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MCH285R2S bảng dữ liệu(PDF) 1 Page - Interpoint Corporation Company |
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MCH285R2S bảng dữ liệu(HTML) 1 Page - Interpoint Corporation Company |
1 / 8 page 1 + POSITIVE INPUT INHIBIT FB SHUTDOWN PWM CONTROLLER INPUT COMMON +VIN +VOUT + + DUAL MODELS ONLY NEGATIVE OUTPUT OUTPUT COMMON POSITIVE OUTPUT 3 4 6 1 7 2 0.47 µF typical MCH SERIES 1.5 WATT FEATURES • -55°C to +125°C operation • 12 to 50 VDC input • Fully isolated • Magnetic feedback • Fixed frequency 370 kHz typ. • Topology – Current Mode Flyback • 80 V for up to 120 ms transient protection (70 V for 15 V single and dual models) • Inhibit function • Short circuit protection • Undervoltage lockout MODELS VDC OUTPUT DESCRIPTION With a miniature footprint of just 0.8 square inches, the MCH Series™ of DC/DC converters delivers 1.5 watts of output power while saving significant board real estate. The wide input voltage range of 12 to 50 VDC accepts the varying voltages of military, aero- space, or space bus power and tightly regulates output voltages to protect downstream components. Transient protection of 80 volts for up to 120 milliseconds exceeds the requirements of MIL-STD-704A for the 5, 5.2, and 12 volt single models and the 12 volt dual model. The 15 volt single and dual converters will withstand transients of up to 70 volts for up to 120 milliseconds. CONVERTER DESIGN MCH Series DC/DC converters incorporate a continuous flyback topology with a constant switching frequency of approximately 370 kHz. Current-mode pulse width modulation (PWM) provides output voltage regulation. Output error voltage is magnetically fed back to the input side of the PWM to regulate output voltage. Regulation is also affected by the load; refer to the Electrical Characteristics tables on the following pages. Dual models regulate the negative output with magnetic coupling to the positive output. Up to 80% of the total load may be on one output providing that the other output carries a minimum of 20% of the total load. The dual models can be used at double the output voltage by connecting the load between positive and negative outputs, leaving the common unconnected. (ex: MCH2805D can be used as a 10 VDC output.) INHIBIT FUNCTION When an open collector TTL logic low is applied to the inhibit terminal, pin 7, the converter shuts down and lowers the output voltage to near zero and input current to as low as 2.3 mA. Leaving the terminal open or applying an open collector TTL logic high will enable the converter. PROTECTION FEATURES Undervoltage lockout prevents the MCH Series converters from operating below approximately 8 VDC input voltage to keep system current levels smooth, especially during initialization or re-start oper- ations. All models include a soft-start function to prevent large current draw and minimize overshoot. The converters also provide short circuit protection by restricting the current. MIL-STD-461 Use Interpoint’s FMSA-461 EMI filter to pass the CE03 requirements of MIL-STD-461C. CONVENIENT PACKAGING The MCH Series converters are packaged in hermetically sealed, projection-welded metal cases which provide EMI/RFI shielding. SINGLES 5 5.2 12 15 DUALS ±5 ±12 ±15 DC/DC CONVERTERS 28 VOLT INPUT FIGURE 1: BLOCK DIAGRAM Size (max.): 0.980 x 0.805 x 0.270 inches (24.89 x 20.45 x 6.86 mm) Weight: 12 grams max. Screening: Standard, ES, or 883 (Class H) |
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