b4-19 f eatures ??5? to +85? operation 19 to 36 vdc input or 16 to 36 vdc input typical fully isolated magnetic feedback fixed frequency, 375 khz typical ?topology ?single ended forward 50 v for 50 ms transient protection inhibit function output trim indefinite short circuit protection radiation hardened to 10 13 neutrons/sq cm neutron fluence 10 11 rads(si)/sec dose rate 10 5 rads(si) total dose meets mil-std-704e emergency operation and transient standards description the mrh series of dc/dc converters offers up to 15 watts of power in a radiation hardened design. the low profile mrh converters are manufactured in interpoint s fully certified and quali- fied mil-std-1772 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. the mrh converters are switching regulators which use a quasi- square wave, single ended forward converter design with a nominal switching frequency of 375 khz, typical. close regulation (main output line regulation is 0.05%) is maintained with advanced constant frequency pulse width modulation design techniques. with a 16 to 36 vdc input range and triple outputs of +5 vdc and either 12 or 15 vdc, mrh converters are suitable for a wide range of airborne, naval, and ground based applications. the mrh s feed-forward compensation topology provides high levels (50 db nominal) of input-to-output ripple rejection. the mrh converters provide full power operation from ?5? to +85? with derated operation to +125?. flanged and non-flanged package configurations are available with optional environmental screening. i nhibit f unction the mrh series incorporates an inhibit terminal that can be used to disable internal switching. the converter is inhibited when a logic low ( 0.8 v) signal is applied to the ttl open collector compatible inhibit pin. in the inhibit mode the inhibit pin current requirement is less than ? ma. the converter resumes normal operation when a logic high ( 3 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. o utput v oltage t rim the output voltage on single output models can be trimmed upward by as much as 5% of nominal by connecting a resistor between pin 3 and 4. r adiation h ardened the mrh dc/dc converters are designed to provide continuous normal operation through radiation levels associated with proximity to thermonuclear events. the converters will operate normally in environments with up to 10 13 neutrons per square centimeter neutron fluence, 10 11 rads (si) per second dose rate, and 10 5 rads (si) total dose. these levels of radiation tolerance make the mrh converters suitable for electronics in tactical programs where oper- ation in high radiation environments is required. at the highest dose rating (10 11 rads (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. dc/dc c onverters 28 v olt i nput mrh series 15 watt models vdc o utput single 5 12 15 dual ? 2 ? 5 triple +5 & 12 +5 & 15 size (max.): non-flanged, case f3 1.950 x 1.350 x 0.455 inches (49.53 x 34.29 x 11.56 mm) flanged, case j3 2.720 x 1.350 x 0.455 inches (69.09 x 34.29 x 11.56 mm) see section b8, cases f3 and j3, for dimensions. weight: 50 grams typical screening: standard or es. see section c2 for screening options and section a5 for ordering information.
recommended operating conditions absolute maximum ratings inhibit power dissipation (pd) ? w output power 15 watts lead soldering temperature (10 sec per lead) 300? storage temperature range (case) ?5? to +125? b4-20 mrh series 15 watt dc/dc c onverters typical characteristics input voltage range continuous 16 to 40 vdc mrh28xxs and mrh2812d 19 to 40 vdc mrh2815d 16 to 36 vdc mrh285xxt 50 v for 50 msec transient case operating temperature (tc) ?5? to +85? full power ?5? to +125? absolute inhibit ttl open collector logic low (output disabled) inhibit pin current ? ma referenced to input common logic high (output enabled) open collector electrical characteristics: 25? tc, 28 vdc vin, 100% load, unless otherwise specified. single output models mrh2805s mrh2812s mrh2815s parameter conditions min typ max min typ max min typ max units output voltage 4.95 5.0 5.05 11.88 12 12.12 14.85 15 15.15 vdc output current ?5? to +85? 