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| FEATURES * * * * * * * * * * * -55C to + 85C operation 19 to 40 VDC input Fully Isolated Optocoupler feedback Fixed frequency, 245 kHz typical Topology - Push-Pull Forward 50 V for up to 50 ms transient protection Inhibit/sync function Indefinite short circuit protection Remote sense on single models Up to 84% efficiency DC/DC CONVERTERS 28 VOLT INPUT MFW SERIES 70 WATTS MODELS VDC OUTPUT SINGLE DUAL TRIPLE 5 12 +5 & 12 12 15 +5 & 15 15 Size (max.): 3.20 x 2.46 x 0.595 inches (81.3 x 62.5 x 15.11 mm) See Section B8, case L, for dimensions. Weight: 140 grams typical Screening: Standard or ES.See Section C2 for screening options, see Section A5 for ordering information. DESCRIPTION WIDE VOLTAGE RANGE The MFW SeriesTM of DC/DC converters offers up to 70 watts of power from single, dual, or triple outputs in one package. Using hybrid thick film technology a power density of over 20 watts per cubic inch is achieved. These devices are packaged in hermetically sealed cold rolled steel enclosures with a tin plate finish making them ideal for use in military, aerospace, or other high reliability applications. Unscreened models are guaranteed to pass a gross leak test (maximum leak rate of 0.001 atm-cc/sec). Environmentally screened units (designated by the /ES suffix) are hermetically solder sealed. See Section C2 for screening specifications. All models of the MFW Series are designed to provide full power operation over an input voltage range of 19 to 40 VDC. Operation below an input of 19 volts, including operation in MIL-STD-704E emergency power conditions, is possible with derated output power. Please refer to the derating information and the low voltage drop-out graphs (Figures 10 and 11) on the following pages. WIDE TEMPERATURE RANGE Full load operation of any of the MFW Series converters is available at case temperatures of -55C to + 85C. Operation up to +125C is possible with derated output power. The MFW Series converters are provided in a flange mount case designed to facilitate the removal of internally generated heat. Because of this, heat sinking requirements are minimal. Sustained full power operation does however require that an efficient heat sink be attached to the baseplate. Please refer to the heat sink requirements section for more information. DESIGN METHODOLOGY The MFW Series converters utilize a quasi-square wave forward converter design with a nominal switching frequency of 245 kHz. Isolation between input and output is provided with a transformer in the forward power loop and a wideband, temperature insensitive optical link in the feedback control loop. Output regulation is accomplished with constant frequency pulse width modulation. In addition, the load regulation of the single output models is further enhanced through the use of remote output voltage sense pins to overcome the adverse effects of line resistance voltage drops. Short circuit protection is provided by detecting peak primary switching current on a cycle by cycle basis and limiting it to approximately 130% of the full load input current. This method results in quick and positive current limiting under short circuit conditions. INHIBIT/SYNC FEATURE Standard on all models of the MFW Series is a dual mode inhibit/sync pin. This pin serves as both an output inhibit and as a synchronization input. In the inhibit mode an open collector TTL compatible low (<0.8 V) will disable internal switching thereby inhibiting the unit's output. Inhibiting in this manner results in an extremely low quiescent current. Since a pull-up resistor is included internally, this pin may be left open should the inhibit function not be desired. In a digital system it is often desirable to synchronize the input or output ripple with the system clock. For this reason each model of the MFW Series was designed