TECHNICAL DATASHEET Rev B FEMFA-1275 MIL-STD-1275D Front End Filter Module for FA 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 350 Watts • Allows FA Series to Operate Through MIL-STD-1275 Disturbances • Mass 0.190lbs DESCRIPTION The Wall Industries Front End Filter Module (FEMFA-1275) was designed with the FA Series DC-DC converters in mind. This Module will allow an FA series DC-DC converter 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. (888) 597-WALL www.wallindustries.com 1 of 9 TECHNICAL DATASHEET Rev B FEMFA-1275 MIL-STD-1275D Test Results Detailed Requirements Test Conditions 5.1.2.1 Starting Disturbances 5.1.2.2 Vehicle System Voltage Initial Engagement Surges pulsed to 6V for less than 1 Second. 5.1.2.3 Cranking Level 5.1.3 Normal Operation Mode 5.1.3.1 Steady-state Voltage Detailed Results Figure or Picture No damage to converter. Photo 1. Converter operates normally before, and after. Vehicle System Voltage at No damage to converter. Photo 2. 16V for 30 Seconds. Converter operates Returned to 28V for 1 normally before, and after. Minute 30 Seconds, and repeated 2 more times. 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, 70µS duration No damage to converter. Converter operates normally before, during, and after. Photo 6 and Figure 3. (888) 597-WALL www.wallindustries.com Page 2 of 9 Rev B 5.1.4 Generator-Only Mode 5.1.4.1 Steady-State Voltage TECHNICAL DATASHEET FEMFA-1275 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. (888) 597-WALL www.wallindustries.com Page 3 of 9 TECHNICAL DATASHEET Rev B FEMFA-1275 Graph 1: De-rating Curve of FEMFA-1275 Output power (watts) Maximum power Derating Curve during MIL-STD-1275D 100v pulse 200 190 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 -40 -20 0 20 40 60 80 100 Ambient Temperature Degrees Celsius Max case temperature: 100 degrees Celsius Max average current (under normal operating voltages): 15 amps Max peak single pulse current less than 50ms (under normal operating voltages): 50 amps *Due to advances in technology, specifications subject to change without notice. (888) 597-WALL www.wallindustries.com Page 4 of 9 Rev B TECHNICAL DATASHEET FEMFA-1275 Photo 1: Ch1 – Vin; Ch2 – Vout of FA Module Photo 2: Ch1 – Vin; Ch2 – Vout of FA Module Photo 3: Ch1 – Vin; Ch2 – Vout Photo 4: Ch1 - Vin Photo 5: Ch1 – Vin Photo 6: Ch1 - Vin (888) 597-WALL www.wallindustries.com Page 5 of 9 Rev B TECHNICAL DATASHEET FEMFA-1275 Figure 1: Ripple Test Set-Up Figure 2: Imported Surge Test Set-Up (888) 597-WALL www.wallindustries.com Page 6 of 9 Rev B TECHNICAL DATASHEET FEMFA-1275 Figure 3: Imported Spikes Test Set-Up (888) 597-WALL www.wallindustries.com Page 7 of 9 Rev B TECHNICAL DATASHEET FEMFA-1275 Figure 4: Mechanical Dimensions Unit: inches [mm] (888) 597-WALL www.wallindustries.com Page 8 of 9 Rev B TECHNICAL DATASHEET FEMFA-1275 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 performance requirements on time and on budget. Our ISO9001-2008 certification is just one example of our commitment to producing a high quality, welldocumented product for our customers. Our past projects demonstrate our commitment to you, our customer. Wall Industries, Inc. has a reputation for working closely with its customers to ensure each solution meets or exceeds form, fit and function requirements. We will continue to provide ongoing support for your project above and beyond the design and production phases. Give us a call today to discuss your future projects. Contact Wall Industries for further information: Phone: Toll Free: Fax: E-mail: Web: Address: (888) 597-WALL (603)778-2300 (888)587-9255 (603)778-9797 [email protected] www.wallindustries.com 5 Watson Brook Rd. Exeter, NH 03833 www.wallindustries.com Page 9 of 9