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Pulse planar transformer targets industrial apps

Posted: 20 Dec 2002 ?? ?Print Version ?Bookmark and Share

Keywords:pulse engineering? pa0369? pa0423? power transformer? planar transformer?

Pulse Engineering Inc. touts its PA0369 and PA0423 as the only component-type planar transformers with a 100W to 140W rating available as a standard catalog item.

These first two transformers in the series, optimized for 200kHz to 500kHz dc/dc converter ICs used in telecom, datacom, and industrial control applications, are designed for active-clamp forward-converter topologies that provide 3.3V at 30A (PA0369) or 12V at 11.6A (PA0423) from a 35V to 75V input.

The PA0369 has single primary (six turns) and secondary (one turn) windings, and is basically intended for use with Texas Instruments Inc.'s UCC-3580 dc/dc chip. The PA0423 has a primary (eight turns) and line-side auxiliary winding (four turns), and a single secondary winding (four turns). It is suited for use with Linear Technology's LT1725.

Other versions are available for applications at 5V at 20A, and 26V at 4A, and there are transformers for full-bridge, half-bridge, and push-pull topologies as well. Designed for use in very high-density applications, these transformers feature low leakage inductance (generally <0.4?H) and provide a primary-secondary isolation of 1.5kVdc. Their surface-mount package is said to be compatible with all contemporary pick-and-place processes.

The transformers are rated for operation over -40C to 125C. They are priced starting at $2.85 each for the PA0369, and $3.15 for the PA0423, both in quantities of 100,000. Lead time is four to six weeks. Volume discounts are available. For more information, refer to the company's Web site and data sheets P569 and P571.

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