to synchronize with a system clock applied to the inhibit/sync pin. Please refer to the technical data section for timing details for the external sync feature. LOW NOISE The MFW Series converters offer low noise on both the input and output lines. A two section, four pole LC input filter is included to provide very low reflected line ripple current. Adherence to MILSTD-461C (CE03) is possible with the addition of the FMB-461 filter. Output ripple is maintained at less than 50 mV p-p for single and dual output models and 85 mV for triple output models. B4-3 MFW SERIES 70 WATT ABSOLUTE MAXIMUM RATINGS DC/DC CONVERTERS SYNC AND INHIBIT Sync In (245 to 370 kHz.) * Duty cycle 70% min, 98% max * Logic low 0.8 V max * Logic high 4.5 V min * Referenced to input common * If sync is not used, leave unconnected Inhibit TTL Open Collector * Logic low (output disabled) Inhibit pin current 1 mA max * Referenced to input common * Logic high (output enabled) V = 4.5 V TYPICAL CHARACTERISTICS Output Voltage Temperature Coefficient * 150 ppm/C, typical Input to Output Capacitance * 160 pF, typical Isolation * 100 megohm minimum at 500 V Conversion Frequency * Free run mode 245 kHz, typical Inhibit Pin Voltage (unit enabled) * 4.5 to 5.5 V Output Power * 60 to 70 watts depending on model Lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * -55C to +125C RECOMMENDED OPERATING CONDITIONS Input Voltage Range * 19 to 40 VDC continuous (see Derating) Case Operating Temperature (Tc) * -55C to +85C full power 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 85C to 0% at 125C. * Above 105C linearly derate steady state input voltage to 33 volts at 125C. * Indefinite short circuit protection is not guaranteed above 85C case. * Operation below an input voltage of 19 volts, including operation in MILSTD-704E emergency power conditions, is possible with derated output power. See Figures 10 and 11. Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. SINGLE OUTPUTS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT POWER OUTPUT RIPPLE LINE REGULATION LOAD REGULATION INPUT VOLTAGE INPUT CURRENT INPUT REFL. RIPPLE EFFICIENCY STARTUP DELAY CONDITION FULL LOAD VIN = 19 TO 40 Tc = -55C TO +85C FULL LOAD BW 2 MHz VIN = 19 TO 40 NO LOAD TO FULL MFW2805S MIN 4.95 -- -- -- -- -- 19 NO LOAD INHIBITED FULL LOAD BW 10 MHz WITH LOW IMPEDANCE SOURCE -- -- -- 78 -- TYP 5.00 -- -- 30 10 10 28 75 30 10 80 5 MAX 5.05 12.00 60 50 20 20 40 90 35 25 -- 10 MFW2812S MIN TYP MAX MFW2815S MIN. TYP MAX UNITS VDC A W mV p-p mV mV VDC mA mA p-p % ms 11.88 12.00 12.12 -- -- -- -- -- 19 -- -- -- 81 -- -- -- 30 10 10 28 70 30 10 83 8 5.83 70 50 20 25 40 90 35 25 -- 10 14.85 15.00 15.15 -- -- -- -- -- 19 -- -- -- 81 -- -- -- 30 10 10 28 70 30 10 83 8 4.67 70 50 20 25 40 90 35 25 -- 10 B4-4 DC/DC CONVERTERS DUAL AND TRIPLE OUTPUTS PARAMETER OUTPUT VOLTAGE CONDITION FULL LOAD MAIN DUAL MAIN DUAL MIN MFW2812D TYP MAX -- -- -- 11.88 12.00 12.12 -- -- -- -- -- MAIN DUAL MAIN DUAL MAIN DUAL -- -- -- -- -- -- -- 2.92 -- 35 -- -- 30 -- 10 -- 25 -- 5.5 -- 66.5 70 -- 50 -- 25 -- 50 MFW2815D MIN TYP MAX MIN MFW28512T TYP MAX MIN MFW SERIES 70 WATT MFW28515T TYP MAX UNITS VDC Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. -- -- -- 4.95 5.05 5.10 4.90 4.95 5.05 14.85 15.00 15.15 11.65 11.80 12.05 15.05 15.30 15.55 -- -- -- -- -- -- -- -- -- -- -- -- 2.33 -- 35 -- -- 30 -- 10 -- 25 -- 4.4 -- 66.5 70 -- 50 -- 25 -- 50 -- -- -- -- -- -- -- -- -- -- -- 4.0 1.67 20 20 -- 50 50 2 100 5 480 10.0 4.2 50 50 60 85 85 20 200 20 600 -- -- -- -- -- -- -- -- -- -- -- 4.0 1.33 20 20 -- 50 50 2 100 5 300 10.0 3.33 50 50 60 85 85 20 200 20 450 OUTPUT VIN = CURRENT1, 2 19 TO 40 OUTPUT POWER1, 2 OUTPUT RIPPLE MAIN DUAL TOTAL FULL LOAD BW 2 MHz A W mV p-p mV mV LINE VIN = REGULATION 19 TO 40 NO LOAD LOAD3 REGULATION TO FULL CROSS4 DUAL REGULATION +PO = 3 W TO 35 W -PO = 35 W +PO = 20 