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MSR28512D Datasheet(PDF) 1 Page - Crane Aerospace & Electronics. |
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MSR28512D Datasheet(HTML) 1 Page - Crane Aerospace & Electronics. |
1 / 6 page B4-27 MODELS VDC OUTPUT FEATURES • –55°C to +85°C operation • 16 to 32 VDC input • Fully isolated • Opto-coupler feedback • Switching frequency Single and dual outputs typical 80 kHz, variable freq. Triple output - 200 kHz, fixed • Topology – Flyback • 40 V for 50 ms transient protection • Inhibit function • Indefinite short circuit protection • Up to 70% efficiency • External capacitors required SINGLE 5 DUAL ±12 ±15 TRIPLE +5 & ±12 +5 & ±15 DESCRIPTION The MSR Series™ DC/DC converters provide the high efficiencies associated with switching regulators, yet have full isolation between input and output. Interpoint builds the MSR converters using thick- film hybrid technology and seals them in metal packages for military, aerospace, and other high-reliability applications. The solder sealed packages of the standard models pass a dip gross leak hermeticity test. Environmentally screened models pass a fine leak hermeticity test. See Section C2 for a complete list of screening options. CONVERTER DESIGN A footprint of just over one square inch makes the MSR Series DC/DC converters one of Interpoint’s smallest converters. These converters incorporate a flyback topology which requires a minimum of components resulting in small package size. Single and dual models self-oscillate at an operating frequency which is an approx- imate inverse function of the load. At full load, the frequency is typi- cally 80 kHz for single and dual output models. Triple output models operate at a fixed frequency of approximately 200 kHz. A trans- former in the forward power circuit and an opto-coupler in the feed- back/control loop maintain input to output isolation. CONVERTER OPERATION MSR Series DC/DC converters feature an input voltage range of 16 to 32 VDC and can withstand a transient of up to 40 V for up to 50 msec. They offer a choice of five different output voltage (VDC) configurations: +5 , ±12 , ±15, +5 main with ±12 auxiliaries, and +5 main with ±15 auxiliaries. Dual output models deliver up to 4 watts for either balanced or unbalanced loads, however, at least 25% of the total load should be on the positive output. The single output model supplies up to 3.5 watts of output power while the triple output models supply up to 3.2 watts. The high efficiency remains almost constant over the entire input voltage range and from approximately 25% of full load to full load. This makes the MSR Series converters ideal for either battery or aircraft power applications. INHIBIT FUNCTION The open collector TTL compatible inhibit terminal is referenced to input common. Inhibiting the converter by pulling the inhibit terminal (pin 15) low results in an input current as low as 2 mA for the MSR2805S. The inhibit terminal has an open circuit voltage of 12 to 28 V. SHORT CIRCUIT PROTECTION Each output has current limiting circuitry for indefinite short circuit protection providing that the case temperature does not exceed the specified limits. Under short circuit conditions the input current is reduced to less than full load input current and the output short circuit current remains higher than full load output current. MINIMAL HEAT SINKING The MSR Series converters’ high efficiency minimizes heat sinking requirements, but care should be taken to remove self-generated heat to prevent exceeding the maximum case temperature. Heat conducting material (PCB, copper sheet, heat sink, etc.) in contact with the converter’s baseplate can help to increase heat dissipation. The converter can be operated at full load at a case temperature of 85°C, with the output power derated linearly to zero at 115°C. WARNING:EXTERNAL CAPACITORS REQUIRED External capacitors are required on the outputs. Operating the unit without external capacitors will result in damage to the internal circuitry. Minimum recommended capacitor values are given in Tables 1 and 2. For optimum performance, low ESR (Equivalent Series Resistance) solid tantalum capacitors are required. The specifications on the following pages are based on the use of high- quality solid tantalums. Operation with different types of capacitors will seriously affect performance. DC/DC CONVERTERS 28 VOLT INPUT MSR SERIES 4 WATT Size (max.): 1.075 x 1.075 x 0.370 inches (27.31 x 27.31 x 9.40 mm). See Section B8, case C2, for dimensions. Weight: 20 grams maximum. Screening: Standard or ES.See Section C2 for screening options, see Section A5 for ordering information. |
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