Brand New Interpoint Dc To Dc Converter & Switching Regulator Module #mhe2815s

US $37

Portland, Oregon, United States
Jun 6th

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Brand New Interpoint DC to DC Converter & Switching Regulator Module #MHE2815S. Parts are brand new and have never been used. Surplus from a project. Features • –55°C to +85°C operation • 17 to 40 VDC input typical • 50 V for 50 ms transient protection in 28 Vin models • Fully isolated • Fixed frequency switching • Output trim on single output models • Inhibit function • Indefinite short circuit protection • Up to 83% efficiency The MHE Series™ DC/DC converters offer the high efficiencies associated with switching regulators, yet have full isolation and the excellent regulation typical of linear regulators. No external components are required for operation. MHE Series converters are built using thick-film hybrid technology, and are sealed in metal packages for military, aerospace, and other high-reliability applications. Unscreened models are solder sealed and are guaranteed to pass a gross leak test (maximum leak rate of 1 x 10-3 atm.-cc/sec). Environmentally screened models are hermetically sealed and are screened to “ES” standards. The MHE Series converters are pulse-width modulated switching regulators operating in the forward mode, with a nominal switching frequency of 125 to 140 kHz. Isolation is achieved through the use of a transformer in the forward power circuit, and an optocoupler is used in the feedback/control loop. The full load output power is available over the full input voltage range. Short-term transients of 50 volts will not impair normal operation. The efficiency is typically greater than 80% over the entire input voltage range and from approximately 25% of full load to full load. This feature makes the MHE Series converters ideal for either battery or aircraft power applications. An inhibit function is provided on MHE Series converters to allow power shutdown and startup from a logic input. The unit is inhibited when the inhibit input pin (pin 2) is connected to the input common (pin 10). The open circuit voltage of the inhibit pin is 11 to 13 VDC. During inhibit, the input inhibit pin must sink approximately 1 mA. In the inhibit mode, converter output drops to less than 1 V and the input current is typically 8 mA. Automatic current limiting circuitry protects the MHE Series converters against short circuits. MHE Series converters are rated to operate at full load up to a case temperature of 85°C, with the output power derated linearly to zero at 115°C. Because of the unit’s high efficiency, heat sinking requirements are minimized, but due consideration should be given to removing self-generated heat when operating the device at maximum ratings. To increase dissipation, heat conducting material (PCB, copper sheet, heat sink, etc.) should be brought into contact with the converter’s baseplate. When the MHE Series converters are used in applications requiring full power operation for extended periods of time, or in shock and vibration environments, it is highly recommended that the flange-mount option be used. This option provides improved thermal transfer capabilities as well as a mechanically secure mounting configuration.