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MHL0512DF/ES Scheda tecnica(PDF) 1 Page - Interpoint Corporation Company |
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MHL0512DF/ES Scheda tecnica(HTML) 1 Page - Interpoint Corporation Company |
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1 / 7 page  MODELS VDC OUTPUT B4-17 FEATURES • –55°C to +85°C operation • 4 to 8 VDC input • Fully isolated • Opto-coupler feedback • Fixed frequency, 210 kHz typ. • Inhibit function • Indefinite short circuit protection • Up to 80% efficiency DUAL ±12 ±15 DESCRIPTION The MHL Series™ of DC/DC converters offers either ±12 or ±15 volt outputs in a single package. MHL converters offer the high efficiency and wide input range of switching regulators with excellent load and line regulation. Input and output grounds are isolated from one another and from case ground. No external components are required for operation. The units are built using thick-film hybrid technology and are sealed in metal packages for military, aero- space, and other high-reliability applications. Unscreened models are sealed with solder and are guaranteed to pass a gross leak test (maximum leak rate of 1 x 10-3 atm.-cc/sec). Environmentally screened models (/ES) are hermetically sealed with solder and will pass a fine leak and gross leak test as described in Section C2. The MHL converters employ pulse-width modulated switching regu- lator techniques in the forward mode, with a nominal clock frequency of 210 kHz. Isolation is achieved through the use of a transformer in the forward power circuit and an opto-coupler in the feedback/control loop. The full load output power (15 watts) is avail- able over the input range of 4 to 8 VDC. Up to 14.3 watts can be obtained from a single output up to a combined load of 15 watts. The efficiency is high over the entire input voltage range and from approximately 25% of full load to full load. This feature makes the converters ideal for either battery or aircraft power applications. An inhibit function is provided to allow power shut-down and start- up from a logic input. An open circuit on the inhibit terminal produces normal operation, and a low level disables the converter. Input current in the inhibit mode is typically 20 mA. The converter features a “soft-start” function which provides a controlled 20 millisecond turn-on upon application of input power or inhibit release. An input filter is incorporated in the unit to reduce input reflected ripple current. Both outputs are indefinitely protected against short circuits to ground or to one another by automatic current limiting circuitry. This feature adjusts the converter’s output current, indefi- nitely maintaining it below approximately 125% of the rated maximum during a full short circuit condition. The MHL Series of converters is rated to operate at full load at a case temperature of 85°C, with the output power derated linearly to zero at 115°C (0.5W/°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 mate- rial (PCB, copper sheet, heat sink, or Interpoint’s TMP accessory) should be brought into contact with the converter’s baseplate. When the MHL is used in applications requiring full-power operation for extended periods of time, or in shock and vibration environ- ments, it is highly recommended that the flange-mount case option be used. This option provides improved thermal transfer capabilities as well as mechanically secure mounting configuration. DC/DC CONVERTERS 5 VOLT INPUT MHL SERIES 15 WATT Size (max.): Non-flanged, case F4 1.950 x 1.350 x 0.505 inches (49.53 x 34.29 x 12.83 mm) Flanged, case J5 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm) See Section B8, cases F4 and J5, for dimensions. Weight: 57 grams typical Screening: Standard or ES. See Section C2 for screening options, see Section A5 for ordering information. FIGURE 1 MHL0515D Efficiency 2 OUTPUT POWER (WATTS) 70 72 74 76 78 80 82 84 4 6 8 10 12 14 16 18 V IN=8 V V IN =4 V V IN=5 V Typical Performance Curve |
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