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MHF2812S/883 Scheda tecnica(PDF) 1 Page - Interpoint Corporation Company |
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MHF2812S/883 Scheda tecnica(HTML) 1 Page - Interpoint Corporation Company |
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1 / 23 page  DESCRIPTION MHF+ SerieS™ SingleS and dualS interpoint® MHF+ Series singles and duals are high frequency dc-dc converters offering a wide input voltage range of 16 to 40 volts (MHF+281r9S, 20 to 32 volts) and up to 15 watts of output power. Transient protection up to 50 volts for up to 50 ms. The converters are offered with standard screening, “eS” screening, or fully compliant to “883” Mil-PrF-38534 Class H screening (see Table 13 on page 23). Standard Microcircuit drawings (SMd) are available (see Table 3 on page 7. Converter Design The MHF+ Series single and dual converters are switching regulators that use a quasi-square wave, single-ended forward converter design with a constant switching frequency of 550 kHz typical. isolation between input and output circuits is provided with a transformer in the forward path and a temperature compensated optical link in the feedback control loop. See Figure 1 and Figure 3 on page 4 For the MHF+ dual output models, good cross regulation is maintained by tightly coupled output magnetics. up to 90% of the total output power (80% on 2805d) is available from either output, providing the opposite output is simultaneously carrying 10% of the total output power (20% on 2805d models). Predictable current limit is accomplished by directly monitoring the output load current and providing a constant current output above the overload point. inhibit FunCtion MHF+ converters provide an inhibit terminal that can be used to disable internal switching, resulting in no output current and very low quiescent input current. The converter is inhibited when the inhibit pin is pulled low (≤0.8 V = output disabled). The unit is enabled when the pin, which is internally connected to a pull-up resistor, is left unconnected or is connected to an open- collector gate. The open circuit output voltage associated with the inhibit pin is 8.5 to 12 V. In the inhibit mode, a maximum of 5 mA must be sunk from the inhibit pin. See Figure 6 on page 5 synChronization An external synchronization feature is included that allows the user to adjust the nominally 550 kHz operating frequency to any frequency within the range of 500 kHz to 600 kHz. This is initiated by applying a signal input of the desired frequency to pin 5. The capacitively coupled sync input will synchronize on a differential signal of as low as 4 volts to as high as 5 V. For single and dual output models, if the sync function is not used, connect the terminal to input common. short CirCuit ProteCtion MHF+ Series single and dual output converters provide short circuit protection by restricting the output current to approximately 115% of the full load output current. The output current is sensed in the secondary stage to provide highly predictable and accurate current limiting, and to eliminate foldback characteristics. unDervoltage loCkout undervoltage lockout prevents the single and dual output converters from operating below approximately 14 Volts input voltage to keep system current levels smooth, especially during initialization or re-start operations. PaCkaging MHF+ Series of converters are packaged in hermetically sealed metal cases and can be purchased in a flanged or non-flanged case. The flanged option provides increased heat dissipation and also provides greater stability when mechanically secured. FEaTuRES Only 0.33 inches (8.38 mm) high in a hermetically sealed case • Operating temperature –55° to +125°C • Input voltage 16 to 40 Volts - MHF+281R9S 20 to 32 Volts - Triple output models 16 to 48 Volts • Transient protection - Single and dual: 50 V for 50 ms - MHF+281R9S: 35 V for 50 ms - Triple: 80 V for 120 ms • Fully isolated • Fixed high frequency switching • inhibit and synchronization functions • indefinite short circuit protection • under voltage lockout mODElS Output VOltage (V) Single dual TriPle 1.9 ±5 +5 & ±12 3.3 ±12 +5 & ±15 5 ±15 5.2 5.3 12 15 28 Crane Aerospace & Electronics Power Solutions mHF+ Single, Dual and Triple DC-DC Converters Crane Aerospace & Electronics Power Solutions - Interpoint Products 10301 Willows Road NE, Redmond, WA, 98052 +1.425.882.3100 • power@crane-eg.com www.craneae.com/interpoint Page 1 of 23 28 VOlT INPuT – 15 WaTT MHF+ rev aB - 2014.10.02 |
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