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MFL2812D Dataheets PDF



Part Number MFL2812D
Manufacturers Interpoint
Logo Interpoint
Description (MFL Series) DC/DC Converters
Datasheet MFL2812D DatasheetMFL2812D Datasheet (PDF)

FEATURES • • • • • • • • • • • • • • w w at .D w –55° to +125°C operation 16 to 40 VDC input Fully Isolated Magnetic feedback Fixed frequency, 600 kHz typical Topology – Single Ended Forward 50 V for up to 50 ms transient protection Inhibit (input & output side) Sync function (in and out) Output trim on single output models Indefinite short circuit protection Remote sense on single output models Up to 87% efficiency / 43 W/in3 Parallelable up to 148 watts h S a t e e 4U DC/DC CONVERTERS .

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FEATURES • • • • • • • • • • • • • • w w at .D w –55° to +125°C operation 16 to 40 VDC input Fully Isolated Magnetic feedback Fixed frequency, 600 kHz typical Topology – Single Ended Forward 50 V for up to 50 ms transient protection Inhibit (input & output side) Sync function (in and out) Output trim on single output models Indefinite short circuit protection Remote sense on single output models Up to 87% efficiency / 43 W/in3 Parallelable up to 148 watts h S a t e e 4U DC/DC CONVERTERS m 28 VOLT INPUT o .c MFL SERIES 65 WATT MODELS VDC OUTPUT SINGLE 5 12 15 28 DUAL ±5 ±12 ±15 Size (max): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) Case U Weight: 100 grams maximum Screening: Standard, ES, or 883 (Class H). DESCRIPTION The MFL Series™ 28-volt DC/DC converters are rated up to 65 watts of output power over a –55°C to +125°C temperature range with a 28 Vdc nominal input. On dual output models up to 70% of the rated output power can be drawn from either the positive or negative output. Current sharing allows the units to be paralleled for total power of up to 148watts. The welded, hermetically sealed package is only 3.005 x 1.505 x 0.400 inches, giving the series an overall power density of up to 43 watts per cubic inch. INHIBIT DESIGN FEATURES The MFL Series converters are switching regulators that use a quasi-square wave, single ended forward converter design with a constant switching frequency of 600 kHz. Isolation between input and output circuits is provided with a transformer in the forward path and a wide bandwidth magnetic coupling in the feedback control loop. The MFL uses a unique dual loop feedback technique that controls output current with an inner feedback loop and an output voltage with a cascaded voltage mode feedback loop. The additional secondary current mode feedback loop improves transient response in a manner similar to primary current mode control and allows for ease of paralleling, but without the cost and complexity. The cascaded constant frequency, pulse-width modulated converters use a quasi-square wave single-ended forward design. Tight load regulation is achieved through a wide-bandwidth magnetic feedback circuit. The output on single MFL models can be trimmed (see Figure 1 for voltage changes with different resistor values). w ® w w t a .D S a The MFL Series converters have two TTL compatible inhibit terminals (INH1 and INH2) that can be used to disable power conversion, resulting in a very low quiescent input current and no generation of switching noise. An open collector TTL compatible low (<0.8 volts) is required to inhibit the converter between INH1 (pin 4) and Input Common (pin 2). An open collector TTL compatible low (<0.5 volts) is required to inhibit the converter between INH2 (pin 12) and Output Common (pin 8). The application of intermediate voltages to these pins (1.5 to 10.5 volts) should be avoided. e h U 4 t e .c m o CURRENT AND PARALLEL OPERATION Multiple MFL converters may be used in parallel to drive a common load (see Figure 2). In this mode of operation the load current is shared by two or three MFL converters. In current sharing mode, one MFL converter is designated as a master. The SLAVE pin (pin 11) of the master is left unconnected and the MSTR/INH2 pin (pin 12) of the master is connected to the SLAVE pin (pin 11) of the slave units. The units designated as slaves have the MSTR/INH2 pin (pin 12) connected to the SNS RTN pin (pin 9). Figure 2 shows the typical setup for two or three units in parallel. Note that synchronizing the units together (though shown in the figure) is not required for current sharing operation. A second slave unit may be placed in parallel with a master and slave; this requires the TRI pin (pin 3) of the master unit to be connected to the SNS RTN pin (pin 9). When paralleled, 76% of the total combined power ratings of the MFL converters are available at the load. Overload and short circuit performance are not adversely affected during parallel operation. w w w .D a S a t e e h U 4 t m o .c 1 MFL SERIES 65 WATT ABSOLUTE MAXIMUM RATINGS Input Voltage • 16 to 40 VDC Power Dissipation (Pd) • 14 watts (16 watts MFL2805S, MFL2805D) Output Power • 50 to 65 watts depending on model Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –65°C to +150°C DC/DC CONVERTERS SYNC AND INHIBIT (INH1, INH2) Sync In (525 to 675 kHz) • Duty cycle 40% min, 60% max • Logic low 0.8 V max • Logic high 4.5 V min, 9 V max • Referenced to input common • If not used, connect to input common Sync Out • Referenced to input common Inhibit (INH1, INH2) TTL Open Collector • Logic low (output disabled) INH1 referenced to input common Logic low 0.8 V max Inhibit pin current 10 mA max INH2 referenced to output common Logic low 0.5 V max Inhibit pin current 5 mA max • Logic high (output enabled) Open collector TYPICAL CHARACTERISTICS Output Voltage Temperature Coefficient • 100 ppm/°C typical.


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