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SMFLH2815SHO Datasheet(PDF) 1 Page - Crane Aerospace & Electronics. |
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SMFLH2815SHO Datasheet(HTML) 1 Page - Crane Aerospace & Electronics. |
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1 / 13 page  DESCRIPTION The SMFLHP Series™ 28 volt DC/DC converters are rated up to 100 watts 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 posi- tive or negative outputs. Current sharing allows the units to be paralleled for total power of up to 228 watts. The welded, hermet- ically sealed package is only 3.005 x 1.505 x 0.400 inches, giving the series an overall power density of up to 67 watts per cubic inch. SCREENING SMFLHP converters offer screening options to Space Prototype (O), Class H, or Class K. Radiation tolerant to Radiation Hardness Assurance (RHA) levels of “-” (O), “P” or “R”, per MIL- STD-38534. Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash) Radiation Hardness Assurance level of MIL-PRF-38534, which is defined as “no RHA”. See “Class H and K, QML Screening” tables for more information. DESIGN FEATURES The SMFLHP 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 wide bandwidth magnetic coupling in the feedback control loop. The SMFLHP Series uses a unique dual loop feedback technique that controls output current with an inner feedback loop and 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. Tight load regulation is achieved through a wide-bandwidth magnetic feedback circuit. The output voltage on single SMFLHP models can be easily trimmed up by adding an external resistor. (See Figure 2 for voltage changes with different resistor values.) INHIBIT The SMFLHP Series converters have two inhibit terminals (INH1 and INH2) that can be used to disable power conversion, resulting in a very low quiescent input current. A low (<0.8 volts) is required between INH1 (pin 4) and Input Common (pin 2) to inhibit the converter. A low (<0.5 volts) is required between INH2 (pin 12) and Output Common (pin 8) to inhibit the converter. The application of intermediate voltages to these pins (1.5 to 10.5 volts) should be avoided. CURRENT SHARING AND PARALLEL OPERATION Multiple SMFLHP converters may be used in parallel to drive a common load (see Figure 3). In this mode of operation the load current is shared by two or three SMFLHP converters. In current sharing mode, one SMFLHP 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) of the master unit. Figure 3 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 SMFLHP converters are available at the load. Overload and short circuit performance are not adversely affected during parallel operation. FEATURES • Fully qualified to Class H or K • –55°C to +125°C operation • 19 to 40 VDC input • Fully Isolated • Magnetic feedback • Fixed frequency, 600 kHz typical • Topology – Single Ended Forward • Inhibit function – input and output • Sync function • Output trim on single output models • Indefinite short circuit protection • Remote sense on single output models • Up to 87% efficiency • May be paralleled up to 228 watts MODELS VDC OUTPUT SINGLE 3.3 5 12 15 DUAL ±5 ±12 ±15 Crane Aerospace & Electronics Power Solutions SMFLHP Single and Dual DC/DC Converters Crane Aerospace & Electronics Electronics Group (Interpoint Brand) PO Box 97005 • Redmond WA 98073-9705 425.882.3100 • electronics@craneae.com www.craneae.com Page 1 of 13 Rev H - 20071221 28 VOLT INPUT – 100 WATT |
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