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Zakładka z wyszukiwarką danych komponentów |
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MSA2805S/883 Arkusz danych(PDF) 1 Page - Interpoint Corporation Company |
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MSA2805S/883 Arkusz danych(HTML) 1 Page - Interpoint Corporation Company |
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1 / 8 page  MODELS VDC OUTPUT 1 Size (max.): 1.075 x 1.075 x 0.270 inches (27.31 x 27.31 x 6.86 mm) Weight: 15 grams maximum. Screening: Standard, ES, or 883 (Class H). SINGLE 5 5.2 12 15 60 DUAL ±5 ±12 ±15 DESCRIPTION The MSA Series™ of high frequency DC/DC converters offers a new standard of performance for low power, military/aerospace grade DC/DC converters. MSA parts provide up to 5 watts output power over the full military temperature range with up to 76% efficiency. Thick-film hybrid techniques provide military/aerospace reliability levels and optimum miniaturization. The hermetically sealed case is only 1.075 by 1.075 inches — with a height of only 0.270 inches. Power density for the MSA Series parts is 16 watts per cubic inch. The MSA Series’ small size, low height, and hermetically sealed metal enclosures make them ideal for use in military, aerospace and other high reliability applications. Units are available with standard, screening, “ES”, and fully compliant SMD “883” screening. See page 8 for screening options and descriptions. CONVERTER DESIGN The MSA converters are switching regulators that use a flyback converter design with a constant switching frequency of 550 kHz. They are regulated, isolated units using a pulse width modulated topology and built as high reliability thick-film hybrids. Isolation between input and output circuits is provided with a transformer in the forward power path and an optical link in the feedback control loop. Excellent input line transient response and audio rejection is achieved by an advanced feed-forward compensation technique. Negative output regulation is maintained by tightly coupled magnetics. Up to 4 watts, 80% of the total output power, is available from either output, provided that the opposite output is simultane- ously carrying 20% of the total power. Each output must carry a minimum of 20% of the total output power in order to maintain spec- ified regulation on the negative output. Predictable current limit is accomplished by direct monitoring of the output load current, which results in a constant current output above the overload point. Internal input and output filters eliminate the need for external capacitors. WIDE VOLTAGE RANGE The MSA converters are designed to provide full power operation over a full 16 to 40 VDC voltage range. Operation below 16 volts, including MIL-STD-704E emergency power conditions is possible with derated power. Please refer to the low line dropout graphs (Figures 17 and 18) for details. A low voltage lockout feature keeps the converter shutdown below approximately 13 VDC to ensure smooth initialization. IMPROVED DYNAMIC RESPONSE The MSA feed-forward compensation system provides excellent dynamic response and noise rejection. Audio rejection is typically 50 dB. The minimum to maximum step line transient response is typi- cally less than 1%. INHIBIT FUNCTION MSA converters provide a TTL open collector-compatible inhibit feature that can be used to disable internal switching and inhibit the unit’s output. Inhibiting in this manner results in low standby current, and no generation of switching noise. The converter is inhibited when the TTL compatible low ( ≤0.8 V) is applied to the inhibit pin. 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 9 to 11 V. In the inhibit mode, a maximum of 4 mA must be sunk from the inhibit pin. UNDERVOLTAGE LOCKOUT AND TRANSIENT PROTECTION Undervoltage lockout helps keep system current levels low during initialization or re-start operations. They can withstand short term transients of up to 50 volts without damage. DC/DC CONVERTERS 28 VOLT INPUT MSA SERIES 5 WATT FEATURES • –55° to +125°C operation • 16 to 40 VDC input • Fully isolated • Optocoupler feedback • Fixed frequency, 550 kHz typical (400 kHz typ. 60 V output model) • Topology – Flyback • 50 V for up to 50 ms transient protection • Inhibit function • Indefinite short circuit protection • Up to 76% efficiency, 16 W/in3 |
Podobny numer części - MSA2805S/883 |
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Podobny opis - MSA2805S/883 |
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