(888) 597-wall www.wallindustries.com 1 of 9 technical datasheet rev. d FEMLV-1275 mil-std-1275d front end filter module for lv series dc/dc converters applications: ? mil-std-1275d 28v vehicle electrical system compliance ? voltage surge and spike filtering features: ? surge and spike protection for up to 150 watts ? ps shutdown pin to remotely disable downstream device for protection ? allows lv series to operate through mil- std-1275 disturbances description: the wall industries front end filt er module (FEMLV-1275) was designed with the lv series dc-dc converter in mind. this module will allow an lv series dc-dc con verter to be used safely in 28v vehicle electrical system requirements set forth by mil-std-1275d. other requirements such as mil-std-461e may apply but are not discussed in this data sheet and additional circuitry may be required.
technical datasheet rev d FEMLV-1275 (888) 597-wall www.wallindustries.com page 2 of 9 mil-std-1275d test results detailed requirements test conditions detailed results figure or picture 5.1.2.1 starting disturbances 5.1.2.2 initial engagement surges vehicle system voltage pulsed to 6v for less than 1 second. no damage to converter. converter operates normally before, and after. photo 1. 5.1.2.3 cranking level vehicle system voltage at 16v for 30 seconds. returned to 28v for 1 minute 30 seconds, and repeated 2 more times. no damage to converter. converter operates normally before, and after. photo 2. 5.1.3 normal operation mode 5.1.3.1 steady-state voltage vehicle system voltage = 25 ? 30v. no damage to converter. converter operates normally before, during, and after. photo 3. 5.1.3.2 ripple vehicle system voltage = 25 ? 30v with 2v ripple, frequency @ 50hz, 12khz, 48khz and 200khz no damage to converter. converter operates normally before, during, and after. figure 1. 5.1.3.3 surges vehicle system voltage = 25 ? 30v. pulse of +40v, 50ms duration imported. no damage to converter. converter operates normally before, during, and after. photo 4 and figure 2. 5.1.3.4 spikes vehicle system voltage = 25 - 30v. pulse of 250v, 70s duration no damage to converter. converter operates normally before, during, and after. photo 6 and figure 3.
technical datasheet rev d FEMLV-1275 (888) 597-wall www.wallindustries.com page 3 of 9 5.1.4 generator-only mode 5.1.4.1 steady-state voltage vehicle system voltage = 23 ? 33v. no damage to converter. converter operates normally before, during, and after. photo 3. 5.1.4.2 ripple vehicle system voltage = 23 ? 33v with 7v ripple, frequency @ 50hz, 12khz, 48khz and 200khz no damage to converter. converter operates normally before, during, and after. figure 1. 5.1.4.3 surges vehicle system voltage = 23 ? 33v. pulse of +100v, 50ms duration imported. no damage to converter. converter should operate normally before, during and after. output of filter module will be briefly interrupted and ps control will be pulled low. photo 5 and figure 2. 5.1.4.4 spikes vehicle system voltage = 23 ? 33v no damage to converter. converter operates normally before, during, and after. photo 6 and figure 3. 5.3.2.2 voltage spikes exported vehicle system voltage = 23 - 33v. no spikes, outside of normal operating mode were transmitted to converter.
technical datasheet rev d FEMLV-1275 (888) 597-wall www.wallindustries.com page 4 of 9 graph 1: de-rating curve of FEMLV-1275 maximum power derating curve during mil-std-1275d 100v pulse 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 -40-200 20406080100 ambient temperature degrees celsius output power (watts) max case temperature: 100 degrees celsius max average current (under norma l operating voltages): 15 amps max peak single pulse current less than 50ms (under normal operating voltages): 50 amps
technical datasheet rev d FEMLV-1275 (888) 597-wall www.wallindustries.com page 5 of 9 photo 1: ch1 ? vin; photo 2: ch1 ? vin; ch2 ? vout of lv modu le ch2 ? vout of lv module photo 3: ch1 ? vin; photo 4: ch1 - vin ch2 ? vout photo 5: ch1 ? vin photo 6: ch1 - vin
technical datasheet rev d FEMLV-1275 (888) 597-wall www.wallindustries.com page 6 of 9 figure 1: ripple test set-up figure 2: imported surge test set-up
technical datasheet rev d FEMLV-1275 (888) 597-wall www.wallindustries.com page 7 of 9 figure 3: imported spikes test set-up
technical datasheet rev d FEMLV-1275 (888) 597-wall www.wallindustries.com page 8 of 9 figure 4: mechanical dimensions unit: inches [mm] 2.000 50.80 .18 4.7 00 .350 8.89 .700 17.78 .42 10.7 cover see note-6 6 5 4 3 1 2 pin designations for reference only .02 standoff feet 4x 0.5 see note-2 & 3 .20 min [5.1 min] .51 13 label serial no: date code .01 fim a 1.860 47.24 1.030 26.16 .26 6.5 2.37 60.2 .26 6.5 1.54 39.1 case see notes-5 .112 (no:4)-40 unc-2b 4x .10 [2.5] max screw depth from surface-a max receiving torque: 6.0 lbs/in [0.68 n/m] heat-sink surface ref. pin-2 soldered to cover ref. 1. 3d model drawing ml106546 available. 2. pin to pin tolerance: +/- .010 [+/- 0.25]. 3. pin diameter tolerance: +/- .005 [+/- 0.13]. 4. unit has 6-side shielding. 5. case material: .040 [1.02] thick, aluminum. finish: anodized. 6. cover material: steel. finish: tin plated to meet rohs. pin designation table notes: pin description pin dia. 1 + vin .062 [1.54] 2 chassis ground .040 [1.02] 3 -vin .062 [1.54] 4 +vout .062 [1.54] 5 enable .062 [1.54] 6 -vout .062 [1.54] do not scale drawing third angle projection interpret dimensions and tolerances per asme y14.5m - 1994 all dim are in inches [xx] are in millimeters applied tolerances unless otherwise specified .xx= .02 [0.3] .xxx= .010 [0.25] angles 1
technical datasheet rev d FEMLV-1275 (888) 597-wall www.wallindustries.com page 9 of 9 company information: wall industries, inc. has created custom and modified units for over 50 years. our in-house research and development engineers will provide a solution that exceeds your perfo rmance requirements on time and on budget. our iso9001-2008 certification is just one example of our commitment to produc ing a high quality, well-documented product for our customers. our past projects demonstrate our commitment to you, our cu stomer. wall industries, inc. has a reputation for working closely with its customers to ensure each solution meets or exceeds form, fit and f unction requirements. we will continue to provide ongoing support for your project a bove and beyond the design and production phases. give us a call today to discuss your future projects. contact wall industries for further information: phone: ? (603)778-2300 toll free: ? (888)587-9255 fax: ? (603)778-9797 e-mail: sales@wallindustries.com web: www.wallindustries.com address: 5 watson brook rd. exeter, nh 03833
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