W TO 50 W -PO = 50 W TO 20 W MAIN +PO = 33 W CROSS5 REGULATION DUAL +PO = 3 W TO 27 W -PO = 27 W TO 3 W MAIN +PO = 3 W TO 30 W DUAL PO = 15 W INPUT VOLTAGE INPUT CURRENT INPUT REFL. RIPPLE EFFICIENCY STARTUP DELAY NO LOAD INHIBITED FULL LOAD BW 10 MHz -- -- 1.5 2.0 3.0 4.0 -- -- 1.5 2.0 3.0 3.5 -- -- -- -- -- -- -- -- -- -- -- % -- -- -- -- -- -- -- -- 2.3 6.0 -- 2.3 5.0 % -- 19 -- -- -- 80 -- -- 28 75 30 15 83 15 -- 40 90 35 40 -- 25 -- 19 -- -- -- 80 -- -- 28 75 30 15 83 15 -- 40 90 35 40 -- 25 -- 19 -- -- -- 80 -- 5.4 28 60 30 15 84 6 9.0 40 110 35 40 -- 10 -- 19 -- -- -- 80 -- 5.0 28 60 30 15 84 6 7.0 40 110 35 40 -- 10 VDC mA mA p-p % ms Notes 1. On dual output models the maximum combined output power is 70 watts. A maximum of 95% (66.5 W) is available from any single output. 2. On triple output models the maximum combined output power is 60 watts. A maximum of 50 watts is available from a single output. 3. Balanced loads. 4. Regulation effect on the negative dual output during the defined conditions. 5. Regulation effect on both dual outputs during the defined conditions. B4-5 MFW SERIES 70 WATT DC/DC CONVERTERS THERMAL MANAGEMENT HEAT SINK RECOMMENDATIONS An MFW Series converter in still air (other than convective currents) and with no conductive cooling paths other than through electrical connections at the pins will exhibit a thermal resistance of approximately 4C / watt. In cases where this value proves to be too high it is recommended that additional heat sinking be supplied. The simplest method of accomplishing this is to firmly attach the converter to a PCB thereby providing a conductive thermal path. Secondly it is recommended that airflow be provided over the converter. Although each situation requires a thorough thermal analysis these two measures can reduce the thermal resistance to as low as 2C / watt. If calculations indicate further heat sinking is required it is recommended that additional thermal mass be provided either under the base plate or on top of the converter's mounting flanges or both. CALCULATING MAXIMUM AMBIENT TEMPERATURE The MFW Series of DC/DC converters has an upper operating temperature of + 85C at the baseplate of the case. The degree of heat sinking required to remain within this limit may be determined from Figure 1 which shows the maximum allowed internal power dissipation (PDISS vs. ambient temperature for various heat sink thermal resistances. PDISS may be calculated as: PDISS = POUT / efficiency - POUT The efficiency for all combinations of POUT and VIN for the various models may be obtained from the graphs on the preceding pages. Example: Converter = MFW2815D, TAMB = 70C, VIN = 28 VDC, POUT = 45 watts Efficiency = 85% (From Figure 7) PDISS = (45 / 85) - 45 = 7.95 watts From Figure 1 we can see that this situation will require thermal resistance of approximately 4.5C / watt. Conversely we may also find the maximum ambient temperature which can be tolerated if we know the heat sink thermal resistance. Example: Converter = MFW2805S, VIN = 28 VDC, POUT = 45 W. Thermal Resistance = 3C / watt. Efficiency = 83.5% (From Figure 3) PDISS = (45 / 0.835) - 45 = 8.89 watts. From Figure 1 we can see that the maximum allowed ambient temperature is approximately 75C. 20 U= W /W C/W C/W C/ 4CU=3 U=2 U=0 15 Watts 10 5 20 40 60 80 100 120 140 Degrees Centigrade Internal Power Dissipation (max) vs. Ambient Temperature FIGURE 1 B4-6 DC/DC CONVERTERS PIN OUT MFW SERIES 70 WATT Squared corner indicates pin one. 1 2 3 4 Pin 1 2 3 4 5 6 7, 8 9, 10 Single Output Positive Input Case Ground Input Common Inhibit/Sync In Negative Sense Positive Sense Output Common Positive Output Dual Output Positive Input Case Ground Input Common Inhibit/Sync In Negative Output Positive Output Triple Output Positive Input Case Ground Input Common Inhibit/Sync In Negative Aux. Output Positive Aux. Output BOTTOM VIEW MFW Output Common Output Common No Connection Main (+5) Output See Section B8, case L, for dimensions. 