12V Front-End Distributed Power Supply

Emerson Network Power (Carlsbad, CA) has introduced the DS2900, a high-wattage 12V front-end distributed power supply. The Emerson DS2900 is rated for up to 2900W of adjustable output power at 240A. In addition to 12 VDC output, it offers 3.3 VDC auxiliary output for powering standby circuitry, and an optional alternative 5.5 VDC auxiliary output. The compact 2U × 3U form factor offers system-level power density of more than 24W per cubic inch. It offers typical operating efficiency of approximately 91 percent at 50 percent load. The power supply’s shorter form factor also allows mid-plane rack configurations, while same-side AC inputs and DC outputs allow hot-plug rack configuration.

The power supply accepts a wide input voltage range of 180 VAC to 264 VAC with no minimum load requirement and is equipped with active Power Factor Correction (PFC) rated at 0.99 typical to minimize input harmonic current distortion. It also features active AC inrush controls, limiting inrush current at power-on to 55A. The 40mm × 28mm variable-speed “smart” fan enhances energy efficiency and reliability. The DS2900 operates in a temperature range of zero to 50°Celsius, and when used at normal operating conditions (25°Celsius ambient at full load) it offers a demonstrated mean time between failures (MTBF) of more than 500,000 hours.

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