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Bourns, Inc. has introduced its Model PLN0xx-ED21 Series planar transformers for high-frequency and compact power conversion application requirements. These forward converter transformers are designed to deliver high volumetric power density, low loss and high-efficiency in a compact, low-height profile design.

Planar transformers increase design flexibility and offer efficiency and power density advantages over conventional wirewound transformer designs thanks to their significantly reduced AC resistance losses, Bourns said. This new series also offers greater reliability due to their enhanced thermal conduction and heat dissipation properties, added the company.

(Source: Bourns)

The Model PLN0xx-ED21 Series planar transformers provide from 48 watts up to 70 watts of output power in applications with input voltages ranging from 33 to 57 VDC and a switching frequency of 250 kHz. They also exhibit a low leakage inductance from 0.29 μH to 0.60 μH and a volt-second time of 81.6 (V-µsec).

Key specs include a 33-V to 57-V input voltage, 5-V to 12-V output voltage at 4-A to 14-A output with various turns ratios. These features and their small design make the PLN0xx-ED21 planar transformers suited for power conversion solutions for high-density industrial power systems, low-profile switched-mode power supplies (SMPS), LED lighting applications, battery management systems (BMS) and power-over-Ethernet (PoE) applications.

The planar transformers use standard PWB material for the transformer windings, soldered to an SMT header. They are RoHS compliant.

The Model PLN0xx-ED21 Series is available now. Modification and customization requests are available through Bourns’ custom magnetics product engineers.

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