models vdc o utput b4-23 f eatures ?5? to +85 c operation 9 to 16 or 16 to 36 vdc input fully isolated opto-coupler feedback fixed frequency, 250 khz typical topology ?push-pull forward 50 v for 50 ms transient protection inhibit function indefinite short circuit protection up to 79% efficiency triple +5 & 12 +5 & 15 description interpoint s mto series of dc/dc converters delivers 15 watts of output power with three output voltages and a choice of two input voltage ranges. the mto series converters are packaged in hermetically sealed metal cases and operate at full load over a case temperature range of -55? to +85? (measured at the base plate of the converter). c onverter d esign the push-pull forward topology coupled with pulse-width modulation minimizes output noise and maintains good regulation. nominal switching frequency is 250 khz. although an internal input filter reduces input ripple current, for applications requiring conformance to mil-std-461c, ce03, use the mto in conjunction with interpoint s fm-461 emi filter. operating at maximum ratings may require removing self-generated heat. to increase heat dissipation, heat conducting material can be used in contact with the converter s base plate. interpoint s thermal mounting pad (tmp), model tmp-002, is designed for use with the mto converter. f eatures an inhibit terminal, pin 8, provides shut-down and start-up control. applying a logic low (<0.8 v) will disable the output of the converter reducing input current to 8 ma, typical. leaving the terminal uncon- nected or connecting it to vin will enable the converter. the inhibit pin has an open circuit voltage of approximately 10 volts. soft-start provides a controlled 20 milliseconds turn-on to minimize inrush current and reduce overshoot at initial start-up or when inhibit is released. internal current limiting circuitry protects all three outputs against short circuits. when output power exceeds approximately 125% of maximum output power, the output currents are limited. in addition, separate current limiting circuitry protects each output individually. p ackaging mto converters are packaged in hermetically sealed metal cases. the cases are constructed of cold-rolled steel with a fused tin finish. mto converters can be purchased in a flanged or non-flanged case. the flanged option provides increased heat dissipation and also provides greater stability when mechanically secured. dc/dc c onverters 12 & 28 v olt i nput mto series 15 watt size (max.): non-flanged, case f4, 1.950 x 1.350 x 0.505 inches (49.53 x 34.29 x 12.83 mm) flanged, case j5, 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm) see section b8, cases f4 and j5, for dimensions. weight: 53 grams typical screening: standard or es. see section c2 for screening options, see section a5 for ordering information.
typical characteristics inhibit recommended operating conditions absolute maximum ratings inhibit ttl open collector logic low (output disabled) v = <0.8 v inhibit pin current < 2.0 ma referenced to input common logic high (output enabled) unconnected or connected to vin output power 15 watts lead soldering temperature (10 sec per lead) 300? storage temperature range (case) ?5? to +125? b4-24 mto series 15 watt dc/dc c onverters output voltage temperature coefficient 150 ppm/? typical input to output capacitance 80 pf typical current limit 125% of full load typical isolation 100 megohm minimum at 500 v conversion frequency 250 khz typical inhibit pin voltage (unit enabled) 10 v typical input voltage range mto12xxt 9 to 16 vdc continuous mto28xxt 16 to 36 vdc continuous mto12xxt 25 v for 50 msec transient mto28xxt 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 note 1. minimum load required for full output capability on auxiliary outputs. minimum current can be reduced when dual outputs are used at reduced loads. mto1212t mto1215t mto2812t mto2815t parameter condition min typ max min typ max min typ max min typ max units main 4.95 5.0 5.05 4.95 5.0 5.05 4.95 5.0 5.05 4.95 5.0 5.05 output voltage + auxiliary 11.88 12.0 12.12 14.85 15.0 15.15 11.88 12.0 12.12 14.85 15.0 15.15 vdc ?auxiliary 11.88 12.0 12.12 14.85 15.0 15.15 11.88 12.0 12.12 14.85 15.0 15.15 output current main 1 100 2000 100 2000 100 2000 100 2000 ma auxiliary 208 167 208 167 main 10.0 10.0 10.0 10.0 output power + auxiliary 2.5 2.5 2.5 2.5 w ?auxiliary 2.5 2.5 2.5 2.5 total ?5 15 15 15 output ripple main 80 80 80 80 voltage, bw = 1 mhz auxiliary 30 30 30 30 mv p-p line regulation main 5 10 5 10 5 10 5 10 mv v in = min. to max. auxiliary 30 48 30 60 30 48 30 60 load regulation main 10 20 10 20 10 20 10 20 mv no load to full auxiliary 30 48 30 60 30 48 30 60 input voltage continuous 9 12 16 9 12 16 16 28 36 16 28 36 vdc transient 50 ms 25 25 50 50 v no load 60 60 30 30 input current full load 1670 1670 700 700 ma inhibited 8 10 8 10 8 10 8 10 input ripple current 50 100 50 100 20 50 20 50 ma p-p efficiency 76 79 76 79 76 79 76 79 % electrical characteristics: 25? tc, 28 vdc vin (12 vdc for 12v models), 100% load, unless otherwise specified.
