models vdc o utput b2-77 size (max.): 1.460 x 1.130 x 0.330 inches (37.08 x 28.70 x 8.38 mm) see section b8, case e1 for dimensions. weight: 21 grams typical. screening: standard or es. see section c2 for screening options. single 5 12 15 dual ? 2 ? 5 description the mhf series of dc/dc converters offer up to 12 watts of power from single or dual outputs in a single package over a the full military temperature range. thick film hybrid manufacturing tech- nology produces high levels of miniaturization, giving the mhf series converters a low profile (0.330 inch), small board area (1.65 square inches), and high power density (22 watt/in 3 ). the parts are packaged in hermetically sealed steel enclosures, making them ideal for use in military, aerospace, and high reliability industrial applications. d esign m ethodology the mhf converters are switching regulators which use a quasi- square wave, single ended forward converter design with a nominal switching frequency of 600 khz. isolation between input and output circuits is provided with a transformer in the forward power loop and a temperature insensitive optical link in the feedback control loop. output regulation is accomplished with constant frequency pulse width modulation. both line and load regulation are typically within 10 mv. on dual output models, the positive output is independently regu- lated and the negative output is cross-regulated. figures 7 and 8 illustrate what effects load changes have on the negative output. indefinite short circuit protection and overload protection are provided by sensing output load current and restricting the output current to approximately 125% of full load output current. since the output current is sensed in the secondary stage, the result is a predictable, constant output current control with no foldback char- acteristics. mhf converters are provided with internal filtering elements on both the input and output to help reduce the need for external components. for information about filtering to meet mil- std-461 s ce03 test, contact your interpoint representative. w ide v oltage r ange the mhf series is designed to provide full power operation over the input voltage range of 16 to 40 volts. the 15 volt models provide a 19 to 40 volt range. operation below 16 volts (or 19 volts for the 15 volt models), including operation in mil-std-704e emergency power conditions, is possible with derated output power. please refer to the low line drop-out graphs, figures 9 and 10. m ilitary t emperature r ange the mhf series provides full power operation at case temperatures from ?5? up to +125?. all 12 and 15 volt models in both single and dual output configurations provide full power operation at +125? with derated power to 135?. the +5 volt model provides full power at 110? derated to 0% at 130?. depending on operating levels, air flow, and ambient temperature; heat sinking may be required. i nhibit f eature an inhibit terminal is provided that can be used to disable internal switching, resulting in a very low quiescent input current. an open collector ttl compatible low ( 0.8v) is required to control the inhibit function. this level may be supplied by an open collector gate since the inhibit pin is provided with an internal pull-up resistor. dc/dc c onverters 28 v olt i nput mhf series 12 watt f eatures ?5 to +125? operation 16 to 40 vdc input (19 to 40 vdc for 15 volt outputs) fully isolated optocoupler feedback fixed frequency 600 khz typical forward converter topology 50 v for up to 50 ms transient protection inhibit function indefinite short circuit protection up to 83% efficiency, 22 w/in 3
absolute maximum ratings typical characteristics inhibit recommended operating conditions input voltage 16 to 40 vdc (19 to 40 vdc 15 volt output) output power 12 watts (10 watts MHF2805S) lead soldering temperature (10 sec per lead) 300? storage temperature range (case) ?5? to +135? b2-78 mhf series 12 watt dc/dc c onverters output voltage temperature coefficient 150 ppm/?, typical input to output capacitance 50 pf, typical current limit 125% of full load, typical isolation 100 megohm minimum at 500 v conversion frequency 600 khz typical inhibit pin voltage (unit enabled) 8 to 11 v input voltage range 16 to 40 vdc continuous 19 to 40 vdc 15 volt outputs continuous 50 v for 50 msec transient case operating temperature (tc) ?5? to +125? full power ?5? to +110? full power for MHF2805S ?5? to +135? absolute ?5? to +130? absolute for MHF2805S derating output power/current linearly from 100% at 125? to 0% at 135? linearly from 100% at 110? to 0% at 130? for MHF2805S inhibit ttl open collector logic low (output disabled) logic low 0.8 v max inhibit pin current 4 ma max 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 MHF2805S mhf2812s mhf2815s 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 2.0 1.0 0.8 a output power min. to max. v in 10 12 12 w output ripple 10 khz to 2 mhz 40 60 30 60 25 50 mv p-p line regulation min. to max. v in 10 50 10 50 10 50 mv load regulation no load to full 10 50 10 50 10 50 mv input voltage continuous 16 28 40 16 28 40 19 28 40 vdc transient 50 ms 50 50 50 v input current no load 20 30 20 30 20 30 full load 483 557 535 ma inhibited 2 3 2 3 2 3 input ripple current 10 khz to 2 mhz 135 180 150 200 150 220 ma p-p efficiency 74 77 77 81 80 83 % load fault 1 power dissipation overload 5 5 5 w short circuit 3.5 2.8 2 start-up delay 180 300 80 200 150 250 ms notes 1. indefinite short circuit protection not guaranteed above 125? case temperature (110? case for MHF2805S).
