MINNEAPOLIS Artesyn Technologies' NXA66 series of 66-watt, nonisolated dc/dc converters provides point-of-load power conversion and fast transient response in a vertically mounted, space-efficient package.
The NXA66 is available initially with a 12-volt input and a selectable 3.3-V or 2.5-V output at 20-A continuous current. Tailored for workstations, file servers, desktop computers, networking equipment and other high-performance applications, the NXA66 (shown at right) costs $24 each in quantities of 5,000.
In a separate announcement, Artesyn also released its CXA20, in five models. The latest additions to the company's CXA family of open-frame isolated converters extend the series to 20 W.
The NXA66 dc/dc converter competes head-to-head against the Titania units from Lucent Technologies, which offer a variable 1.3- to 3.5-Vdc output at a maximum output current of 20 A. "We developed this product NXA66 to provide Titania-grade performance," said Marshall Miles, strategic marketing director at Artesyn.
The NXA66 measures 2.75 x 1.375 x 0.588 inches, against 2.76 x 1.78 x 0.37 inches for Titania. The Artesyn converter's gold-plated edge tabs offer a convenient, low-impedance interconnect scheme that accommodates future expansion.
The NXA66's stated transient response (zero to full-load) is 30 A/microsecond, vs. 50 A/microseconds for the Titania, and it recovers in less than 100 microseconds. By using synchronous rectification, the NXA66 achieves 86 percent efficiency for a 3.3-V output, according to the company (the Titania achieves 83 percent for a 12-V input and output of 2 V at 16 A).
The Artesyn converter can be used in a standalone configuration, or paralleled as a building block to achieve higher output currents. A so-called "democratic" current-sharing scheme eliminates the need for cumbersome master/slave combinations. The NXA66 also offers overvoltage protection with an on-board fuse, double-ended differential remote sensing and short-circuit protection.
Simulations of the NXA66 can be run in Artesyn's Virtual PowerLab using a Web browser. "We're bringing up the simulation software more quickly, more in line with each new product introduction," said Miles. SimScope, the Web-based simulation tool found in PowerLab, allows designers to select a virtual NXA66, configure it to their applications, run simulations and then view voltage and current waveforms at any point in their applications. Simulations can be used to determine actual transient response within a particular application. SimScope also generates Bode plots to verify stable operation (see www.artesyn.com/powerlab).
The NXA66 comes with full international safety approval, including EN60950 and cUL1950. It provides full output current to 40 degrees C with 300 LFM of airflow. Output current is derated with higher ambient temperatures or with less airflow. The NXA66 is available now, with a 10-week lead time for production orders.
The company's new CXA20 isolated converter features a 4:1 input voltage range of 18 to 75 Vdc, suiting it for a variety of communications and distributed-power applications.
With its 2 x 1.6-inch industry-standard footprint, the CXA20 provides an easy upgrade option for customers seeking improved performance at a better price, Artesyn said. The part comes in output voltages of 3.3, 5, 12, plus/minus 5 and plus/minus 12 V. The 3.3-V version delivers up to 6 A and is fully rated to 20 W. Typical efficiency is 83 percent.
The supply offers remote on/off, as well as overvoltage and short-circuit protection. With full international safety approval including EN60950 and cUL1950, the CXA20 reduces system compliance costs and time-to-market. It provides basic isolation and can operate convection-cooled at ambient temperatures between 40 degrees and 60 degrees C, and up to 100 degrees C with forced-air or output derating.
Samples can be delivered now from stock, with eight-week lead times for production orders. In lots of 100, the CXA20 sells for $43.75 each.
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EETInfo No. 614