Transformers are compatible with TI Fly-Buck converters.

Press Release Summary:

Designed to complement Texas Instruments LM5017 Fly-Buck™ converters, transformers in Fly-Buck series feature topology and electrical characteristics which facilitate and accelerate implementation of Fly-Buck circuit for 2 or 4 isolated outputs. Devices feature 1,500 Vrms isolation, while leakage inductance and inter-winding capacitance promote overall power conversion efficiency. All configurations handle 15–40 Vac inputs and frequencies up to 600 kHz.

Original Press Release:

Premier Magnetics' Transformers Designed for TI's Fly-Buck(TM) Converters

Transformer topology and electrical characteristics are configured specifically for use with Texas Instruments' Fly-Buck isolated synchronous buck converters

LAKE FOREST, Calif. – Premier Magnetics, global producer of high-quality magnetic components, has introduced a line of transformers specifically designed to complement the Texas Instruments LM5017 family of Fly-Buck™ converters. The Premier Magnetics Fly-Buck transformers' topology and electrical characteristics are designed to provide fast and simple implementation of the Fly-Buck circuit for two or four isolated outputs. The devices feature 1500 Vrms isolation and their low-leakage inductance and low inter-winding capacitance contribute to improved overall power conversion efficiency. For example, the TI LM5017 demo board utilizing a Premier Magnetics TSD-3425 transformer has a demonstrated efficiency of greater than 90%.

Expanding Premier's popular TSD Series, the models in the Fly-Buck series are offered to support three popular Fly-Buck circuit configurations. All handle 15-40 Vac inputs and frequencies up to 600 kHz.  The Model TSD-3424, in an EP13 package, provides quad outputs (2x +5@100 mA / 2x +15@50 mA); the dual output TSD-3425 (+5@250 mA / +5@250 mA) and TSD-3426 (+5@150 mA / +5@150 mA) are each in a smaller EP10 package.

"The new line of Fly-Buck transformers is another example of Premier Magnetics' commitment to providing well-engineered magnetics solutions to the power electronics design community," said Jim Earley, president of Premier Magnetics. "Our goal is to simplify switching power supply optimization by providing our customers with reference designs and recommended filters and power inductors to complete the task."

Price: $0.48 - $0.52 in OEM quantities

Availability: Samples in stock for immediate delivery

Delivery: 8 weeks, ARO for OEM quantities

About Premier Magnetics

Incorporated in 1991, Premier Magnetics ( is a leading, multinational company producing and marketing a broad range of magnetics components, including telecom magnetics, power conversion magnetics and DC/DC converters. Committed to providing the highest quality products and shortest cycle times at the most competitive cost in the industry, Premier provides products to the communications, computer, industrial and medical industries, as well as various government and military agencies around the world. Sales and distribution offices are worldwide, with manufacturing locations in Southern California, Taiwan and China.

For Further Information, Editors Contact:

Dennis Earley, Sales Manager

Premier Magnetics

20381 Barents Sea Circle

Lake Forest, CA 92630

(949) 452-0511 -- Fax: (949) 452-0512


Greg Evans, CEO

WelComm, Inc.

7975 Raytheon Rd, Ste 340

San Diego, CA 92111

(858) 633-1911


Web Site:

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