HR700

NOT RECOMMENDED FOR NEW DESIGNS Features Dc/Dc conVerters 28 Volt input HR700 SERIES 70 WATT • –40°C to + 85°C operation • 19 to 40 VDC input • Fully isolated • 50 V for 50 ms transient protection • Fixed frequency mODELS VDc output Dual ±12 ±15 triple +5 & ±12 +5 & ±15 • Inhibit/sync function • Remote sense on single models • Indefinite short circuit protection • Up to 84% efficiency Size (max.): 3.20 x 2.46 x 0.595 inches (81.3 x 62.5 x 15.11 mm) See case L for dimensions. Weight: 140 grams typical Screening: Standard only. See screening table for more information. description HR700 Series DC/DC converters offer up to 70 watts of power from single, dual, or triple outputs in one package. The converters combine the small size and high reliability of hybrid-based components, the high efficiency of switching regulators, and the isolation, regulation, and low noise characteristics of linear regulators. provided by detecting peak primary switching current on a 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. HR700 Series DC/DC converters are designed to provide full power operation over the input voltage range of 19 to 40 VDC. Operation below an input of 19 volts is possible with derated output power. Outputs are available as 5, 12, and 15 VDC single, dual and triple outputs. The converters typically provide greater than 80% efficiency over the entire input range. Line regulation is typically within 0.1% and load regulation within 0.2%. The HR700 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. Output ripple is maintained at less than 50 mV p-p for single and dual models and 85 mV p-p for triple output models. small size The HR700 converters are manufactured using techniques that provide very small size and low profile components. Each converter uses less than eight square inches of board areas and is 0.595 inches high or less. The overall power density is 20 watts per cubic inch. Assembled using thick-film technology, the HR700 parts use the same manufacturing procedures and quality controls that we apply to converters designed for commercial airliners, the space shuttle, advanced fighter aircraft, and other high reliability applications. The steel cases are hermetically sealed in a dry nitrogen environment and are guaranteed a maximum leak rate of less than 10-3 atm-cc/sec. All devices are 100% electrically tested. The HR700 series parts are high efficiency, low noise, pulse-width modulated converters which use a quasi-square wave forward converter design with a nominal switching frequency of 245 kHz. Isolation between input an output is provided with a transformer in the forward power loop and a wide band, temperature insensitive, optical link in the feedback control loop. Short circuit protection is high reliability low noise high performance inhibit/sync feature An inhibit/sync pin is standard on all models of the HR700 Series converters. The pin serves as both an output inhibit and as a synchronization input. In the inhibit mode an open collector TTL compatible low (