|Category||Power Management => DC-DC Converters|
|Datasheet||Download MFW datasheet
+ 85°C operation to 40 VDC input Fully Isolated Optocoupler feedback Fixed frequency, 245 kHz typical Topology Push-Pull Forward 50 V for 50 ms transient protection Inhibit/sync function Indefinite short circuit protection Remote sense on single models to 84% efficiency
Size (max.): x 0.595 inches 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.
The MFW SeriesTM of DC/DC converters offers 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 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.
Full load operation of any of the MFW Series converters is available at case temperatures + 85°C. Operation +125°C 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.
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.
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.
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 (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.
Sync 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) 4.5 V
Output Voltage Temperature Coefficient 150 ppm/°C, typical Input to Output Capacitance 160 pF, typical Isolation 100 megohm minimum 500 V Conversion Frequency Free run mode 245 kHz, typical Inhibit Pin Voltage (unit enabled) 5.5 V
Output Power to 70 watts depending on model Lead Soldering Temperature (10 sec per lead) 300°C Storage Temperature Range (Case) to +125°C
Input Voltage Range to 40 VDC continuous (see Derating) Case Operating Temperature (Tc) to +85°C full power
Temperatures are referenced to the temperature at the converter's baseplate Linearly derate output power/current from at 125°C. Above 105°C linearly derate steady state input voltage to 33 volts at 125°C. Indefinite short circuit protection is not guaranteed above 85°C 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: 25°C 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 TO +85°C FULL LOAD BW 2 MHz VIN 40 NO LOAD TO FULL MFW2805S MIN 19 NO LOAD INHIBITED FULL LOAD BW 10 MHz WITH LOW IMPEDANCE SOURCE 78 TYP MAX MFW2812S MIN TYP MAX MFW2815S MIN. TYP MAX UNITS VDC W mV p-p mV VDC mA p-p % ms
DUAL AND TRIPLE OUTPUTS PARAMETER OUTPUT VOLTAGE CONDITION FULL LOAD MAIN DUAL MAIN DUAL MIN MFW2812D TYP MAX ±12.00 ±12.12 MAIN DUAL MAIN DUAL MAIN DUAL MFW2815D MIN TYP MAX MIN MFW28512T TYP MAX MINOUTPUT VIN TO 40 OUTPUT POWER1, 2 OUTPUT RIPPLE MAIN ±DUAL TOTAL FULL LOAD BW 2 MHz
DUAL REGULATION +PO 35 W PO 35 W +PO 50 W PO 20 W MAIN +PO W CROSS5 REGULATION DUAL +PO 27 W PO 3 W MAIN +PO 30 W DUAL ±PO 15 W INPUT VOLTAGE INPUT CURRENT INPUT REFL. RIPPLE EFFICIENCY STARTUP DELAY NO LOAD INHIBITED FULL LOAD BW 10 MHz
Notes 1. On dual output models the maximum combined output power is 70 watts. A maximum 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.
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