Power Electronics

PoE Supply Produces 657 W in 1U Package

From Emerson Network Power comes Astec Power’s DS657 ac-dc source for Power-over-Ethernet (PoE) applications. Featuring IEEE 802.3af compliance, the slim 1U device supplies 657 W of power at 48/51 Vdc for endspan and midspan PoE implementations along with an isolated 12 V for a distributed power source. Universal input of 85 Vac to 264 Vac at 47 Hz to 63 Hz gives the new model flexibility to address the requirements of a range of new VoIP phones and other active-Ethernet devices on a worldwide basis.

“With the increasing popularity of IP telephony and remote access devices that use inline power, the marketplace has been looking for a robust PoE solution,” explained Astec Power Product Marketing Director Chris Jones. “With the Astec DS657, we have an answer that can meet a variety of large and medium-scale 802.3af requirements for endspan and midspan power while offering 2250 V of dc isolation, EN601000-3-2 harmonic compliance, EMI filtering and active power factor correction. The hot-swap capability, 20-ms minimum holdup time and demonstrated MTBF in excess of 500,000 hours are especially desirable for critical installations.”

In addition to the 48-Vdc and 12-Vdc nominal outputs, the Astec DS657 unit includes a 0.5-A 12-Vdc standby output. The compact, ball-bearing fan-cooled 1U device operates from 0°C to 50°C and also can be mounted vertically for zero-U installation. In addition, it features active current sharing and fan-speed control, as well as overcurrent, overvoltage and overtemperature protection. A standard IEC320 inlet provides ac input power, while three LEDs indicate ac power in, dc power out and temperature status. I²C communications enable full logic control, via the blind-mate hot plug connector, for additional customization and functionality.

Samples are available now with prices starting at $240 in OEM quantities.

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