SMFL2815S

Crane Aerospace & Electronics Power Solutions sMFL single and dual dc/dc converters 28 VoLt input – 65 Watt Features • Operating temperature -55° to +125°C parallel operation with current share, up to 3 units (148 watts) • Qualified to MIL-PRF-38534 Class H and K • Input voltage range 16 to 40 VDC • Fully isolated, magnetic feedback • Fixed high frequency switching • Inhibit function • Radiation hardness assurance (RHA) to level R 100 kRad(Si) • Transient protection 50 V for 120 ms VDc OutPut SINgLe 3.3 5 12 15 DuAL ±5 ±12 ±15 MODeLS • Remote sense and output trim on single output models • Synchronization input and output • Indefinite short circuit protection • High power density, 85% efficiency description The SMFL Series™ 28-volt DC/DC converters are rated up to 65 watts output power over a -55° 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 outputs. Current sharing allows the units to be paralleled for total power of up to 148 watts. The welded, hermetically sealed package is only 3.0 x 1.5 x 0.40 inches, giving the series an overall power density of up to 43 watts per cubic inch. similar to primary current mode control and allows for ease of paralleling, but without the cost and complexity. The 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 voltage on single SMFL models can be trimmed to a specific output voltage by adding an external resistor (see Figure 1 for resistor values). Screening SMFL converters, also available on SMD drawings, offer the following screening options: Space Prototype (O), Class H, or Class K. Radiation tolerant to Radiation Hardness Assurance (RHA) levels of “-” (O), “P,” or “R,” per MIL-PRF-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 Screening Tables 1 - 3 for more information. inhibit DeSign FeatureS The SMFL 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 and no generation of switching noise. An active low (