pin out pin single output dual output 1 inhibit inhibit 2 no connection positive output 3 output common output common 4 positive output negative output 5 no connection no connection 6 case ground case ground 7 input common input common 8 positive input positive input bottom view mhf squared corner and dot on top of cover indicate pin one. 1 2345 876 b2-79 mhf series 12 watt dc/dc c onverters dual output models mhf2812d mhf2815d 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 11.82 12.0 12.18 14.77 15.0 15.23 output current 1, 2 0.5 1.0 0.4 0.8 a output power 2 +v out 10.8 10.8 ?v out 10.8 10.8 w total 12 12 output ripple voltage 10 khz to 2 mhz 30 60 30 60 mv p-p line regulation min. to max. v in +v out 5 50 5 50 mv load regulation no load to full +v out 5 50 10 50 mv cross regulation 20% to 80% load 3 5 10 4 8 % 50% load 4 ?5 35 input voltage continuous 16 28 40 19 28 40 vdc no load to full transient 50 ms 50 50 v input current no load 25 35 25 35 full load 550 536 ma inhibited 1.9 3 1.9 3 input ripple current 10 khz to 2 mhz 175 240 175 240 ma p-p efficiency 78 81 80 83 % load fault 5 power dissipation short circuit 2.8 2 w overload 5 5 start-up delay 150 250 150 250 ms notes 1. applies to both outputs. 2. maximum combined output power is 12 watts. a maximum of 90% is avail- able from either output. 3. 20% to 80% load on the positive output and 80% to 20% on the negative output. see figure 8. 4. 50% load on the positive output and 50% to 20% load on the negative output. 50% load on the negative output and 50% to 20% load on the positive output. see figure 7. 5. indefinite short circuit protection not guaranteed above 125? case temper- ature. model number key mhf 28 12 d / es base model input voltage output voltage number of outputs (s = single, d = dual) screening (standard screening has no designator in this position.) electrical characteristics: 25? tc, 28 vdc vin, 100% load, unless otherwise specified. f igure 1: p in o ut see section b8, case e1, for dimensions.
b2-80 mhf series 12 watt dc/dc c onverters typical performance curves: 25? tc , 28 vdc vin, 100% load, unless otherwise specified. f igure 5 f igure 7 output power (watts) mhf2812d efficiency efficiency (%) 50 90 80 70 60 2 4 6 8 10 12 16v 40v 28v 14 output load (%) condition a: 50% load pos. vout, 50% to 20% neg. vout condition b: 50% load neg. vout, 50% to 20% pos. vout mhf negative output voltage cross regulation negative output voltage change (%) ?0 01023040 50 ? ? ? 0 2 4 6 10 2812d cond. b cond. a 2812d 8 2 2815d output power (watts) MHF2805S efficiency efficiency (%) 50 90 80 70 60 24681012 28v 14 40v 16v f igure 2 output power (watts) mhf2812s efficiency efficiency (%) 50 90 80 70 60 2 4 68 10 12 16v 40v 28v 14 f igure 3 output power (watts) mhf2815d efficiency efficiency (%) 50 90 80 70 60 2 4 6 8 10 12 19v 40v 28v 14 f igure 6 f igure 4 output power (watts) mhf2815s efficiency efficiency (%) 50 90 80 70 60 2 4 6 8 10 12 19v 40v 28v 14 output load (%) positive output 20% to 80% load negative output 80% to 20% load mhf dual negative output voltage cross regulation negative output voltage change (%) ?0 0 20406080 100 ?0 ? ?5 0 5 10 15 20 2812d 2815d f igure 8 output power (watts) 50 mv drop mhf single low line dropout input voltage (volts) 11 24681012 14 13 14 12 15 16 17 18 19 2812s 2815s 2805s f igure 9f igure 10 output power (watts) 50 mv drop mhf dual low line dropout input voltage (volts) 11 24681012 14 13 14 12 15 16 17 18 19 2812d 2815d 218211-001-dts rev a dq# 1011 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. mhf series is a trademark of interpoint. copyright 1992 - 1999 interpoint. all rights reserved.
b8-10 case e c ases case e bottom view see figures 16 ?18 for pin configurations. squared corner and dot on top of case indicate pin one. 1.460 max (37.08) 1.130 max (28.70) materials header cold rolled steel/nickel/gold cover kovar/nickel (smhf series cold rolled steel/nickel/gold) pins #52 alloy/gold compression glass seal 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 300 c for 10 seconds per pin. 0.000 0.205 (5.21) 0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07) 0.330 max (8.38) 0.000 0.25 (6.35) 0.000 0.160 (4.06) 0.960 (24.38) 1 2345 0.030 dia. (0.76) 876 mhf+ series single and dual: screening ?standard, es, or 883 mhf series and lim5050 module: screening ?standard or es smhf series single and dual and slim5050 module: screening ?space standard, h, or k hr120 series: no screening options bottom view case e1 0.330 max (8.38) 0.000 0.25 (6.35) projection weld seam seal squared corner and dot on top of case indicate pin one. f igure 16: c ase e1 f igure 15: c ase e 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.
c2-10 test (125? products) standard /es /883 (class h)* pre-cap inspection method 2017, 2032 yes yes yes temperature cycle (10 times) method 1010, cond. c, -65? to 150? no no yes method 1010, cond. b, -55? to 125? 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? no no yes 96 hours at 125? case (typical) no yes no final electrical test mil-prf-38534, group a subgroups 1 through 6: -55?, +25?, +125? no no yes subgroups 1 and 4: +25? 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 test 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 ?5? to +125?. mor series mflhp series mfl series mhp series mtr series mqo series** mhd series mhv series mhf+ series mhf series** mga series msa series mgh series mch series fm-704a emi filter fmd**/fme emi filter fmc emi filter fmh emi filter fmga emi filter fmsa emi filter hum modules** lcm modules** lim modules qa screening 125? products 125? p roducts applies to the following products **mflhp series, mqo series, mhf series, fmd emi filters, hum modules, and lcm modules do not offer ?83?screening.
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