0.05 3.0 0.02 1.25 0.016 1.0 a output power min. to max. v in 0.25 15 0.25 15 0.25 15 w output ripple 10 khz to 2 mhz 40 70 25 50 25 50 mv p-p line regulation 16 to 40 v in 5 10 5 20 5 20 mv load regulation 1 min. load to full 5 30 5 30 5 30 mv input voltage 2 no load to full 16 28 40 16 28 40 19 28 40 vdc transient 50 ms 50 50 50 v input current no load 50 60 50 60 50 60 full load 750 730 720 ma inhibited 22 25 22 25 22 25 input ripple current 10 khz to10 mhz 25 50 25 50 25 50 ma p-p efficiency 73 75 76 78 78 80 % load fault 3 short circuit 5 5 5 w power dissipation overload 5 5 5 start-up delay 3 10 3 10 3 10 ms notes 1. load regulation is not guaranteed below minimum load. 2. converter should not be inhibited or operated below 12 vin above 10 4 rads (si) total dose. 3. indefinite short circuit protection is not guaranteed above 85? case. output voltage temperature coefficient 250 ppm/? max input to output capacitance 100 p, typical current limit 125% of full load typical isolation 100 megohm minimum at 500 v conversion frequency 375 khz. typical inhibit pin voltage (unit enabled) 5 to 6 v radiation (will operate through) neutron fluence 10 13 neutrons/ sq. cm. radiation dose rate 10 11 rads (si) /sec total dose 10 5 rads (si) derating output power/current and input voltage temperatures are referenced to the temperature at the converter s baseplate linearly derate output power/current from 100% at 85? to 0% at 125?. above 105? linearly derate steady state input voltage to 33 v and transient voltage to 38 v, at 125?. operation below an input voltage of 19 volts, including operation in mil- std-704e emergency power conditions, is possible with derated output power. see figures 9 and 10.
dual and triple output models mrh2812d mrh2815d mrh2812t mrh2815t parameter condition min typ max min typ max min typ max min typ max units output voltage main +11.88 +12.0 +12.12 +14.85 +15.0 +15.15 +4.95 +5.0 +5.05 +4.95 +5.0 +5.05 aux. ?1.82 ?2.0 ?2.18 ?4.77 ?5.0 ?5.23 11.50 12.0 12.50 14.40 15.0 15.60 vdc output current 1 main +0.01 +0.625 +1.0 +0.008 +0.50 +0.8 +0.40 +1.80 +2.00 +0.40 +1.80 +2.00 a ?5? to +85? aux. ?.01 ?.625 ?.0 ?.008 ?.50 ?.8 0.00 0.25 0.50 0.00 0.20 0.40 output power 1 main 7.5 12 7.5 12 2 9 10 2 9 10 aux. 7.5 12 7.5 12 0 3 6 0 3 6 w total 0.25 15 0.25 15 2 15 2 15 output ripple main 40 60 40 60 50 75 30 50 voltage, 10 khz - 2 mhz aux. 40 60 40 60 30 50 30 50 mv p-p line regulation main 5 20 5 20 5 10 5 10 mv v in = min. to max. aux. 20 100 20 100 200 400 250 500 load regulation 2 main 5 30 5 30 5 10 5 10 mv no load to full aux. 10 100 10 100 200 400 250 500 input voltage 3 continuous 16 28 40 19 28 40 16 28 36 16 28 36 vdc transient 50 ms 50 50 40 40 v input current no load 55 70 55 70 70 80 85 95 full load 700 700 770 778 ma inhibited 22 25 22 25 23 25 23 25 input ripple current 10 khz to 2 mhz 25 50 25 50 25 50 25 50 ma p-p efficiency 76 78 76 78 70 72 70 72 % load fault 4 short circuit 5 5 5 5 w power dissipation overload 5 5 5 5 start-up delay 3 10 3 10 3 10 3 10 ms b4-21 mrh series 15 watt dc/dc c onverters notes 1. maximum combined output power is 15 watts for both dual and triple models. dual output models: the maximum specification is the total output current/power. up to 80% of that total is available from either output provided the positive output maintains a minimum of 20% of the total p ower used. triple output models: the maximum combined power of the auxiliaries is 6 watts, of which 100% is available from either output. 