9 7 5 10 8 6 FIGURE 2: PIN OUT MODEL NUMBERING KEY MFW Base Model Input Voltage Output Voltage (Main and Aux. Vout for triple models) Number of Outputs (S = single, D = dual, T = triple) Screening (Standard screening has no designator in this position.) 28 512 T / ES B4-7 MFW SERIES 70 WATT 86 20 V 85 84 DC/DC CONVERTERS 89 19 V 88 87 89 19 V 88 87 Typical Performance Curves: 25C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. Efficiency (%) 83 82 81 80 40 V 79 78 10 20 30 40 50 60 70 Efficiency (%) 86 85 84 28 V 83 40 V 82 81 10 20 30 40 50 60 70 Efficiency (%) 28 V 86 85 84 28 V 83 40 V 82 81 10 20 30 40 50 60 70 Output Power (Watts) Output Power (Watts) Output Power (Watts) MFW2805S Efficiency vs Line & Load MFW2812S Efficiency vs Line & Load MFW2815S Efficiency vs Line & Load FIGURE 3 87 19 V 85 85 87 FIGURE 4 87 19 V 85 83 FIGURE 5 19 V Efficiency (%) 83 83 Efficiency (%) Efficiency (%) 81 79 28 V 77 75 40 V 73 71 10 20 30 40 50 60 70 81 79 77 75 40 V 73 71 10 20 30 40 50 60 70 28 V 81 79 77 75 73 40 V 71 10 20 30 40 50 60 70 28 V Output Power (Watts) Output Power (Watts) Output Power (Watts) MFW2812D Efficiency vs Line & Load MFW2815D Efficiency vs Line & Load MFW28512T Efficiency vs Line & Load FIGURE 6 87 85 FIGURE 7 19 FIGURE 8 MFW2815D 2815S 19 V 18 Input Voltage (Volts) 83 283R5S 17 Input Voltage (Volts) 18 MFW2812D Efficiency (%) 81 28 V 79 77 75 73 71 10 20 30 40 50 60 70 40 V 16 2812S 2805S 17 16 MFW28512T MFW28515T 15 15 10 20 30 40 50 60 70 10 20 30 40 50 60 70 Output Power (Watts) Output Power (Watts) Output Power (Watts) MFW28515T Efficiency vs Line & Load Low Line Dropout vs. Load (50 mV drop) MFW Single Output Models Low Line Dropout vs. Load (50 mV drop) MFW Dual and Triple Output Models FIGURE 9 FIGURE 10 FIGURE 11 B4-8 20621-001-DTS Rev A DQ# 1016 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. MFW Series is a trademark of Interpoint. Copyright (c) 1991- 1999 Interpoint. All rights reserved. CASES CASE L 0.060 min (1.52) 3.20 max (81.3) CASE L TOP VIEW Cover Placement and Min/Max Dimensions See Figure 50 for pin configuration 0.060 min (1.52) 2.46 max (62.5) 0.337 min (8.56) 0.337 min (8.56) Squared corner indicates pin one Materials Header Cold Rolled Steel/Nickel/Tin Cover Cold Rolled Steel/Nickel/Tin Pins #52 alloy pins 1-4, and 9-10 #52 alloy with copper core pins 5-8 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 CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300C for 10 seconds per pin. FIGURE 49: CASE L MAXIMUM DIMENSIONS B8-31 CASE L CASES CASE L MFW Series: Screening - Standard or ES HR700 Series: no screening options Squared corner indicates pin one Solder Seal 0.141 x 6 (3.58) 2.850 (72.39) 1 .0.040 +0.005/-0.002 (1.02 +0.13/-0.05) 2 3 4 BOTTOM VIEW 1.600 (40.64) Solder Tip-off 0.550 (13.97) 0.350 (8.89) 9 7 5 10 0.000 8 6 0.040 +0.007/-0.000 (1.02 +0.18/-0.00) 0.595 max (15.11) 0.250 +0.05/-0.00 (6.35 +1.3/-0.0) 0.00 0.180 (4.57) 0.000 0.625 (15.88) 0.825 (20.96) 1.025 (26.04) 1.325 (33.66) 1.425 (36.20) 1.625 (41.28) FIGURE 50: CASE L DIMENSIONS B8-32 2.280 (57.91) QA SCREENING 85C PRODUCTS 85C PRODUCTS TEST (85C Products excluding HR products) PRE-CAP INSPECTION Method 2017 TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55C to 125C CONSTANT ACCELERATION Method 2001, 500 g BURN-IN 96 hours at 70C ambient (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25C case HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) FINAL VISUAL INSPECTION Method 2009 yes yes no no yes yes yes no yes yes no yes no yes no yes yes yes STANDARD /ES Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. Applies to the following products: 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 C2-12 |
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