positive input 10k 3.9k 2n3904 optional pullup (1) (2) (10) 13v 3k 9k bias input common inhibit 7 short circuit amp linear regulator linear regulator pass transistor pass transistor pulse width modulator pre- regulator case ground error amp 8 inhibit 1 positive input 10 input common 2 3 5 4 +5 v out output common positive auxiliary output negative auxiliary output f igure 2: i nhibit i nterface e xample b4-25 mto series 15 watt dc/dc c onverters f igure 1: s implified s chematic
b4-26 mto series 15 watt dc/dc c onverters f igure 4 mto2815t efficiency representative of all models efficiency (%) 66 70 72 78 82 61012 68 74 76 80 24 8 1416 18 v in 28 v in 36 v in output power (watts) typical performance curve: 25? tc pin out pin designation 1 positive input 2 +5 vdc output 3 output common 4 negative aux. output 5 positive aux. output 6 no connection 7 case ground 8 inhibit 9 no connection 10 input common bottom view mto 10 9 8 7 6 12345 squared corner and dot on top of cover indicate pin one. dotted line outlines flanged package option. see section b8, cases f4 and j5, for dimensions f igure 3: p in o ut mto 12 12 t f / es base model input voltage output voltage number of outputs (t = triple) (aux. vout) screening case option (non-flanged case has no designator in this position) (standard screening has no designator in this position.) model numbering key 24223-001-dts rev a dq# 1021 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. mto series is a trademark of interpoint. copyright 1990 - 1999 interpoint. all rights reserved.
b8-12 case f c ases materials header case f1 cold rolled steel/nickel/gold cases f2 - f4 cold rolled steel/nickel/tin cover case f1 kovar/nickel cases f2 - f4 cold rolled steel/nickel/tin pins #52 alloy (all cases) mhv series triple ?compression glass seal mtr series triple, case f1 ?ceramic seal mtr series triple, case f2 ?compression glass seal hum40 ?compression glass seal or ceramic seal case f3 ?compression glass seal case f4 ?compression glass seal or ceramic 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 f bottom view see figures 20 - 23 for pin configuration 1.350 max (34.29) 1.950 max (49.53) 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. dot on top of case indicates pin one 109876 0.000 0.170 (4.32) 1.170 (29.72) 0.000 0.170 (4.32) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 1.770 (44.96) 12345 0.040 dia. (1.02) 0.000 0.25 (6.4) mtr series mhv series 0.405 max (10.29) 0.000 0.405 max (10.29) bathtub platform mtr series triple and mhv series triple: screening ?standard, es, or 883 bottom view case f1 seam seal 0.25 (6.4) dot on top of case indicates pin one f igure 20: c ase f1 f igure 19: c ase f 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.
b8-14 case f c ases 0.000 0.170 (4.32) 1.170 (29.72) 0.000 0.170 (4.32) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 1.770 (44.96) 0.040 dia. (1.02) 0.000 mto and mhl series: screening ?standard or es hr153 series: no screening options bottom view case f4 0.250/0.300 (6.35/7.62) solder seal 0.505 max (12.83) solder tip-off 109876 12345 squared corner and dot on top of case indicate pin one. f igure 23: c ase f4
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) 54 3 0.000 0.170 (4.32) 0.210 (5.33) 1.370 (34.80) 1.770 (44.96) 2.150 (54.61) 1 2 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 (rev b) 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) 2.150 (54.61) 1234 5 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 (rev b) 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 (mounting hole dimension corrected to 2.150 (rev 20060626)
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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