Premier Magnetics Adds Line of Frequency-Optimized Planar Transformers

Premier Magnetics has introduced a new line of frequency-optimized planar transformers optimized for 200-700 KHz switching applications. The PM-PTxxx Series offers models with ratings to 250W that are designed for forward converter, full/half bridge and active clamp applications utilizing switching frequencies between 200 KHz and 700 KHz. 

Proprietary layout techniques for the circuit board windings result in optimization of transformer impedance and interwinding capacitance effects in the desired operating frequency range, according to Dennis Earley, general manager, who provided this overview of them at APEC. 

The PT Series devices all provide excellent isolation, up to 2250 VDC, and operate over a wide temperature range, from -40C to +125C. They demonstrate excellent efficiency, up to 99%, and provide exceptional heat dissipation due to their planar construction compared to classic wire-wound transformers. 

“Customer demand was the driving force in the development of these planar transformers,” said Earley.

“Our designs are optimized to meet their requirements for higher power density, higher-efficiency power conversion in switch mode power supplies and in electric vehicle, industrial, aerospace and solar applications. The addition of planar transformers fills a market void and makes the PM Power Product line one of the most complete in the industry,” The units are priced from $1.60 to $3.25 in OEM quantities.

Premier Magnetics headquarters

Based in Lake Forest, CA, Premier designs and manufactures a broad range of magnetics components including power conversion magnetics, data bus transformers, and LAN magnetics serving the aerospace, computer, industrial, and medical industries, as well as various government and military agencies. The company has sales and distribution offices worldwide, with manufacturing locations in Southern California, Taiwan and China. For more info, see