2. load regulation is not guaranteed below minimum load. 3. converter should not be inhibited or operated below 12 vin above 10 4 rads (si) total dose. 4. indefinite short circuit protection is not guaranteed above 85? case. electrical characteristics: 25? tc, 28 vdc vin, 100% load, unless otherwise specified. pin out pin single output dual output triple output 1 positive input positive input positive input 2 no connection no connection main (+5) output 3 trim negative output output common 4 output common output common neg. aux. output 5 positive output positive output pos. aux. output 6 no connection no connection no connection 7 case ground case ground case ground 8 inhibit inhibit inhibit 9 no connection no connection no connection 10 input common input common input common dot on top of cover indicates pin one. bottom view mrh flanged and non-flanged see section b8, cases f3 and j3, for dimensions. 10 9 8 7 6 12345 dotted line outlines flanged package option. f igure 1: p in o ut
mrh 28 12 t f / es base model input voltage output voltage screening number of outputs case option (non-flanged case has no designator in this position) (s = single, d = dual, t = triple) (aux. vout for triple models) (standard screening has no designator in this position.) b4-22 dc/dc c onverters typical performance curves: 25? tc , 28 vdc vin, 100% load, unless otherwise specified. f igure 5 f igure 7 85 0.1 1 10 100 80 75 70 65 60 55 45 40 35 50 audio rejection, mrh series attenuation (db) frequency (khz) ? 09 ? ? ? ? ? ? ? ? 0 12345678 main output power (watts) mrh2815t aux. reg. vs. main load aux. output voltage (% of nominal) output power (watts) mrh2805s efficiency efficiency (%) 40 90 80 70 60 50 415 16v 28v 40v 6 8 10 12 14 f igure 2 40 90 80 70 60 50 415 6 8 10 12 14 28v 36v 16v output power (watts) mrh2815d efficiency efficiency (%) f igure 3 ?0 10 6 2 ? ? 8 4 0 ? ? mrh2815d neg. output cross reg. ?out (% of nominal) 0 3 6 9 12 15 pos. output power (watts) 15 12 9 6 3 0 neg. output power (watts) f igure 6 f igure 4 56 515 58 60 62 64 66 68 70 72 74 36 28 16 6 8 10 12 14 output power (watts) mrh2815t efficiency efficiency (%) 5 4 3 2 1 0 -1 -2 -3 -4 -5 +aux ?ux mrh2815t aux. output with unbalanced loads aux. ouptut voltage (% of nominal) 01234 56 pos. aux. output power (watts) 65432 10 neg. aux. output power (watts) f igure 8 12.0 15 2 12.5 13.0 13.5 14.0 14.5 15.0 4 6 8 10 12 14 15.5 output power (watts) 50 mv drop mrh2805s low line dropout input voltage (volts) f igure 9 f igure 10 14 13 12 11 135 79111315 15 output power (watts) mrh2815t low line dropout input voltage (volts) mrh series 15 watt model numbering key 23821-001-dts rev a dq# 1020 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. mrh series is a trademark of interpoint. copyright 1994 - 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.
b8-13 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 hum-40: screening ?standard or es bottom view case f2 0.250/0.300 (6.35/7.62) solder seal 0.415 0.015 (10.54 0.38) solder tip-off 109876 12345 squared corner and dot on top of case indicate pin one. f igure 21: c ase f2 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 mrh series: screening ?standard or es bottom view case f3 0.250/0.300 (6.35/7.62) solder seal 0.455 max (11.56 ) solder tip-off 109876 12345 squared corner and dot on top of case indicate pin one. f igure 22: c ase f3
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.
b8-24 case j c ases 0.040 dia. (1.02) 0.000 0.25 (6.4) 0.173 (4.39) 0.000 1.173 (29.79 0.673 (17.09) flanged case: designator required in case option position of model number. hum-40 module: screening ?standard or es bottom view case j2 109876 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 hum-40 module solder seal solder tip-off 0.415 max (10.54) squared corner and dot on top of case indicate pin one. f igure 37: c ase j2 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 case: designator required in case option position of model number. mrh series: screening ?standard or es bottom view case j3 solder seal solder tip-off 0.455 max (11.56) squared corner and dot on top of case indicate pin one. f igure 38: c ase j3
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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