ases materials header case j1 cold rolled steel/nickel/gold cases j2 - j5 cold rolled steel/nickel/tin cover case j1 kovar/nickel case j2 - j5 cold rolled steel/nickel/tin pins #52 alloy (all cases) case j1 mhv series triple ?compression glass seal mtr series triple ?ceramic seal cases j2 - j5 compression glass seal case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.2) for two decimal places unless otherwise specified case j bottom view see figures 36 - 40 for pin configuration 1.350 max (34.29) caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300 c for 10 seconds per pin. flange thickness: cases j1 and j5 0.060 (1.52) case j2 0.073 (1.85) max cases j3 and j4 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) 2.720 max (69.09) dot on top of case indicates pin one f igure 35: c ase j m aximum d imensions note: although every effort has been made to render the case drawings at actual size, variations in the printing process may ca use some distortion. please refer to the numerical dimensions for accuracy.
b8-25 case j c ases 0.040 dia. (1.02) 0.000 0.25 (6.4) 543 0.000 0.170 (4.32) 0.210 (5.33) 1.370 (34.80) 1.770 (44.96) 1.980 (50.29) 12 0.173 (4.39) 0.000 1.173 (29.79 0.673 (17.09) 0.162 dia (4.11) flanged cases: designator required in case option position of model number. fmd28-461 emi filter (down-leaded): screening ?standard or es bottom view case j4 solder seal solder tip-off 0.505 max (12.83) squared corner and dot on top of case indicate pin one. f igure 39: c ase j4 0.040 dia. (1.02) 0.000 0.25 (6.4) 10 9 8 7 6 0.000 0.170 (4.32) 0.210 (5.33) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 1.770 (44.96) 1.980 (50.29) 12345 0.173 (4.39) 0.000 1.173 (29.79 0.673 (17.09) 0.162 dia (4.11) flanged cases: designator required in case option position of model number for mhl series and mto series only. mhl series, mto series, mtw series: screening ?standard or es hr300 series: no screening options bottom view case j5 solder seal solder tip-off 0.505 max (12.83) squared corner and dot on top of case indicate pin one. f igure 40: c ase j5
c2-12 qa screening 85? products test (85? products excluding hr products) standard /es pre-cap inspection method 2017 yes yes temperature cycle (10 times) method 1010, cond. b, -55? to 125? no yes constant acceleration method 2001, 500 g no yes burn-in 96 hours at 70? ambient (typical) no yes final electrical test mil-prf-38534, group a subgroups 1 and 4: +25? case yes yes hermeticity testing fine leak, method 1014, cond. a no yes gross leak, method 1014, cond. c no yes gross leak, dip (1 x 10 -3 ) yes no final visual inspection method 2009 yes yes test methods are referenced to mil-std-883 as determined by mil-prf-38534. mfw series mtw series mhe/mlp series mhl series mrh series mto series msr series dch series fm/fma/fmb emi filters msf emi filter 85? p roducts applies to the following products:
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