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HR301-285 Datasheet(PDF) 1 Page - Crane Aerospace & Electronics. |
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HR301-285 Datasheet(HTML) 1 Page - Crane Aerospace & Electronics. |
1 / 7 page ![]() MODELS VDC OUTPUT B4-39 Size (max.): 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm) See Section B8, case J5, for dimensions. Weight: 60 grams max. Screening: Standard only. See Section C2 for screening description. FEATURES • –40° to +85°C operation • 18 to 36 VDC input (19 to 36 VDC input HR301-2805) • Fully Isolated • Optocoupler feedback • Fixed frequency, 240 to 300 kHz typical • Topology – Push-Pull Forward • 50 V for up to 50 ms transient protection • Inhibit function • Indefinite short circuit protection • Remote sense on HR301-2805 model • Up to 86% efficiency SINGLE 5 12 15 DUAL ±12 ±15 DESCRIPTION HR300 Series™ DC/DC 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. SMALL SIZE AND RELIABILITY HR300 DC/DC converters use thick-film hybrid manufacturing tech- niques for smaller size, lighter weight and higher reliability than converters produced with other circuit techniques. With a footprint of less than 3.7 square inches and a 0.5 inch height, the HR300 converters reach power densities up to 22 watts per cubic inch. The HR300 parts use the same manufacturing procedures and quality controls that Interpoint applies to converters built for aero- space and military applications. The converters are hermetically sealed in metal packages that are guaranteed a maximum leak rate of less than 10-3 atm-cc/sec. HIGH PERFORMANCE HR300 converters use a constant frequency pulse-width modulated switching regulator design operating in the forward mode with a clock switching frequency of 240 to 300 kHz. Isolation is achieved through the use of a transformer in the forward power circuit and an optocoupler in the feedback control loop. The full load output power of 30 watts is available over the entire 18 to 36 VDC input range (19 to 36 HR301-2805). On dual output models, up to 90% of full power is available from either output up to a combined total of 30 watts. The HR300’s high efficiency is maintained over the entire input voltage range and from approximately 25% of full load to full load (see typical efficiency curves). Short circuit protection is provided through foldback current limiting. When the output current reaches approximately 125% of the full rated load, the output voltage begins to reduce to protect the converter. The converter can sustain a true short circuit condition indefinitely. The HR300’s flanged case facilitates removal of heat and provides for mechanically secure mounting. If full power opera- tion or indefinite short circuit protection is a system requirement, the HR300 converter should be mounted with an efficient heat sink in contact with the mounting flange. Internal filters in all HR300 converters provide low noise on both the input and outputs. On HR301 models, two-section L-C filters limit output ripple voltage and reflected input ripple current. On HR302 models, single-section L-C filters perform the same function. For maximum output regulation, the HR301-2805 is provided with external output voltage remote sense pins. Connecting the remote sense pins to the load provides a four-terminal voltage mode which eliminates the adverse effects of line resistance voltage drops. Remote sense pins may be left unconnected, but see cautions in this data sheet. For normal operation, remote sense pins should be connected to the respective output pins. INHIBIT FUNCTION An inhibit is provided to allow a logic input to shut down the converter. An open circuit on the inhibit pin (pin 2 or 8) allows normal operation. A connection between the inhibit pin and the input common (pin 10) disables the internal oscillator, shutting down the output. The inhibit pin has an open circuit voltage of 11 to 16 V on single output models, 8 to 12 V on HR302-2812 and 10 to 14 V on HR302-2815. In the inhibit mode, approximately 1 mA must be sunk from the inhibit pin. An active low open collector is required to acti- vate the inhibit function. DC/DC CONVERTERS 28 VOLT INPUT HR300 SERIES 30 WATT |
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